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

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• 作者：Yujie Sun ; Chong Liu ; David C. Grauer ; Junko Yano ; Jeffrey R. Long ; Peidong Yang ; Christopher J. Chang
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：November 27, 2013
• 年：2013
• 卷：135
• 期：47
• 页码：17699-17702
• 全文大小：277K
• 年卷期：v.135,no.47(November 27, 2013)
• ISSN：1520-5126

文摘

A cobalt-sulfide (Co鈥揝) 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 (畏) 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鈥揝 film, along with its low overpotential, high activity, and long-term aqueous stability, offer promising features for potential use in solar energy applications.