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Guan Y, Gu X, Deng Q, Wang S, Li Z, Yan S, Zou Z. Synergy Effect of the Enhanced Local Electric Field and Built-In Electric Field of CoS/Mo-Doped BiVO 4 for Photoelectrochemical Water Oxidation. Inorg Chem 2023; 62:16919-16931. [PMID: 37792966 DOI: 10.1021/acs.inorgchem.3c02622] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Bismuth vanadate is a promising material for photoelectrochemical water oxidation. However, it suffers from a low quantum efficiency, poor stability, and slow water oxidation kinetics. Here, we developed a novel photoanode of CoS/Mo-BiVO4 with excellent photoelectrochemical water oxidation performance. It achieved a photocurrent density of 4.5 mA cm-2 at 1.23 V versus the reversible hydrogen electrode, ∼4 times that of BiVO4. The CoS/Mo-BiVO4 photoanode also exhibited good stability, and the photocurrent density generated by the CoS/Mo-BiVO4 photoanode did not significantly decrease after light irradiation for 2 h. Upon replacement of part of the V with Mo doping in BiVO4, the local electric field around the Mo-O bond was enhanced, thus promoting carrier separation in BiVO4. The CoS was deposited on the surface of Mo-BiVO4, forming a built-in electric field at the interface. Under the action of the bias electric field and the built-in electric field, the carriers of CoS/Mo-BiVO4 were efficiently separated in the direction of the inverse type II heterojunction. In addition, CoS improved the light absorption and charge injection efficiency of the CoS/Mo-BiVO4 photoanode.
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Affiliation(s)
- Yuan Guan
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Xinyi Gu
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Qiankun Deng
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Shaomang Wang
- School of Urban Construction, Changzhou University, Changzhou 213164, P. R. China
| | - Zhongyu Li
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Shicheng Yan
- Eco-Materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, P. R. China
| | - Zhigang Zou
- Eco-Materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, P. R. China
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Yang Z, Zhou S, Feng X, Wang N, Ola O, Zhu Y. Recent Progress in Multifunctional Graphene-Based Nanocomposites for Photocatalysis and Electrocatalysis Application. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2028. [PMID: 37446544 DOI: 10.3390/nano13132028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/02/2023] [Accepted: 07/04/2023] [Indexed: 07/15/2023]
Abstract
The global energy shortage and environmental degradation are two major issues of concern in today's society. The production of renewable energy and the treatment of pollutants are currently the mainstream research directions in the field of photocatalysis. In addition, over the last decade or so, graphene (GR) has been widely used in photocatalysis due to its unique physical and chemical properties, such as its large light-absorption range, high adsorption capacity, large specific surface area, and excellent electronic conductivity. Here, we first introduce the unique properties of graphene, such as its high specific surface area, chemical stability, etc. Then, the basic principles of photocatalytic hydrolysis, pollutant degradation, and the photocatalytic reduction of CO2 are summarized. We then give an overview of the optimization strategies for graphene-based photocatalysis and the latest advances in its application. Finally, we present challenges and perspectives for graphene-based applications in this field in light of recent developments.
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Affiliation(s)
- Zanhe Yang
- State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Siqi Zhou
- State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Xiangyu Feng
- State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Nannan Wang
- State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Oluwafunmilola Ola
- Advanced Materials Group, Faculty of Engineering, The University of Nottingham, Nottingham NG7 2RD, UK
| | - Yanqiu Zhu
- State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
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3
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Khusnun N, Arshad A, Jalil A, Firmansyah L, Hassan N, Nabgan W, Fauzi A, Bahari M, Ya'aini N, Johari A, Saravanan R. An avant-garde of carbon-doped photoanode materials on photo-electrochemical water splitting performance: A review. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.117139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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4
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Zhang X, Zhang S, Cui X, Zhou W, Cao W, Cheng D, Sun Y. Recent Advances in TiO2-based Photoanodes for Photoelectrochemical Water Splitting. Chem Asian J 2022; 17:e202200668. [PMID: 35925726 DOI: 10.1002/asia.202200668] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 07/31/2022] [Indexed: 11/12/2022]
Abstract
Photoelectrochemical (PEC) water splitting has attracted a great attention in the past several decades which holds great promise to address global energy and environmental issues by converting solar energy into hydrogen. However, its low solar-to-hydrogen (STH) conversion efficiency remains a bottleneck for practical application. Developing efficient photoelectrocatalysts with high stability and high STH conversion efficiency is one of the key challenges. As a typical n-type semiconductor, titanium dioxide (TiO 2 ) exhibits high PEC water splitting performance, especially high chemical and photo stability. But, TiO 2 has also disadvantages such as wide band gap and fast electron-hole recombination rate, which seriously hinder its PEC performance. This review focuses on recent development in TiO 2 -based photoanodes as well as some key fundamentals. The corresponding mechanisms and key factors for high STH, and controllable synthesis and modification strategies are highlighted in this review. We conclude finally with an outlook providing a critical perspective on future trends on TiO 2 -based photoanodes for PEC water splitting.
