Trimetallic Spinel‐Type Cobalt Nickel‐Doped Manganese Oxides as Bifunctional Electrocatalysts for Zn‐Air Batteries,Batteries & Supercaps

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Trimetallic Spinel‐Type Cobalt Nickel‐Doped Manganese Oxides as Bifunctional Electrocatalysts for Zn‐Air Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-27 , DOI: 10.1002/batt.202000006
Soracha Kosasang _{1,

2} , Harnchana Gatemala _{1,

2} , Nattapol Ma _{1,

2} , Praeploy Chomkhuntod _{1,

2} , Montree Sawangphruk _{1,

2}

Affiliation

This work demonstrates the effect of trimetallic and bimetallic electrocatalysts of spinel‐type metal oxides towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The trimetallic spinel‐type Co_0.5Ni_0.5Mn₂O₄ shows higher bifunctional electrocatalytic activity towards ORR and OER than bimetallic oxides such as CoMn₂O₄ and NiMn₂O₄. The in situ X‐ray absorption spectroscopy was applied to observe the change in the oxidation number of Mn, Ni, and Co during the reactions to demonstrate the active metals on the ORR and OER. The Co plays a more important role in the ORR process than the Ni and Mn, while the three metals exhibit an equivalent contribution on the OER activity as observed from the oxidation state shift. Additionally, the practicality of Zn‐air batteries using the trimetallic spinel catalyst is demonstrated to power light‐emitting diode and spinning motor with a nominal voltage of 3 V. Bifunctional trimetallic electrocatalysts in this work may be useful for other metal‐air batteries.

中文翻译：

三金属尖晶石型钴镍掺杂的锰氧化物作为锌空气电池的双功能电催化剂

这项工作证明了尖晶石型金属氧化物的三金属和双金属电催化剂对氧还原反应（ORR）和氧释放反应（OER）的影响。与CoMn ₂ O ₄和NiMn ₂ O ₄等双金属氧化物相比，三金属尖晶石型Co _0.5 Ni _0.5 Mn ₂ O ₄对ORR和OER具有更高的双功能电催化活性。在原位用X射线吸收光谱法观察反应过程中Mn，Ni和Co的氧化数的变化，以证明ORR和OER上的活性金属。Co在ORR过程中起着比Ni和Mn更重要的作用，而从氧化态转变观察到，这三种金属在OER活性方面具有同等作用。此外，使用三金属尖晶石催化剂的锌空气电池的实用性也得到了证明，可以为发光二极管和旋转电机提供3 V的标称电压。这项功能中的双功能三金属电化学催化剂可能对其他金属空气电池有用。

更新日期：2020-02-27

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