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Improving Electrocatalysts for Oxygen Evolution Using NixFe3–xO4/Ni Hybrid Nanostructures Formed by Solvothermal Synthesis
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-22 00:00:00 , DOI: 10.1021/acsenergylett.8b00888 Jinzhen Huang 1 , Jiecai Han 1 , Ran Wang 1 , Yuanyuan Zhang 2 , Xianjie Wang 2 , Xinghong Zhang 1 , Zhihua Zhang 3 , Yumin Zhang 1 , Bo Song 1, 2, 4, 5 , Song Jin 6
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-22 00:00:00 , DOI: 10.1021/acsenergylett.8b00888 Jinzhen Huang 1 , Jiecai Han 1 , Ran Wang 1 , Yuanyuan Zhang 2 , Xianjie Wang 2 , Xinghong Zhang 1 , Zhihua Zhang 3 , Yumin Zhang 1 , Bo Song 1, 2, 4, 5 , Song Jin 6
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Spinel-type oxides have been found to be active electrocatalysts for OER. However, their semiconductor character severely limits their catalytic performance. Herein, we report a facile solvothermal pathway for the synthesis of spinel-type NixFe3–xO4 oxides/Ni metal nanocomposites. The good electrical contact between the metal and semiconductor oxide interface and well-tuned compositions of NixFe3–xO4 spinel oxides are crucial to achieve better OER performance. Specifically, the NixFe3–xO4/Ni nanocomposite sample prepared from a metal precursor ratio of y = 0.15 [y = Fe/(Fe + Ni)] that results in an x value of about 0.36 exhibits catalytic activity with an overpotential of 225 mV to achieve an electrocatalytic current density of j = 10 mA cm–2 and a Tafel slope of 44 mV dec–1 in alkaline electrolyte. This study not only provides new perspectives to designing nanocomposite catalysts for OER but also opens a promising avenue for further enhancing electrocatalytic performance via interface and composition engineering.
中文翻译：
使用溶剂热合成法形成的Ni x Fe 3– x O 4 / Ni杂化纳米结构改进用于析氧的电催化剂
现已发现尖晶石型氧化物是OER的活性电催化剂。但是，它们的半导体特性严重限制了它们的催化性能。在这里，我们报告了一种容易的溶剂热途径，用于合成尖晶石型Ni x Fe 3– x O 4氧化物/ Ni金属纳米复合材料。金属和半导体氧化物界面之间的良好电接触以及Ni x Fe 3– x O 4尖晶石氧化物的良好调整组成对于实现更好的OER性能至关重要。具体而言，由y的金属前驱体比例制备的Ni x Fe 3– x O 4 / Ni纳米复合材料样品= 0.15 [ y = Fe /（Fe + Ni）]导致x值约为0.36，表现出催化活性，超电势为225 mV，从而实现j = 10 mA cm –2的电催化电流密度和Tafel斜率为在碱性电解液中为44 mV dec –1。这项研究不仅为设计用于OER的纳米复合催化剂提供了新的观点，而且为通过界面和组成工程进一步提高电催化性能开辟了有希望的途径。
更新日期：2018-06-22
中文翻译：
使用溶剂热合成法形成的Ni x Fe 3– x O 4 / Ni杂化纳米结构改进用于析氧的电催化剂
现已发现尖晶石型氧化物是OER的活性电催化剂。但是，它们的半导体特性严重限制了它们的催化性能。在这里，我们报告了一种容易的溶剂热途径，用于合成尖晶石型Ni x Fe 3– x O 4氧化物/ Ni金属纳米复合材料。金属和半导体氧化物界面之间的良好电接触以及Ni x Fe 3– x O 4尖晶石氧化物的良好调整组成对于实现更好的OER性能至关重要。具体而言，由y的金属前驱体比例制备的Ni x Fe 3– x O 4 / Ni纳米复合材料样品= 0.15 [ y = Fe /（Fe + Ni）]导致x值约为0.36，表现出催化活性，超电势为225 mV，从而实现j = 10 mA cm –2的电催化电流密度和Tafel斜率为在碱性电解液中为44 mV dec –1。这项研究不仅为设计用于OER的纳米复合催化剂提供了新的观点，而且为通过界面和组成工程进一步提高电催化性能开辟了有希望的途径。
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