1
|
Kim S, Oh D, Jang JW. Unassisted Photoelectrochemical H 2O 2 Production with In Situ Glycerol Valorization Using α-Fe 2O 3. NANO LETTERS 2024; 24:5146-5153. [PMID: 38526525 DOI: 10.1021/acs.nanolett.3c05136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
Abstract
Photoelectrochemical (PEC) H2O2 production via two-electron O2 reduction is promising for H2O2 production without emitting CO2. For PEC H2O2 production, α-Fe2O3 is an ideal semiconductor owing to its earth abundance, superior stability in water, and an appropriate band gap for efficient solar light utilization. Moreover, its conduction band is suitable for O2 reduction to produce H2O2. However, a significant overpotential for water oxidation is required due to the poor surface properties of α-Fe2O3. Thus, unassisted solar H2O2 production is not yet possible. Herein, we demonstrate unassisted PEC H2O2 production using α-Fe2O3 for the first time by applying glycerol oxidation, which requires less bias compared with water oxidation. We obtain maximum Faradaic efficiencies of 96.89 ± 0.6% and 100% for glycerol oxidation and H2O2 production, respectively, with high stability for 25 h. Our results indicate that unassisted and stable PEC H2O2 production is feasible with in situ glycerol valorization using the α-Fe2O3 photoanode.
Collapse
Affiliation(s)
- Sarang Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Dongrak Oh
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Ji-Wook Jang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
- Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
- Emergent Hydrogen Technology R&D Centre, UNIST, Ulsan 44919, Republic of Korea
| |
Collapse
|
2
|
Liu Y, Lei J, Chen Y, Liang C, Ni J. Hierarchical-Structured Fe 2O 3 Anode with Exposed (001) Facet for Enhanced Lithium Storage Performance. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2025. [PMID: 37446541 DOI: 10.3390/nano13132025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 06/30/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023]
Abstract
The hierarchical structure is an ideal nanostructure for conversion-type anodes with drastic volume expansion. Here, we demonstrate a tin-doping strategy for constructing Fe2O3 brushes, in which nanowires with exposed (001) facets are stacked into the hierarchical structure. Thanks to the tin-doping, the conductivity of the Sn-doped Fe2O3 has been improved greatly. Moreover, the volume changes of the Sn-doped Fe2O3 anodes can be limited to ~4% vertical expansion and ~13% horizontal expansion, thus resulting in high-rate performance and long-life stability due to the exposed (001) facet and the unique hierarchical structure. As a result, it delivers a high reversible lithium storage capacity of 580 mAh/g at a current density of 0.2C (0.2 A/g), and excellent rate performance of above 400 mAh/g even at a high current density of 2C (2 A/g) over 500 cycles, which is much higher than most of the reported transition metal oxide anodes. This doping strategy and the unique hierarchical structures bring inspiration for nanostructure design of functional materials in energy storage.
Collapse
Affiliation(s)
- Yanfei Liu
- Longmen Laboratory, School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Jianfei Lei
- Longmen Laboratory, School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Ying Chen
- Longmen Laboratory, School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Chenming Liang
- Longmen Laboratory, School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Jing Ni
- School of Chemistry and Material Science, Hubei Engineering University, Xiaogan 432000, China
| |
Collapse
|
3
|
Mao L, Huang YC, Deng H, Meng F, Fu Y, Wang Y, Li M, Zhang Q, Dong CL, Gu L, Shen S. Synergy of Ultrathin CoO x Overlayer and Nickel Single Atoms on Hematite Nanorods for Efficient Photo-Electrochemical Water Splitting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2203838. [PMID: 36511178 DOI: 10.1002/smll.202203838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 11/08/2022] [Indexed: 06/17/2023]
Abstract
To solve surface carrier recombination and sluggish water oxidation kinetics of hematite (α-Fe2 O3 ) photoanodes, herein, an attractive surface modification strategy is developed to successively deposit ultrathin CoOx overlayer and Ni single atoms on titanium (Ti)-doped α-Fe2 O3 (Ti:Fe2 O3 ) nanorods through a two-step atomic layer deposition (ALD) and photodeposition process. The collaborative decoration of ultrathin CoOx overlayer and Ni single atoms can trigger a big boost in photo-electrochemical (PEC) performance for water splitting over the obtained Ti:Fe2 O3 /CoOx /Ni photoanode, with the photocurrent density reaching 1.05 mA cm-2 at 1.23 V vs. reversible hydrogen electrode (RHE), more than three times that of Ti:Fe2 O3 (0.326 mA cm-2 ). Electrochemical and electronic investigations reveal that the surface passivation effect of ultrathin CoOx overlayer can reduce surface carrier recombination, while the catalysis effect of Ni single atoms can accelerate water oxidation kinetics. Moreover, theoretical calculations evidence that the synergy of ultrathin CoOx overlayer and Ni single atoms can lower the adsorption free energy of OH* intermediates and relieve the potential-determining step (PDS) for oxygen evolution reaction (OER). This work provides an exemplary modification through rational engineering of surface electrochemical and electronic properties for the improved PEC performances, which can be applied in other metal oxide semiconductors as well.
