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

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外文摘要：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 elec-trocatalyst(Ag-FeNx-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(FeNx)nanoparticles.Theoretical calculations indicate that the Mott-Schottky heterojunction as an inherent electric field comes from the two-phase bound of Ag and FeNx,of which electron accumulation in the FeNx phase region and electron depletion in the Ag phase region promote orientated-guiding charge migration.The effective modulation of local electronic struc-tures felicitously reforms the d-band electron-group distribution,and intellectually tunes the mass-transfer reaction energy barriers for both ORR/OER.Additionally,the hollow star-shaped hierarchical por-ous structure provides an apical region for fast mass transfer.Experimental results show that the half-wave 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-FeNx-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 Ag-FeNx-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-FeNx-N-C shows guiding electron/mass transfer route and apical reaction microenvironment for the electrocatalyst architecture in the exploration pro-spects of ZABs.

外文关键词：

Hollow star structureMott-Schottky effectApically guiding effectBifunctional catalysisZinc-air batteries

作者：

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

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作者单位：

Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center(Rongjiang Laboratory),Guangdong University of Technology,Jieyang 515200,Guangdong,China

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

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

School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China

Department of Materials Science and Engineering Southern University of Science and Technology,Shenzhen 518055,Guangdong,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research FoundationResearch Fund Program of Guangdong Provincial Key Laboratory of Fuel Cell TechnologyGuangzhou Hongmian ProjectFoshan Introducing Innovative and Entrepreneurial Teams

项目编号：

520020792237807422179025U20A203402022A1515140085FC202209HMJH-2020-00121920001000108

出版年：

2024

DOI：

10.1016/j.jechem.2024.03.040

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.95(8)