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Tang Q, Liu C, Lv D, Zhao L, Jiang L, Wang J. Biotemplated Fe/La-co-doped TiO 2 for photocatalytic depth treatment of compressed leachate from refuse transfer station. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:40941-40957. [PMID: 38837031 DOI: 10.1007/s11356-024-33870-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 05/27/2024] [Indexed: 06/06/2024]
Abstract
Compressed leachate is a contaminated liquid containing various organic and inorganic pollutants produced in municipal refuse transfer stations, which pollute soil and groundwater, posing serious risks to the environment and human health. The Environmental Technology Co., Ltd. (Shenzhen, Guangdong Province, South China) treated compressed leachate obtained from a refuse transfer station. The chemical oxygen demand (COD) (641.2 mg/L) of treated compressed leachate did not meet the wastewater quality standards in China for discharge into municipal sewers (COD ≤ 500 mg/L) and the company's design discharge requirements (COD ≤ 400 mg/L). Therefore, their further in-depth treatment is necessary. To this end, waste tobacco leaves were used as the biotemplate herein, and Fe/La-co-doped TiO2 (xFe,yLa)-TTiO2(g) was synthesized using a solvothermal-assisted biotemplating method. The photocatalytic depth treatment of compressed leachate was performed under simulated solar light using the prepared catalysts. After (3Fe,3La)-TTiO2(g) treatment, the COD of the leachate decreased from 641.2 to 280.1 mg/L, and the COD removal rate was 1.2, 1.1, and 1.6 times higher than that of pure Fe-doped, La-doped and non-biological template TiO2, respectively. Characterization confirmed that the biological template endowed the catalyst with a unique morphology and high specific surface area. Its rich activity sites are conducive to enhancing the adsorption capacity of pollutants and providing an ideal place for photocatalytic reactions. Co-doping with iron and lanthanum ions altered the band structure of TiO2 and promoted the interconversion of Fe3+/Fe2+ and La3+/La2+ during photocatalysis. First-principles density functional theory simulations demonstrated that co-doping Fe and La in TiO2 created impurity levels that facilitated the transfer of photogenerated electrons. This study provides a new purification pathway for the depth treatment of compressed leachate.
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Affiliation(s)
- Qinyuan Tang
- School of Chemical Sciences and Engineering, Yunnan Province Engineering Research Center of Photocatalytic Treatment of Industrial Wastewater, Yunnan University, Kunming, 650091, People's Republic of China
| | - Chang Liu
- School of Chemical Sciences and Engineering, Yunnan Province Engineering Research Center of Photocatalytic Treatment of Industrial Wastewater, Yunnan University, Kunming, 650091, People's Republic of China
| | - Die Lv
- School of Chemical Sciences and Engineering, Yunnan Province Engineering Research Center of Photocatalytic Treatment of Industrial Wastewater, Yunnan University, Kunming, 650091, People's Republic of China
| | - Lixia Zhao
- School of Chemical Sciences and Engineering, Yunnan Province Engineering Research Center of Photocatalytic Treatment of Industrial Wastewater, Yunnan University, Kunming, 650091, People's Republic of China
| | - Liang Jiang
- School of Engineering, Yunnan University, Kunming, 650091, People's Republic of China
| | - Jiaqiang Wang
- School of Chemical Sciences and Engineering, Yunnan Province Engineering Research Center of Photocatalytic Treatment of Industrial Wastewater, Yunnan University, Kunming, 650091, People's Republic of China.
- School of Materials and Energy, Yunnan University, Kunming, 650091, People's Republic of China.
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Kouao DS, Grochowska K, Stranak V, Sezemsky P, Gumieniak J, Kramek A, Karczewski J, Coy E, Hanus J, Kylian O, Sawczak M, Siuzdak K. Laser-Treated MXene as an Electrochemical Agent to Boost Properties of Semitransparent Photoelectrode Based on Titania Nanotubes. ACS NANO 2024; 18:10165-10183. [PMID: 38533789 DOI: 10.1021/acsnano.4c00092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
In this study, Ti3C2Tx underwent laser treatment to reshape it, resulting in the formation of a TiO2/Ti3C2Tx heterojunction. The interaction with laser light induced the formation of spherical TiO2 composed of an anatase-rutile phase on the Ti3C2Tx surface. Such a heterostructure was loaded over a titania nanotube (TNT) layer, and the surface area was enhanced through immersion in a TiCl4 solution followed by thermal treatment. Consequently, the photon-to-electron conversion efficiency exhibits a 10-fold increase as compared to bare TNT. Moreover, for the sample produced with optimized conditions, five times higher photoactivity is observed in comparison to bare TNT. It was shown that under visible light irradiation the most photoactive heterojunction based on the tubular layer reveals a substantial drop in the charge transfer resistance of about 32% with respect to the dark condition. This can be attributed to the narrower band gaps of the modified material and improvement of the separation efficiency of the photogenerated electron-hole pairs. Overall results suggest that this investigation underscores TiO2/Ti3C2Tx as a promising noble-metal-free material that enhances both the electrochemical and photoelectrochemical performances of electrode materials based on TNT that can be further used in light-harvesting applications.
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Affiliation(s)
- Dujearic-Stephane Kouao
- Centre for Plasma and Laser Engineering, Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14 St., 80-231 Gdańsk, Poland
| | - Katarzyna Grochowska
- Centre for Plasma and Laser Engineering, Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14 St., 80-231 Gdańsk, Poland
| | - Vitezslav Stranak
- Faculty of Science, University of South Bohemia, Branišovská 1760, 37005 České Budejovice, Czech Republic
| | - Petr Sezemsky
- Faculty of Science, University of South Bohemia, Branišovská 1760, 37005 České Budejovice, Czech Republic
| | - Justyna Gumieniak
- The Faculty of Mechanics and Technology, Rzeszów University of Technology, Kwiatkowskiego 4 St., 37-450 Stalowa Wola, Poland
| | - Agnieszka Kramek
- The Faculty of Mechanics and Technology, Rzeszów University of Technology, Kwiatkowskiego 4 St., 37-450 Stalowa Wola, Poland
| | - Jakub Karczewski
- Faculty of Applied Physics and Mathematics, Institute of Nanotechnology and Materials Engineering, Gdańsk University of Technology, Narutowicza 11/12 St., 80-233 Gdańsk, Poland
| | - Emerson Coy
- NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3 St., 61-614 Poznań, Poland
| | - Jan Hanus
- Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Praha 8, Czech Republic
| | - Ondrej Kylian
- Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Praha 8, Czech Republic
| | - Mirosław Sawczak
- Centre for Plasma and Laser Engineering, Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14 St., 80-231 Gdańsk, Poland
| | - Katarzyna Siuzdak
- Centre for Plasma and Laser Engineering, Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14 St., 80-231 Gdańsk, Poland
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Yun Q, Ge Y, Shi Z, Liu J, Wang X, Zhang A, Huang B, Yao Y, Luo Q, Zhai L, Ge J, Peng Y, Gong C, Zhao M, Qin Y, Ma C, Wang G, Wa Q, Zhou X, Li Z, Li S, Zhai W, Yang H, Ren Y, Wang Y, Li L, Ruan X, Wu Y, Chen B, Lu Q, Lai Z, He Q, Huang X, Chen Y, Zhang H. Recent Progress on Phase Engineering of Nanomaterials. Chem Rev 2023. [PMID: 37962496 DOI: 10.1021/acs.chemrev.3c00459] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
As a key structural parameter, phase depicts the arrangement of atoms in materials. Normally, a nanomaterial exists in its thermodynamically stable crystal phase. With the development of nanotechnology, nanomaterials with unconventional crystal phases, which rarely exist in their bulk counterparts, or amorphous phase have been prepared using carefully controlled reaction conditions. Together these methods are beginning to enable phase engineering of nanomaterials (PEN), i.e., the synthesis of nanomaterials with unconventional phases and the transformation between different phases, to obtain desired properties and functions. This Review summarizes the research progress in the field of PEN. First, we present representative strategies for the direct synthesis of unconventional phases and modulation of phase transformation in diverse kinds of nanomaterials. We cover the synthesis of nanomaterials ranging from metal nanostructures such as Au, Ag, Cu, Pd, and Ru, and their alloys; metal oxides, borides, and carbides; to transition metal dichalcogenides (TMDs) and 2D layered materials. We review synthesis and growth methods ranging from wet-chemical reduction and seed-mediated epitaxial growth to chemical vapor deposition (CVD), high pressure phase transformation, and electron and ion-beam irradiation. After that, we summarize the significant influence of phase on the various properties of unconventional-phase nanomaterials. We also discuss the potential applications of the developed unconventional-phase nanomaterials in different areas including catalysis, electrochemical energy storage (batteries and supercapacitors), solar cells, optoelectronics, and sensing. Finally, we discuss existing challenges and future research directions in PEN.
