AI Article Synopsis
- A new and efficient catalyst, FeCo/N-C, has been developed for use in metal-air batteries, utilizing low-cost, non-precious metals to enhance performance in oxygen reactions.
- The catalyst features a unique design where FeCo alloy is anchored on nitrogen-doped porous carbon, providing a highly porous structure that optimizes the exposure of active nanoparticles.
- This innovation shows exceptional results in specific capacity and power density for rechargeable zinc-air batteries, demonstrating its potential for commercial applications while benefiting from efficient production methods.
Article Abstract
Low-cost and high-efficiency non-precious metal-based oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) bifunctional catalysts are the key to promoting the commercial application of metal-air batteries. Herein, a highly efficient catalyst of FeCo alloy anchoring on the nitrogen-doped porous carbon hollow sphere (FeCo/N-C) is intelligently designed by spray pyrolysis (SP). The zinc in the SP-derived metal oxides and metal-organic framework volatilize at high temperature to construct a hierarchical porous structure with abundant defects and fully exposes the FeCo nanoparticles which uniformly anchor on the carbon substrate. In this structure, the coexistence of FeCo alloy and binary metal active sites (Fe-N/Co-N) guarantees the FeCo/N-C catalyst exhibiting an excellent half-wave potential (E ═ 0.84 V) superior to 20% Pt/C for ORR and a suppressed overpotential (280 mV) than RuO for OER. Assembled rechargeable Zn-air battery (RZAB) demonstrates a promising specific capacity of 807.02 mAh g, peak power density of 159.08 mW cm and durability without electrolyte circulation (550 h). This work proposes the design concept of utilizing an oxide core to in situ consume the porous carbon shell for anchoring metal active sites and construct defects, which benefits from spray pyrolysis in achieving precise control of the alloy structure and mass preparation.
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| http://dx.doi.org/10.1002/smll.202310318 | DOI Listing |
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