分级三维结构高活性自支撑NiO_(x)H_(y)电化学析氧催化电极制备研究

Fabrication of Hierarchical Three-Dimensional Self-Standing NiO_(x)H_(y)Electrode toward Efficient Oxygen Evolution Reaction

氢能技术是当前最具前景的洁净能源技术之一,而电解水制氢作为其中的关键一环,其阴阳极的两个半反应对贵金属的过分依赖极大地限制了电解水技术的商业化应用。为寻求低成本、耐用和高效的替代材料,以泡沫镍为镍源,使用苯甲醇作为有机溶剂,在水热条件下实现泡沫镍表面的有机无机界面反应,生长得到了分级三维结构NiO_(x)H_(y)。这种分级三维结构可以增加自支撑催化电极的电化学析氧反应(OER)活性。同时,由于NiO_(x)H_(y)是原位生长在泡沫镍基底上,催化剂表现出卓越的稳定性。通过一系列的电化学测试可知,得到的NiO_(x)H_(y)是一种高活性、高稳定性的碱性OER催化剂,具备在商业电解池中使用的潜力。

Hydrogen energy technology is one of the most promising clean energy technologies,and hydrogen production from water electrolysis is a key segment in the hydrogen circle.The excessive reliance on precious metals in the two half reactions greatly inhibits the commercialization of water electrolysis technology.In order to develop cost-effective,durable and efficient alternative catalysts,nickel foam was used as the nickel source,and benzyl alcohol was used as the organic solvent to realize the organic-inorganic interface reaction on the surface of nickel foam under hydrothermal conditions.The hierarchical three-dimensional structural NiO_(x)H_(y)nanosheets were therefore in-situ grown on nickel foam to form the NiO_(x)H_(y)electrode.The hierarchical three-dimensional structure can greatly increase the electrochemical oxygen evolution reaction(OER)activity.At the same time,due to the in-situ growth of NiO_(x)H_(y)nanosheets,the catalyst exhibited excellent stability toward OER.According to the electrochemical tests,the as-synthesized self-standing NiO_(x)H_(y)electrode is a kind of alkaline OER catalyst with high activity and stability with promising application potential in commercial electrolyzers.