Shit, Subhasis Chhetri, Suman Fang, Wooree Murmu, Naresh C. Koo, Hyeyoung Samanta, Pranab Kuila, Tapas 2024-01-19T22:02:35Z 2024-01-19T22:02:35Z 2022-01-10 2018-08-22 1944-8244 https://pubs.kist.re.kr/handle/201004/121025 Fabrication of high-performance noble-metal-free bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in water is a promising strategy toward future carbon-neutral economy. Herein, a one-pot hydrothermal synthesis of cobalt sulfide/nickel sulfide heterostructure supported by nickel foam (CoSx/Ni3S2@ NF) was performed. The Ni foam acted as the three-dimensional conducting substrate as well as the source of nickel for Ni3S2. The formation of CoSsx/Ni3S2@NF was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. The formation of CoSx/Ni3S2@NF facilitated easy charge transport and showed synergistic electrocatalytic effect toward HER, OER, and overall water splitting in alkaline medium. Remarkably, CoSx/Ni3S2@NF showed catalytic activity comparable with that of benchmarking electrocatalysts Pt/C and RuO2. For CoS,INi3S2@NF, overpotentials of 204 and 280 mV were required to achieve current densities of 10 and 20 mA cm(-2) for HER and OER, respectively, in 1.0 M KOH solution. A two-electrode system was formulated for overall water splitting reaction, which showed current densities of 10 and 50 mA cm(-2) at 1.572 and 1.684 V, respectively. The prepared catalyst exhibited excellent durability in HER and OER catalyzing conditions and also in overall water splitting operation. Therefore, CoSx/Ni3S2@NF could be a promising noble-metal-free electrocatalyst for overall water splitting application. English American Chemical Society OXYGEN EVOLUTION REACTION NI3S2 NANOSHEET ARRAYS HYDROGEN EVOLUTION NI-FOAM BIFUNCTIONAL ELECTROCATALYST NANOWIRE ARRAYS ACTIVE ELECTROCATALYST ENHANCED ACTIVITY ALKALINE MEDIA ELECTRODE Cobalt Sulfide/Nickel Sulfide Heterostructure Directly Grown on Nickel Foam: An Efficient and Durable Electrocatalyst for Overall Water Splitting Application Article 10.1021/acsami.8b04223 1 ACS Applied Materials & Interfaces, v.10, no.33, pp.27712 - 27722 ACS Applied Materials & Interfaces 10 33 27712 27722 scie scopus 000442706600018 2-s2.0-85050776803 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article OXYGEN EVOLUTION REACTION NI3S2 NANOSHEET ARRAYS HYDROGEN EVOLUTION NI-FOAM BIFUNCTIONAL ELECTROCATALYST NANOWIRE ARRAYS ACTIVE ELECTROCATALYST ENHANCED ACTIVITY ALKALINE MEDIA ELECTRODE hydrogen evolution reaction oxygen evolution reaction bifunctional electrocatalyst overall water splitting heterostructure