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Affiliation(s)
- Qinbai Yun
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
- Department of Chemical and Biological Engineering & Energy Institute, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Yiyao Ge
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Zhenyu Shi
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Jiawei Liu
- Institute of Sustainability for Chemicals, Energy and Environment, Agency for Science, Technology and Research (A*STAR), Singapore, 627833, Singapore
| | - Xixi Wang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - An Zhang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Biao Huang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
- Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong, China
| | - Yao Yao
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Qinxin Luo
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Li Zhai
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
- Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong, China
| | - Jingjie Ge
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR
| | - Yongwu Peng
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Chengtao Gong
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Meiting Zhao
- Institute of Molecular Aggregation Science, Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300072, China
| | - Yutian Qin
- Institute of Molecular Aggregation Science, Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300072, China
| | - Chen Ma
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Gang Wang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Qingbo Wa
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Xichen Zhou
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Zijian Li
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Siyuan Li
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Wei Zhai
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Hua Yang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Yi Ren
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Yongji Wang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Lujing Li
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Xinyang Ruan
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Yuxuan Wu
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Bo Chen
- State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials, School of Chemistry and Life Sciences, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
| | - Qipeng Lu
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Zhuangchai Lai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Qiyuan He
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China
| | - Xiao Huang
- Institute of Advanced Materials (IAM), School of Flexible Electronics (SoFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing 211816, China
| | - Ye Chen
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Hua Zhang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
- Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong, China
- Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China
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Wanwong S, Sangkhun W, Jiamboonsri P, Butburee T. Electrospun silk nanofiber loaded with Ag-doped TiO 2 with high-reactive facet as multifunctional air filter. RSC Adv 2023; 13:25729-25737. [PMID: 37649664 PMCID: PMC10464597 DOI: 10.1039/d3ra04621d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 08/23/2023] [Indexed: 09/01/2023] Open
Abstract
Particulate matter (PM) and volatile organic compounds (VOCs) are air pollution that can cause high risk to public health. To protect individuals from air pollution exposure, fibrous filters have been widely employed. In this work, we develop silk nanofibers, which are loaded with Ag-doped TiO2 nanoparticles with exposed (001) (assigned as Ag-TiO2-silk), via electrospinning method and utilized them as multifunctional air filters that can efficiently reduce PM2.5, organic pollutants and microbials. The results showed that Ag-TiO2-silk with a loading of 1 wt% (1%Ag-TiO2-silk) exhibited the best performance among various different Ag-doped samples, as it performed the best as an air filter, which had the highest PM2.5 removal efficiency of 99.04 ± 1.70% with low pressure drop of 34.3 Pa, and also exhibited the highest photodegradation efficiency of formaldehyde. In addition, the Ag-TiO2-silk demonstrated antibacterial activity. These properties make silk composite nanofibers attractive for multifunctional and environmentally-friendly air filter application.
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Affiliation(s)
- Sompit Wanwong
- Materials Technology Program, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi 126 Pracha Uthit Road, Bang Mod Thailand
| | - Weradesh Sangkhun
- Materials Technology Program, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi 126 Pracha Uthit Road, Bang Mod Thailand
| | - Pimsumon Jiamboonsri
- Faculty of Medicine, King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand
| | - Teera Butburee
- National Nanotechnology Center, National Science and Technology Development Agency, Thailand Science Park Pathum Thani 12120 Thailand
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5
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Rajapandi P, Viruthagiri G, Shanmugam N. Influence of Ni doping on hematite nanoparticles for enhanced structural, optical, magnetic properties and antibacterial analysis. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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6
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Rong H, Jia Y, Liu WW, Kumari Cheepurupalli K, English NJ, Zhang X, Bandaru S, Zhao L. Evaluation of DFT+U and HSE Frameworks for Strongly Correlated Iron Oxide. ChemistrySelect 2023. [DOI: 10.1002/slct.202204450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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7
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El-Salamony RA, Aboutaleb WA, Dhmees AS. Photodegradation of Amido Black 10b Dye Under Visible Light Using Ni and Zn Ferrite Catalysts Prepared by a Simple Modified Sol–Gel Method. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2023. [DOI: 10.1007/s13369-023-07676-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
AbstractThe pure α-Fe2O3, NiFe2O4, and ZnFe2O4 were prepared by a simple modified sol–gel method. The prepared catalysts were characterized by X-ray diffraction, transmission electron microscope, surface area, Zeta potential and optical techniques. The ferrite structure of samples is confirmed. The photocatalytic activity was evaluated toward Amido black 10b dye degradation under visible light at different pHs of 4, 8, and 10 for 90 min irradiation time. The photodegradation toward Amido black b10 dye reached maximum value at pH 8, and it reaches 92%, 89%, and 85% over ZnFe2O4, Fe2O3, and NiFe2O4 photocatalysts; respectively. The increased photoactivity of the ZnFe2O4 sample can also be attributed to its lower bandgap of 2 eV, the formation of the −OH-surface group. Since –OH can interact with the photoexcited holes that were originally formed on the catalyst surface, hydroxyl radicals are produced that have strong oxidizing properties. Whereas; the dye photodegradation is negligible in the case of Fe2O3, and NiFe2O4 catalysts at pH 10, due to the electrostatic repulsion between negatively charged catalyst surface and dye ions at high basic medium. While, in case of ZnFe2O4, the photodegradation reached only 40%.
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Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features. Top Curr Chem (Cham) 2022; 380:51. [PMID: 36180757 PMCID: PMC9525398 DOI: 10.1007/s41061-022-00409-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 09/12/2022] [Indexed: 11/15/2022]
Abstract
Solar-powered photocatalysis has come a long way since its humble beginnings in the 1990s, producing more than a thousand research papers per year over the past decade. In this review, immobilized photocatalysts operating under sunlight are highlighted. First, a literature review of solar-driven films is presented, along with some fundamental operational differences in relation to reactions involving suspended nanoparticles. Common strategies for achieving sunlight activity from films are then described, including doping, surface grafting, semiconductor coupling, and defect engineering. Synthetic routes to fabricate photocatalytically active films are briefly reviewed, followed by the important factors that determine solar photocatalysis efficiency, such as film thickness and structure. Finally, some important and specific characterization methods for films are described. This review shows that there are two main challenges in the study of photocatalytic materials in the form of (thin) films. First, the production of stable and efficient solar-driven films is still a challenge that requires an integrated approach from synthesis to characterization. The second is the difficulty in properly characterizing films. In any case, the research community needs to address these, as solar-driven photocatalytic films represent a viable option for sustainable air and water purification.