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Affiliation(s)
- Xiaoyan Zhang
- Shanghai University, Department of chemistry, No. 99, Road Shangda, 200444, Shanghai, CHINA
| | | | - Xiaoli Cui
- Fudan University, Department of Materials Science, CHINA
| | - Wei Zhou
- Shanghai University, Department of Chemistry, CHINA
| | - Weimin Cao
- Shanghai University, Department of Chemistry, CHINA
| | | | - Yi Sun
- Shanghai Aerospace Hydrogen Energy Technology Co. Ltd, Department of R & D, CHINA
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5
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Arzaee NA, Mohamad Noh MF, Aadenan A, Nawas Mumthas IN, Ab Hamid FF, Kamarudin NN, Mohamed NA, Ibrahim MA, Ismail AF, Mat Teridi MA. Accelerating the controlled synthesis of WO3 photoanode by modifying aerosol-assisted chemical vapour deposition for photoelectrochemical water splitting. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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6
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Kahng S, Kim JH. Heterojunction photoanode of SnO 2 and Mo-doped BiVO 4 for boosting photoelectrochemical performance and tetracycline hydrochloride degradation. CHEMOSPHERE 2022; 291:132800. [PMID: 34748804 DOI: 10.1016/j.chemosphere.2021.132800] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 11/01/2021] [Accepted: 11/03/2021] [Indexed: 06/13/2023]
Abstract
The photoelectrochemical (PEC) method has a potential to harvest solar energy for sustainable energy and degrade contaminants. Herein, we fabricated cauliflower-like SnO2 and porous Mo-doped BiVO4 (SnO2/Mo:BiVO4) photoelectrodes by a sol-gel spin-coating method for better PEC performance and higher degradability of tetracycline hydrochloride (TC-HCl). The SnO2 layer plays a crucial role in attaining a smooth and uniform surface of the photoanodes for blocking holes to defect trap sites and preventing charge recombination with improved light utilization. Mo dopants serve as nuclei for the crystallization of BiVO4 and for making charge-adjustable porous structures for PEC performance. Thus, the content-optimized SnO2/Mo:BiVO4 photoanode film presents the highest photocurrent density of 0.59 mA cm-2 at 1.23 VRHE of 82.1% TC-HCl decomposition efficiency within 120 min at a rate constant of 1.49 × 10-2 min-1, providing a promising method for green environmental applications.
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Affiliation(s)
- Soojin Kahng
- Department of Chemical Engineering, University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul, 02504, South Korea
| | - Jung Hyeun Kim
- Department of Chemical Engineering, University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul, 02504, South Korea.
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7
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Fang Y, Hou Y, Fu X, Wang X. Semiconducting Polymers for Oxygen Evolution Reaction under Light Illumination. Chem Rev 2022; 122:4204-4256. [PMID: 35025505 DOI: 10.1021/acs.chemrev.1c00686] [Citation(s) in RCA: 80] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Sunlight-driven water splitting to produce hydrogen fuel has stimulated intensive scientific interest, as this technology has the potential to revolutionize fossil fuel-based energy systems in modern society. The oxygen evolution reaction (OER) determines the performance of overall water splitting owing to its sluggish kinetics with multielectron transfer processing. Polymeric photocatalysts have recently been developed for the OER, and substantial progress has been realized in this emerging research field. In this Review, the focus is on the photocatalytic technologies and materials of polymeric photocatalysts for the OER. Two practical systems, namely, particle suspension systems and film-based photoelectrochemical systems, form two main sections. The concept is reviewed in terms of thermodynamics and kinetics, and polymeric photocatalysts are discussed based on three key characteristics, namely, light absorption, charge separation and transfer, and surface oxidation reactions. A satisfactory OER performance by polymeric photocatalysts will eventually offer a platform to achieve overall water splitting and other advanced applications in a cost-effective, sustainable, and renewable manner using solar energy.