Collapse
Affiliation(s)
- Lianlian Mao
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi, 710049, China
| | - Yu-Cheng Huang
- Department of Physics, Tamkang University, New Taipei City, 25137, Taiwan
| | - Hao Deng
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi, 710049, China
| | - Fanqi Meng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Yanming Fu
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi, 710049, China
| | - Yiqing Wang
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi, 710049, China
| | - Mingtao Li
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi, 710049, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Chung-Li Dong
- Department of Physics, Tamkang University, New Taipei City, 25137, Taiwan
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Shaohua Shen
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shaanxi, 710049, China
| |
Collapse
|
4
|
Ma H, Chen W, Fan Q, Ye C, Zheng M, Wang J. Regulating Sn self-doping and boosting solar water splitting performance of hematite nanorod arrays grown on fluorine-doped tin oxide via low-level Hf doping. J Colloid Interface Sci 2022; 625:585-595. [PMID: 35751984 DOI: 10.1016/j.jcis.2022.06.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 06/02/2022] [Accepted: 06/12/2022] [Indexed: 11/16/2022]
Abstract
Hematite (α-Fe2O3) nanorod arrays grown on fluorine-doped tin oxide (FTO) substrate exhibit outstanding solar water splitting efficiency, benefiting from Sn self-doping induced by high-temperature annealing. However, this Sn self-doping couldn't be freely controlled without changing the optimized annealing conditions, which limits the further improvement of their photoelectrochemical (PEC) properties. Here, we report a facile hydrothermal synthesis with subsequent annealing approach to regulate the Sn diffusion via hafnium (Hf) doping as well as enhance the PEC performance of hematite photoanode. Upon increasing the Hf doping concentration, the Sn self-doping content was continuously suppressed. The very low doping-level of Hf (i.e., atomic Hf/Fe = 0.13 ∼ 1.54%) was sufficient for enhancing the electrical conductivity. The Hf-doped α-Fe2O3 with the optimized dopant concentration (Hf/Fe = 1.34%, denoted as 0.25-Hf-Fe2O3) showed a photocurrent density of 1.79 mA/cm2 at 1.23 V vs. RHE, 70% higher than that of the Sn self-doped one (Pristine-Fe2O3). The donor density of 0.25-Hf-Fe2O3 increased 2.5 times compared to Pristine-Fe2O3 while its space-charge resistance and charge transfer resistance declined by 40% and 22%, respectively, verifying Hf doping improves the charge carrier density and accelerates the charge transfer for solar water oxidation. We offered here a prospective dopant alternative for preparing superior hematite-based photoanode.
Collapse
Affiliation(s)
- Haiqing Ma
- College of Materials Science and Engineering, Shenzhen University, Shenzhen 518071, China; College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Wenxiao Chen
- College of Materials Science and Engineering, Shenzhen University, Shenzhen 518071, China
| | - Qikui Fan
- College of Materials Science and Engineering, Shenzhen University, Shenzhen 518071, China
| | - Chenliang Ye
- College of Materials Science and Engineering, Shenzhen University, Shenzhen 518071, China
| | - Meng Zheng
- College of Materials Science and Engineering, Shenzhen University, Shenzhen 518071, China.
| | - Jin Wang
- College of Materials Science and Engineering, Shenzhen University, Shenzhen 518071, China.