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Bhartiya P, Chawla R, Dutta PK. pH‐Responsive Charge‐Convertible
N
‐Succinyl Chitosan‐Quercetin Coordination Polymer Nanoparticles for Effective NIR Photothermal Cancer Therapy. MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202200140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Prabha Bhartiya
- Polymer Research laboratory Department of Chemistry Motilal Nehru National Institute of Technology Allahabad Prayagraj 211004 India
| | - Ruchi Chawla
- Polymer Research laboratory Department of Chemistry Motilal Nehru National Institute of Technology Allahabad Prayagraj 211004 India
| | - Pradip K. Dutta
- Polymer Research laboratory Department of Chemistry Motilal Nehru National Institute of Technology Allahabad Prayagraj 211004 India
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10
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Zhou Y, Zhang Q, Shi X, Song Q, Zhou C, Jiang D. Photocatalytic reduction of CO 2 into CH 4 over Ru-doped TiO 2: Synergy of Ru and oxygen vacancies. J Colloid Interface Sci 2021; 608:2809-2819. [PMID: 34785050 DOI: 10.1016/j.jcis.2021.11.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 10/19/2022]
Abstract
Photocatalytic conversion of CO2 and H2O into CH4 is an intriguing approach to achieve solar energy utilization and CO2 conversion, yet remains challenging in conversion efficiency. In this study, we present a synthesis of defected TiO2 nanocrystal with oxygen vacancies (Vo) by a facile Ru doping-induced strategy under hydrothermal condition. The synergistic effect of Ru and oxygen vacancies contributed to the enhanced photocatalytic reduction of CO2 toward CH4. Oxygen vacancies and doped Ru not only can synergistically promote the separation of photogenerated carriers, but also promote the CO2 adsorption, thus enhancing the photocatalytic activities. The optimal Ru-doped TiO2 (denoted as 1% Ru-TiO2-x) exhibited a remarkable enhanced photocatalytic performance with a CH4 yield of 31.63 μmol·g-1·h-1, which is significantly higher than Ru-TiO2 and TiO2-x counterparts. This study systematically investigates the multiple roles of Ru in CO2 reduction and provides new insights for the construction of metal oxide photocatalysts with oxygen vacancies by simple doping of metal ions.
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Affiliation(s)
- Yimeng Zhou
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Qianxiao Zhang
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Xiangli Shi
- Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Qi Song
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Changjian Zhou
- Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Deli Jiang
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China.
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11
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Song M, Sun H, Yu J, Wang Y, Li M, Liu M, Zhao G. Enzyme-Free Molecularly Imprinted and Graphene-Functionalized Photoelectrochemical Sensor Platform for Pollutants. ACS APPLIED MATERIALS & INTERFACES 2021; 13:37212-37222. [PMID: 34327984 DOI: 10.1021/acsami.1c10242] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this work, a label-free nonenzymatic photoelectrochemical (PEC) sensor is successfully developed for the detection of a typical pollutant, microcystin-LR (MC-LR), based on a visible-light-responsive alloy oxide, with highly ordered and vertically aligned Ti-Fe-O nanotubes (NTs) as substrates. Ti-Fe-O NTs consisting mainly of TiO2 and atomically doped Fe2O3 are in situ prepared on a Ti-Fe alloy by electrochemical anodic oxidation. Using a simple electrochemical deposition technique, reduced graphene oxide (RGO) could be grown onto Ti-Fe-O NTs, exhibiting significant bifunctions. It not only provides an ideal microenvironment for functionalization of molecularly imprinted polymers (MIPs) on the surface but also serves as the PEC signal amplification element because of its outstanding conductivity for photons and electrons. The designed MIP/RGO/Ti-Fe-O NT PEC sensor exhibits high sensitivity toward MC-LR with a limit of detection as low as 10 pM. High selectivity toward MC-LR is also proven for the sensor. A promising detection platform not only for MC-LR but also for other pollutants has therefore been provided.
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Affiliation(s)
- Menglin Song
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Huanhuan Sun
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Jing Yu
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Yu Wang
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Mingfang Li
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Meichuan Liu
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
| | - Guohua Zhao
- School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Siping Road 1239, Shanghai 200092, China
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Peighambardoust NS, Aydemir U. Blue TiO 2 nanotube arrays as semimetallic materials with enhanced photoelectrochemical activity towards water splitting. Turk J Chem 2021; 44:1642-1654. [PMID: 33488259 PMCID: PMC7763108 DOI: 10.3906/kim-2004-85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 09/16/2020] [Indexed: 11/04/2022] Open
Abstract
In the past years there has been a great interest in self-doped TiO2 nanotubes (blue TiO2 nanotubes) compared to undoped ones owing to their high carrier density and conductivity. In this study, blue TiO2 nanotubes are investigated as photoanode materials for photoelectrochemical water splitting. Blue TiO2 nanotubes were fabricated with enhanced photoresponse behavior through electrochemical cathodic polarization on undoped and annealed TiO2 nanotubes. The annealing temperature of undoped TiO2 nanotubes was tuned before cathodic polarization, revealing that annealing at 500 °C improved the photoresponse of the nanotubes significantly. Further optimization of the blue TiO2 nanotubes was achieved by adjusting the cathodic polarization parameters. Blue TiO2 nanotubes obtained at the potential of –1.4 V (vs. SCE) with a duration of 10 min exhibited twice more photocurrent response (0.39 mA cm-2) compared to the undoped TiO2 nanotube arrays (0.19 mA cm-2). Oxygen vacancies formed through the cathodic polarization decreased charge recombination and enhanced charge transfer rate; therefore, a high photoelectrochemical activity under visible light irradiation could be achieved.
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Affiliation(s)
| | - Umut Aydemir
- Boron and Advanced Materials Application and Research Center, Koç University, İstanbul Turkey.,Department of Chemistry, College of Sciences, Koç University, İstanbul Turkey
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Jeong IK, Mahadik MA, Hwang JB, Chae WS, Choi SH, Jang JS. Lowering the onset potential of Zr-doped hematite nanocoral photoanodes by Al co-doping and surface modification with electrodeposited Co-Pi. J Colloid Interface Sci 2021; 581:751-763. [PMID: 32818679 DOI: 10.1016/j.jcis.2020.08.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/31/2020] [Accepted: 08/02/2020] [Indexed: 10/23/2022]
Abstract
Herein, in situ zirconium-doped hematite nanocoral (Zr-Fe2O3 (I) NC) photoanode was prepared via a specially designed diluted hydrothermal approach and modified with Al3+ co-doping and electrodeposited cobalt-phosphate ("Co-Pi") cocatalyst. Firstly, an unintentional in situ Zr-Fe2O3 (I)) NC photoanode was synthesized, which achieved an optimum photocurrent density of 0.27 mA/cm2 at 1.0 V vs. RHE but possessed a more positively shifted onset potential than conventionally prepared hematite nanorod photoelectrodes. An optimized amount of aluminum co-doping suppresses the bulk as well as surface defects, which causes a negative shift in the onset potential from 0.85 V to 0.8 V vs. RHE and enhances the photocurrent density of Zr-Fe2O3(I) NC from 0.27 mA/cm2 to 0.7 mA/cm2 at 1.0 V vs. RHE. The electrodeposited Co-Pi modification further reduce the onset potential of Al co-doped Zr-Fe2O3(I) NC to 0.58 V vs. RHE and yield a maximum photocurrent of 1.1 mA/cm2 at 1.0 V vs. RHE (1.8 mA/cm2 at 1.23 V vs RHE). The improved photocurrent at low onset potential can be attributed to synergistic effect of Al co-doping and Co-Pi surface modification. Further, during photoelectrochemical water-splitting, a 137 and 67 μmol of hydrogen (H2) and oxygen (O2) evolution was achieved over the optimum Co-Pi-modified Al-co-doped Zr-Fe2O3(I) NC photoanode within 6 h. The proposed charge transfer mechanism in optimum Co-Pi-modified Alco-doped Zr-Fe2O3(I) NC photoanodes during the photoelectrochemical water splitting was also studied.
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Affiliation(s)
- In Kwon Jeong
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Republic of Korea
| | - Mahadeo A Mahadik
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Republic of Korea
| | - Jun Beom Hwang
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Republic of Korea
| | - Weon-Sik Chae
- Daegu Center, Korea Basic Science Institute, Daegu 41566, Republic of Korea
| | - Sun Hee Choi
- Pohang Accelerator Laboratory, POSTECH, Pohang 37673, Republic of Korea.
| | - Jum Suk Jang
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Republic of Korea.
