Hierarchical Hollow Spheres Assembled with Ultrathin CoMn Double Hydroxide Nanosheets as Trifunctional Electrocatalyst for Overall Water Splitting and Zn Air Battery,ACS Sustainable Chemistry & Engineering

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Hierarchical Hollow Spheres Assembled with Ultrathin CoMn Double Hydroxide Nanosheets as Trifunctional Electrocatalyst for Overall Water Splitting and Zn Air Battery
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-09-29 00:00:00 , DOI: 10.1021/acssuschemeng.8b03232
Kaiyue Li _{1,

2} , Dong Guo ₁ , Jianyu Kang ₁ , Bo Wei ₃ , Xitian Zhang ₂ , Yujin Chen ₁

Affiliation

Larger-scale usage of the clean energies requires advanced energy storage and conversion techniques. Overall water splitting and zinc air systems are promising energy conversion and storage means, but need high-performance, low-cost, and highly stable bifunctional electrocatalysts to hydrogen evolution/oxygen evolution reactions (HER/OER) and OER/oxygen reduction reactions (ORR), respectively. Herein we develop a facile method to fabricate CoMn double hydroxide (DH) hollow spheres as high-performance trifunctional electrocatalysts for overall water splitting and zinc-air battery. The outmost surfaces of the CoMn DH hollow spheres are composed of ultrathin nanosheets with a thickness of approximately 2.5 nm. Owing to the hollow and ultrathin features, CoMn DH hollow spheres exhibit excellent activities and robust stabilities toward HER, OER, and ORR. The overall water electrolyzer assembled with the CoMn DH hollow spheres can drive a current density of 10 mA cm^–2 at an overpotential of merely 420 mV in 1.0 M KOH, among the best reported metal oxides and hydroxides. Remarkably, each all-solid-state Zn air battery with the optimized CoMn DH hollow spheres air-cathode exhibited good cycling stability. Furthermore, two all-solid-state Zn air batteries in series can power 55 red LED and the two-electrode electrolyzer catalyzed by the optimized CoMn DH hollow spheres with excellent operation stabilities.

中文翻译：

带有超薄CoMn双氢氧化物纳米片的分层空心球体作为三功能电催化剂，用于整体水分解和Zn空气电池

大规模使用清洁能源需要先进的能量存储和转换技术。总体上，水分解和锌空气系统是有希望的能量转换和存储方式，但需要高性能，低成本和高度稳定的双功能电催化剂来进行氢气释放/氧气释放反应（HER / OER）和OER /氧气还原反应（ORR）），分别。本文中，我们开发了一种简便的方法来制造CoMn双氢氧化物（DH）空心球，作为用于整体水分解和锌空气电池的高性能三功能电催化剂。CoMn DH空心球的最外表面由厚度约为2.5 nm的超薄纳米片组成。由于具有中空和超薄特性，CoMn DH中空球表现出出色的活性和对HER，OER，和ORR。装有CoMn DH空心球的整体水电解槽可驱动10 mA cm的电流密度在1.0 M KOH中仅以420 mV的过电势产生^–2，是报道得最好的金属氧化物和氢氧化物。值得注意的是，每个具有优化的CoMn DH中空球型空气阴极的全固态Zn空气电池均表现出良好的循环稳定性。此外，两个串联的全固态Zn空气电池可以为55个红色LED和由优化的CoMn DH空心球催化的双电极电解槽供电，具有出色的操作稳定性。

更新日期：2018-09-29

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