| |
Collapse
|
5
|
Zhang S, Deng P, Yu L, Ni Y, Ling C, Zhu Z, Liu R. Fabrication and Formation Mechanism of Hollow-Structure Supermagnetic α-Fe2O3/Fe3O4 Heterogeneous Nanospindles. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02328-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
6
|
Lee MG, Yang JW, Kwon HR, Jang HW. Crystal facet and phase engineering for advanced water splitting. CrystEngComm 2022. [DOI: 10.1039/d2ce00585a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review covers the principles and recent advances in facet and phase engineering of catalysts for photocatalytic, photoelectrochemical, and electrochemical water splitting. It suggests the basis of catalyst design for advanced water splitting.
Collapse
Affiliation(s)
- Mi Gyoung Lee
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 1A4, Canada
| | - Jin Wook Yang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hee Ryeong Kwon
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea
| |
Collapse
|
7
|
TEA driven C, N co-doped superfine Fe 3O 4 nanoparticles for efficient trifunctional electrode materials. J Colloid Interface Sci 2021; 609:249-259. [PMID: 34906910 DOI: 10.1016/j.jcis.2021.11.182] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 11/26/2021] [Accepted: 11/28/2021] [Indexed: 11/23/2022]
Abstract
Poor conductivity is an obstacle that restricts the development of the electrochemistry performance of Fe3O4. In this work, a novel carbon and nitrogen co-doped ultrafine Fe3O4 nanoparticles (CN-Fe3O4) have been synthesized by triethylamine (TEA) induction and subsequent calcination. The addition of TEA could not only regulate the size of Fe3O4 nanoparticles, but also promote the formation of amorphous carbon layer. Well-designed CN-Fe3O4 heterostructures provide a highly interconnected porous conductive network, large heterogeneous interface area, large specific surface area and a large number of active sites, which greatly improve conductivity and promote electron transfer and electrolyte diffusion. The prepared CN-Fe3O4 electrode exhibits a high specific capacitance of 399.3 mF cm-2 and good cycling stability. Meanwhile, CN-Fe3O4 catalyst exhibits excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities, with overpotentials of 136 and 281 mV at the current density of 10 mA cm-2, respectively. This work provides a promising approach for the design of high-performance anode materials for supercapacitors and provides profound implications for the development of catalysts with bifunctional catalytic activity.
Collapse
|
8
|
Park J, Yoon KY, Kwak MJ, Lee JE, Kang J, Jang JH. Sn-Controlled Co-Doped Hematite for Efficient Solar-Assisted Chargeable Zn-Air Batteries. ACS APPLIED MATERIALS & INTERFACES 2021; 13:54906-54915. [PMID: 34751554 DOI: 10.1021/acsami.1c13872] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The photoelectrochemical performance of a co-doped hematite photoanode might be hindered due to the unintentionally diffused Sn from a fluorine-doped tin oxide (FTO) substrate during the high-temperature annealing process by providing an increased number of recombination centers and structural disorder. We employed a two-step annealing process to manipulate the Sn concentration in co-doped hematite. The Sn content [Sn/(Sn + Fe)] of a two-step annealing sample decreased to 1.8 from 6.9% of a one-step annealing sample. Si and Sn co-doped hematite with the reduced Sn content exhibited less structural disorder and improved charge transport ability to achieve a 3.0 mA cm-2 photocurrent density at 1.23 VRHE, which was 1.3-fold higher than that of the reference Si and Sn co-doped Fe2O3 (2.3 mA cm-2). By decorating with the efficient co-catalyst NiFe(OH)x, a maximum photocurrent density of 3.57 mA cm-2 was achieved. We further confirmed that the high charging potential and poor cyclability of the zinc-air battery could be dramatically improved by assembling the optimized, stable, and low-cost hematite photocatalyst with excellent OER performance as a substitute for expensive Ir/C in the solar-assisted chargeable battery. This study demonstrates the significance of manipulating the unintentionally diffused Sn content diffused from FTO to maximize the OER performance of the co-doped hematite.
