Pumping Electrons from Oxygen-Bridged Cobalt for Low-Charging-Voltage Zn-Air Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 39432866.
- Also identified by DOI 10.1021/acs.nanolett.4c03510.
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Abstract
Reducing the charging voltage is a prerequisite for improving the chargeability and energy efficiency of Zn-air batteries (ZABs). Herein, Fe<sup>3+</sup> pumps electrons from oxygen-bridged cobalt (Fe-O-Co) and induces the accelerated charging kinetics. For the liquid ZABs, a charging voltage of around 1.94 V at 10 mA cm<sup>-2</sup> was displayed, which slightly increased 2% after continuous cycles for 180 h. A steady charging voltage of around 1.87 V at 10 mA cm<sup>-2</sup> was also exhibited for quasi-solid-state ZABs. Control experiments and characterization show that the interactions between the O<sup>2-</sup> and Fe<sup>3+</sup> sites are relatively weaker than those between the O<sup>2-</sup> and Co<sup>3+</sup> sites. Compared with Mn<sup>3+</sup>, Zn<sup>2+</sup>, and Cu<sup>2+</sup>, Fe<sup>3+</sup> effectively pumps electrons from Co sites to generate the active species for the oxygen evolution reaction. Thus, the deprotonation behavior and *OH conversion were improved. This work demonstrates the oxygen electron bridge modulated electron transfer between dual metal sites, contributing to the improvement of low-charging-voltage ZABs.