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Yang XY, Chen ZW, Yue XZ, Du X, Hou XH, Zhang LY, Chen DL, Yi SS. Structural Engineering of BiVO 4 /CoFe MOF Heterostructures Boosting Charge Transfer for Efficient Photoelectrochemical Water Splitting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2205246. [PMID: 36581560 DOI: 10.1002/smll.202205246] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Boosting charge separation and transfer of photoanodes is crucial for providing high viability of photoelectrochemical hydrogen (H2 ) generation. Here, a structural engineering strategy is designed and synthesized for uniformly coating an ultrathin CoFe bimetal-organic framework (CoFe MOF) layer over a BiVO4 photoanode for boosted charge separation and transfer. The photocurrent density of the optimized BiVO4 /CoFe MOF(NA) photoanode reaches a value of 3.92 mA cm-2 at 1.23 V versus reversible hydrogen electrode (RHE), up to 6.03 times that of pristine BiVO4 , due to the greatly increased efficiency of charge transfer and separation. In addition, this photoanode records one onset potential that is considerably shifted negatively when compared to BiVO4 . Transient absorption spectroscopy reveals that the CoFe MOF(NA) prolongs charge recombination lifetime by blocking the hole-transfer pathway from the BiVO4 to its surface trap states. This work sheds light on boosting charge separation and transfer through structural engineering to enhance the photocurrent of photoanodes for solar H2 production.
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Affiliation(s)
- Xin-Yu Yang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Zong-Wei Chen
- Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450052, P. R. China
| | - Xin-Zheng Yue
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Xin Du
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Xing-Hui Hou
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Li-Ying Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - De-Liang Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Sha-Sha Yi
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
- Key Laboratory of Advanced Energy Catalytic and Functional Material Preparation of Zhengzhou City, Zhengzhou, 450012, P. R. China
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Kim N, Ju S, Ha J, Choi H, Sung H, Lee H. Hierarchical Co-Pi Clusters/Fe 2O 3 Nanorods/FTO Micropillars 3D Branched Photoanode for High-Performance Photoelectrochemical Water Splitting. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3664. [PMID: 36296855 PMCID: PMC9611282 DOI: 10.3390/nano12203664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 10/14/2022] [Accepted: 10/15/2022] [Indexed: 06/16/2023]
Abstract
In this study, an efficient hierarchical Co-Pi cluster/Fe2O3 nanorod/fluorine-doped tin oxide (FTO) micropillar three-dimensional (3D) branched photoanode was designed for enhanced photoelectrochemical performance. A periodic array of FTO micropillars, which acts as a highly conductive "host" framework for uniform light scattering and provides an extremely enlarged active area, was fabricated by direct printing and mist-chemical vapor deposition (CVD). Fe2O3 nanorods that act as light absorber "guest" materials and Co-Pi clusters that give rise to random light scattering were synthesized via a hydrothermal reaction and photoassisted electrodeposition, respectively. The hierarchical 3D branched photoanode exhibited enhanced light absorption efficiency because of multiple light scattering, which was a combination of uniform light scattering from the periodic FTO micropillars and random light scattering from the Fe2O3 nanorods. Additionally, the large surface area of the 3D FTO micropillar, together with the surface area provided by the one-dimensional Fe2O3 nanorods, contributed to a remarkable increase in the specific area of the photoanode. Because of these enhancements and further improvements facilitated by decoration with a Co-Pi catalyst that enhanced water oxidation, the 3D branched Fe2O3 photoanode achieved a photocurrent density of 1.51 mA cm-2 at 1.23 VRHE, which was 5.2 times higher than that generated by the non-decorated flat Fe2O3 photoanode.
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Affiliation(s)
- Nakhyun Kim
- Department of Semiconductor Systems Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
| | - Sucheol Ju
- Department of Materials Science and Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
| | - Jisung Ha
- Department of Materials Science and Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
| | - Hojung Choi
- Department of Materials Science and Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
| | - Hansang Sung
- Department of Materials Science and Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
| | - Heon Lee
- Department of Semiconductor Systems Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
- Department of Materials Science and Engineering, Korea University, Anam-ro 145, Sungbuk-gu, Seoul 136-701, Korea
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Effect of La2O3 on Microstructure and Properties of Laser Cladding SMA Coating on AISI 304 Stainless Steel. COATINGS 2022. [DOI: 10.3390/coatings12071004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Known as having a stress self-accommodation characteristic, the laser cladding shape memory alloy (SMA) coatings have been widely used in material failure repair. Nevertheless, their further development is greatly limited by their low microhardness (250 HV0.2) and corrosion resistance. Benefiting from the capability of refined grain and adjusted microstructure, rare earth oxides play a key role in improving the properties of materials. Herein, to improve the microhardness and anti-corrosion of laser cladding SMA coatings, different amounts of La2O3 were doped in SMA coating. The influence of the different La2O3 doping amounts on the phases, grain size and microhardness was studied. The anti-corrosion of the SMA/La2O3 composite coating was explored in 3.5 wt.% sodium chloride solution. Results showed that the grain of the SMA/La2O3 composite coating is significantly refined. When doping with 0.9 wt.%, the refinement rate reaches 19%. Furthermore, based on the Hall–Petch effect, the microhardness of the SMA/La2O3 composite coating is increased to 450 HV0.2. At the same time, the anti-corrosion of the composite coating is enhanced due to the smaller grain size and fewer defects.
