基于 MXene@ZIFs 衍生物的可充电锌-空气电池高效阴极催化剂。

IF 7.5 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2024-11-05 DOI:10.1002/cssc.202401200
Fei Zhao, Li Kang, Jilan Long, Keyu Chen, Simeng Ding
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引用次数: 0

摘要

氧还原反应(ORR)和氧进化反应(OER)是锌-空气电池阴极的关键过程。开发高效耐用的空气阴极电催化剂对于锌-空气充电电池的实际应用意义重大。本文通过在二维材料 MXene(Ti2C3)的表面和夹层上生长 CoNi-ZIF 并进行磷化煅烧,合成了含有 Co2P/Ni2P 纳米颗粒的 N 掺杂层状 MX。CoNi-ZIF 在 MXene 表面的生长减弱了 MXene 的高温结构损伤,进而形成了具有分层构型、更高电子传导性和丰富活性位点的 Co2P/Ni2P@MX。优化后的 Co2P/Ni2P@MX 在 ORR 中的半波电位为 0.85 V,在 OER 中的过电位为 345 mV。此外,还采用 DFT 计算研究了原子和分子水平的机理。以 Co2P/Ni2P@MX 为阴极的液态锌-空气电池的比容量为 783.7 mAh g-1,循环稳定性超过 280 h(840 次),优于以商用 Pt/C+RuO2 为阴极构建的锌-空气电池和其他先前的研究成果。此外,用 Co2P/Ni2P@MX 作为阴极合成的固态电池具有稳定的循环性能(154 小时/462 次循环)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Efficient Cathode Catalyst for Rechargeable Zinc-air Batteries based on the Derivatives of MXene@ZIFs.

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are crucial processes at the cathode of zinc-air batteries. Developing highly efficient and durable electrocatalysts at the air cathode is significant for the practical application of rechargeable zinc-air batteries. Herein, N-doped layered MX containing Co2P/Ni2P nanoparticles is synthesized by growing CoNi-ZIF on the surface and interlayers of the two-dimensional material MXene (Ti2C3) followed by phosphating calcination. The growth of CoNi-ZIF on the surface of MXene results in the attenuation of high-temperature structural damage of MXene, which in turn leads to the formation of Co2P/Ni2P@MX with a hierarchical configuration, higher electron conductivity, and abundant active sites. The optimized Co2P/Ni2P@MX achieves a half-wave potential of 0.85 V for the ORR and an overpotential of 345 mV for the OER. In addition, DFT calculations were adopted to investigate the mechanism at the atomic and molecular levels. The liquid zinc-air battery with Co2P/Ni2P@MX as the cathode exhibits a specific capacity of 783.7 mAh g-1 and exceeds 280 h (840 cycles) cycle stability, superior to zinc-air batteries constructed by the cathode of commercial Pt/C+RuO2 and other previous works. Furthermore, a solid-state battery synthesized with Co2P/Ni2P@MX as the cathode exhibits stable cycle performance (154 h/462 cycles).

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来源期刊
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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