TY - JOUR
T1 - Charge state modulation in metal-organic framework-based porous cobalt-incorporated nickel sulfide for efficient hydrogen evolution in anion exchange membrane water electrolyzer
AU - Choi, Hyeonggeun
AU - Jo, Seunghwan
AU - Lim, Hee Young
AU - Lee, Young Woo
AU - Sohn, Jung Inn
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/3
Y1 - 2024/3
N2 - For practical water electrolysis-based hydrogen production, the development of efficient electrocatalysts based on earth-abundant materials is highly desirable. Herein, metal-organic framework (MOF) derived Co-incorporated nickel sulfide (MD-Co/NiS2) is demonstrated as a promising hydrogen evolution reaction (HER) electrocatalyst in an anion exchange membrane water electrolyzer (AEMWE). The MD-Co/NiS2 exhibits a porous structure packed with numerous nanoparticles while maintaining the primary spherical morphology of the MOF, resulting in a large surface area with enhanced porosity. Furthermore, the reaction kinetics is enhanced by alleviating the charge polarization of Ni and S after Co incorporation. Owing to the integrated benefits of the geometrical and chemical structures, MD-Co/NiS2 requires a low overpotential of 117 mV with long-term stability for 50 h at a current density of 10 mA cm−2 in 1 M KOH. Moreover, AEMWE using MD-Co/NiS2 as a cathode catalyst requires a low cell voltage of 1.97 V at a high current density of 1 A cm−2, comparable to that of commercial Pt/C (2.01 V) and maintains cell performance for 50 h with a small potential increase of 55 mV.
AB - For practical water electrolysis-based hydrogen production, the development of efficient electrocatalysts based on earth-abundant materials is highly desirable. Herein, metal-organic framework (MOF) derived Co-incorporated nickel sulfide (MD-Co/NiS2) is demonstrated as a promising hydrogen evolution reaction (HER) electrocatalyst in an anion exchange membrane water electrolyzer (AEMWE). The MD-Co/NiS2 exhibits a porous structure packed with numerous nanoparticles while maintaining the primary spherical morphology of the MOF, resulting in a large surface area with enhanced porosity. Furthermore, the reaction kinetics is enhanced by alleviating the charge polarization of Ni and S after Co incorporation. Owing to the integrated benefits of the geometrical and chemical structures, MD-Co/NiS2 requires a low overpotential of 117 mV with long-term stability for 50 h at a current density of 10 mA cm−2 in 1 M KOH. Moreover, AEMWE using MD-Co/NiS2 as a cathode catalyst requires a low cell voltage of 1.97 V at a high current density of 1 A cm−2, comparable to that of commercial Pt/C (2.01 V) and maintains cell performance for 50 h with a small potential increase of 55 mV.
KW - Anion exchange membrane water electrolyzer
KW - Charge delocalization
KW - Hydrogen evolution reaction
KW - Metal-organic framework
KW - Transition metal chalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85184018449&partnerID=8YFLogxK
U2 - 10.1016/j.surfin.2024.103987
DO - 10.1016/j.surfin.2024.103987
M3 - Article
AN - SCOPUS:85184018449
SN - 2468-0230
VL - 46
JO - Surfaces and Interfaces
JF - Surfaces and Interfaces
M1 - 103987
ER -