Collapse
Affiliation(s)
- Juhyung Park
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Ki-Yong Yoon
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Myung-Jun Kwak
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Jae-Eun Lee
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Jihun Kang
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Ji-Hyun Jang
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| |
Collapse
|
9
|
Li M, Liu H, Pang S, Yan P, Liu M, Ding M, Zhang B. Facile Fabrication of Three-Dimensional Fusiform-Like α-Fe 2O 3 for Enhanced Photocatalytic Performance. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2650. [PMID: 34685091 PMCID: PMC8539989 DOI: 10.3390/nano11102650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/30/2021] [Accepted: 10/06/2021] [Indexed: 11/17/2022]
Abstract
α-Fe2O3 fusiform nanorods were prepared by a simple hydrothermal method employing the mixture of FeCl3·6H2O and urea as raw materials. The samples were examined by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and UV-vis diffuse reflectance spectra (UV-DRS). Its visible-light photocatalytic performances were evaluated by photocatalytic decolorization methylene blue (MB) in visible light irradiation. It was found that pure phase α-Fe2O3 nanorods with a length of about 125 nm and a diameter of 50 nm were successfully synthesized. The photocatalytic decolorization of MB results indicated that α-Fe2O3 nanorods showed higher photocatalytic activity than that of commercial Fe2O3 nanoparticles-these are attributed to its unique three-dimensional structure and lower electron-hole recombination rate.
Collapse
Affiliation(s)
- Moyan Li
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
- Key Laboratory of Super Light Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
- Institute of Surface/Interface Science and Technology, Harbin Engineering University, Harbin 150001, China
| | - Hongjin Liu
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
| | - Shaozhi Pang
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
| | - Pengwei Yan
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
| | - Mingyang Liu
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
| | - Minghui Ding
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
- Key Laboratory of Super Light Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
- Institute of Surface/Interface Science and Technology, Harbin Engineering University, Harbin 150001, China
| | - Bin Zhang
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; (M.L.); (H.L.); (S.P.); (P.Y.); (B.Z.)
- Key Laboratory of Super Light Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
- Institute of Surface/Interface Science and Technology, Harbin Engineering University, Harbin 150001, China
| |
Collapse
|
10
|
Park S, Anggraini TM, Chung J, Kang PK, Lee S. Microfluidic pore model study of precipitates induced by the pore-scale mixing of an iron sulfate solution with simulated groundwater. CHEMOSPHERE 2021; 271:129857. [PMID: 33736220 DOI: 10.1016/j.chemosphere.2021.129857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 01/27/2021] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
Precipitates induced by the pore-scale mixing of iron sulfate solutions with simulated groundwater were investigated using a microfluidic pore model to assess the environmental impacts of the infiltration of acid mine drainage into a shallow aquifer. This model was employed to visualize the formation of precipitates in a porous network and to evaluate their physicochemical influences on pore flow. Four types of groundwater (Na-HCO3, Na-SO4, Na-Cl, and Ca-Cl) were evaluated, and precipitation rates were calculated by processing images of precipitates in the pores captured via microscopy. The results showed that all groundwater types formed a yellow-brownish precipitate at the interface of the iron solution and simulated groundwater flow. Microscopic X-ray analyses demonstrated that precipitate morphology varied with groundwater type. Faster precipitation was observed in the following order by groundwater type: Na-HCO3 > Na-Cl > Na-SO4 > Ca-Cl, which was attributed to the different stability constants of the major anions in each simulated groundwater with Fe ions. Chemical equilibrium models suggested that precipitates were Fe minerals, with FeOOH as the predominant form consistent with the results of X-ray photoelectron spectrometry. The presence of FeOOH implies that precipitates may serve as an effective sorption barrier against some nutrients and heavy metals for the underlying groundwater. However, dye-flow experiments suggested that the precipitates may clog aquifer pores, thereby altering hydrogeological properties in the aquifer.
