Cobalt oxide-based materials as non-PGM catalyst for HER in PEM electrolysis and in situ XAS characterization of its functional state

TY - JOUR

T1 - Cobalt oxide-based materials as non-PGM catalyst for HER in PEM electrolysis and in situ XAS characterization of its functional state

AU - Ampurdanés, J.

AU - Chourashiya, Muralidhar

AU - Urakawa, Atsushi

N1 - Publisher Copyright: © 2018 Elsevier B.V.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - The polymer electrolyte membrane (PEM)-based electrolysis technology is a promising mean to split water and store renewable energy in the form of clean fuel, hydrogen. However, its high price due to the use of platinum group metals (PGMs) as catalyst materials generally makes the technology cost-restrictive. Herein we present the performance evaluation of cobalt oxide in PEM electrolysis as cathode catalyst where hydrogen evolution reaction (HER) takes place. Performance comparison of non-PGM catalysts (CoO, Co3O4 and MoS2) revealed that better performance was attained with Co3O4 and it was further improved by mixing with an electrically conducting carbon material (Vulcan). An optimum amount of the carbon additive was found, and the best performance was recorded at 47 wt% Co3O4 over the total amount. At 2.05 V, 47 wt% Co3O4-based catalyst (0.55 A/cm2) outperformed 47 wt% MoS2-based one (0.51 A/cm2). More importantly, the performance of the former at 2.3 V (1.12 A/cm2) surpassed even that of Pt-black (1.11 A/cm2). In situ XAS study of the Co3O4-based material under PEM electrolysis conditions revealed dynamic interchange of Co3+ and Co2+ fractions, which was attributed to ultimately boost the HER performance.

AB - The polymer electrolyte membrane (PEM)-based electrolysis technology is a promising mean to split water and store renewable energy in the form of clean fuel, hydrogen. However, its high price due to the use of platinum group metals (PGMs) as catalyst materials generally makes the technology cost-restrictive. Herein we present the performance evaluation of cobalt oxide in PEM electrolysis as cathode catalyst where hydrogen evolution reaction (HER) takes place. Performance comparison of non-PGM catalysts (CoO, Co3O4 and MoS2) revealed that better performance was attained with Co3O4 and it was further improved by mixing with an electrically conducting carbon material (Vulcan). An optimum amount of the carbon additive was found, and the best performance was recorded at 47 wt% Co3O4 over the total amount. At 2.05 V, 47 wt% Co3O4-based catalyst (0.55 A/cm2) outperformed 47 wt% MoS2-based one (0.51 A/cm2). More importantly, the performance of the former at 2.3 V (1.12 A/cm2) surpassed even that of Pt-black (1.11 A/cm2). In situ XAS study of the Co3O4-based material under PEM electrolysis conditions revealed dynamic interchange of Co3+ and Co2+ fractions, which was attributed to ultimately boost the HER performance.

KW - Carbon

KW - CoO

KW - Hydrogen evolution reaction (HER)

KW - PEM water electrolysis

KW - X-ray absorption spectroscopy (XAS)

UR - http://www.scopus.com/inward/record.url?scp=85058701295&partnerID=8YFLogxK

U2 - 10.1016/j.cattod.2018.12.033

DO - 10.1016/j.cattod.2018.12.033

M3 - 文章

AN - SCOPUS:85058701295

SN - 0920-5861

VL - 336

SP - 161

EP - 168

JO - Catalysis Today

JF - Catalysis Today

ER -