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14
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Sputtered vs. sol-gel TiO2-doped films: Characterization and assessment of aqueous bisphenol A oxidation under UV and visible light radiation. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.09.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Structural, Optical and Photocatalytic Characterization of ZnxCd1−xS Solid Solutions Synthetized Using a Simple Ultrasonic Radiation Method. ENERGIES 2020. [DOI: 10.3390/en13215603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A simple ultrasonic radiation method was employed for the preparation of zinc and cadmium sulfide solid solution (ZnxCd1−xS; x = 0–0.25 wt.%) with the aim to investigate its efficiency for H2 production via a visible light-driven water-splitting reaction. The catalyst characterization by X-ray diffraction confirmed the formation of solid solution (ZnxCd1−xS) between CdS and ZnS phases. All catalysts exhibited hierarchical morphology (from SEM and TEM) formed by aggregated nanoparticles of ZnxCd1−xS solid solution with crystals showing mainly (111) planes of cubic CdS phase. The crystal size linearly decreased with an increase in Zn incorporation in the crystal lattice (from 4.37 nm to 3.72 nm). The ZnxCd1−xS photocatalysts showed a gradual increase in the H2 evolution, with an increase in the Zn concentration up to 0.2 wt.% making the most effective Zn0.2Cd0.8S catalyst toward H2 production. From the catalyst activity–structure correlation, it has been concluded that the twin-like CdS structure, the (111) plane and specific morphology are the main factors influencing the catalyst effectivity toward H2 production. All those factors compensated for the negative effect of an increase in band gap energy (Ebg) after ZnS incorporation into solid solution (from 2.21 eV to 2.34 eV). The effect of the catalyst morphology is discussed by comparing H2 evolution over unsupported and supported Zn0.2Cd0.8S solid solutions.
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16
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Zhao H, Li CF, Liu LY, Palma B, Hu ZY, Renneckar S, Larter S, Li Y, Kibria MG, Hu J, Su BL. n-p Heterojunction of TiO 2-NiO core-shell structure for efficient hydrogen generation and lignin photoreforming. J Colloid Interface Sci 2020; 585:694-704. [PMID: 33371948 DOI: 10.1016/j.jcis.2020.10.049] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 10/08/2020] [Accepted: 10/15/2020] [Indexed: 12/12/2022]
Abstract
Hydrogen evolution from biomass photoreforming has been widely recognized as a promising strategy for relieving the pressure from energy crisis and environmental pollution, as it could generate sustainable H2 and value-added bioproducts simultaneously. Combining p-type semiconductors with n-type semiconductors to form n-p heterojunction is an effective strategy to improve the photocatalytic quantum efficiency by enhancing the separation of photogenerated electrons and holes, which could greatly facilitate the realization of such biomass photorefinery concept. However, the incompact contact between the n-type and p-type semiconductors often induces the aggregation of photogenerated electrons and holes. In this work, we design and synthesize an ultrafine n-p heterojunction TiO2-NiO core-shell structure to overcome the incompact contact in the n-p interface. When the n-p heterojunction photocatalysts are evaluated for photocatalytic water splitting and biomass lignin photoreforming respectively, the as-fabricated TiO2-NiO nanocomposite with 3.25% NiO demonstrates the highest hydrogen generation of 23.5 mmol h-1 g-1 from water splitting and H2 (0.45 mmol h-1 g-1) and CH4 (0.03 mmol h-1 g-1) cogeneration with reasonable amount of fatty acids (palmitic acid and stearic acid) production from lignin photoreforming. The excellent photocatalytic activity is ascribed to the synergistic effects of high crystallinity of TiO2 ultrafine nanoparticles, core-shell structure and n-p heterojunction with NiO nanoclusters. This present work demonstrates a simple and efficient method to fabricate ultrafine n-p heterojunction core-shell structure for noble-metal free catalyst for both water splitting and biomass photoreforming.
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Affiliation(s)
- Heng Zhao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China; Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Chao-Fan Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China; Nanostructure Research Centre (NRC), Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China
| | - Li-Yang Liu
- Department of Wood Science, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Bruna Palma
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Zhi-Yi Hu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China; Nanostructure Research Centre (NRC), Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China
| | - Scott Renneckar
- Department of Wood Science, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Stephen Larter
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Yu Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China; Nanostructure Research Centre (NRC), Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China.
| | - Md Golam Kibria
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada.
| | - Jinguang Hu
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada.
| | - Bao-Lian Su
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070 Wuhan, Hubei, China; Laboratory of Inorganic Materials Chemistry (CMI), University of Namur, 61 rue de Bruxelles, B-5000 Namur, Belgium.
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17
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Deyab NM, Salem KE, Mokhtar AM, Ramadan M, Steegstra P, Hubin A, Delplancke M, Rahier H, Allam NK. Electrochemical Fabrication of Ternary Black Ti‐Mo‐Ni Oxide Nanotube Arrays for Enhanced Photoelectrochemical Water Oxidation. ChemistrySelect 2020. [DOI: 10.1002/slct.202003491] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Nourhan M. Deyab
- Energy Materials Laboratory, School of Sciences and Engineering The American University in Cairo New Cairo 11835 Egypt
- Department of Materials and Chemistry Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium
| | - Kholoud E. Salem
- Energy Materials Laboratory, School of Sciences and Engineering The American University in Cairo New Cairo 11835 Egypt
| | - Abdelrahman M. Mokhtar
- Energy Materials Laboratory, School of Sciences and Engineering The American University in Cairo New Cairo 11835 Egypt
| | - Mohamed Ramadan
- Energy Materials Laboratory, School of Sciences and Engineering The American University in Cairo New Cairo 11835 Egypt
| | - Patrick Steegstra
- Department of Materials and Chemistry Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium
| | - Annick Hubin
- Department of Materials and Chemistry Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium
| | - Marie‐Paule Delplancke
- 4MAT, Université Libre de Bruxelles ULB, avenue Roosevelt 50, CP 165/63, 1050 Brussels Belgium
| | - Hubert Rahier
- Department of Materials and Chemistry Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium
| | - Nageh K. Allam
- Energy Materials Laboratory, School of Sciences and Engineering The American University in Cairo New Cairo 11835 Egypt
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18
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Amin A, El-dissouky A. One-step synthesis of novel Cu2ZnNiO3 complex oxide nanowires with tuned band gap for photoelectrochemical water splitting. J Appl Crystallogr 2020. [DOI: 10.1107/s1600576720012200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Although alloying and nanostructuring offer a great opportunity for enhancing photoelectrochemical behavior and band gap tuning, these methods have not been investigated extensively. This article reports the synthesis of Cu2ZnNiO3 complex oxide nanowires (∼200 nm) grown on German silver alloy via a one-step optimized hydrothermal route and their utilization to split water photoelectrochemically. Surface characterizations were used to elucidate the formation mechanism of the Cu2ZnNiO3 complex oxide nanowires. The nanowires exhibited an exceptional visible light absorption extending from 400 to 1400 nm wavelengths with a tuned band gap of ∼2.88 eV calculated from the corresponding Tauc plot. In tests to split water photoelectrochemically, the nanowires generated a significant photocurrent of up to −2.5 mA cm−2 at −0.8 V versus Ag/AgCl and exhibited an exceptional photostability which exceeded 2 h under light-off conditions with no photocurrent decay. Band edge positions related to water redox potentials were estimated via Mott–Schottky and diffuse reflectance spectroscopy analysis with the density of charge carriers reaching as high as 5.15 × 1018 cm−3. Moreover, the nanowires generated ∼1100 µmol of H2 in 5 h. These photoelectrochemical results are much higher than the reported values for similar structures of copper oxide, zinc oxide and nickel oxide separately under the same conditions, which can be attributed to the advantages of Cu, Zn and Ni oxides (such as visible light absorption, photostability, and efficient charge carrier generation and transport) being combined in one single material. These promising results make German silver a robust material toward photoelectrochemical water splitting.
