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首页> 外文期刊>International Journal of Electrochemical Science >Studies on the Effect of the Substrate on the Electrocatalytic Performance of Electrodeposited NiFe Hydroxides for Oxygen Evolution Reaction
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Studies on the Effect of the Substrate on the Electrocatalytic Performance of Electrodeposited NiFe Hydroxides for Oxygen Evolution Reaction

机译：基质对电沉积NiFe氢氧化物对氧析出反应的电催化性能的影响研究

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摘要

As one of the most promising candidates for the oxygen evolution reaction (OER), NiFe hydroxideshave attracted tremendous attention due to their earth abundance, cost-effectiveness, and relativelyhigh catalytic activity. In this work, to investigate the effect of the underlying substrate on theelectrocatalytic activity of NiFe hydroxides for the OER, NiFe hydroxides were prepared on varioussubstrates including Au, Cu, C, ITO, and Ti via an electrodeposition technique. The whole preparationprocess is extremely clean since it avoids the introduction of any surfactants, binders, reducers orcapping agents, ensuring the clean surface of NiFe hydroxides and thus allowing a true comparison ofthe effect of the substrate composition on the electrocatalytic performance of NiFe hydroxides. Thesurface morphology and chemical element distribution of the electrodes were studied by a scanningelectron microscope and energy dispersive X-ray analysis, and the chemical composition wascharacterized by X-ray photoelectron spectroscopy. The NiFe hydroxides electrodeposited on varioussubstrates exhibit similar thin film surface morphologies and are grown horizontally on the surface ofthe substrate, possessing some small wrinkles approximately vertically aligned to the surface. Amongthe NiFe hydroxides formed on the various substrates, the NiFe hydroxides on the Au substrate exhibitthe most remarkable enhancement in electrocatalytic activity towards the OER, and the current densityreaches 149 mA cm –2 at 0.8 V (vs. saturated calomel electrode). The catalytic current density shows noevident decay after an accelerated durability test of 10000 s. This work provides a systematic study onthe influence of the substrate composition on the electrocatalytic activity of electrodeposited NiFehydroxides and demonstrates new ways to develop high-performance catalysts.
机译：作为氧放出反应（OER）的最有希望的候选者之一，氢氧化镍铁由于其土壤丰富，成本效益和相对较高的催化活性而备受关注。在这项工作中，为了研究下面的基质对NiFe氢氧化物对OER的电催化活性的影响，通过电沉积技术在包括Au，Cu，C，ITO和Ti在内的各种基质上制备了NiFe氢氧化物。整个制备过程非常干净，因为它避免了引入任何表面活性剂，粘合剂，还原剂或封端剂，确保了NiFe氢氧化物的清洁表面，因此可以真正比较基质组合物对NiFe氢氧化物的电催化性能的影响。通过扫描电子显微镜和能量色散X射线分析研究了电极的表面形态和化学元素分布，并通过X射线光电子能谱表征了化学成分。电沉积在各种基材上的NiFe氢氧化物表现出相似的薄膜表面形态，并在基材表面上水平生长，并具有一些与表面垂直对齐的小皱纹。在各种基材上形成的NiFe氢氧化物中，Au基材上的NiFe氢氧化物对OER的电催化活性表现出最显着的增强，并且在0.8 V（vs。饱和甘汞电极）下，电流密度达到149 mA cm -2。在10000 s的加速耐久性试验后，催化电流密度显示出明显的衰减。这项工作提供了对底物组成对电沉积镍铁氢氧化物电催化活性影响的系统研究，并展示了开发高性能催化剂的新方法。

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