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Affiliation(s)
- Yuanxing Fang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - Yidong Hou
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - Xianzhi Fu
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - Xinchen Wang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
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8
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Zhao G, Ding J, Zhou F, Zhao Q, Wang K, Chen X, Gao Q. Insight into a novel microwave-assisted W doped BiVO4 self-assembled sphere with rich oxygen vacancies oriented on rGO (W-BiVO4-x/rGO) photocatalyst for efficient contaminants removal. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119610] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Carminati SA, Rodríguez-Gutiérrez I, de Morais A, da Silva BL, Melo MA, Souza FL, Nogueira AF. Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting. RSC Adv 2021; 11:14374-14398. [PMID: 35424005 PMCID: PMC8698315 DOI: 10.1039/d0ra10176a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/31/2021] [Indexed: 12/02/2022] Open
Abstract
Graphene and its derivatives have emerged as potential materials for several technological applications including sunlight-driven water splitting reactions. This review critically addresses the latest achievements concerning the use of graphene as a player in the design of hybrid-photoelectrodes for photoelectrochemical cells. Insights about the charge carrier dynamics of graphene-based photocatalysts which include metal oxides and non-metal oxide semiconductors are also discussed. The concepts underpinning the continued progress in the field of graphene/photoelectrodes, including different graphene structures, architecture as well as the possible mechanisms for hydrogen and oxygen reactions are also presented. Despite several reports having demonstrated the potential of graphene-based photocatalysts, the achieved performance remains far from the targeted benchmark efficiency for commercial application. This review also highlights the challenges and opportunities related to graphene application in photoelectrochemical cells for future directions in the field.
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Affiliation(s)
- Saulo A Carminati
- Institute of Chemistry, University of Campinas (UNICAMP) PO Box 6154 Campinas São Paulo 13083-970 Brazil
| | - Ingrid Rodríguez-Gutiérrez
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC) Santo André São Paulo 09210-580 Brazil
- Brazilian Nanotechnology National Laboratory (LNNano) Campinas São Paulo 13083-970 Brazil
| | - Andreia de Morais
- Center for Information Technology Renato Archer (CTI Renato Archer) Rodovia D. Pedro I, km 143.6 13069-901 Campinas SP Brazil
| | - Bruno L da Silva
- Institute of Chemistry, University of Campinas (UNICAMP) PO Box 6154 Campinas São Paulo 13083-970 Brazil
| | - Mauricio A Melo
- Institute of Chemistry, Fluminense Federal University Outeiro de São João Batista, Campus do Valonguinho, Niterói Rio de Janeiro 24020-141 Brazil
| | - Flavio L Souza
- Institute of Chemistry, University of Campinas (UNICAMP) PO Box 6154 Campinas São Paulo 13083-970 Brazil
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC) Santo André São Paulo 09210-580 Brazil
- Brazilian Nanotechnology National Laboratory (LNNano) Campinas São Paulo 13083-970 Brazil
| | - Ana F Nogueira
- Institute of Chemistry, University of Campinas (UNICAMP) PO Box 6154 Campinas São Paulo 13083-970 Brazil
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10
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Rasouli H, Hosseini MG, Hosseini MM. Ta2O5-incorporated in photoinduced electrocatalyst of TiO2-RuO2 decorated by PPy-NrGO nanocomposite for boosting overall water splitting. J Colloid Interface Sci 2021; 582:254-269. [DOI: 10.1016/j.jcis.2020.08.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 08/06/2020] [Accepted: 08/07/2020] [Indexed: 12/16/2022]
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Sharma S, Kumar D, Khare N. Hierarchical PANI/ZnO nanocomposite: synthesis and synergistic effect of shape-selective ZnO nanoflowers and polyaniline sensitization for efficient photocatalytic dye degradation and photoelectrochemical water splitting. NANOTECHNOLOGY 2020; 31:465402. [PMID: 32764193 DOI: 10.1088/1361-6528/abad5b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Hierarchical nanoflowers (NFs) of zinc oxide (ZnO) have been synthesized in the hexagonal wurtzite structure by a facile hydrothermal method. Polyaniline (PANI) has been prepared by the chemical oxidative polymerization method and incorporated with ZnO NFs by the chemisorption method. The potential of the synthesized nanostructures has been demonstrated for efficient photocatalytic degradation of methylene blue (MB) and photoelectrochemical water splitting. The PANI/ZnO nanocomposite has exhibited the enhanced photocatalytic activity which is ∼9 fold higher in comparison to pristine ZnO NFs and enhanced photocurrent density which is ∼16 fold higher than the ZnO photoanode. Importantly, ∼4 fold increment in the incident photon-to-current conversion efficiency (IPCE) is exhibited by PANI/ZnO, than that of ZnO photoanode. The remarkably enhanced photocatalytic and photoelectrochemical performance of PANI/ZnO nanocomposite is attributed to the availability of more interfacial sites facilitated by the hierarchical ZnO NFs, improved overall photoresponse due to its photosensitization with PANI and the resulting type-II heterojunction between them, which helps in the efficient separation of photogenerated charge carriers at the interface. A plausible reaction mechanism for the substantially improved performance of nanostructured PANI/ZnO towards MB degradation and water splitting has also been elucidated.
