Bimetallic metal organic framework-derived Co9S8-MoS2 nanohybrids as an efficient dual functional electrocatalyst towards the hydrogen and oxygen evolution reactions

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 130; pp. 317 - 323
• Main Authors: Lee, Suok, Park, Yeonsu, Lim, HeeYoung, Son, Sangjun, Cho, Younghyun, Park, Jong Bae, Cho, Hyun-Seok, Jang, A-Rang, Lee, Young-Woo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.02.2024; 한국공업화학회
• Subjects: Co9S8; Hydrogen evolution reaction; MoS2; Nanohybrids; Oxygen evolution reaction; 화학공학; MoS2; GCE; Hydrogen evolution reaction; Nanohybrids; Oxygen evolution reaction; XRD; EIS; LSV; RHE; HRTEM; Co9S8; CV; HER; FE-SEM; XPS; OER
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2023.09.035

[Display omitted] Electrochemical water splitting is promising system for the efficient hydrogen production. Much effort has been devoted to developing cost-effective, catalytically active, and stable electrocatalysts for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). In this work, we synthesized Co9S8-MoS2 nanohybrid structures derived from CoMo-based bimetallic metal–organic frameworks via a one-pot hydrothermal route followed by sulfurization. Co9S8-MoS2 nanohybrids, composed of small Co9S8-MoS2 core–shell nanospheres covered by large Co9S8/MoS2 nanostructures, are efficient electrocatalysts for both the HER and OER owing to their porous bimetallic structures with large number of surface area and numerous catalytically active sites. The Co9S8-MoS2 nanohybrids show small overpotentials of 110 and 270 mV at 10 mA cm−2 in 1.0 M KOH for the HER and OER, respectively. Furthermore, even after 1000 cycles, the Co9S8-MoS2 nanohybrids exhibited good stability and small Tafel slopes of 59 and 66 mV dec−1 for both the HER and OER, respectively, demonstrating their potential in practical applications for water splitting.