Apically guiding electron/mass transfer reaction induced by Ag/FeN_(x)Mott-Schottky effect within a hollow star reactor toward high performance zinc-air batteries  

作　　者：Kaixiang Shi Kaixin Wang Tong Li Junhao Li Jie Ren Xu Li Yonggang Min Zhouguang Lu Wei Tan Quanbing Liu 

机构地区：[1]Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center(Rongjiang Laboratory),Guangdong University of Technology,Jieyang 515200,Guangdong,China [2]Guangzhou Key Laboratory of Clean Transportation Energy Chemistry,Guangdong Provincial Key Laboratory of Plant Resources Biorefinery,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,Guangdong,China [3]Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province,School of Chemistry and Chemical Engineering,Hainan Normal University,Haikou 571158,Hainan,China [4]School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China [5]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第8期106-116,I0004,共12页能源化学（英文版）

基　　金：the financial support of the National Natural Science Foundation of China(52002079,22378074,22179025 and U20A20340);the Guangdong Basic and Applied Basic Research Foundation(2022A1515140085);the Research Fund Program of Guangdong Provincial Key Laboratory of Fuel Cell Technology(FC202209);the Guangzhou Hongmian Project(HMJH-20200012);the Foshan Introducing Innovative and Entrepreneurial Teams(1920001000108)。

摘　　要：The disparity in the transfer of carriers(electrons/mass)during the reaction in zinc-air batteries(ZABs)results in sluggish kinetics of the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),along with elevated overpotentials,thereby imposing additional constraints on its utilization.Therefore,the pre-design and target-development of inexpensive,high-performance,and long-term stable bifunctional catalysts are urgently needed.In this work,an apically guiding dual-functional electrocatalyst(Ag-FeN_(x)-N-C)was prepared,in which a hierarchical porous nitrogen-doped carbon with three-dimensional(3D)hollow star-shaped structure is used as a substrate and high-conductivity Ag nanoparticles are coupled with iron nitride(FeN_(x))nanoparticles.Theoretical calculations indicate that the Mott-Schottky heterojunction as an inherent electric field comes from the two-phase bound of Ag and FeN_(x),of which electron accumulation in the FeN_(x)phase region and electron depletion in the Ag phase region promote orientated-guiding charge migration.The effective modulation of local electronic structures felicitously reforms the d-band electron-group distribution,and intellectually tunes the masstransfer reaction energy barriers for both ORR/OER.Additionally,the hollow star-s haped hierarchical porous structure provides an apical region for fast mass transfer.Experimental results show that the halfwave potential for ORR is 0.914 V,and the overpotential for OER is only 327 mV at 10 mA cm^(-2).A rechargeable ZAB with Ag-FeN_(x)-N-C as the air cathode demonstrates long-term cycling performance exceeding 1500 cycles(500 h),with a power density of 180 mW cm^(-2).Moreover,when employing AgFeN_(x)-N-C as the air cathode,flexible ZABs demonstrate a notable open-circuit voltage of 1.42 V and achieve a maximum power density of 65.6 mW cm^(-2).Ag-FeN_(x)-N-C shows guiding electron/mass transfer route and apical reaction microenvironment for the electrocatalyst architecture in the exploration prospects of ZABs.

关 键 词：Hollow star structure Mott-Schottky effect Apically guiding effect Bifunctional catalysis Zinc-air batteries 

分 类 号：TM911.41[电气工程—电力电子与电力传动]