Oxygen Reduction and Evolution on Ni-modified Co3 O4 (1 1 1) Cathodes for Zn-Air Batteries: A Combined Surface Science and Electrochemical Model Study.,ChemSusChem

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Oxygen Reduction and Evolution on Ni-modified Co3 O4 (1 1 1) Cathodes for Zn-Air Batteries: A Combined Surface Science and Electrochemical Model Study.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-03-26 , DOI: 10.1002/cssc.202000503
Florian Buchner ₁ , Markus Eckardt _{1,

2,

3} , Timo Böhler ₁ , Jihyun Kim ₁ , Jasmin Gerlach ₁ , Johannes Schnaidt _{2,

3} , R Jürgen Behm _{1,

2}

Affiliation

The performance of structurally and chemically well‐defined Ni‐free and Ni‐modified single‐crystalline Co₃O₄(1 1 1) thin‐film electrodes in the oxygen reduction and evolution reactions (ORR and OER) was investigated in a combined surface science and electrochemistry approach. Pure and Ni‐modified Co₃O₄(1 1 1) film electrodes were prepared and characterized under ultrahigh‐vacuum conditions by scanning tunneling microscopy and X‐ray photoelectron spectroscopy. Both Ni decoration (by post‐deposition of Ni) and Ni doping (by simultaneous vapor deposition of Ni, Co, and O₂) induced distinct differences in the base cyclic voltammograms in 0.5 m KOH at potentials higher than 0.7 V compared with Co₃O₄(1 1 1) electrodes. Also, all oxide film electrodes showed a higher overpotential for the ORR but a lower one for the OER than polycrystalline Pt. Ni modification significantly improved the ORR current densities by increasing the electrical conductivity, whereas the OER onset of approximately 1.47 V_RHE (RHE: reversible hydrogen electrode) at 0.1 mA cm⁻² was almost unchanged.

中文翻译：

锌空气电池 Ni 改性 Co3 O4 (1 1 1) 阴极上的氧还原和演化：表面科学与电化学模型相结合的研究。

在组合表面中研究了结构和化学上明确的无镍和镍改性单晶 Co ₃ O ₄ (1 1 1) 薄膜电极在氧还原和析出反应（ORR 和 OER）中的性能科学和电化学方法。在超高真空条件下制备纯Co ₃ O ₄ (1 1 1)薄膜电极和Ni改性Co 3 O 4 (1 1 1)薄膜电极，并通过扫描隧道显微镜和X射线光电子能谱对其进行表征。_{与 Co 3}相比，Ni 修饰（通过 Ni 的后沉积）和 Ni 掺杂（通过同时气相沉积 Ni、Co 和 O ₂ ）在高于 0.7 V 的电位下 0.5 m KOH中的基础循环伏安图产生明显差异 O ₄ (1 1 1) 电极。此外，与多晶 Pt 相比，所有氧化物膜电极都表现出较高的 ORR 过电势，但 OER 的过电势较低。Ni改性通过增加电导率显着提高了ORR电流密度，而0.1 mA cm ^{-2下约1.47 V}_RHE（RHE：可逆氢电极）的OER起始几乎没有变化。

更新日期：2020-03-26

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