Hybridized Heterostructure of Cos and Mos2 Nanoparticles for Highly-Efficient and Robust Bifunctional Water Electrolysis
For industrial hydrogen production, it is beneficial to develop highly-efficient, earth-abundant, and bifunctional electrocatalysts which exhibit compatibility between oxygen evolution reaction (OER) or hydrogen evolution reaction (HER) activity and stability in the same electrolyte. Herein, we report a bifunctional hybrid CoS/MoS2 nanoparticle electrocatalyst in 1M KOH, fulfilling desirable industrial criteria for water electrolysis. The CoS/MoS2 catalyst exhibits excellent OER and HER activities with very low overpotentials as well as outstanding stability for more than 100 hours, even at a high current density of 250 mA cm–2. The bifunctional CoS/MoS2 catalyst-based water-electrolyzer exhibits a low cell voltage of 1.52 V at 10 mA cm–2 (1.714 V at 100 mA cm–2) with long–term stability. Density functional theory calculations reveal that the hybrid CoS/MoS2 electrocatalyst shows one–way electron transfer that can activate both oxidative/reductive reactions; therefore, it exhibits superior OER and HER activities, outperforming the state-of-the-art noble-metal-free catalysts
Year of publication: |
[2022]
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Authors: | Im, Hyunsik ; Aqueel Ahmed, Abu Talha ; Lee, Chi Ho ; Han, Jonghoon ; Park, Sunjung ; Ansari, Abu Saad ; Cho, Sangeun ; Pawar, S. M. ; Seol, Jaehun ; Lee, Sang Uck ; Kim, Hyungsang |
Publisher: |
[S.l.] : SSRN |
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