500-mW cm−2 underwater Zn-H2O2 batteries with ultrafine edge-enriched electrocatalysts

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-07-17 DOI:10.1007/s40843-024-2990-1

Meng Zhou (, ), Kui Fu (, ), Yihai Xing (, ), Jianling Liu (, ), Fancheng Meng (, ), Xiangfeng Wei (, ), Jiehua Liu (, )

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Abstract

Aqueous metal-H₂O₂ cells are emerging as power batteries because of their large theoretical energy densities and multiple application scenarios, especially in underwater environments. However, the peak power densities are less than 300 mW cm⁻² for most reported metal-H₂O₂ cells based on Mg/Al or their alloys due to the self-corrosion. Herein, we reported a Zn-H₂O₂ cell with ultrafine bean-pod-like ZnCo/N-doped electrocatalysts that were synthesized via multifunctional single-cell-chain biomass. The electrocatalyst provides abundant active sites on the crinkly interface and offers a shortened pathway for electron/ion transfer due to the desired root-like carbon nanotube (CNT) arrays. Therefore, the optimized electrocatalyst exhibited outstanding oxygen reduction reaction (ORR) activity, with high E_1/2 (0.90 V) and E_onset (1.01 V) values. More importantly, Zn-H₂O₂ batteries achieve a record-breaking peak-power density of 510 mW cm⁻² and a high specific energy density of 953 Wh kg⁻¹.

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采用超细边缘富集电催化剂的 500 mW cm-2 水下 Zn-H2O2 电池

水基金属-H2O2 电池因其理论能量密度大、应用场景多（尤其是在水下环境中）而成为新兴的动力电池。然而，由于自腐蚀，大多数已报道的基于镁/铝或其合金的金属-H2O2 电池的峰值功率密度低于 300 mW cm-2。在此，我们报告了一种采用超细豆荚状 ZnCo/N 掺杂电催化剂的 Zn-H2O2 电池，该催化剂是通过多功能单细胞链生物质合成的。这种电催化剂在皱缩界面上提供了丰富的活性位点，并且由于采用了所需的根状碳纳米管（CNT）阵列，缩短了电子/离子转移的路径。因此，优化后的电催化剂表现出卓越的氧还原反应（ORR）活性，具有较高的 E1/2 值（0.90 V）和 Eonset 值（1.01 V）。更重要的是，Zn-H2O2 电池的峰值功率密度达到了破纪录的 510 mW cm-2，比能量密度高达 953 Wh kg-1。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.