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19
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Wu H, Tan HL, Toe CY, Scott J, Wang L, Amal R, Ng YH. Photocatalytic and Photoelectrochemical Systems: Similarities and Differences. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1904717. [PMID: 31814196 DOI: 10.1002/adma.201904717] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/17/2019] [Indexed: 05/10/2023]
Abstract
Photocatalytic and photoelectrochemical processes are two key systems in harvesting sunlight for energy and environmental applications. As both systems are employing photoactive semiconductors as the major active component, strategies have been formulated to improve the properties of the semiconductors for better performances. However, requirements to yield excellent performances are different in these two distinctive systems. Although there are universal strategies applicable to improve the performance of photoactive semiconductors, similarities and differences exist when the semiconductors are to be used differently. Here, considerations on selected typical factors governing the performances in photocatalytic and photoelectrochemical systems, even though the same type of semiconductor is used, are provided. Understanding of the underlying mechanisms in relation to their photoactivities is of fundamental importance for rational design of high-performing photoactive materials, which may serve as a general guideline for the fabrication of good photocatalysts or photoelectrodes toward sustainable solar fuel generation.
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Affiliation(s)
- Hao Wu
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
- School of Energy and Environment, City University of Hong Kong, Kowloon, 999077, Hong Kong SAR
| | - Hui Ling Tan
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Nishi-Ku, Fukuoka, 8190395, Japan
| | - Cui Ying Toe
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
| | - Jason Scott
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
| | - Lianzhou Wang
- School of Chemical Engineering, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland, 4072, Australia
| | - Rose Amal
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
| | - Yun Hau Ng
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia
- School of Energy and Environment, City University of Hong Kong, Kowloon, 999077, Hong Kong SAR
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20
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Effect of reaction protocol on the nature and size of iron oxide nano particles obtained through solventless synthesis using iron(II)acetate: structural, magnetic and morphological studies. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-019-1881-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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21
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Leukkunen PM, Rani E, Sasikala Devi AA, Singh H, King G, Alatalo M, Cao W, Huttula M. Synergistic effect of Ni–Ag–rutile TiO2 ternary nanocomposite for efficient visible-light-driven photocatalytic activity. RSC Adv 2020; 10:36930-36940. [PMID: 35517973 PMCID: PMC9057027 DOI: 10.1039/d0ra07078e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 09/24/2020] [Indexed: 11/21/2022] Open
Abstract
P25 comprising of mixed anatase and rutile phases is known to be highly photocatalytically active compared to the individual phases. Using a facile wet chemical method, we demonstrate a ternary nanocomposite consisting of Ni and Ag nanoparticles, decorated on the surface of XTiO2 (X: P25, rutile (R)) as an efficient visible-light-driven photocatalyst. Contrary to the current perspective, RTiO2-based Ni–Ag–RTiO2 shows the highest activity with the H2 evolution rate of ∼86 μmol g−1 W−1 h−1@535 nm. Together with quantitative assessment of active Ni, Ag and XTiO2 in these ternary systems using high energy synchrotron X-ray diffraction, transmission electron microscopy coupled energy dispersive spectroscopy mapping evidences the metal to semiconductor contact via Ag. The robust photocatalytic activity is attributed to the improved visible light absorption, as noted by the observed band edge of ∼2.67 eV corroborating well with the occurrence of Ti3+ in Ti 2p XPS. The effective charge separation due to intimate contact between Ni and RTiO2via Ag is further evidenced by the plasmon loss peak in Ag 3d XPS. Moreover, density functional theory calculations revealed enhanced adsorption of H2 on Ti8O16 clusters when both Ag and Ni are simultaneously present, owing to the hybridization of the metal atoms with d orbitals of Ti and p orbitals of O leading to enhanced bonding characteristics, as substantiated by the density of states. Additionally, the variation in the electronegativity in Bader charge analysis indicates the possibility of hydrogen evolution at the Ni sites, in agreement with the experimental observations. Robust photocatalytic activity of Ni–Ag–RTiO2 is attributed to the improved visible light absorption and effective charge separation due to intimate contact between Ni and RTiO2via Ag, as evidenced by Ti3+ in Ti 2p XPS and energy dispersive mapping.![]()
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Affiliation(s)
| | - Ekta Rani
- Nano and Molecular Systems Research Unit
- University of Oulu
- Finland
| | | | | | | | - Matti Alatalo
- Nano and Molecular Systems Research Unit
- University of Oulu
- Finland
| | - Wei Cao
- Nano and Molecular Systems Research Unit
- University of Oulu
- Finland
| | - Marko Huttula
- Nano and Molecular Systems Research Unit
- University of Oulu
- Finland
- School of Materials Science and Engineering
- Henan University of Science and Technology
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22
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Bandaru S, Saranya G, Liu WW, English NJ. First-principles studies on α-Fe2O3 surface slabs and mechanistic elucidation of a g-C3N4/α-Fe2O3 heterojunction. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02262g] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
First-principles calculations were carried out to explore the surface energies and electronic properties of α-Fe2O3 surface slabs. Further, to enhance the photocatalytic activity of Fe2O3, an alternative effective strategy was to examine Fe2O3-based heterostructures.
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Affiliation(s)
- Sateesh Bandaru
- College of Materials and Environmental Engineering
- Institute for Advanced Magnetic Materials
- Hangzhou Dianzi University
- Hangzhou 310018
- China
| | | | - Wei Wei Liu
- College of Materials and Environmental Engineering
- Institute for Advanced Magnetic Materials
- Hangzhou Dianzi University
- Hangzhou 310018
- China
| | - Niall J. English
- School of Chemical and Bioprocess Engineering
- University College Dublin
- Ireland
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23
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Lu H, Wang G, Dai R, Ding X, Liu M, Sun H, Sun C, Zhao G. Visible-light-driven photoelectrochemical aptasensor based on reduced graphene oxide/Ti–Fe–O nanotube arrays for highly sensitive and selective determination of microcystin-LR. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134820] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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24
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Current progress in developing metal oxide nanoarrays-based photoanodes for photoelectrochemical water splitting. Sci Bull (Beijing) 2019; 64:1348-1380. [PMID: 36659664 DOI: 10.1016/j.scib.2019.07.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 06/27/2019] [Accepted: 07/03/2019] [Indexed: 01/21/2023]
Abstract
Solar energy driven photoelectrochemical (PEC) water splitting is a clean and powerful approach for renewable hydrogen production. The design and construction of metal oxide based nanoarray photoanodes is one of the promising strategies to make the continuous breakthroughs in solar to hydrogen conversion efficiency of PEC cells owing to their owned several advantages including enhanced reactive surface at the electrode/electrolyte interface, improved light absorption capability, increased charge separation efficiency and direct electron transport pathways. In this Review, we first introduce the structure, work principle and their relevant efficiency calculations of a PEC cell. We then give a summary of the state-of the-art research in the preparation strategies and growth mechanism for the metal oxide based nanoarrays, and some details about the performances of metal oxide based nanoarray photoanodes for PEC water splitting. Finally, we discuss key aspects which should be addressed in continued work on realizing high-efficiency metal oxide based nanoarray photoanodes for PEC solar water splitting systems.
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25
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26
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Zhang C, Li J, Yang C, Gong S, Jiang H, Sun M, Qian C. A pH-sensitive coordination polymer network-based nanoplatform for magnetic resonance imaging-guided cancer chemo-photothermal synergistic therapy. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 23:102071. [PMID: 31442581 DOI: 10.1016/j.nano.2019.102071] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 07/05/2019] [Accepted: 07/21/2019] [Indexed: 01/15/2023]
Abstract
Developing various kinds of nanoplatforms with integrated diagnostic and therapeutic functions would be significant for imaging-guided precision treatment of cancer. However, it is still a challenge to organically integrate therapeutic and imaging components into a single nano-system rather than simply mixing. Herein, an iron-gallic acid network-based nanoparticle (Fe-GA@PEG-PLGA) was designed for magnetic resonance imaging (MRI)-guided chemo-photothermal synergistic therapy of tumors. The tumor spatial location and size information can be accurately achieved due to T1 MRI based on Fe3+ coordination with GA in Fe-GA network. Furthermore, the nanoparticle exhibited extraordinary photostability and photothermal therapy capacity exceeded 42 °C within 100 s under 808 nm laser irradiation. Meanwhile, the Fe-GA polymeric network can be disassembled in tumor acidic environment and the released drug GA can induce apoptosis. This study demonstrated that the Fe-GA network-based nanoparticle is a promising diagnostic and therapeutic agent for theranostic application and further clinic translation.
