Zinc (Zn) metal anodes suffer from the dendrite growth and hydrogen evolution reaction (HER) in classical aqueous electrolytes, which severely limit their lifespan. We propose a rational design of AgxZny protective coatings with selective binding to Zn2+ against H+ to simultaneously regulate the Zn growth pattern and the HER kinetics. We further demonstrate that by tuning the composition of the AgxZny coating the Zn deposition behavior can be readily tuned from the conventional plating/stripping (on Zn-AgZn3 coating) to alloying/dealloying (on Ag-AgZn coating), resulting in precise control of the Zn growth pattern. Moreover, the synergy of Ag and Zn further suppresses the competitive HER. As a result, the modified Zn anodes possess a significantly enhanced lifespan. This work provides a new strategy for enhancing the stability of Zn and potentially other metal anodes by precisely manipulating the binding strength of protons and metal charge carriers in aqueous batteries.
Bibliographical noteKAUST Repository Item: Exported on 2023-07-11
Acknowledgements: This work was supported by the National Natural Science Foundation of China (Grant Nos.: 22001081, 22075236), the Science and Technology Projects of Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM, Grant No.: HRTP--7), the Science and Engineering Research Board through the Early Career Research Award, India (grant ECR/2018/001583/ES), and King Abdullah University of Science and Technology (KAUST).
ASJC Scopus subject areas
- Materials Science(all)
- Mechanical Engineering
- Condensed Matter Physics