TY - JOUR
T1 - Sulfur-Rich N-Doped Co9S8Catalyst for Highly Efficient and Durable Overall Water Electrolysis Application
AU - Ahmed, Abu Talha Aqueel
AU - Han, Jonghoon
AU - Shin, Giho
AU - Park, Sunjung
AU - Yeon, Seungun
AU - Park, Youngsin
AU - Kim, Hyungsang
AU - Im, Hyunsik
N1 - Publisher Copyright:
© 2023 Abu Talha Aqueel Ahmed et al.
PY - 2023
Y1 - 2023
N2 - Facile template-free controllable growth of freestanding polyhedron-like CoS onto microporous Ni foam with three-dimensional architecture via a mild hydrothermal technique is reported. The as-obtained CoS catalyst phase was first tailored to N-Co9S8 (nitrogen doped Co9S8), and its inherent reaction kinetics and conductivity were then enhanced through sulfur incorporation via a hydrothermal process. The electrochemical performance of the pristine CoS and a sulfur-enriched N-Co9S8 (S, N-Co9S8) electrode in alkaline 1.0 M KOH was examined. The optimized polyhedral S, N-Co9S8 structured catalyst exhibits significantly enhanced electrocatalytic activity for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). As a result, low overpotentials of 244 and -92 mV is required to achieve the current density of 10 mA cm-2 for the OER and HER, respectively. Furthermore, when the polyhedral S, N-Co9S8 catalyst was employed as a bifunctional catalyst in a two-electrode electrolyzer cell exhibiting a cell voltage of 1.549 V at 10 mA cm-2 and demonstrates excellent long-term (50 hrs.) chronopotentiometric electrolysis at various current rate, reveals excellent bifunctional OER and HER activities at different applied current densities. The superior OER and HER activities of the S, N-Co9S8 catalyst is result of the improved electronic conductivity and enhanced intrinsic reaction kinetics, which led to the enhanced electrocatalytically active sites after the incorporation of heteroatoms in the catalyst structure.
AB - Facile template-free controllable growth of freestanding polyhedron-like CoS onto microporous Ni foam with three-dimensional architecture via a mild hydrothermal technique is reported. The as-obtained CoS catalyst phase was first tailored to N-Co9S8 (nitrogen doped Co9S8), and its inherent reaction kinetics and conductivity were then enhanced through sulfur incorporation via a hydrothermal process. The electrochemical performance of the pristine CoS and a sulfur-enriched N-Co9S8 (S, N-Co9S8) electrode in alkaline 1.0 M KOH was examined. The optimized polyhedral S, N-Co9S8 structured catalyst exhibits significantly enhanced electrocatalytic activity for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). As a result, low overpotentials of 244 and -92 mV is required to achieve the current density of 10 mA cm-2 for the OER and HER, respectively. Furthermore, when the polyhedral S, N-Co9S8 catalyst was employed as a bifunctional catalyst in a two-electrode electrolyzer cell exhibiting a cell voltage of 1.549 V at 10 mA cm-2 and demonstrates excellent long-term (50 hrs.) chronopotentiometric electrolysis at various current rate, reveals excellent bifunctional OER and HER activities at different applied current densities. The superior OER and HER activities of the S, N-Co9S8 catalyst is result of the improved electronic conductivity and enhanced intrinsic reaction kinetics, which led to the enhanced electrocatalytically active sites after the incorporation of heteroatoms in the catalyst structure.
UR - http://www.scopus.com/inward/record.url?scp=85168005084&partnerID=8YFLogxK
U2 - 10.1155/2023/4176447
DO - 10.1155/2023/4176447
M3 - Article
AN - SCOPUS:85168005084
SN - 0363-907X
VL - 2023
JO - International Journal of Energy Research
JF - International Journal of Energy Research
M1 - 4176447
ER -