Sulfur-modified Co3O4 as a bifunctional oxygen catalyst for zinc-air batteries

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2024-12-23 DOI:10.1007/s10853-024-10484-z

Shuwen Ma, Binji Zhu, Ruihui Gan, Yue Wang, Bangguo Zhou, Jingli Shi, Yan Song, Xiaodong Shao, Chang Ma

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Abstract

The development of highly active non-precious metal bifunctional oxygen catalysts is of great significance in improving the efficiency of zinc-air batteries (ZABs). In this work, Co₃O₄ is modified by a simple sulfur-doping strategy, which achieves a sulfur-doped Co₃O₄ (S-Co₃O₄) with significantly-enhanced oxygen catalytic activity. The doping of sulfur promotes the exposure of cobalt active sites and brings abundant oxygen vacancies, which provide additional active sites and enhance the conductivity of Co₃O₄. Consequently, S-Co₃O₄ exhibits a low overpotential of 318 mV in the oxygen evolution reaction (OER) and an improved half-wave potential (0.788 V) for oxygen reduction reaction (ORR). In addition, the sulfur doping increases the ORR kinetic current density of pristine Co₃O₄ by a factor of 49. The assembled ZABs based on S-Co₃O₄ cathodes show a higher peak power density (98.90 mW cm⁻²) than the commercial Pt/C + RuO₂-based ZABs. This work reveals that the intrinsic oxygen catalytic activity of Co₃O₄ can be significantly strengthened by sulfur doping, which can modify its structural characteristics and introduce structural defects.

Graphical abstract

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硫改性Co3O4作为锌-空气电池双功能氧催化剂

开发高活性非贵金属双功能氧催化剂对提高锌空气电池的效率具有重要意义。在这项工作中，通过简单的硫掺杂策略对Co3O4进行修饰，得到了具有显著增强氧催化活性的硫掺杂Co3O4 （S-Co3O4）。硫的掺杂促进了钴活性位点的暴露，带来了丰富的氧空位，提供了额外的活性位点，提高了Co3O4的电导率。因此，S-Co3O4在析氧反应（OER）中具有318 mV的过电位，在氧还原反应（ORR）中具有0.788 V的半波电位。此外，硫掺杂使原始Co3O4的ORR动力学电流密度增加了49倍。基于S-Co3O4阴极组装的ZABs比基于Pt/C + ruo2的ZABs具有更高的峰值功率密度（98.90 mW cm−2）。本研究表明，硫掺杂可以显著增强Co3O4的本征氧催化活性，从而改变其结构特征并引入结构缺陷。图形抽象

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.