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Affiliation(s)
- Cuiting Zhang
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China
| | - Jing Li
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China
| | - Chenxi Yang
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China
| | - Siman Gong
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China
| | - Hulin Jiang
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China
| | - Minjie Sun
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China.
| | - Chenggen Qian
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing, PR China.
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27
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Sheng X, Xu T, Feng X. Rational Design of Photoelectrodes with Rapid Charge Transport for Photoelectrochemical Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805132. [PMID: 30637813 DOI: 10.1002/adma.201805132] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 11/23/2018] [Indexed: 06/09/2023]
Abstract
Photoelectrode materials are the heart of photoelectrochemical (PEC) cells, which hold great promise to address global energy and environmental issues by converting solar energy into electricity or chemical fuels. In recent decades, significant research efforts have been devoted to the design and construction of photoelectrodes for the efficient generation and utilization of charge carriers to boost PEC performance. Herein, insights from a literature study on the relationship between the architecture and charge dynamics of photoelectrodes are presented. After briefly introducing the fundamental theories of charge dynamics in nanostructured photoelectrodes, the development of photoelectrode design in 1D polycrystalline nanotube arrays, 1D single-crystalline nanowire arrays, and hierarchical and mesoporous nanowire arrays is reviewed with a focus on the interplay between architecture and charge transport properties. For each design, commonly used synthetic approaches and the corresponding charge transport properties are discussed. Subsequently, the applications of these photoelectrodes in PEC systems are summarized. In conclusion, future challenges in the rational design of photoelectrode architecture are presented. The basic relationships between the architectures and charge dynamics of photoelectrode materials discussed here are expected to provide pertinent guidance and a reference for future advanced material design targeting improved light energy conversion systems.
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Affiliation(s)
- Xia Sheng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Tao Xu
- Department of Chemistry and Biochemistry, Northern Illinois University, Dekalb, IL, 60115, USA
| | - Xinjian Feng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
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28
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Khajeh Aminian M, Fatah S. Loading of alkaline hydroxide nanoparticles on the surface of Fe2O3 for the promotion of photocatalytic activity. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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The Titanium–Aluminum Binary Oxide Immobilized over Long-Axis SBA-15 as Efficient and Benign Catalyst for Conversion of Sucrose into 5-Hydroxymethylfurfural. CATALYSIS SURVEYS FROM ASIA 2019. [DOI: 10.1007/s10563-019-09267-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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30
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Fe-Ti alloy layer plasma deposition – Monitoring of plasma parameters and properties of deposited alloys, anodization and photoelectrochemical characterization. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.12.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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31
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Chiu YH, Lai TH, Chen CY, Hsieh PY, Ozasa K, Niinomi M, Okada K, Chang TFM, Matsushita N, Sone M, Hsu YJ. Fully Depleted Ti-Nb-Ta-Zr-O Nanotubes: Interfacial Charge Dynamics and Solar Hydrogen Production. ACS APPLIED MATERIALS & INTERFACES 2018; 10:22997-23008. [PMID: 29664283 DOI: 10.1021/acsami.8b00727] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Poor kinetics of hole transportation at the electrode/electrolyte interface is regarded as a primary cause for the mediocre performance of n-type TiO2 photoelectrodes. By adopting nanotubes as the electrode backbone, light absorption and carrier collection can be spatially decoupled, allowing n-type TiO2, with its short hole diffusion length, to maximize the use of the available photoexcited charge carriers during operation in photoelectrochemical (PEC) water splitting. Here, we presented a delicate electrochemical anodization process for the preparation of quaternary Ti-Nb-Ta-Zr-O mixed-oxide (denoted as TNTZO) nanotube arrays and demonstrated their utility in PEC water splitting. The charge-transfer dynamics for the electrodes was investigated using time-resolved photoluminescence, electrochemical impedance spectroscopy, and the decay of open-circuit voltage analysis. Data reveal that the superior photoactivity of TNTZO over pristine TiO2 originated from the introduction of Nd, Ta, and Zr elements, which enhanced the amount of accessible charge carriers, modified the electronic structure, and improved the hole injection kinetics for expediting water splitting. By modulating the water content of the electrolyte employed in the anodization process, the wall thickness of the grown TNTZO nanotubes can be reduced to a size smaller than that of the depletion layer thickness, realizing a fully depleted state for charge carriers to further advance the PEC performance. Hydrogen evolution tests demonstrate the practical efficacy of TNTZO for realizing solar hydrogen production. Furthermore, with the composition complexity and fully depleted band structure, the present TNTZO nanotube arrays may offer a feasible and universal platform for the loading of other semiconductors to construct a sophisticated heterostructure photoelectrode paradigm, in which the photoexcited charge carriers can be entirely utilized for efficient solar-to-fuel conversion.
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Affiliation(s)
- Yi-Hsuan Chiu
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
- Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Ting-Hsuan Lai
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
| | - Chun-Yi Chen
- Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
- CREST, Japan Science and Technology Agency , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Ping-Yen Hsieh
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
| | - Kazunari Ozasa
- Bioengineering Lab, RIKEN , 2-1 Hirosawa , Wako, Saitama 351-0198 , Japan
| | - Mitsuo Niinomi
- Institute for Materials Research , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan
| | - Kiyoshi Okada
- Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Tso-Fu Mark Chang
- Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
- CREST, Japan Science and Technology Agency , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Nobuhiro Matsushita
- Department of Materials Science and Engineering , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Masato Sone
- Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
- CREST, Japan Science and Technology Agency , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan
| | - Yung-Jung Hsu
- Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan
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Balu S, Uma K, Pan GT, Yang TCK, Ramaraj SK. Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO₂@α-Fe₂O₃ Nanocomposites Deposited on SnS₂ Flowers. MATERIALS 2018; 11:ma11061030. [PMID: 29914208 PMCID: PMC6025432 DOI: 10.3390/ma11061030] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/04/2018] [Accepted: 06/13/2018] [Indexed: 11/16/2022]
Abstract
Semiconductor materials have been shown to have good photocatalytic behavior and can be utilized for the photodegradation of organic pollutants. In this work, three-dimensional flower-like SnS2 (tin sulfide) was synthesized by a facile hydrothermal method. Core-shell structured SiO2@α-Fe2O3 nanocomposites were then deposited on the top of the SnS2 flowers. The as-synthesized nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–Vis Spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, and photoluminescence (PL) spectroscopy. The photocatalytic behavior of the SnS2-SiO2@α-Fe2O3 nanocomposites was investigated by observing the degradation of methylene blue (MB). The results show an effective enhancement of photocatalytic activity for the degradation of MB especially for the 15 wt % SiO2@α-Fe2O3 nanocomposites on SnS2 flowers.
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Affiliation(s)
- Sridharan Balu
- Department of Chemical Engineering and biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, (S.B.).
| | - Kasimayan Uma
- Precision Analysis and Research Center, National Taipei University of Technology, Taipei 106, Taiwan.
| | - Guan-Ting Pan
- Department of Chemical Engineering and biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, (S.B.).
| | - Thomas C-K Yang
- Department of Chemical Engineering and biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, (S.B.).
- Precision Analysis and Research Center, National Taipei University of Technology, Taipei 106, Taiwan.
| | - Sayee Kannan Ramaraj
- PG & Research Department of Chemistry, Thiagarajar College, Madurai 625009, Tamilnadu, India.
