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双金属羟基氧化物——一种应用于工业相关条件下的高性能水氧化电催化剂
Jiaxin Yuan, Xiaodi Cheng, Chaojun Lei, Bin Yang, Zhongjian Li, Kun Luo, K.H. Koko Lam, Lecheng Lei, Yang Hou, Kostya Ken Ostrikov
工程（英文） ›› 2021, Vol. 7 ›› Issue (9) : 1306-1312.
PDF(2223 KB)
PDF(2223 KB)
双金属羟基氧化物——一种应用于工业相关条件下的高性能水氧化电催化剂
Bimetallic Oxyhydroxide as a High-Performance Water Oxidation Electrocatalyst under Industry-Relevant Conditions
开发高电流密度条件下的高性能析氧反应（OER）电催化剂，对于碱性电解水未来清洁能源的商业应用非常重要。鉴于此，我们通过将泡沫镍（NF）浸入Fe(NO3)3溶液，在泡沫镍基底上原位制备了三维（3D）双金属羟基氧化物杂化物（NiFeOOH/NF）。在这种独特的3D结构中，NiFeOOH/NF 杂化物由均匀生长在NF表面的晶态Ni(OH)2和无定形FeOOH物种组成。作为双金属羟基氧化物电催化剂，NiFeOOH/NF杂化物表现出优异的电催化OER活性，其性能不仅超过被报道的其他Ni-Fe 基电催化剂，而且超过商业Ir/C 催化剂。拉曼光谱结果表明，NiFeOOH/NF 杂化物在电催化OER过程中产生的FeOOH和NiOOH物种，被认为是实际的催化活性相。得益于Fe 和Ni 催化位点的协同作用，在严苛的80 ℃、10.0 mol·L﹣1 KOH电解液的工业测试条件下，NiFeOOH/NF杂化物表现出了优异的电催化OER性能，仅需1.47 V和1.51 V的应用电势就能分别达到100 mA·cm﹣2和500 mA·cm﹣2的高催化电流密度。
Developing high-performing oxygen evolution reaction (OER) electrocatalysts under high-current operation conditions is critical for future commercial applications of alkaline water electrolysis for clean energy generation. Herein, we prepared a three-dimensional (3D) bimetallic oxyhydroxide hybrid grown on a Ni foam (NiFeOOH/NF) prepared by immersing Ni foam (NF) into Fe(NO3)3 solution. In this unique 3D structure, the NiFeOOH/NF hybrid was composed of crystalline Ni(OH)2 and amorphous FeOOH evenly grown on the NF surface. As a bimetallic oxyhydroxide electrocatalyst, the NiFeOOH/NF hybrid exhibited excellent catalytic activity, surpassing not only the other reported Ni–Fe based electrocatalysts, but also the commercial Ir/C catalyst. In situ electrochemical Raman spectroscopy demonstrated the active FeOOH and NiOOH phases involved in the OER process. Profiting from the synergy of Fe and Ni catalytic sites, the NiFeOOH/NF hybrid delivered an outstanding OER performance under challenging industrial conditions in a 10.0 mol∙L-1 KOH electrolyte at 80 ºC, requiring potentials as small as 1.47 and 1.51 V to achieve the super-high catalytic current densities of 100 and 500 mA∙cm-2, respectively.
双金属羟基氧化物 / 析氧反应 / 协同效应 / 高电流密度 /
Bimetallic oxyhydroxide / 3D hybrid / electrocatalysis / oxygen evolution reaction / high current density
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