Three-dimensional interconnected graphene network-based high-performance air electrode for rechargeable zinc‒air batteries  

作　　者：Jia-Xing An Yu Meng Hong-Bo Zhang Yuanzhi Zhu Xiaohua Yu Ju Rong Peng-Xiang Hou Chang Liu Hui-Ming Cheng Jin-Cheng Li 

机构地区：[1]Faculty of Chemical Engineering,Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming University of Science and Technology,Kunming,China [2]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,China [3]Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,China

出　　处：《SusMat》2024年第3期192-203,共12页可持续发展材料（英文）

基　　金：supported by the National Natural Science Foundation of China(52102046);the Yunnan Fundamental Research Projects(202301AW070016).

摘　　要：Although zinc-air batteries(ZABs)are regarded as one of the most prospective energy storage devices,their practical application has been restricted by poor air electrode performance.Herein,we developed a free-standing air electrode that is fabricated on the basis of a multifunctional three-dimensional interconnected graphene network.Specifically,a three-dimensional interconnected graphene network with fast mass and electron transport ability,prepared by catalyzing growth of graphene foam on nickel foam and then filling reduced graphene oxide into the pores of graphene foam,is used to anchor iron phthalocyanine molecules with atomic Fe-N_(4)sites for boosting the oxygen reduction during discharging and nanosized FeNi hydroxides for accelerating the oxygen evolution during charging.As a result,the obtained air electrode exhibited an ultra-small electrocatalytic overpotential of 0.603 V for oxygen reactions,a high peak power density of 220.2mWcm^(-2),and a small and stable charge-discharge voltage gap of 0.70 V at 10mA cm^(-2)after 1136 cycles.Furthermore,in situ Raman spectroscopy together with theoretical calculations confirmed that phase transformation of FeNi hydroxides takes place fromα-Ni(OH)_(x)toβ-Ni(OH)_(x)toγ-Ni^((3+δ)+)OOH for the oxygen evolution reaction and Ni is the active center while Fe enhances the activity of Ni active sites.

关 键 词：in situ Raman interconnected graphene network iron phthalocyanine NiFe hydroxide zinc‒air battery 

分 类 号：O61[理学—无机化学]