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33
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Array of electrodeposited Ru-decorated TiO2 nanotubes with enhanced photoresponse. J Solid State Electrochem 2018. [DOI: 10.1007/s10008-018-3955-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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34
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Band-gap narrowing and electrochemical properties in N-doped and reduced anodic TiO2 nanotube arrays. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.03.091] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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35
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Farsinezhad S, Shanavas T, Mahdi N, Askar AM, Kar P, Sharma H, Shankar K. Core-shell titanium dioxide-titanium nitride nanotube arrays with near-infrared plasmon resonances. NANOTECHNOLOGY 2018; 29:154006. [PMID: 29406316 DOI: 10.1088/1361-6528/aaad58] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Titanium nitride (TiN) is a ceramic with high electrical conductivity which in nanoparticle form, exhibits localized surface plasmon resonances (LSPRs) in the visible region of the solar spectrum. The ceramic nature of TiN coupled with its dielectric loss factor being comparable to that of gold, render it attractive for CMOS polarizers, refractory plasmonics, surface-enhanced Raman scattering and a whole host of sensing applications. We report core-shell TiO2-TiN nanotube arrays exhibiting LSPR peaks in the range 775-830 nm achieved by a simple, solution-based, low cost, large area-compatible fabrication route that does not involve laser-writing or lithography. Self-organized, highly ordered TiO2 nanotube arrays were grown by electrochemical anodization of Ti thin films on fluorine-doped tin oxide-coated glass substrates and then conformally coated with a thin layer of TiN using atomic layer deposition. The effects of varying the TiN layer thickness and thermal annealing on the LSPR profiles were also investigated. Modeling the TiO2-TiN core-shell nanotube structure using two different approaches, one employing effective medium approximations coupled with Fresnel coefficients, resulted in calculated optical spectra that closely matched the experimentally measured spectra. Modeling provided the insight that the observed near-infrared resonance was not collective in nature, and was mainly attributable to the longitudinal resonance of annular nanotube-like TiN particles redshifted due to the presence of the higher permittivity TiO2 matrix. The resulting TiO2-TiN core-shell nanotube structures also function as visible light responsive photocatalysts, as evidenced by their photoelectrochemical water-splitting performance under light emitting diode illumination using 400, 430 and 500 nm photons.
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Affiliation(s)
- Samira Farsinezhad
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
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36
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Current Advances in TiO2-Based Nanostructure Electrodes for High Performance Lithium Ion Batteries. BATTERIES-BASEL 2018. [DOI: 10.3390/batteries4010007] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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37
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Sheu FJ, Cho CP. High Efficiency for Hydrogen Evolution and Bacterial Inactivation of Ag-TiO2
-Graphene Ternary Nanocomposites with Appropriate Ag Ratios. ChemistrySelect 2018. [DOI: 10.1002/slct.201702430] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Fu-Jye Sheu
- Department of Applied Materials and Optoelectronic Engineering; National Chi Nan University; Nantou County 54561 Taiwan Republic of China
| | - Chun-Pei Cho
- Department of Applied Materials and Optoelectronic Engineering; National Chi Nan University; Nantou County 54561 Taiwan Republic of China
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38
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Phuan YW, Ong WJ, Chong MN, Ocon JD. Prospects of electrochemically synthesized hematite photoanodes for photoelectrochemical water splitting: A review. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2017. [DOI: 10.1016/j.jphotochemrev.2017.10.001] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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39
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Zlámal M, Paušová Š, Kment Š, Hubička Z, Krýsa J. Transparent α-Fe 2 O 3 /TiO 2 nanotubular photoanodes. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.10.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Žerjav G, Arshad MS, Djinović P, Junkar I, Kovač J, Zavašnik J, Pintar A. Improved electron-hole separation and migration in anatase TiO 2 nanorod/reduced graphene oxide composites and their influence on photocatalytic performance. NANOSCALE 2017; 9:4578-4592. [PMID: 28321442 DOI: 10.1039/c7nr00704c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The as-synthesized TiO2 nanorods a-TNR (amorphous TiO2 layer covering the crystalline anatase TiO2 core) and TNR (fully crystalline anatase TiO2) were decorated with reduced graphene oxide (rGO) to synthesize two series of TiO2 + rGO composites with different nominal loadings of GO (from 4 to 20 wt%). The structural, surface and electronic properties of the obtained TiO2 + rGO composites were analyzed and correlated to their performance in the photocatalytic oxidation of aqueous bisphenol A solution. X-ray photoelectron spectroscopy (XPS) analyses revealed that charge separation in TiO2 + rGO composites is improved due to the perfect matching of TiO2 and rGO valence band maxima (VBM). Cyclic voltammetry (CV) experiments revealed that the peak-to-peak separations (ΔEp) are the lowest and the oxidation current densities are the highest for composites with a nominal 10 wt% GO content, meaning that it is much easier for the charge carriers to percolate through the solid, resulting in improved charge migration. Due to the high charge carrier mobility in rGO and perfect VBM matching between TiO2 and rGO, the electron-hole recombination in composites was suppressed, resulting in more electrons and holes being able to participate in the photocatalytic reaction. rGO amounts above 10 wt% decreased the photocatalytic activity; thus, it is critical to optimize its amount in the TiO2 + rGO composites for achieving the highest photocatalytic activity. BPA degradation rates correlated completely with the results of the CV measurements, which directly evidenced improved charge separation and migration as the crucial parameters governing photocatalysis.
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Affiliation(s)
- Gregor Žerjav
- Department for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
| | - Muhammad Shahid Arshad
- Department for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
| | - Petar Djinović
- Department for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
| | - Ita Junkar
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Janez Kovač
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Janez Zavašnik
- Centre for Electron Microscopy and Microanalysis, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Albin Pintar
- Department for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
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41
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Li C, Li A, Luo Z, Zhang J, Chang X, Huang Z, Wang T, Gong J. Surviving High-Temperature Calcination: ZrO2-Induced Hematite Nanotubes for Photoelectrochemical Water Oxidation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611330] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chengcheng Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Ang Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Zhibin Luo
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Jijie Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Xiaoxia Chang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Zhiqi Huang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Tuo Wang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Jinlong Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Weijin Road 92 Tianjin 300072 China
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42
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Li C, Li A, Luo Z, Zhang J, Chang X, Huang Z, Wang T, Gong J. Surviving High-Temperature Calcination: ZrO 2 -Induced Hematite Nanotubes for Photoelectrochemical Water Oxidation. Angew Chem Int Ed Engl 2017; 56:4150-4155. [PMID: 28220996 DOI: 10.1002/anie.201611330] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 02/04/2016] [Indexed: 11/12/2022]
Abstract
Nanotubular Fe2 O3 is a promising photoanode material, and producing morphologies that withstand high-temperature calcination (HTC) is urgently needed to enhance the photoelectrochemical (PEC) performance. This work describes the design and fabrication of Fe2 O3 nanotube arrays that survive HTC for the first time. By introducing a ZrO2 shell on hydrothermal FeOOH nanorods by atomic layer deposition, subsequent high-temperature solid-state reaction converts FeOOH-ZrO2 nanorods to ZrO2 -induced Fe2 O3 nanotubes (Zr-Fe2 O3 NTs). The structural evolution of the hematite nanotubes is systematically explored. As a result of the nanostructuring and shortened charge collection distance, the nanotube photoanode shows a greatly improved PEC water oxidation activity, exhibiting a photocurrent density of 1.5 mA cm-2 at 1.23 V (vs. reversible hydrogen electrode, RHE), which is the highest among hematite nanotube photoanodes without co-catalysts. Furthermore, a Co-Pi decorated Zr-Fe2 O3 NT photoanode reveals an enhanced onset potential of 0.65 V (vs. RHE) and a photocurrent of 1.87 mA cm-2 (at 1.23 V vs. RHE).
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Affiliation(s)
- Chengcheng Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Ang Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Zhibin Luo
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Jijie Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Xiaoxia Chang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Zhiqi Huang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Tuo Wang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Jinlong Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
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43
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Tang MH, Chakthranont P, Jaramillo TF. Top-down fabrication of fluorine-doped tin oxide nanopillar substrates for solar water splitting. RSC Adv 2017. [DOI: 10.1039/c7ra02937c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanopillar fluorine-doped tin oxide (FTO) substrates fabricated by nanosphere lithography and argon milling enhance the photoelectrochemical performance of WO3 photoanodes.