Collapse
Affiliation(s)
- Saerom Park
- Urban Water Circulation Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT), Gyeonggi-do, 10223, Republic of Korea
| | - Theresia May Anggraini
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea; Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, Seoul, 02792, Republic of Korea
| | - Jaeshik Chung
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Peter K Kang
- Department of Earth and Environmental Sciences, University of Minnesota, Twin Cities, Minneapolis, MN, 55455, United States
| | - Seunghak Lee
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea; Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, Seoul, 02792, Republic of Korea.
| |
Collapse
|
11
|
Hong DH, Reddy DA, Reddy KAJ, Gopannagari M, Kumar DP, Kim TK. Synergetic catalytic behavior of dual metal-organic framework coated hematite photoanode for photoelectrochemical water splitting performance. J Catal 2020. [DOI: 10.1016/j.jcat.2020.09.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
12
|
Cai J, Chen H, Liu C, Yin S, Li H, Xu L, Liu H, Xie Q. Engineered Sn- and Mg-doped hematite photoanodes for efficient photoelectrochemical water oxidation. Dalton Trans 2020; 49:11282-11289. [PMID: 32760974 DOI: 10.1039/c9dt03962g] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A feasible and cost-effective method was developed to improve the photoelectrochemical performance of the hematite (α-Fe2O3) photoanode. Using a hydrothermal method, tin (Sn) and magnesium (Mg) (co-)doped hematite films were prepared and characterized by X-ray diffraction (XRD), X-ray photon spectroscopy (XPS), and Raman spectroscopy. The average particle size of the α-Fe2O3 film varied from 150 to 300 nm. The photocurrent density of Sn-/Mg-co-doped α-Fe2O3 reached a maximum of 1.1 mA cm-2 at 1.23 VRHE, which increased approximately 3 times compared to that of pristine α-Fe2O3. It also yielded a maximum applied bias photon-to-current efficiency (ABPE) of 0.09% at 1.08 V vs. RHE. The excellent PEC activity could be attributed to Mg co-doping relieving the lattice distortion caused by Sn doping, and improving both the charge injection efficiency and charge separation efficiency without obviously changing the carrier concentration, which was proved by electrochemical impedance spectroscopy. This promising co-doping strategy could also be extended to other candidatephotoelectrodes.
Collapse
Affiliation(s)
- Jiajia Cai
- School of Energy and Environment, Anhui University of Technology, Ma'anshan, Anhui 243002, China
| | - Hao Chen
- College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Cunxing Liu
- School of Energy and Environment, Anhui University of Technology, Ma'anshan, Anhui 243002, China
| | - Shuaiqi Yin
- Zhongtian Iron and Steel Group Co., Ltd, No. 2 Steelmaking branch, Changzhou, Jiangsu 213011, China
| | - Haijin Li
- School of Energy and Environment, Anhui University of Technology, Ma'anshan, Anhui 243002, China
| | - Liangcheng Xu
- School of Energy and Environment, Anhui University of Technology, Ma'anshan, Anhui 243002, China
| | - Hao Liu
- School of Energy and Environment, Anhui University of Technology, Ma'anshan, Anhui 243002, China
| | - Qian Xie
- School of Metallurgic Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
| |
Collapse
|
13
|
Xiao C, Zhou Z, Li L, Wu S, Li X. Tin and Oxygen-Vacancy Co-doping into Hematite Photoanode for Improved Photoelectrochemical Performances. NANOSCALE RESEARCH LETTERS 2020; 15:54. [PMID: 32130553 PMCID: PMC7056762 DOI: 10.1186/s11671-020-3287-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 02/21/2020] [Indexed: 05/17/2023]
Abstract
Hematite (α-Fe2O3) material is regarded as a promising candidate for solar-driven water splitting because of the low cost, chemical stability, and appropriate bandgap; however, the corresponding system performances are limited by the poor electrical conductivity, short diffusion length of minority carrier, and sluggish oxygen evolution reaction. Here, we introduce the in situ Sn doping into the nanoworm-like α-Fe2O3 film with ultrasonic spray pyrolysis method. We show that the current density at 1.23 V vs. RHE (Jph@1.23V) under one-sun illumination can be improved from 10 to 130 μA/cm2 after optimizing the Sn dopant density. Moreover, Jph@1.23V can be further enhanced 25-folds compared to the untreated counterpart via the post-rapid thermal process (RTP), which is used to introduce the defect doping of oxygen vacancy. Photoelectrochemical impedance spectrum and Mott-Schottky analysis indicate that the performance improvement can be ascribed to the increased carrier density and the decreased resistances for the charge trapping on the surface states and the surface charge transferring into the electrolyte. X-ray photoelectron spectrum and X-ray diffraction confirm the existence of Sn and oxygen vacancy, and the potential influences of varying levels of Sn doping and oxygen vacancy are discussed. Our work points out one universal approach to efficiently improve the photoelectrochemical performances of the metal oxide semiconductors.
