Designing Breathing Air‐electrode and Enhancing the Oxygen Electrocatalysis by Thermoelectric Effect for Efficient Zn‐air Batteries

Author:

Zheng Xuerong12ORCID,Cao Yanhui1,Wang Haozhi2,Zhang Jinfeng1,Zhao Menghan1,Huang Zhong2,Wang Yang2,Zhang Li3,Deng Yida12,Hu Wenbin1,Han Xiaopeng1ORCID

Affiliation:

1. School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) Tianjin University Tianjin 300072 P. R. China

2. State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and Engineering Hainan University Haikou 570228 P. R. China

3. School of Materials Science and Engineering Shaanxi University of Science & Technology Xi'an 710021 China

Abstract

AbstractThe sluggish kinetics and mutual interference of oxygen evolution and reduction reactions in the air electrode resulted in large charge/discharge overpotential and low energy efficiency of Zn‐air batteries. In this work, we designed a breathing air‐electrode configuration in the battery using P‐type Ca3Co4O9 and N‐type CaMnO3 as charge and discharge thermoelectrocatalysts, respectively. The Seebeck voltages generated from thermoelectric effect of Ca3Co4O9 and CaMnO3 synergistically compensated the charge and discharge overpotentials. The carrier migration and accumulation on the cold surface of Ca3Co4O9 and CaMnO3 optimized the electronic structure of metallic sites and thus enhanced their intrinsic catalytic activity. The oxygen evolution and reduction overpotentials were enhanced by 101 and 90 mV, respectively, at temperature gradient of 200 °C. The breathing Zn‐air battery displayed a remarkable energy efficiency of 68.1 %. This work provides an efficient avenue towards utilizing waste heat for improving the energy efficiency of Zn‐air battery.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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