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Boosting high-current water electrolysis: Superhydrophilic/superaerophobic nanosheet arrays of NiFe LDH with oxygen vacancies in situ grown on iron foam by Qian Li; Qitao Chen; Kun Jiang; Sufen Lei; Yilin Deng; Jian Bao is a Engineering article available to read on EtoBox.

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Developing cost-effective and superior bifunctional electrocatalysts for alkaline water splitting is crucial to realizing hydrogen economy. However, in industrial applications, especially at high current densities, the sluggish kinetic process and the dissatisfactory prolonged stability of electrocatalysts astrict their applications. Herein, the superhydrophilic/superhydrophobic NiFe layered double hydroxide (LDH) with oxygen vacancies was designed in situ grown on iron foam (NiFe/IF) as a high-performance bifunctional electrocatalyst. The unique feature of the superhydrophilic/superaerophobic surface makes for electrolyte penetration and bubbles release, and the existence of oxygen vacancies grants the catalyst with enhanced inherent catalytic activity. Moreover, in situ Raman analysis reveals NiFe LDH could undergo surface reconstruction into active NiOOH species in the electrooxidation environment. Profiting from the above superiorities, the prepared NiFe/IF displays superior OER activity in 1 M KOH with low overpotentials of 245.2, and 480.2 mV to supply 100 and 1000 mA cm−2, respectively. And the NiFe/IF exhibits prominent stability at 1000 mA cm−2 under a simulated industrial

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Author

Qian Li; Qitao Chen; Kun Jiang; Sufen Lei; Yilin Deng; Jian Bao

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)