Ambient plasma treated molybdenum disulfide as bifunctional electrocatalysts

• Published in: Chemical physics letters Vol. 794; p. 139492
• Main Authors: Ghanashyam, Gyawali, Kyung Jeong, Hae
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2022
• Subjects: Ambient plasma; Electrolysis; Hydrogen evolution reaction; Molybdenum disulfide; Oxygen evolution reaction; Hydrogen evolution reaction; Ambient plasma; Molybdenum disulfide; Oxygen evolution reaction; Electrolysis
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2022.139492

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•Ambient plasma treatment on MoS2 for bifunctional electrocatalysts.•Time dependent plasma treatment on MoS2 for optimal time.•Low overpotential of −0.18 V at −10 mAcm−2 for HER with Tafel slope of 95 mVdec−1.•Low overpotential of 1.40 V at 10 mAcm−2 for OER with Tafel slope of 65 mVdec−1..
Molybdenum disulfide (MoS2) is modified by using ambient solution plasma for hydrogen and oxygen evolution reactions (HER and OER). The modified MoS2 exhibits low overpotential of −0.18 V at −10 mAcm−2 for HER and 1.40 V at 10 mAcm−2 for OER with Tafel slope of 95 and 65 mVdec−1, respectively. The improved HER and OER performance is attributed to increased electrochemical active surface area and reduced impedance compared to precursor MoS2. The effect of time dependent plasma treatment on MoS2 is also investigated, indicating that the optimal time (90 min) shows better HER and OER performance.