Collapse
Affiliation(s)
- Chenhong Xiao
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, Jiangsu, China
- Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, Jiangsu, China
| | - Zhongyuan Zhou
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, Jiangsu, China
- Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, Jiangsu, China
| | - Liujing Li
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, Jiangsu, China
- Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, Jiangsu, China
| | - Shaolong Wu
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, Jiangsu, China.
- Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, Jiangsu, China.
| | - Xiaofeng Li
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, Jiangsu, China.
- Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, Jiangsu, China.
| |
Collapse
|
14
|
Xia W, Sun J, Zeng X, Wang P, Luo M, Dong J, Yu H. FeO-Based Hierarchical Structures on FTO Substrates and Their Photocurrent. ACS OMEGA 2020; 5:2205-2213. [PMID: 32064381 PMCID: PMC7016909 DOI: 10.1021/acsomega.9b03197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 01/09/2020] [Indexed: 06/10/2023]
Abstract
As one of the most promising photoanode materials for photoelectrochemical (PEC) water oxidation, earth-abundant hematite has been severely restricted by its poor electrical conductivity, poor charge separation, and sluggish oxygen evolution reaction kinetics. FeO has an ability to produce hydrogen, while its preparation needs high temperature to reduce Fe3+ to Fe2+ by using H2 or CO gases. Here, Fe2O3- and FeO-based nanorods (NRs) on fluorine-doped tin oxide (FTO) substrate have been prepared, where the latter was obtained by doping Sn4+ ions in FeOOH to reduce Fe3+ ions to Fe2+. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements indicate that the dominant content of Fe element on the surface of Sn-doped Fe2O3 and Sn-FeOOH samples is Fe2+. FeO-based NRs have a Fe3O2/FeO heterostructure with some SnO2 nanoparticles distributed on their surface. These prepared samples were used as PEC photoanodes under a visible-light irradiation. The results showed that the modified FeO-based NRs have a photocurrent density of 0.2 mA cm-2 at 1.23 V vs reference hydrogen electrode (RHE) using Hg/HgO electrode as the reference electrode. Furthermore, they also have a better photocatalytic hydrogen evolution activity with a rate of 2.3 μmol h-1 cm-1. The improved photocurrent and photocatalytic activity can be ascribed to the Sn-dopant, as the introduction of Sn4+ not only leads to the formation of the Fe3O2/FeO heterostructure but also increases the carrier concentration. Fe3O2/FeO heterostructure with SnO2 nanoparticles on its surface has a good band energy alignment, which is beneficial to the PEC water oxidation and reduction.
Collapse
Affiliation(s)
- Weiwei Xia
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Jiawei Sun
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Xianghua Zeng
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
- College
of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, P. R. China
| | - Pengdi Wang
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Min Luo
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Jing Dong
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
- College
of Chemistry and Chemical Engineering, Yangzhou
University, Yangzhou 225002, P. R. China
| | - Huaguang Yu
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology, Yangzhou University, Yangzhou 225002, P. R. China
| |
Collapse
|
15
|
Ma H, Kwon JA, Mahadik MA, Kim S, Lee HH, Choi SH, Chae WS, Lim DH, Jang JS. Effect of Sn-self diffusion via H 2 treatment on low temperature activation of hematite photoanodes. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00763c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A simple approach of lowering the activation temperature for hematite photoanode was developed. H2 treatment and air quenching allows Sn4+ diffusion from FTO to hematite which exhibited the photocurrent density of 1.17 mA cm−2 at 1.23 V vs. RHE.
