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.
State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, P. R. China.
Angew Chem Int Ed Engl. 2023 Jun 12;62(24):e202302689. doi: 10.1002/anie.202302689. Epub 2023 May 3.
The 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 Ca Co O and N-type CaMnO as charge and discharge thermoelectrocatalysts, respectively. The Seebeck voltages generated from thermoelectric effect of Ca Co O and CaMnO synergistically compensated the charge and discharge overpotentials. The carrier migration and accumulation on the cold surface of Ca Co O and CaMnO 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.
在空气电极中，氧析出反应和还原反应的动力学缓慢以及相互干扰导致了大的充放电过电位和低的锌空气电池能量效率。在这项工作中，我们设计了一种在电池中使用 P 型 CaCoO 和 N 型 CaMnO 分别作为充放电热电催化剂的呼吸式空气电极结构。CaCoO 和 CaMnO 的热电器件协同产生的塞贝克电压补偿了充放电过电位。载流子在 CaCoO 和 CaMnO 冷表面的迁移和积累优化了金属位点的电子结构，从而增强了它们的本征催化活性。在 200°C 的温度梯度下，氧析出和还原过电位分别增强了 101 和 90 mV。呼吸式锌空气电池表现出显著的 68.1%能量效率。这项工作为利用余热来提高锌空气电池的能量效率提供了一条有效的途径。
