Se-Doping Activates FeOOH for Cost-Effective and Efficient Electrochemical Water Oxidation
Se-Doping Activates FeOOH for Cost-Effective and Efficient Electrochemical Water Oxidation
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Se 掺杂激活 FeOOH，实现经济高效的电化学水氧化
DOI：
10.1021/jacs.9b01214
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发表时间：
2019-05-01
影响因子：
15
通讯作者：
Wan, Li-Jun
中科院分区：
文献类型：
--
作者：
Niu, Shuai;Jiang, Wen-Jie;Wan, Li-Jun
镍或钴是催化析氧反应(OER)的高效电催化剂中常用的催化剂。尽管铁的储量要丰富得多，价格也便宜得多，但全铁或富铁催化剂活性不足。在这里，我们发现，Se掺杂可以显著地促进FeOOH上的OER，并开发了一种简便的现场电化学活化策略，通过FeSe预催化剂实现了这样一种掺杂Se的FeOOH电极。理论分析和系统实验证明，Se掺杂使FeOOH成为一种高效、低成本的OER电催化剂。通过优化电极结构，在348 mV的低过电位下，获得了500 mA cm(-2)的工业级OER电流输出。这种富铁OER电极在实际太阳能制氢系统中的应用表明，太阳能对氢气的高稳定效率为18.55%，这使得该策略有望探索出新的低成本、高活性的清洁制氢电催化剂。
Ni or Co is commonly required in efficient electrocatalysts for oxygen evolution reaction (OER). Although Fe is much more abundant and cheaper, full-Fe or Fe-rich catalysts suffer from insufficient activity. Herein, we discover that Se-doping can drastically promote OER on FeOOH and develop a facile on-site electrochemical activation strategy for achieving such a Se-doped FeOOH electrode via an FeSe precatalyst. Theoretical analysis and systematic experiments prove that Se-doping enables FeOOH as an efficient and low-cost OER electrocatalyst. By optimizing the electrode structure, an industrial-level OER current output of 500 mA cm(-2) is secured at a low overpotential of 348 mV. The application of such an Fe-rich OER electrode in a practical solar-driven water splitting system demonstrates a high and stable solar-to-hydrogen efficiency of 18.55%, making the strategy promising for exploring new cost-effective and highly active electrocatalysts for clean hydrogen production.