Exploiting Earth-abundant and highly effective electrocatalysts toward the oxygen evolution reaction (OER) is critical for boosting water splitting efficiency. Herein, we proposed a novel in situ phosphoselenization strategy to fabricate heterostructured NiSe2/Ni2P/FeSe2 (NiFePSe) nanocages with a modified electronic structure and well-defined nanointerfaces. Owing to the strong interfacial coupling and synergistic effect among the three components, the prepared NiFePSe nanocages exhibit superior OER performance with an ultralow overpotential of 242 mV at 10 mA cm−2 and a small Tafel slope of 55.8 mV dec−1 along with robust stability in 1 M KOH. Remarkably, the highly open 3D porous architecture, delicate internal voids, and numerous surface defects endow the NiFePSe nanocages with abundant active sites and enhanced electron mobility. In addition, the super-hydrophilic surface is conducive to facilitating mass transfer between the electrolyte and electrode and rapidly releasing the bubbles. This work may lead to new breakthroughs in the tuning of multi-component transition metal catalysts and the designing of highly active and durable materials for water splitting.
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机译:利用地球上充足的和非常有效的electrocatalysts氧进化为提高水反应(OER)是至关重要的分割效率。原位phosphoselenization策略来制造nanocages与修改后的电子结构和定义良好的nanointerfaces。强大的界面耦合和协同效果在三个组件,准备NiFePSe nanocages表现出优越的OER超低过电压242性能mV马10厘米−2和一个小塔费尔斜率为55.8mV 12月−1加上1 M KOH的鲁棒稳定性。值得注意的是,高度开放的三维多孔体系结构、精致的内部空洞和大量的表面缺陷赋予NiFePSenanocages丰富活跃的站点和增强电子迁移率。super-hydrophilic表面有利于促进之间的传质电解液和电极和快速释放的泡沫。突破多组分的优化的过渡金属催化剂的设计高度活跃的和耐用的材料分裂。
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