Reviving zinc-air batteries with high-density metal particles on carbon

• 作者: Ya-Ping Deng Zhengyu Bai Zhongwei Chen
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（18）
• 页码范围: 1511-1513
• 页数: 3页
• 语种: 英文

摘要

As a century-old technique, rechargeable zinc-air batteries have been rejuvenated in the past decade [1,2].Their aqueous electrolytes enable high ionic conductivity, safety operation and fast reaction kinetics for high-rate outputs.However, the popularization of Zn-air batteries is still struggling due to their insufficient performance.Therefore, great research efforts (such as electrolyte additives or surficial modification etc.) have been paid to address the issues regarding Zn anode, in terms of side reactions and dendrite formation [2].Another major challenge lies in development of bifunctional oxygen electrocatalysts.Recently, transition metal nanoparticles encapsulated in nitrogen-doped carbon shells (M@NCs) are considered as one of promising options [3-10].The challenge lies in dispersing high-density and well-defined metal particles on NCs, due to the easy aggregation at either high calcination temperature or degradation in rigorous cycling conditions.To achieve the desirable and steadily output performance, the high-loading active sites is required.The simple increase of catalyst loading usually fails and hinders mass/charge transfer [11].Breakthroughs in exploring new strategies are desperately needed.