期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 47, 页码 17699-17702出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja4094764
关键词
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资金
- DOE/LBNL [403801]
- DoE/LBNL Helios Solar Energy Research Center [51HE112B]
- US DOE, Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Program
- KAU
- Advanced Light Source, Berkeley [DE-AC02-05CH11231]
A cobalt-sulfide (Co-S) film prepared via electrochemical deposition on conductive substrates is shown to behave as an efficient and robust catalyst for electrochemical and photoelectrochemical hydrogen generation from neutral pH water. Electrochemical experiments demonstrate that the film exhibits a low catalytic onset overpotential (eta) of 43 mV, a Tafel slope of 93 mV/dec, and near 100% Faradaic efficiency in pH 7 phosphate buffer. Catalytic current densities can approach 50 mA/cm(2) and activity is maintained for at least 40 h. The catalyst can also be electrochemically coated on silicon, rendering a water-compatible photoelectrochemical system for hydrogen production under simulated 1 sun illumination. The facile preparation of this Co-S film, along with its low overpotential, high activity, and long-term aqueous stability, offer promising features for potential use in solar energy applications.
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