Nanoemulsion-Coated Ni-Fe Hydroxide Self-Supported Electrode as an Air-Breathing Cathode for High-Performance Zinc-Air Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 35587778.
- Also identified by DOI 10.1021/acs.nanolett.2c01388.
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Abstract
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 dip-coating the aerophilic perfluorochemical compounds (PFC) and amphiphilic ionomers into the self-supported electrodes, (1) the high solubility of O<sub>2</sub> in the PFC nanoemulsions greatly increases triple-phase boundaries and facilitates the efficient supply/removal of O<sub>2</sub> 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<sup>-2</sup> and a narrow discharge/charge gap of 0.64 V at 10 mA cm<sup>-2</sup> and a long-cycling durability (over 1000 h). This work provides a universal approach to promote gas-evolving reactions for electrochemical applications.