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Affiliation(s)
- Maureen H. Tang
- Department of Chemical and Biological Engineering
- Drexel University
- Philadelphia
- USA
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44
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Sun L, Wu Z, Xiang S, Yu J, Wang Y, Lin C, Lin Z. High-efficiency photoelectrochemical hydrogen generation enabled by p-type semiconductor nanoparticle-decorated n-type nanotube arrays. RSC Adv 2017. [DOI: 10.1039/c6ra27388b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
A photoelectrocatalytic hydrogen production rate of 37.8 μmol h−1 cm−2 was obtained by a newly designed NiO nanoparticle modified TiO2 nanotube array photoanode.
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Affiliation(s)
- Lan Sun
- State Key Laboratory of Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xianmen 361005
| | - Zhi Wu
- State Key Laboratory of Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xianmen 361005
| | - Siwan Xiang
- State Key Laboratory of Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xianmen 361005
| | - Jiangdong Yu
- State Key Laboratory of Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xianmen 361005
| | - Yingying Wang
- State Key Laboratory of Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xianmen 361005
| | - Changjian Lin
- State Key Laboratory of Physical Chemistry of Solid Surface
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xianmen 361005
| | - Zhiqun Lin
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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45
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Uddin MT, Nicolas Y, Olivier C, Jaegermann W, Rockstroh N, Junge H, Toupance T. Band alignment investigations of heterostructure NiO/TiO2 nanomaterials used as efficient heterojunction earth-abundant metal oxide photocatalysts for hydrogen production. Phys Chem Chem Phys 2017; 19:19279-19288. [DOI: 10.1039/c7cp01300k] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Earth-abundant NiO/TiO2 heterostructures lead to enhanced H2 production by methanol photoreforming due to favorable band bending at the interface of the NiO/anatase TiO2 p–n heterojunction.
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Affiliation(s)
- Md. T. Uddin
- Institut des Sciences Moléculaires
- ISM UMR 5255 CNRS
- Université de Bordeaux
- F-33405 Talence Cédex
- France
| | - Y. Nicolas
- Institut des Sciences Moléculaires
- ISM UMR 5255 CNRS
- Université de Bordeaux
- F-33405 Talence Cédex
- France
| | - C. Olivier
- Institut des Sciences Moléculaires
- ISM UMR 5255 CNRS
- Université de Bordeaux
- F-33405 Talence Cédex
- France
| | - W. Jaegermann
- Fachbereich Material-und Geowissenschaften
- Technische Universität Darmstadt
- 64287 Darmstadt
- Germany
| | - N. Rockstroh
- Leibniz Institute for Catalysis
- University of Rostock
- D-18059 Rostock
- Germany
| | - H. Junge
- Leibniz Institute for Catalysis
- University of Rostock
- D-18059 Rostock
- Germany
| | - T. Toupance
- Institut des Sciences Moléculaires
- ISM UMR 5255 CNRS
- Université de Bordeaux
- F-33405 Talence Cédex
- France
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46
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Feng H, Wang Y, Wang C, Diao F, Zhu W, Mu P, Yuan L, Zhou G, Rosei F. Defect-induced enhanced photocatalytic activities of reduced α-Fe2O3 nanoblades. NANOTECHNOLOGY 2016; 27:295703. [PMID: 27285480 DOI: 10.1088/0957-4484/27/29/295703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bicrystalline α-Fe2O3 nanoblades (NBs) synthesized by thermal oxidation of iron foils were reduced in vacuum, to study the effect of reduction treatment on microstructural changes and photocatalytic properties. After the vacuum reduction, most bicrystalline α-Fe2O3 NBs transform into single-layered NBs, which contain more defects such as oxygen vacancies, perfect dislocations and dense pores. By comparing the photodegradation capability of non-reduced and reduced α-Fe2O3 NBs over model dye rhodamine B (RhB) in the presence of hydrogen peroxide, we find that vacuum-reduction induced microstructural defects can significantly enhance the photocatalytic efficiency. Even after 10 cycles, the reduced α-Fe2O3 NBs still show a very high photocatalytic activity. Our results demonstrate that defect engineering is a powerful tool to enhance the photocatalytic performance of nanomaterials.
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Affiliation(s)
- Honglei Feng
- College of Physics & The Cultivation Base for State Key Laboratory, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, People's Republic of China
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Heo K, Lee BY, Lee H, Cho DG, Arif M, Kim KY, Choi YJ, Hong S. Carbon and metal nanotube hybrid structures on graphene as efficient electron field emitters. NANOTECHNOLOGY 2016; 27:275301. [PMID: 27233004 DOI: 10.1088/0957-4484/27/27/275301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report a facile and efficient method for the fabrication of highly-flexible field emission devices by forming tubular hybrid structures based on carbon nanotubes (CNTs) and nickel nanotubes (Ni NTs) on graphene-based flexible substrates. By employing an infiltration process in anodic alumina oxide (AAO) templates followed by Ni electrodeposition, we could fabricate CNT-wrapped Ni NT/graphene hybrid structures. During the electrodeposition process, the CNTs served as Ni nucleation sites, resulting in a large-area array of high aspect-ratio field emitters composed of CNT-wrapped Ni NT hybrid structures. As a proof of concepts, we demonstrate that high-quality flexible field emission devices can be simply fabricated using our method. Remarkably, our proto-type field emission devices exhibited a current density higher by two orders of magnitude compared to other devices fabricated by previous methods, while maintaining its structural integrity in various bending deformations. This novel fabrication strategy can be utilized in various applications such as optoelectronic devices, sensors and energy storage devices.
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Affiliation(s)
- Kwang Heo
- Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea. Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Korea
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48
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Sonication-polished anodic TiO2 nanotube array-based photoanode for efficient solar energy conversion. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3301-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Fe 3+-Doped TiO₂ Nanotube Arrays on Ti-Fe Alloys for Enhanced Photoelectrocatalytic Activity. NANOMATERIALS 2016; 6:nano6060107. [PMID: 28335234 PMCID: PMC5302616 DOI: 10.3390/nano6060107] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 05/30/2016] [Accepted: 06/01/2016] [Indexed: 01/28/2023]
Abstract
Highly ordered, vertically oriented Fe3+-doped TiO2 nanotube arrays (Fe-TNTs) were prepared on Ti-Fe alloy substrates with different Fe contents by the electrochemical anodization method. The as-prepared Fe-TNTs were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and related electrochemical techniques. XPS results demonstrated that Fe3+ ions were successfully doped into TiO2 nanotubes. The photoelectrochemical activity of Fe-TNTs was compared with that of pure TiO2 nanotube arrays (TNTs). The results showed that Fe-TNTs grown on low concentration (0.5 wt %–1 wt % Fe) Ti-Fe alloys possessed higher photocurrent density than TNTs. The Fe-TNTs grown on Ti-Fe alloy containing 0.8 wt % Fe exhibited the highest photoelectrochemical activity and the photoelectrocatalytic degradation rate of methylene blue (MB) aqueous solution was significantly higher than that of TNTs.
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Deng H, Huang MC, Weng WH, Lin JC. Iron oxide nanotube film formed on carbon steel for photoelectrochemical water splitting: effect of annealing temperature. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.6032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hongda Deng
- School of Metallurgical and Materials Engineering; Chongqing University of Science and Technology; Chongqing 401331 P. R. China
- Institute of Materials Science and Engineering; National Central University; Taoyuan 32001 Taiwan R.O.C
| | - Mao-Chia Huang
- Institute of Materials Science and Engineering; National Central University; Taoyuan 32001 Taiwan R.O.C
| | - Wei-Heng Weng
- Institute of Materials Science and Engineering; National Central University; Taoyuan 32001 Taiwan R.O.C
| | - Jing-Chie Lin
- Institute of Materials Science and Engineering; National Central University; Taoyuan 32001 Taiwan R.O.C
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