期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800101
关键词
metal-organic frameworks (MOFs); photo-electrochemical (PEC); surface passivation; water oxidation; ZnO nanorod arrays
类别
资金
- National Natural Science Foundation of China [51372056, 51572209, 51672057, 51722205]
- International Science AMP
- Technology Cooperation Program of China [2012DFR50020]
- Program for New Century Excellent Talents in University [NCET-13-0174]
- National Key Research and Development Program [2016YFC0204800]
- Start-up Funds for High-Level Talents of Sun Yat-sen University [38000-31131103]
- Fundamental Research Funds for the Central Universities [16lgjc64]
- Science and Technology Program of Guangzhou [201707010095]
This study introduces zeolitic imidazolate framework-8 (ZIF-8) as the first metal-organic framework based transparent surface passivation layer for photo-electrochemical (PEC) water splitting. A significant enhancement for PEC water oxidation is demonstrated based on the in situ seamless coating of ZIF-8 surface passivation layer on Ni foam (NF) supported ZnO nanorod arrays photoanode. The PEC performance is improved by optimizing the ZIF-8 thickness and by grafting Ni(OH)(2) nanosheets as synergetic co-catalyst. With respect to ZnO/NF, the optimized Ni(OH)(2)/ZIF-8/ZnO/NF photoanode exhibits a two times larger photocurrent density of 1.95 mA cm(-2) and also a two times larger incident photon to current conversion efficiency of 40.05% (350 nm) at 1.23 V versus RHE (VRHE) under AM 1.5 G. The synergetic surface passivation and the co-catalyst modification contribute to prolonging the charge lifetime, to promoting the charge transfer, and to decreasing the overpotential for water oxidation.
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