4.8 Article

Nanoemulsion-Coated Ni-Fe Hydroxide Self-Supported Electrode as an Air-Breathing Cathode for High-Performance Zinc-Air Batteries

Journal

NANO LETTERS
Volume 22, Issue 11, Pages 4535-4543

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c01388

Keywords

Ionomer; oxygen reduction reaction; mass transfer; zinc-air batteries

Funding

  1. National Key R&D Program of China [2020YFB1505602, 2018YFE0202001]
  2. National Natural Science Foundation of China [21776154]

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The study proposes an air-breathing strategy to improve the energy conversion efficiency and durability of zinc-air batteries (ZABs) by significantly enlarging triple-interfaces. By dipcoating the aerophilic perfluorochemical compounds (PFC) and amphiphilic ionomers into the self-supported electrodes, the study demonstrates high power density and long-cycling durability for the ZABs.
To improve the energy conversion efficiency and durability of zinc-air batteries (ZABs) for large-scale implementations, here we propose an air-breathing strategy to significantly enlarge triple-interfaces with intensified mass transfer. By dipcoating the aerophilic perfluorochemical compounds (PFC) and amphiphilic ionomers into the self-supported electrodes, (1) the high solubility of O-2 in the PFC nanoemulsions greatly increases triple-phase boundaries and facilitates the efficient supply/removal of O-2 from the electrolyte; (2) the ionomers with hydrophobic and hydrophilic functionalities enable fast gas, water, and ion transport to the triple-phase boundaries; and (3) the self-supported electrode without binder ensures fast electron transfer while the firm integration prevents catalyst shedding. By applying this strategy, the ZABs show a high power density of 115 mW cm(-2) and a narrow discharge/charge gap of 0.64 V at 10 mA cm(-2) and a long-cycling durability (over 1000 h). This work provides a universal approach to promote gas-evolving reactions for electrochemical applications.

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