CoMo heterohierarchical foam-structured cathode for anion exchange membrane water electrolyzer. (12th January 2022)

• Record Type: Journal Article
• Authors: Kim, Hyunki; Kim, Junhyeong; Guo, Wenwu; Han, Gyeong Ho; Hong, Seokjin; Park, Juhae; Jang, Ho Won; Kim, Soo Young; Ahn, Sang Hyun
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 4(2022)
• Page Start: 2093
• Page End: 2102
• Publication Date: 2022-01-12
• Subjects: Hydrogen evolution reaction -- Electrodeposition -- Heterohierarchical structure -- Cobalt–molybdenum; HER hydrogen evolution reaction -- CP carbon paper -- OER oxygen evolution reaction -- PEMWE proton exchange membrane water electrolyzer -- AEMWE anion exchange membrane water electrolyzer -- SCE saturated calomel electrode -- FESEM field-emission scanning electron microscopy -- XRD X-ray diffraction -- EDS energy-dispersive spectroscopy -- XPS X-ray photoelectron spectroscopy -- CV cyclic voltammetry -- RHE reversible hydrogen electrode; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.10.147
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: It is important to consider the synergy of heterostructures to improve the slow kinetics of water dissociation in the alkaline hydrogen evolution reaction (HER). Herein, we report a simple method to design a heterohierarchical CoMo catalyst. The CoMo catalyst was prepared by simple one-pot electrodeposition on carbon paper (CP). The CoMo/CP catalyst was optimized for the alkaline HER by controlling the electrodeposition bath conditions, potential, and time. The optimized catalyst shows the heterohierarchical structure containing the electrically conductive metallic Co in the bulk and Mo-incorporated Co containing Mo 4+ at the surface. It exhibited a lower HER overpotential of 0.11 V at −20 mA/cm 2 compared to those of the others owing to the synergetic effect of the between the Co and Mo incorporated Co. The results highlight the advantages of the simple method developed herein for the design of heterohierarchical catalysts. Graphical abstract: Image 1 Highlights: A heterohierarchical CoMo catalyst is fabricated on carbon paper. The optimized CoMo/CP shows a low HER overpotential of 0.11 V at −20 mA/cm 2 . A facile method is proposed to design the heterostructured catalyst.