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Affiliation(s)
- Surbhi Sharma
- Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
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12
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Shabdan Y, Markhabayeva A, Bakranov N, Nuraje N. Photoactive Tungsten-Oxide Nanomaterials for Water-Splitting. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1871. [PMID: 32962035 PMCID: PMC7557785 DOI: 10.3390/nano10091871] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/25/2020] [Accepted: 08/29/2020] [Indexed: 12/04/2022]
Abstract
This review focuses on tungsten oxide (WO3) and its nanocomposites as photoactive nanomaterials for photoelectrochemical cell (PEC) applications since it possesses exceptional properties such as photostability, high electron mobility (~12 cm2 V-1 s-1) and a long hole-diffusion length (~150 nm). Although WO3 has demonstrated oxygen-evolution capability in PEC, further increase of its PEC efficiency is limited by high recombination rate of photogenerated electron/hole carriers and slow charge transfer at the liquid-solid interface. To further increase the PEC efficiency of the WO3 photocatalyst, designing WO3 nanocomposites via surface-interface engineering and doping would be a great strategy to enhance the PEC performance via improving charge separation. This review starts with the basic principle of water-splitting and physical chemistry properties of WO3, that extends to various strategies to produce binary/ternary nanocomposites for PEC, particulate photocatalysts, Z-schemes and tandem-cell applications. The effect of PEC crystalline structure and nanomorphologies on efficiency are included. For both binary and ternary WO3 nanocomposite systems, the PEC performance under different conditions-including synthesis approaches, various electrolytes, morphologies and applied bias-are summarized. At the end of the review, a conclusion and outlook section concluded the WO3 photocatalyst-based system with an overview of WO3 and their nanocomposites for photocatalytic applications and provided the readers with potential research directions.
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Affiliation(s)
- Yerkin Shabdan
- National Laboratory Astana, Nazarbayev University, Nursultan 010000, Kazakhstan;
- Faculty of Physics and Technology, AI-Farabi Kazakh National University, Almaty 050040, Kazakhstan;
| | - Aiymkul Markhabayeva
- Faculty of Physics and Technology, AI-Farabi Kazakh National University, Almaty 050040, Kazakhstan;
| | - Nurlan Bakranov
- Faculty of General Education, Kazakh-British Technical University, Almaty 050000, Kazakhstan
- Laboratory of Engineering Profile, Satbayev University, Almaty 050000, Kazakhstan
| | - Nurxat Nuraje
- Department of Chemical and Materials Engineering, Nazarbayev University, Nursultan 010000, Kazakhstan
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Photoelectrochemical evaluation of SILAR-deposited nanoporous BiVO4 photoanodes for solar-driven water splitting. NANO MATERIALS SCIENCE 2020. [DOI: 10.1016/j.nanoms.2019.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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14
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Chen C, Lu Y, Fan R, Shen M. Integration of Oxygen-Vacancy-Rich NiFe-Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation. CHEMSUSCHEM 2020; 13:3893-3900. [PMID: 32400054 DOI: 10.1002/cssc.202000884] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/04/2020] [Indexed: 06/11/2023]
Abstract
Photoelectrochemical (PEC) water splitting has the potential to efficiently convert intermittent solar energy into storable hydrogen fuel. However, poor charge separation and transfer ability as well as sluggish surface oxygen evolution reaction (OER) kinetics of the photoelectrode severely hinder the advance in PEC performance. Herein, a facile electrodeposition method was used to integrate Mo-doped NiFe-layered double hydroxide onto a NiOx /Ni-protected Si photoanode for enhanced PEC water oxidation. Mo doping contributed to an increased amount of oxygen vacancies, whereas a dynamic surface self-reconstruction was induced by Mo leaching under PEC OER conditions. This led to enhanced PEC performance with an onset potential of 0.87 V vs. reversible hydrogen electrode (RHE), a photocurrent density of 39.3 mA cm-2 at 1.23 V vs. RHE, a fill factor of 0.38, and a solar-to-oxygen conversion efficiency of 5.3 %, along with a stability of 130 h continuous PEC reaction. The performance was superior to that of the undoped NiFe-LDH/NiOx /Ni/Si (4.3 %), which was attributed to the elevated interface charge separation, fast charge transfer, and accelerated OER kinetics.
