Issue 15, 2023

Decoupled alkaline water electrolysis by a K0.5MnO2-Ti mediator via K-ion insertion/extraction

Abstract

Conventional one-step water electrolyzers generate H2 accompanied by O2 evolution, and may cause gas mixing and high cell voltage inputs. Herein, using the potassium ion battery material of K0.5MnO2-Ti as a mediator, we effectively decoupled the H2 and O2 evolution of alkaline water electrolysis temporally, thereby achieving a membrane-free pathway for H2 production. As a mediator electrode for charge storage, the K0.5MnO2-Ti exhibited a stable capacity of 100 mA h gāˆ’1 at 0.1 A gāˆ’1 owing to the reversible K-ion insertion/extraction mechanism. The decoupled water electrolysis device exhibited the step voltages for hydrogen and oxygen production of 1.02 and 0.57 V at 5 mA, respectively. A nearly unity Faradaic efficiency and sustained production of pure H2 has been demonstrated at a constant current density. We anticipate that this mediator demonstrated here may provide a route for the practical application of the decoupling strategy.

Graphical abstract: Decoupled alkaline water electrolysis by a K0.5MnO2-Ti mediator via K-ion insertion/extraction

Supplementary files

Article information

Article type
Communication
Submitted
24 Oct 2022
Accepted
24 Jan 2023
First published
24 Jan 2023

Chem. Commun., 2023,59, 2138-2141

Decoupled alkaline water electrolysis by a K0.5MnO2-Ti mediator via K-ion insertion/extraction

X. Zheng, F. Lv, X. Liu, Z. Zheng and Y. Chen, Chem. Commun., 2023, 59, 2138 DOI: 10.1039/D2CC05775A

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