3D Graphene-Carbon Nanotube Hybrid Supported the Coupled Co-MnO Nanoparticles as Highly Efficient Bifunctional Electrocatalyst for Rechargeable Zn-Air Battery.,Chemistry - An Asian Journal

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3D Graphene-Carbon Nanotube Hybrid Supported the Coupled Co-MnO Nanoparticles as Highly Efficient Bifunctional Electrocatalyst for Rechargeable Zn-Air Battery.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-09-15 , DOI: 10.1002/asia.202000913
Chaoqi Zhang ₁ , Fantao Kong ₁ , Yu Qiao ₁ , Qingbiao Zhao ₂ , Aiguo Kong ₁ , Yongkui Shan ₁

Affiliation

The development of high‐efficiency and low‐cost catalysts is one of the core and important issues to improve the efficiency of electrochemical reactions on electrodes, and it is also the goal we ultimately pursue in the commercialization of large‐scale clean energy technologies, such as metal‐air batteries. Herein, a nitrogen‐doped graphene oxide (GO)‐carbon nanotube (CNT) hybrid network supported coupled Co/MnO nanoparticles (Co/MnO@N−C) catalyst was prepared with a hydrothermal‐pyrolysis method. The unique three‐dimensional network structure of substrate allowed for the uniform dispersion of Co−MnO nanoparticles in the carbon skeleton. These characters enable the Co/MnO@N−C to possess the excellent bifunctional electrocatalysts. In alkaline electrolyte, the Co/MnO@N−C presents the outstanding oxygen evolution reaction (OER) performance comparable to the commercial RuO₂ catalyst and the exceedingly good oxygen reduction reaction (ORR) activity with positive half‐wave potential of 0.90 V vs. RHE outperforming commercial Pt/C (0.84 V vs. RHE) and the recently reported analogous electrocatalysts. When it is applied to homemade Zn‐air batteries, such a non‐noble metal electrocatalyst can deliver a better power density, specific capacity and cycling stability than mixed Pt/C and RuO₂ catalyst, and exhibits a wide application prospect and great practical value.

中文翻译：

3D石墨烯-碳纳米管杂化体支持偶联的Co-MnO纳米颗粒作为可充电锌空气电池的高效双功能电催化剂。

高效，低成本催化剂的开发是提高电极上电化学反应效率的核心和重要问题之一，也是我们最终在大规模清洁能源技术商业化中追求的目标。作为金属空气电池。在此，采用水热解法制备了掺杂Co / MnO纳米颗粒（Co / MnO @ NC）的氮掺杂氧化石墨烯（GO）-碳纳米管（CNT）混合网络。基材独特的三维网络结构使Co-MnO纳米颗粒均匀分散在碳骨架中。这些特性使Co / MnO @ NC具有出色的双功能电催化剂。在碱性电解液中₂催化剂和出色的氧还原反应（ORR）活性，相对于RHE的正半波电势为0.90 V，优于商用Pt / C（相对于RHE的0.84 V）和最近报道的类似电催化剂。当用于自制锌空气电池时，这种非贵金属电催化剂比混合的Pt / C和RuO ₂催化剂可提供更好的功率密度，比容量和循环稳定性，并具有广阔的应用前景和巨大的实用价值。。

更新日期：2020-11-04

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