{"title":"Size Effects of MoS2 on Hydrogen and Oxygen Evolution Reaction","authors":"G. Ghanashyam, H. Jeong","doi":"10.33961/jecst.2021.00710","DOIUrl":null,"url":null,"abstract":"Molybdenum disulfide (MoS 2 ) has been widely used as a catalyst for the bifunctional activities of hydrogen and oxygen evolution reactions (HER and OER). Here, we investigated size dependent HER and OER performance of MoS 2 . The smallest size (90 nm) of MoS 2 exhibits the lowest overpotential of -0.28 V at -10 mAcm -2 and 1.52 V at 300 mAcm -2 with the smallest Tafel slopes of 151 and 176 mVdec -1 for HER and OER, respectively, compared to bigger sizes (2 µm and 6 µm) of MoS 2 . The better HER and OER performance is attributed to high electrochemical active surface area (6 × 10 -4 cm 2 ) with edge sites and low charge transfer resistance (18.1 Ω), confirming that the smaller MoS 2 nanosheets have the better catalytic behavior.","PeriodicalId":15542,"journal":{"name":"Journal of electrochemical science and technology","volume":" ","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2021-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of electrochemical science and technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.33961/jecst.2021.00710","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
引用次数: 7
Abstract
Molybdenum disulfide (MoS 2 ) has been widely used as a catalyst for the bifunctional activities of hydrogen and oxygen evolution reactions (HER and OER). Here, we investigated size dependent HER and OER performance of MoS 2 . The smallest size (90 nm) of MoS 2 exhibits the lowest overpotential of -0.28 V at -10 mAcm -2 and 1.52 V at 300 mAcm -2 with the smallest Tafel slopes of 151 and 176 mVdec -1 for HER and OER, respectively, compared to bigger sizes (2 µm and 6 µm) of MoS 2 . The better HER and OER performance is attributed to high electrochemical active surface area (6 × 10 -4 cm 2 ) with edge sites and low charge transfer resistance (18.1 Ω), confirming that the smaller MoS 2 nanosheets have the better catalytic behavior.
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