{"title":"二硫化钼尺寸对析氢、析氧反应的影响","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":"{\"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}","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}
Size Effects of MoS2 on Hydrogen and Oxygen Evolution Reaction
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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