Electrocatalytic Hydrogen Evolution Reaction on Edges of a Few Layer Molybdenum Disulfide Nanodots

被引:282
作者
Benson, John [1 ]
Li, Meixian [2 ]
Wang, Shuangbao [3 ,4 ]
Wang, Peng [3 ,4 ]
Papakonstantinou, Pagona [1 ]
机构
[1] Univ Ulster, Engn Res Inst, Sch Engn, Newtownabbey BT37 0QB, Antrim, North Ireland
[2] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
[3] Nanjing Univ, Natl Lab Solid State Microstruct, Coll Engn & Appl Sci, Nanjing 210093, Jiangsu, Peoples R China
[4] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
关键词
MoS2; nanosheets; hydrogen evolution reaction; electrocatalysis; edges; nanodots; ionic liquid exfoliation; water splitting; DENSITY-FUNCTIONAL THEORY; EFFICIENT ELECTROCATALYSTS; SULFIDE NANOPARTICLES; ULTRATHIN NANOSHEETS; GRAPHENE NANOSHEETS; OXYGEN-REDUCTION; MOS2; NANOSHEETS; IONIC LIQUIDS; MONOLAYER; SIZE;
D O I
10.1021/acsami.5b03399
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The design and development of inexpensive highly efficient electrocatalysts for hydrogen production underpins several emerging clean-energy technologies. In this work, for the first time, molybdenum disulfide (MoS2) nanodots have been synthesized by ionic liquid assisted grinding exfoliation of bulk platelets and isolated by sequential centrifugation. The nanodots have a thickness of up to 7 layers (similar to 4 nm) and an average lateral size smaller than 20 nm. Detailed structural characterization established that the nanodots retained the crystalline quality and low oxidation states of the bulk material. The small lateral size and reduced number of layers provided these nanodots with an easier path for the electron transport and plentiful active sites for the catalysis of hydrogen evolution reaction (HER) in acidic electrolyte. The MoS2 nanodots exhibited good durability and a Tafel slope of 61 mV dec(-1) with an estimated onset potential of -0.09 V vs RHE, which are considered among the best values achieved for 2H phase. It is envisaged that this work may provide a simplistic route to synthesize a wide range of 2D layered nanodots that have applications in water splitting and other energy related technologies.
引用
收藏
页码:14113 / 14122
页数:10
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