Mesoporous Mn–Fe oxyhydroxides for oxygen evolution,Inorganic Chemistry Frontiers

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Mesoporous Mn–Fe oxyhydroxides for oxygen evolution
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-05-27 , DOI: 10.1039/d2qi00722c
Jingyi Han ₁ , Mingzhu Zhang ₂ , Xue Bai ₁ , Zhiyao Duan ₂ , Tianmi Tang ₁ , Jingqi Guan ₁

Affiliation

The development of high-performance and Earth-abundant catalysts is imperative for the oxygen evolution reaction (OER), and mesoporous oxyhydroxides show huge potential as advanced catalysts toward the OER due to a large specific surface area and porous structure. Here, we adopt a facile template method to synthesize bimetallic Mn–Fe oxyhydroxides. meso-Mn₁Fe₁O_x shows a large BET specific surface area of 212.4 m² g⁻¹ and an average pore diameter of 13.1 nm, which favor the exposure of many active sites for the reaction. meso-Mn₁Fe₁O_x exhibits excellent OER performance with a low overpotential of 275 mV at 10 mA cm⁻², a small Tafel slope of 52 mV dec⁻¹, and good long-term stability, and is superior to most Mn-based electrocatalysts. Kinetic studies indicate that Fe and Mn sites should synergistically catalyze the OER. Theoretical calculations reveal that the surface doping of Fe onto MnOOH can moderately destabilize the surface bridge O atoms and promote the generation of surface oxygen vacancies that can act as highly active sites for the OER.

中文翻译：

用于析氧的介孔 Mn-Fe 羟基氧化物

开发高性能和储量丰富的催化剂对于析氧反应 (OER) 势在必行，而介孔羟基氧化物由于具有较大的比表面积和多孔结构，显示出作为 OER 先进催化剂的巨大潜力。在这里，我们采用一种简便的模板方法来合成双金属 Mn-Fe 羟基氧化物。meso-Mn ₁ Fe ₁ O _x^{显示出212.4 m 2} g ^-1的大BET比表面积和13.1 nm的平均孔径，这有利于反应的许多活性位点的暴露。meso-Mn ₁ Fe ₁ O _x表现出优异的 OER 性能，在 10 mA cm ^{-2时具有 275 mV 的低过电位}、52 mV dec ^-1的小塔菲尔斜率和良好的长期稳定性，优于大多数锰基电催化剂。动力学研究表明，Fe 和 Mn 位点应该协同催化 OER。理论计算表明，Fe在MnOOH上的表面掺杂可以适度地破坏表面桥氧原子的稳定性，并促进表面氧空位的产生，这些空位可以作为OER的高活性位点。

更新日期：2022-05-27

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