Fe/Fe3C particles encapsulated in hollow carbon nanoboxes for high performance zinc–air batteries

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-11-08 DOI:10.1039/d4dt02396j

Chuyun Huang, Wenyuan Zhang, Xuezhi Hu, Shiliang Fei, Fhulufhelo Nemangwele, Nnditshedzeni Eric Maluta, Yangsen Hu, Hui Lv, Pei Hu, Zhuo Peng

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Abstract

Zinc–air batteries are recognized for their environmental friendliness and high energy density; however, the slow kinetics of the oxygen reduction reaction (ORR) at the air electrode hinder their commercial viability. The research focuses on synthesizing cubic hollow carbon structures derived from Metal–Organic Frameworks (MOFs), which enhance catalytic performance through improved conductivity and mass transfer. The resulting Fe/Fe₃C/HCNB catalyst demonstrates a half-wave potential of 0.826 V for ORR and achieves a peak power density of 274 mW cm⁻² in zinc–air batteries, surpassing commercial Pt/C catalysts. Electrochemical impedance spectroscopy reveals that the hollow structure enhances hydrophilicity and reduces solution resistance, facilitating greater active site engagement in electrochemical reactions. The study concludes that the unique structural features of Fe/Fe₃C/HCNB significantly improve discharge performance and stability, positioning it as a promising alternative for zinc–air battery applications.

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封装在空心碳纳米盒中的铁/Fe3C 粒子用于高性能锌-空气电池

锌-空气电池因其环保性和高能量密度而广受认可；然而，空气电极氧还原反应（ORR）的缓慢动力学阻碍了其商业可行性。研究重点是合成由金属有机框架（MOFs）衍生的立方空心碳结构，通过改善导电性和传质来提高催化性能。由此产生的铁/Fe3C/HCNB 催化剂的 ORR 半波电位为 0.826 V，在锌-空气电池中的峰值功率密度达到 274 mW cm-2，超过了商用 Pt/C 催化剂。电化学阻抗光谱显示，中空结构增强了亲水性，降低了溶液阻力，从而促进了活性位点在电化学反应中的参与。研究得出结论，Fe/Fe3C/HCNB 的独特结构特征显著提高了放电性能和稳定性，使其成为锌-空气电池应用的一种有前途的替代品。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567