期刊
MATERIALS CHEMISTRY FRONTIERS
卷 5, 期 19, 页码 7315-7322出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qm00885d
关键词
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资金
- National Natural Science Foundation of China [51772135, 51872124]
- Natural Science Key Foundation of Guangdong Province [2019B1515120056]
- Ministry of Education of China [6141A02022516]
- Natural Science Foundation of Guangdong Province [2021A1515010504, 2014A030306010]
- Natural Science Foundation of Guangzhou [201904010049]
- Jinan University [88016105]
- Innovation Team Project of Foshan City [FS0AA-KJ919-4402-0086]
- Fundamental Research Foundation for the Central Universities [11619103]
A novel 3D NiFe/MG aerogel was developed as a cathode material for wearable Zn-air batteries, exhibiting superior bifunctional activity. The aerogel possesses a large specific surface area, abundant functional groups, and excellent conductivity, promoting the diffusion of electrolyte and electron transfer.
Insufficient catalytic activity and self-restacking of 2D MXenes during catalytic processes would lead to a limited number of active sites, sluggish ionic kinetics and poor durability, extremely restricting their application in Zn-air batteries (ZABs). Herein, a facile and moderate synthetic path is reported for the synthesis of a 3D porous framework, Nb2C MXene/reduced graphene oxide aerogel coupled with NiFe alloy nanoparticles (NiFe/MG) as a cathode in wearable ZABs. The large specific surface area, abundant functional groups (O, -OH, and -F), porosity and rich channels of 3D NiFe/MG aerogel are beneficial for increasing the number of active sites, facilitating the diffusion of electrolyte and promoting transference of electrons. As a result, the NiFe/MG electrocatalyst achieves outstanding bifunctional activity delivering an indicator Delta E of 0.79 V, which is superior to the state-of-the-art commercial Pt/C + IrO2 benchmark (Delta E = 0.84 V). Specifically, the as-assembled wearable ZAB exhibits a remarkable peak power density (96.1 mW cm(-2)), long-term durability and outstanding mechanical stability. This study provides an ingenious strategy to promote the application of 3D MXene-based bifunctional electrocatalysts for metal-air batteries.
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