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Affiliation(s)
- Cong Chen
- School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou, 215006, P.R. China
| | - Yao Lu
- School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou, 215006, P.R. China
| | - Ronglei Fan
- School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou, 215006, P.R. China
| | - Mingrong Shen
- School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou, 215006, P.R. China
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15
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Murali A, Sarswat PK, Free ML. Minimizing electron-hole pair recombination through band-gap engineering in novel ZnO-CeO 2-rGO ternary nanocomposite for photoelectrochemical and photocatalytic applications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:25042-25056. [PMID: 32342410 DOI: 10.1007/s11356-020-08990-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 04/22/2020] [Indexed: 05/27/2023]
Abstract
A novel ZnO-CeO2-rGO (ZCG) ternary nanocomposite with varying ZnO/CeO2 weight proportions was synthesized by a hydrothermal process for photoelectrochemical water splitting and photocatalytic application. XRD diffraction peaks of ZCG nanocomposites displayed the patterns of ZnO and CeO2 nanoparticles, and SEM revealed irregular flake-like particles, which were uniformly decorated on the rGO matrix. Increase in the intensity ratio of D and G bands from Raman spectra revealed changes in oxygen bonding in the ZnO-rGO (ZG) and ZCG nanocomposites. The shift in the band edge positions and the decrease in the band gap with increase in the cerium oxide content in ZCG composites were observed from UV-Vis and Mott-Schottky plots. XPS results showed that Ce3+ fraction increased with an increase in the cerium oxide content in ZCG nanocomposites. The ZCG3 (85:15) nanocomposite exhibited decreased electron-hole recombination rate as evidenced from the photoluminescence and electrochemical impedance spectroscopy Nyquist plots. The characteristic frequency in Bode's plot shifted to a lower frequency for the ZCG3 electrode demonstrating low interfacial charge transfer resistance, and ZCG3 photoelectrode displayed a higher photocurrent density of 0.69 mA/cm2 at 1.5 V compared with other photoelectrode. The optimized and highly efficient ZCG3 nanocomposite exhibited improved photocatalytic degradation of methylene blue (MB) with a reaction rate constant of 0.0201 min-1. Combination of defects in the form of Ce3+ ion and surface oxygen vacancies coupled with rGO as the electron acceptor improved the charge carrier density and carrier transport in addition to the formation Schottky-type junction and the presence of an internal electric field.
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Affiliation(s)
- Arun Murali
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT, 84112, USA.
| | - Prashant K Sarswat
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT, 84112, USA.
| | - Michael L Free
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT, 84112, USA
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16
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Synthesis of novel BiVO4/Cu2O heterojunctions for improving BiVO4 towards NO2 sensing properties. J Colloid Interface Sci 2020; 567:37-44. [PMID: 32035392 DOI: 10.1016/j.jcis.2020.01.104] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/14/2020] [Accepted: 01/27/2020] [Indexed: 11/22/2022]
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17
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Zhang M, Shi Q, Song X, Wang H, Bian Z. Recent electrochemical methods in electrochemical degradation of halogenated organics: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:10457-10486. [PMID: 30798495 DOI: 10.1007/s11356-019-04533-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 02/07/2019] [Indexed: 06/09/2023]
Abstract
Halogenated organics are widely used in modern industry, agriculture, and medicine, and their large-scale emissions have led to soil and water pollution. Electrochemical methods are attractive and promising techniques for wastewater treatment and have been developed for degradation of halogenated organic pollutants under mild conditions. Electrochemical techniques are classified according to main reaction pathways: (i) electrochemical reduction, in which cleavage of C-X (X = F, Cl, Br, I) bonds to release halide ions and produce non-halogenated and non-toxic organics and (ii) electrochemical oxidation, in which halogenated organics are degraded by electrogenerated oxidants. The electrode material is crucial to the degradation efficiency of an electrochemical process. Much research has therefore been devoted to developing appropriate electrode materials for practical applications. This paper reviews recent developments in electrode materials for electrochemical degradation of halogenated organics. And at the end of this paper, the characteristics of new combination methods, such as photocatalysis, nanofiltration, and the use of biochemical method, are discussed.
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Affiliation(s)
- Meng Zhang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China
| | - Qin Shi
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China
- School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530008, People's Republic of China
| | - Xiaozhe Song
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China
| | - Hui Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China.
| | - Zhaoyong Bian
- College of Water Sciences, Beijing Normal University, Beijing, 100875, Beijing, People's Republic of China.
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