Electrodeposited Cobalt-Sulfide Catalyst for Electrochemical and Photoelectrochemical Hydrogen Generation from Water

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...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2013-11, Vol.135 (47), p.17699-17702
Main Authors: Sun, Yujie, Liu, Chong, Grauer, David C, Yano, Junko, Long, Jeffrey R, Yang, Peidong, Chang, Christopher J
Format: Article
Language:English
Subjects:
Catalysis
Cobalt - chemistry
Electrochemical Techniques
Electroplating
Hydrogen - chemistry
Photochemical Processes
Water - chemistry
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Summary: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 (η) 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/cm2 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.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja4094764