A restricted dynamic surface self-reconstruction toward high-performance of direct seawater oxidation

Ling Zhou, Daying Guo (), Lianhui Wu, Zhixi Guan, Chao Zou, Huile Jin, Guoyong Fang, Xi’an Chen () and Shun Wang ()
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Ling Zhou: Wenzhou University
Daying Guo: Wenzhou University
Lianhui Wu: Wenzhou University
Zhixi Guan: Wenzhou University
Chao Zou: Wenzhou University
Huile Jin: Wenzhou University
Guoyong Fang: Wenzhou University
Xi’an Chen: Wenzhou University
Shun Wang: Wenzhou University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The development of highly efficient electrocatalysts for direct seawater splitting with bifunctionality for inhibiting anodic oxidation reconstruction and selective oxygen evolution reactions is a major challenge. Herein, we report a direct seawater oxidation electrocatalyst that achieves long-term stability for more than 1000 h at 600 mA/cm2@η600 and high selectivity (Faraday efficiency of 100%). This catalyst revolves an amorphous molybdenum oxide layer constructed on the beaded-like cobalt oxide interface by atomic layer deposition technology. As demonstrated, a new restricted dynamic surface self-reconstruction mechanism is induced by the formation a stable reconstructed Co-Mo double hydroxide phase interface layer. The device assembled into a two-electrode flow cell for direct overall seawater electrolysis maintained at 1 A/cm2@1.93 V for 500 h with Faraday efficiency higher than 95%. Hydrogen generation rate reaches 419.4 mL/cm2/h, and the power consumption (4.62 KWh/m3 H2) is lower than that of pure water (5.0 KWh/m3 H2) at industrial current density.

Date: 2024
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DOI: 10.1038/s41467-024-46708-8

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