标题：Bifunctional Oxygen Electrocatalysis of N, S-Codoped Porous Carbon with Interspersed Hollow CoO Nanoparticles for Rechargeable Zn-Air Batteries
作者：Chen, Si; Chen, Song; Zhang, Baohua; Zhang, Jintao
作者机构：[Chen, Si; Chen, Song; Zhang, Baohua; Zhang, Jintao] Shandong Univ, Sch Chem & Chem Engn, State Educ Minist, Key Lab Colloid & Interface Chem, Jinan 2 更多
通讯作者：Zhang, JT;Zhang, Jintao
通讯作者地址：[Zhang, JT]Shandong Univ, Sch Chem & Chem Engn, State Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
来源：ACS APPLIED MATERIALS & INTERFACES
关键词：cobalt oxide; N, S co-doping; bifunctional electrocatalyst; Zn-air; battery; porous carbon
摘要：Exploring efficient bifunctional oxygen electrocatalysts is beneficial to promote the practical applications for rechargeable Zn-air batteries. Herein, a high-efficiency one-pot method is developed to synthesize porous carbon with N, S doping and embedded hollow cobalt oxide nanoparticles. The coordination of polyethyleneimine molecules with cobalt ions enables the formation of organic-inorganic precursors via the co-precipitation with lignosulfonate because of the electrostatic interaction. Under thermal treatment, the hollow cobalt oxide nanoparticles can be well dispersed among the carbon matrix codoped with N, S. The as-prepared composite catalysts exhibit efficient bifunctional activity for electrochemical reduction and evolution reactions of oxygen, thanks to the N, S codoping nature and the hollow cobalt oxide with abundant oxygen vacancies. The bifunctional catalytic activity renders the assembly of high-performance Zn-air battery in an aqueous electrolyte with a specific capacity of 745 mA h g(zn)(-1) and good cycling stability for over 100 h. More importantly, the all-solid-state Zn-air battery is assembled with a polymer-based electrolyte, also exhibiting good cycling stability and flexibility under various bending status.