Collapse
Affiliation(s)
- Haiqing Ma
- Division of Biotechnology
- Advanced Institute of Environmental and Bioscience
- College of Environmental and Bioresource Sciences
- Chonbuk National University
- Iksan 570-752
| | - Jeong An Kwon
- Department of Environmental Engineering
- Chungbuk National University
- Cheongju
- Republic of Korea
| | - Mahadeo A. Mahadik
- Division of Biotechnology
- Advanced Institute of Environmental and Bioscience
- College of Environmental and Bioresource Sciences
- Chonbuk National University
- Iksan 570-752
| | - Sarang Kim
- Division of Biotechnology
- Advanced Institute of Environmental and Bioscience
- College of Environmental and Bioresource Sciences
- Chonbuk National University
- Iksan 570-752
| | - Hyun Hwi Lee
- Pohang Accelerator Laboratory (PAL)
- Pohang University of Science and Technology (POSTECH)
- Pohang 37673
- Republic of Korea
| | - Sun Hee Choi
- Pohang Accelerator Laboratory (PAL)
- Pohang University of Science and Technology (POSTECH)
- Pohang 37673
- Republic of Korea
| | - Weon-Sik Chae
- Korea Basic Science Institute, Daegu Center
- Daegu 41566
- Republic of Korea
| | - Dong-Hee Lim
- Department of Environmental Engineering
- Chungbuk National University
- Cheongju
- Republic of Korea
| | - Jum Suk Jang
- Division of Biotechnology
- Advanced Institute of Environmental and Bioscience
- College of Environmental and Bioresource Sciences
- Chonbuk National University
- Iksan 570-752
| |
Collapse
|
16
|
Li Y, Liu Z, Ruan M, Guo Z, Li X. 1D WO 3 Nanorods/2D WO 3-x Nanoflakes Homojunction Structure for Enhanced Charge Separation and Transfer towards Efficient Photoelectrochemical Performance. CHEMSUSCHEM 2019; 12:5282-5290. [PMID: 31659855 DOI: 10.1002/cssc.201902572] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 10/23/2019] [Indexed: 06/10/2023]
Abstract
Designing and fabricating photoelectrodes with low carrier recombination, high carrier transfer, and high light-capture capability is of great significance for achieving effective photoelectrochemical (PEC) water splitting. Herein, for the first time, 2D nonstoichiometric WO3-x nanoflakes (NFs) were vertically grown by hydrothermal synthesis on 1D WO3 nanorods (NRs) obtained by a hydrothermal method and high-temperature annealing (HTA). In this 1D HTA-WO3 /2D WO3-x photoanode, the 2D WO3-x NFs with active areas could maximize light harvesting, and the unique 1D/2D homojunction structure could improve the carrier-separation efficiency. At the same time, the 1D WO3 NRs with high aspect ratio were more beneficial to charge transfer after HTA. As expected, the 1D HTA-WO3 /2D WO3-x photoanode yielded an enhanced photocurrent density of 0.98 mA cm-2 at 1.23 V versus reversible hydrogen electrode, which is approximately 3.16 times that of pristine WO3 . The improvement could be attributed to the synergistic effect of HTA and the homojunction structure in the 1D HTA-WO3 /2D WO3-x photoanode, which could effectively improve carrier separation and transfer. Furthermore, this work may provide a promising strategy for the design and fabrication of semiconductor-based photoelectrodes.
Collapse
Affiliation(s)
- Yanting Li
- School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin, 300384, P. R. China
| | - Zhifeng Liu
- School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin, 300384, P. R. China
- Tianjin Key Laboratory of Building Green Functional Materials, Tianjin, 300384, P. R. China
- Key Laboratory for Photonic and Electric Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin, 150025, P. R. China
| | - Mengnan Ruan
- School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin, 300384, P. R. China
- Tianjin Key Laboratory of Building Green Functional Materials, Tianjin, 300384, P. R. China
| | - Zhengang Guo
- School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin, 300384, P. R. China
- Tianjin Key Laboratory of Building Green Functional Materials, Tianjin, 300384, P. R. China
| | - Xifei Li
- Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, 710048, P. R. China
| |
Collapse
|
17
|
Subramanian A, Mahadik MA, Park JW, Jeong IK, Chung HS, Lee HH, Choi SH, Chae WS, Jang JS. An effective strategy to promote hematite photoanode at low voltage bias via Zr4+/Al3+ codoping and CoOx OER co-catalyst. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.06.149] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
18
|
In-situ Reduction Synthesis of Bi/BiOI Heterostructure Films with High Photoelectrochemical Activity. Chem Res Chin Univ 2019. [DOI: 10.1007/s40242-019-9023-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|