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In situ templating synthesis of mesoporous Ni–Fe electrocatalyst for oxygen evolution reaction

机译：原位模板合成介孔Ni-Fe电催化剂的氧气进化反应

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Low-cost and efficient electrocatalysts with high dispersion of active sites and high conductivity are of high importance for oxygen evolution reaction (OER). Herein, we use amorphous mesoporous fumed silica (MFS) as a skeleton material to disperse Ni ~(2+) and Fe ~(3+) through a simple impregnation strategy. The MFS is in situ etched away during the OER process in 1 M KOH to prepare a stable mesoporous Ni–Fe electrocatalyst. The high specific surface area and abundant surface silanol groups in the mesoporous fumed silica afford rich anchor sites for fixing metal atoms via strong chemical metal–oxygen interactions. Raman and XPS investigations reveal that Ni ~(2+) formed covalent bonds with surface Si–OH groups, and Fe ~(3+) inserted into the framework of fumed silica forming Fe–O–Si bonds. The mesoporous Ni–Fe catalysts offer high charge transfer abilities in the OER process. When loaded on nickel foam, the optimal 2Ni1Fe-MFS catalyst exhibits an overpotential of 270 mV at 10 mA cm ~(?2) and a Tafel slope of 41 mV dec ~(?1) . Notably, 2Ni1Fe-MFS shows a turnover frequency value of 0.155 s ~(?1) at an overpotential of 300 mV, which is 80 and 190 times higher than that of the state-of-the-art IrO _(2) and RuO _(2) catalysts. Furthermore, 2Ni1Fe-MFS exhibits 100% faradaic efficiency, large electrochemically active surface area, and good long-term durability, confirming its outstanding OER performance. Such high OER efficiency can be ascribed to the synergistic effect of high surface area, dense metal active sites and interfacial conductive path. This work provides a promising strategy to develop simple, cost-effective, and highly efficient porous Ni–Fe based catalysts for OER.
机译：具有高分散的活性位点和高导电性的低成本和高效的电催化剂对于氧气进化反应（OER）具有很高的重要性。在此，我们通过简单的浸渍策略使用无定形的介孔气味二氧化硅（MFS）作为骨架材料分散Ni〜（2+）和Fe〜（3+）。在1M KOH中，MFS在OER过程中原位蚀刻，以制备稳定的介孔Ni-Fe电催化剂。中孔气相二氧化硅中的高比表面积和丰富的表面硅烷醇基团提供富锚位点，用于通过强化学金属 - 氧相互作用固定金属原子。拉曼和XPS研究表明，Ni〜（2+）形成了与表面Si-OH基团的共价键，切入Fumed二氧化硅框架中的Fe〜（3+）形成Fe-O-Si键。中孔Ni-Fe催化剂在OER过程中提供高电荷转移能力。在镍泡沫上装载时，最佳的2Ni1Fe-MFS催化剂在10mA cm〜（α2）下表现出270mV的过电位，41mV Dec〜（α1）的Tafel斜率。值得注意的是，2ni1Fe-MFS在300 mV的过电位下显示出0.155秒〜（？1）的换档频率值，比最先进的IRO _（2）和Ruo高80和190倍_（2）催化剂。此外，2NI1FE-MFS展示了100％的佛教效率，大电化学活性表面积，以及良好的长期耐久性，确认其出色的OER性能。这种高oer效率可以归因于高表面积，致密金属活性位点和界面导电路径的协同作用。这项工作提供了有希望的策略，可以为oer开发简单，经济效益和高效的多孔镍氢镍催化剂。

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