期刊
ADVANCED ENERGY MATERIALS
卷 6, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201501758
关键词
cobalt phosphide; electrocatalysis; hydrogen evolution; photoelectrochemical water splitting; silicon photocathodes
类别
资金
- National Science Foundation [CBET-1433442]
- National Science Foundation
- Division of Chemical
- Bioengineering, Environmental
- Transport Systems (CBET)
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office
- National Science Foundation Graduate Research Fellowship Program
- Stanford Graduate Fellowship
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences for SUNCAT Center for Interface Science and Catalysis
- National Science Foundation through National Nanotechnology Infrastructure Network [ECS-9731293]
Transition metal phosphide catalysts have recently emerged as active, earth abundant alternatives to precious metals for the hydrogen evolution reaction in acid. High performance, scalable catalysts are necessary for the successful implementation of photoelectrochemical water splitting devices, which have the potential to generate hydrogen in a sustainable manner. Herein, a general synthetic route is reported to produce transition metal phosphide thin films, which is used to fabricate cobalt phosphide (CoP) catalysts with high average turnover frequency (TOFavg), 0.48 H-2 s(-1) and 1.0 H-2 s(-1) at 100 and 120 mV overpotential, respectively. Furthermore, it is shown that CoP thin films can be applied to silicon photoabsorbers to generate one of the most active precious metal-free crystalline silicon photocathodes to date, achieving -10 mA cm(-2) at +0.345 V vs. reversible hydrogen electrode. The synthesis route presented here provides a platform for both fundamental studies of well-defined electrocatalysts and the fabrication of high-performance photoelectrodes.
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