Accelerated deprotonation with a hydroxy-silicon alkali solid for rechargeable zinc-air batteries

Yaobin Wang, Xinlei Ge, Qian Lu (), Wenjun Bai, Caichao Ye (), Zongping Shao () and Yunfei Bu ()
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Yaobin Wang: Nanjing University of Information Science and Technology (NUIST)
Xinlei Ge: Nanjing University of Information Science and Technology (NUIST)
Qian Lu: Nanjing University of Information Science and Technology (NUIST)
Wenjun Bai: Southern University of Science and Technology
Caichao Ye: Southern University of Science and Technology
Zongping Shao: Curtin University
Yunfei Bu: Nanjing University of Information Science and Technology (NUIST)

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Transition metal oxides are promising electrocatalysts for zinc-air batteries, yet surface reconstruction caused by the adsorbate evolution mechanism, which induces zinc-ion battery behavior in the oxygen evolution reaction, leads to poor cycling performance. In this study, we propose a lattice oxygen mechanism involving proton acceptors to overcome the poor performance of the battery in the OER process. We introduce a stable solid base, hydroxy BaCaSiO4, onto the surfaces of PrBa0.5Ca0.5Co2O5+δ perovskite nanofibers with a one-step exsolution strategy. The HO-Si sites on the hydroxy BaCaSiO4 significantly accelerate proton transfer from the OH* adsorbed on PrBa0.5Ca0.5Co2O5+δ during the OER process. As a proof of concept, a rechargeable zinc-air battery assembled with this composite electrocatalyst is stable in an alkaline environment for over 150 hours at 5 mA cm–2 during galvanostatic charge/discharge tests. Our findings open new avenues for designing efficient OER electrocatalysts for rechargeable zinc-air batteries.

Date: 2023
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DOI: 10.1038/s41467-023-42728-y

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