Electrodeposited Cobalt-Sulfide Catalyst for Electrochemical and Photoelectrochemical Hydrogen Generation from Water
Electrodeposited Cobalt-Sulfide Catalyst for Electrochemical and Photoelectrochemical Hydrogen Generation from Water
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DOI：
10.1021/ja4094764
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发表时间：
2013-11-27
影响因子：
15
通讯作者：
Chang, Christopher J.
中科院分区：
文献类型：
--
作者：
Sun, Yujie;Liu, Chong;Chang, Christopher J.
通过电化学沉积在导电衬底上制备的硫化钴（Co-S）薄膜被证明是中性pH水电化学和光电化学制氢的有效和稳健的催化剂。电化学实验表明，该膜的催化起始过电位（eta）为43 mV， Tafel斜率为93 mV/dec，在pH为7的磷酸盐缓冲液中具有接近100%的法拉第效率。催化电流密度可以接近50 mA/cm(2)，活性保持至少40小时。催化剂还可以电化学涂覆在硅上，在模拟太阳光照下形成水相容的产氢光电化学系统。这种Co-S薄膜制备简单，具有过电位低、活性高、长期水稳定性好等特点，在太阳能应用中具有潜在的应用前景。
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.