泡沫镍上电沉积花瓣状NiFeOxHy/rGO用于析氧反应

开发碱性体系的高效低成本析氧电催化剂是由可再生能源转化制氢的关键。本研究通过在泡沫Ni基底上原位电化学沉积的方法制备了花瓣状NiFeO_xH_y和NiFeO_xH_y/rGO复合催化剂用于析氧反应。花瓣状的结构不仅明显提高了催化剂的比表面积，而且暴露了更多的层状边缘和缺陷，进而增加了催化剂的活性中心。还原氧化石墨烯的加入进一步提升了催化剂的电导和析氧电催化性能，通过优化NiFeO_xH_y/rGO在1 mol/L KOH溶液中的析氧性能为：过电位200 mV（10 mA/cm²）、Tafel斜率29.11 mV/decade，并且保持了较好的稳定性。

In-situ electrodeposited flower-like NiFeOxHy/rGO on nickel foam for oxygen evolution reaction

Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) in basic media is critical to hydrogen production from renewable energy. Herein, in-situ electrodeposited flower-like NiFeO_xH_y and NiFeO_xH_y/rGO composite electrocatalysts on Ni foam for OER are reported. The active sites of the flower-like electrocatalysts are increased significantly due to the enhanced NiFeO_xH_y surface areas and numerous exposed layered edges and edge defects. Reduced graphene oxide (rGO) has been introduced to fabricate NiFeO_xH_y/rGO composite film, further improving the conductivity and OER performance of the flower-like NiFeO_xH_y. The optimized NiFeO_xH_y/rGO exhibits superior OER performance with a Tafel slope of 29.11 mV/decade, an overpotential of 200 mV at 10 mA/cm² in 1 mol/L KOH and favorable long-term stability.