新型多孔导电陶瓷负载银阴极在锌空气电池中的应用

doi:10.15541/jim20170462

无机材料学报 ›› 2018, Vol. 33 ›› Issue (8): 854-860.DOI: 10.15541/jim20170462

所属专题：离子电池材料

新型多孔导电陶瓷负载银阴极在锌空气电池中的应用

翁晓琳¹, 刘佩佩¹, 张亚鹏¹, 刘江¹, 刘美林^{1, 2}

1. 华南理工大学环境与能源学院, 新能源研究所, 广州市能源材料表面化学重点实验室, 广州510006;
2. 美国佐治亚理工学院材料科学与工程系, 亚特兰大GA 30332-0245, 美国

收稿日期:2017-09-28 修回日期:2017-11-18 出版日期:2018-08-28 网络出版日期:2018-07-17
作者简介:翁晓琳(1993-), 女, 硕士研究生. E-mail: wxl_rosaline@163.com
基金资助:
国家自然科学基金(21276097);广东省公益研究及能力建设专项基金(2014A010106008);广东省珠江人才计划引进创新创业团队项目(2014ZT05N200);国家自然科学基金委-广东省联合基金(U1601207);Special Funds of Guangdong Province Public Research and Ability Construction (2014A010106008);Guangdong Innovative, Entrepreneurial Research Team Program (2014ZT05N200);Joint Funds of National Science Foundation of China and Guangdong Province (U1601207)

A Novel Porous Electronic Conducting Ceramics Loaded with Silver Nano Particles as Cathode for Zinc-Air Batteries

WENG Xiao-Lin¹, LIU Pei-Pei¹, ZHANG Ya-Peng¹, LIU Jiang¹, LIU Mei-Lin^{1, 2}

1. Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;
2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta GA 30332-0245, USA

Received:2017-09-28 Revised:2017-11-18 Published:2018-08-28 Online:2018-07-17
About author:WENG Xiao-Lin. E-mail: wxl_rosaline@163.com
Supported by:
National Natural Science Foundation of China(21276097)

摘要/Abstract

摘要：

锌空气电池具有能量密度高、成本低及环保等优势, 其空气电极的优劣对电池的输出性能起到决定性的作用。本研究采用一种新型的多孔钙钛矿氧化物La_0.7Sr_0.3CoO_3-_δ(LSC)作为陶瓷基底, 负载银纳米颗粒作为催化剂, 研究其作为锌空电池空气电极的性能。β通过调整制备过程中造孔剂(淀粉)的含量, 优选出性能最佳的Ag-LSC空气电极(阴极), 与锌阳极组装成锌空气电池, 进行电化学性能测试。β结果表明, 当LSC基底的孔隙率为~32%且银含量30 mg/cm²时, 制备的多孔陶瓷负载银阴极组装的锌空气电池功率密度最高(141 mW/cm²)。β在Ag-LSC空气电极表面涂一层聚四氟乙烯(PTFE)疏水材料后, 锌空气电池的使用寿命得到显著延长。

关键词: 锌空气电池, 空气电极, 银纳米颗粒, 多孔钴酸锶镧基底

Abstract:

Zinc-air battery has great advantages such as high energy density, low cost and environmentally friendliness. Air electrode plays an important role in electrochemical performance of a zinc-air battery. In this paper, we report our study of a novel air electrode on which a porous perovskite ceramic La_0.7Sr_0.3CoO_3-_δ(LSC) with Ag nanoparticles directly grown. The porous LSC is used as substrate while Ag as catalyst. The porous structure of substrate attributes to the amount and dispersion of Ag nanoparticles which affect the electrochemical performance of air electrode. Therefore, the property of the Ag-LSC electrode is optimized by adjusting the mass content of pore-former (starch). Experimental results show that the Ag-LSC electrode, with a porosity of ~32% and a Ag load of ~30 mg/cm², exhibits the best performance in all tested samples, and a zinc-air battery assembled with such air electrode gives the maximum power density of 141 mW/cm. What’s more, in order to ensure the gas diffusion channels, the hydrophilicity and hydrophobicity of the cathode is modified with PTFE to prevent flooding. After all that, the life-time of the zinc-air battery, with optimization by coating a PTFE layer as hydrophobic agent on the surface of the selected Ag-LSC electrode, prolongs significantly.

Key words: zinc-air battery, air electrode, silver nanoparticle, porous La_0.7Sr_0.3CoO_3-δsubstrate;

中图分类号:

O647

翁晓琳, 刘佩佩, 张亚鹏, 刘江, 刘美林. 新型多孔导电陶瓷负载银阴极在锌空气电池中的应用[J]. 无机材料学报, 2018, 33(8): 854-860.

WENG Xiao-Lin, LIU Pei-Pei, ZHANG Ya-Peng, LIU Jiang, LIU Mei-Lin. A Novel Porous Electronic Conducting Ceramics Loaded with Silver Nano Particles as Cathode for Zinc-Air Batteries[J]. Journal of Inorganic Materials, 2018, 33(8): 854-860.

图/表 11

图1 锌空气电池的工作原理示意图(a)及实物装置图(b)

Fig. 1 Schematic diagram of mechanism (a) and device (b) of the zinc-air battery

图2 不同孔隙率的LSC钙钛矿基底的截面SEM照片

Fig. 2 Cross-sectional SEM images of the LSC substrate with different porosity

图3 LSC负载Ag前(a)后(b)的SEM照片

Fig. 3 SEM images of LSC (a) and Ag-LSC (b) (porosity 32%, loaded Ag 10 mg/cm2)

图4 Ag-LSC阴极的XRD图谱

Fig. 4 XRD patterns of Ag-LSC cathode (porosity 32%, loaded Ag 10 mg/cm2)

图5 不同孔隙率的阴极(银担载量均为10 mg/cm2)组装的锌空气电池输出性能图谱(a)及交流阻抗图(b)

Fig. 5 Output performances (a) and impedance spectra (b) of the zinc-air battery with cathode (loaded Ag 10 mg/cm2) of different porosity

图6 不同含银量的阴极(LSC基底孔隙率为32%)组装的锌空气电池输出性能

Fig. 6 Output performances of the zinc-air batteries with cathodes of different Ag contents (porosity 32%)

图7 不同电流密度下锌空气电池放电性能曲线图

Fig. 7 Discharge curve of the zinc-air battery discharged at different current densities (porosity 32%, loaded Ag 30 mg/cm2)

图8 添加PTFE阴极的SEM照片

Fig. 8 SEM image of the cathode with PTFE

图9 用添加与不添加PTFE的阴极组装的锌空气电池恒流放电曲线图

Fig. 9 Constant current discharge curves of the zinc-air battery composed of cathode with or without PTFE

图10 锌空气电池在电池放电后更换阳极锌粉的恒流放电曲线图

Fig. 10 Constant current discharge curves of the zinc-air battery of changing zinc anode after discharging

图11 锌空气电池阴极放电前后的XPS能谱图

Fig. 11 XPS spectra of the cathode of zinc-air battery before and after discharging(a) Sr3d; (b) La3d; (c) Co2p

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新型多孔导电陶瓷负载银阴极在锌空气电池中的应用

A Novel Porous Electronic Conducting Ceramics Loaded with Silver Nano Particles as Cathode for Zinc-Air Batteries

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