Vertical-Space-Limit Synthesis of Bifunctional Fe, N-Codoped 2D Multilayer Graphene Electrocatalysts for Zn-Air Battery

作     者：Wang, Chen Li, Zhongfang Wang, Likai Lu, Xuewei Wang, Suwen Niu, Xueliang 

作者机构：Shandong Univ Technol Sch Chem & Chem Engn Zibo 255049 Peoples R China 

出 版 物：《ENERGY TECHNOLOGY》 (能源技术)

年 卷 期：2019年第7卷第6期

页      面：1900123-1900123页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：National Natural Science Foundation of China [21776167, 21805170, 21276148] State Key Laboratory of Chemical Engineering (Tianjin University) [SKL-ChE-14B01] Chemical Engineering and Technology First-class Subject of Shandong Province 

主　　题：bifunctional oxygen electrocatalysts Fe-N-doped graphene H-montmorillonite nanoreactors OER ORR Zn-air batteries 

摘      要：Developing a green, cost-efficient air-cathode catalyst with high oxygen evolution and reduction reaction (OER/ORR) performance for rechargeable Zn-air batteries (ZABs) has gained attention. Iron-containing nitrogen-doped graphene (Fe/N-G) that contains Fe-N-x coordination sites is prepared by pyrolyzing the complex of iron ion and PANI sheets intercalated with the unique layer gaps of H-montmorillonite nanoreactors. The transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis confirm that there are no crystalline materials, such as iron lattice, iron carbide, or iron nitride. The as-prepared Fe/N-G show a high electrocatalytic activity in ORR with a 4e(-) transfer process and the half-wave potential of Fe/N-G (0.877 V vs reversible hydrogen electrode-RHE), which is better than that of Pt/C in oxygen saturated 0.1 m KOH solution. In an acid electrolyte, the Fe/N-G possesses a half-wave potential similar to that of 20 wt% Pt/C. For OER, the Fe/N-G exhibits the overpotential of 400 mV versus RHE at 10 mA cm(-2). However, the Fe/N-G as the air-cathode of the homemade rechargeable ZABs exhibits a high power density (156.8 mW cm(-2)) and an excellent long discharge-charge cycling stability (787 cycles) at 20 mA cm(-2). This work provides an inspiring guideline to prepare a high-performance bifunctional air-cathode for a rechargeable ZAB.