Silver-modified porous 3D nitrogen-doped graphene aerogel: Highly efficient oxygen reduction electrocatalyst for Zn−Air battery

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2019-04-10 DOI:10.1016/j.electacta.2019.02.051

Jie Hu , Ziwei Shi , Xueqian Wang , Huici Qiao , Hao Huang

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引用次数: 14

Abstract

Developing highly efficient electrocatalyst is crucial to improve the efficiency of oxygen reduction reaction for Zn-air battery. Herein, Ag-modified porous 3D nitrogen-doped graphene aerogel is synthesized by one-step hydrothermal method for promoting the electrocatalytic performance and stability toward oxygen reduction reaction. Interestingly, in this study, N doping process, reduction of AgNO₃ and graphene oxide, and the three-dimensional self-assembly can be finished during the hydrothermal synthesis at the same time. The obtained Ag-modified 3D nitrogen-doped graphene hybrid presents an interconnected 3D porous framework and Ag nanoparticles homogeneously distribute on the inner and surface of 3D N-doped graphene networks. The unique structure results in excellent oxygen reduction reaction catalytic activity with a superior stability to commercial 20 wt% Pt/C. The high electrochemical activity and durability of the hybrid is also confirmed in Zn-air batteries that outperform Pt/C in discharge voltage plateau and long-term durability, showing a promising oxygen reduction catalyst for Zn-air batteries.

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银修饰多孔三维氮掺杂石墨烯气凝胶:锌-空气电池的高效氧还原电催化剂

开发高效电催化剂是提高锌空气电池氧还原反应效率的关键。为了提高氧还原反应的电催化性能和稳定性，采用一步水热法制备了ag修饰的多孔三维氮掺杂石墨烯气凝胶。有趣的是，在本研究中，水热合成过程中可以同时完成N掺杂、AgNO3和氧化石墨烯的还原和三维自组装。得到的Ag修饰的三维氮掺杂石墨烯杂化物呈现出相互连接的三维多孔框架，Ag纳米颗粒均匀分布在三维氮掺杂石墨烯网络的内部和表面。独特的结构使其具有优异的氧还原反应催化活性，对20 wt% Pt/C具有优异的稳定性。在锌空气电池中也证实了该混合材料的高电化学活性和耐久性，在放电电压平台和长期耐久性方面优于Pt/C，显示了一种很有前途的锌空气电池氧还原催化剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.