2026-04-19T08:11:21Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/94892024-07-27T00:05:14Zcom_10259_3844com_10259_5086com_10259_2604com_10259_5822col_10259_3845col_10259_5823
Repositorio Institucional de la Universidad de Burgos
author
Perez Antolin, Daniel
author
Sáez Bernal, Inés
author
Colina Santamaría, Álvaro
author
Ventosa Arbaizar, Edgar
2024-07-26T07:34:34Z
2024-07-26T07:34:34Z
2022-05
1388-2481
http://hdl.handle.net/10259/9489
10.1016/j.elecom.2022.107271
Aqueous rechargeable Zn–MnO2 batteries have been attracting increasing interest in recent years due to their relatively high energy density, non-toxicity, non-flammability, and low-cost. However, the battery chemistry still faces several challenges limiting the performance of some key performance indicators and preventing its commercial deployment. Among these, cycle stability and lifespan are important, especially for stationary energy applications, and require improvement. In this work, a spontaneous reaction between Zn metal and electrolytes evolving hydrogen and Zn ions is shown to drive the electrolyte pH towards alkaline conditions, which in turn hinders the reversible electrochemical reactions at both positive and negative electrodes. Proton release during the oxidation of a Mn2+ additive and promotion of the oxygen evolution reaction (OER) at the positive electrode by implementing a float-charging protocol (constant voltage at the end of the charging process) is proposed as a simple strategy to restore the initial pH. Using a pH indicator dissolved in the electrolyte and assembling the electrochemical cell in a spectrophotometer cuvette, the effect of floating voltage is evaluated in operando, allowing optimization of the floating voltage to enable the electrolyte pH to remain stable.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Zn corrosion
Electrolyte additive
pH changes
Release of protons
Float charging protocol
Float-charging protocol in rechargeable Zn–MnO2 batteries: Unraveling the key role of Mn2+ additives in preventing spontaneous pH changes
info:eu-repo/semantics/article
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URL
https://riubu.ubu.es/bitstream/10259/9489/1/Perez-ec_2022.pdf
File
MD5
71984133be9c41c7158bf030c09b76bb
3820564
application/pdf
Perez-ec_2022.pdf