化学
过电位
塔菲尔方程
尖晶石
催化作用
价(化学)
氧化物
纳米笼
析氧
电化学
无机化学
物理化学
过渡金属
电极
材料科学
冶金
有机化学
生物化学
作者
Yan Liu,Yiran Ying,Linfeng Fei,Yi Liu,Qingzhao Hu,Guoge Zhang,Sin-Yi Pang,Wei Lü,Chee Leung Mak,Xin Luo,Limin Zhou,Wei Mao,Haitao Huang
摘要
A major challenge that prohibits the practical application of single/double-transition metal (3d-M) oxides as oxygen evolution reaction (OER) catalysts is the high overpotentials during the electrochemical process. Herein, our theoretical calculation shows that Fe will be more energetically favorable in the tetrahedral site than Ni and Co, which can further regulate their electronic structure of binary NiCo spinel oxides for optimal adsorption energies of OER intermediates and improved electronic conductivity and hence boost their OER performance. X-ray absorption spectroscopy study on the as-synthesized NiCoFe oxide catalysts indicates that Fe preferentially dopes into tetrahedral sites of the lattice, which induces high proportions of Ni3+ and Co2+ on the octahedral sites (the active sites in OER). Consequently, this material exhibits a significantly enhanced OER performance with an ultralow overpotential of 201 mV cm-2 at 10 mA cm-2 and a small Tafel slope of 39 mV dec-1, which are much superior to state-of-the-art Ni-Co based catalysts.
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