3D Graphene‐Carbon Nanotube Hybrid Supported Coupled Co‐MnO Nanoparticles as Highly Efficient Bifunctional Electrocatalyst for Rechargeable Zn‐Air Batteries. Issue 21 (6th October 2020)

• Record Type: Journal Article
• Authors: Zhang, Chaoqi; Kong, Fantao; Qiao, Yu; Zhao, Qingbiao; Kong, Aiguo; Shan, Yongkui
• Is Part Of: Chemistry, an Asian journal. Volume 15:Issue 21(2020)
• Page Start: 3535
• Page End: 3541
• Publication Date: 2020-10-06
• Subjects: Co/MnO coupling NPs -- 3D carbon material -- bifunctional electrocatalyst -- metal-air battery; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.202000913
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: 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. Abstract : A three‐dimensional graphene‐carbon nanotube hybrid supported coupled Co−MnO catalysts could be figuratively described as the luxuriant tree with fruit, whose structure reveals the unique advantages for oxygen conversion reaction. The outstanding electrocatalytic performance endows the material with a wide application prospect in sustainable energy conversion systems.