Promoting the Corrosion Resistance of Mo-FeCoP@MnOx/NF via Double Protection Mechanisms Toward Electrolysis of Seawater at Ampere-Level Current Density

Suyu Ge, Ping Cheng, Yun Zhao, Haibo Jin, Yuefeng Su, Ning Li, Jingbo Li, Zhiyong Xiong, Caihong Feng*, Daxin Shi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Producing hydrogen via seawater electrolysis is pivotal for addressing both energy and environmental crises. An industrial-current-density electrocatalyst consisting of Mo-doped FeCoP nanorods decorated with MnOx nanosheets is elaborately designed and grows in situ on nickel foam forming hierarchical Mo-FeCoP@MnOx/NF (M-FCP@MnOx/NF) for seawater electrolysis. Density functional theory calculations demonstrate that MnOx species remarkably reduce the adsorption capacity of Cl, which enhances the corrosion resistance and selectivity of M-FCP@MnOx/NF during seawater electrolysis. Moreover, incorporating high-valence Mo species forms a superficial electrostatic layer on electrocatalysts to repel Cl. Owing to its enhanced double protection mechanism and unique self-healing characteristics, M-FCP@MnOx/NF requires overpotentials of only 209 mV (HER) and 270 mV (OER) to reach a current density of ≈1.0 A cm−2 and maintains stable operation over 120 h during alkaline electrolysis of seawater. The colorimetric analysis indicates negligible ClO production post stability test, indicating that the OER selectivity approaches 100%.

Original languageEnglish
JournalSmall
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • Mo doping
  • corrosion resistance
  • electrolysis of seawater
  • high selectivity
  • industrial current density

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