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Wang Z, Zhu H, Tu W, Zhu X, Yao Y, Zhou Y, Zou Z. Host/Guest Nanostructured Photoanodes Integrated with Targeted Enhancement Strategies for Photoelectrochemical Water Splitting. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103744. [PMID: 34738739 PMCID: PMC8805576 DOI: 10.1002/advs.202103744] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/05/2021] [Indexed: 06/13/2023]
Abstract
Photoelectrochemical (PEC) hydrogen production from water splitting is a green technology that can solve the environmental and energy problems through converting solar energy into renewable hydrogen fuel. The construction of host/guest architecture in semiconductor photoanodes has proven to be an effective strategy to improve solar-to-fuel conversion efficiency dramatically. In host/guest photoanodes, the absorber layer is deposited onto a high-surface-area electron collector, resulting in a significant enhancements in light-harvesting as well as charge collection and separation efficiency. The present review aims to summarize and highlight recent state-of-the-art progresses in the architecture designing of host/guest photoanodes with integrated enhancement strategies, including i) light trapping effect; ii) optimization of conductive host scaffolds; iii) hierarchical structure engineering. The challenges and prospects for the future development of host/guest nanostructured photoanodes are also presented.
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Affiliation(s)
- Zhiwei Wang
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
- Hefei National Laboratory for Physical Sciences at the MicroscaleSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui230026P. R. China
| | - Heng Zhu
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
| | - Wenguang Tu
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
| | - Xi Zhu
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
| | - Yingfang Yao
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
- College of Engineering and Applied SciencesNanjing UniversityNanjingJiangsu210093P. R. China
| | - Yong Zhou
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
- Jiangsu Key Laboratory for Nano TechnologyNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjingJiangsu210093P. R. China
| | - Zhigang Zou
- School of Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong518172P. R. China
- Jiangsu Key Laboratory for Nano TechnologyNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjingJiangsu210093P. R. China
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Ouyang X, Feng C, Tang L, Zhu X, Peng B, Fan X, Liao Y, Zhou Z, Zhang Z. A flexible photoelectrochemical aptasensor using heterojunction architecture of α-Fe 2O 3/d-C 3N 4 for ultrasensitive detection of penbritin. Biosens Bioelectron 2021; 197:113734. [PMID: 34736113 DOI: 10.1016/j.bios.2021.113734] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 01/19/2023]
Abstract
The performance of photoelectrochemical (PEC) analysis system relies closely on the properties of the photoelectric electrodes. It is of great significance to integrate photoactive materials with flexible substrates to construct ultra-sensitive PEC sensors for practical application. This work reports a novel photoelectrode developed by immobilizing α-Fe2O3 nanoparticles (NPs)/defect-rich carbon nitride (d-C3N4), an excellent Z-scheme heterojunction photoelectric material, onto three-dimensional (3D) flexible carbon fiber textile. Specifically, 3D hierarchical structure of flexible carbon fiber textile provides larger specific surface area and higher mechanical strength than traditional electrodes, resulting in more reaction sites and faster reaction kinetics to achieve signal amplification. Simultaneously, α-Fe2O3/d-C3N4 Z-scheme heterojunction exhibits enhanced light absorption capability and high redox ability, thus dramatically improving the PEC performance. This photoelectrode was used to construct a flexible PEC aptasensor for ultrasensitive detection of penbritin, demonstrating excellent performance in terms of wide linear range (0.5 pM-50 nM), low detection limit (0.0125 pM) and high stability. The design principle is applicable to the manufacture of other photoelectric sensing systems, which provides an avenue for the development of portable environmental analysis and field diagnostics equipment.
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Affiliation(s)
- Xilian Ouyang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China
| | - Chengyang Feng
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Lin Tang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China.
| | - Xu Zhu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China
| | - Bo Peng
- College of Geographic Science, Hunan Normal University, Changsha, 410081, Hunan, China
| | - Xinyang Fan
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China
| | - Yibo Liao
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China
| | - Zheping Zhou
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China
| | - Ziling Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China
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