二硫化钼尺寸对析氢、析氧反应的影响

IF 2.2 4区工程技术 Q3 ELECTROCHEMISTRY

Journal of electrochemical science and technology Pub Date : 2021-10-27 DOI:10.33961/jecst.2021.00710

G. Ghanashyam, H. Jeong

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引用次数: 7

摘要

二硫化钼(MoS 2)已被广泛用作氢析氧反应(HER和OER)双官能团活性的催化剂。在这里，我们研究了大小对MoS 2的HER和OER性能的影响。与较大尺寸(2µm和6µm)的MoS 2相比，最小尺寸(90 nm)的MoS 2在-10 mAcm -2和300 mAcm -2下的过电位最低，分别为-0.28 V和1.52 V, HER和OER的Tafel斜率最小，分别为151和176 mVdec -1。较好的HER和OER性能归因于高电化学活性表面积(6 × 10 -4 cm 2)和低电荷转移电阻(18.1 Ω)，证实了较小的MoS 2纳米片具有更好的催化行为。

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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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来源期刊

Journal of electrochemical science and technology ELECTROCHEMISTRY-

CiteScore

6.30

自引率

8.10%

发文量

期刊介绍： Covering fields: - Batteries and Energy Storage - Biological Electrochemistry - Corrosion Science and Technology - Electroanalytical Chemistry and Sensor Technology - Electrocatalysis - Electrochemical Capacitors & Supercapcitors - Electrochemical Engineering - Electrodeposition and Surface Treatment - Environmental Science and Technology - Fuel Cells - Material Electrochemistry - Molecular Electrochemistry and Organic Electrochemistry - Physical Electrochemistry - Solar Energy Conversion and Photoelectrochemistry