Ultradispersed and Single-Layered MoS2 Nanoflakes Strongly Coupled with Graphene: An Optimized Structure with High Kinetics for the Hydrogen Evolution Reaction
Ultradispersed and Single-Layered MoS2 Nanoflakes Strongly Coupled with Graphene: An Optimized Structure with High Kinetics for the Hydrogen Evolution Reaction
复制标题
与石墨烯强耦合的超分散单层 MoS2 纳米片：用于析氢反应的高动力学优化结构
DOI：
10.1021/acsami.7b12038
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发表时间：
2017
影响因子：
9.5
通讯作者：
Liu Yingju
中科院分区：
文献类型：
--
作者：
Huang Haoliang;Huang Junying;Liu Weipeng;Fang Yueping;Liu Yingju
As one of the most promising Pt alternatives for cost-effective hydrogen production, molybdenum disulfide (MoS2), although has been studied extensively to improve its electrocatalytic activity, suffers from scarce active sites, low conductivity, and lack of interaction with substrates. To this end, we anchor ultradispersed and single-layered MoS2nanoflakes on graphene sheets via a hybrid intermediate (MoOx–cysteine–graphene oxide), which not only confines the subsequent growth of MoS2on the graphene surface but also ensures the intimate interaction between Mo species and graphene at the initial stage. Mo–O–C bond and a possible residual MoO3–xlayer are proposed to comprise the interface bridging the two inherent incompatible phases, MoS2and graphene. This strongly coupled structure together with the highly exposed MoS2morphology accelerates the electron injection from graphene to the active sites of MoS2, and thus the hydrogen evolution reaction (HER) can achieve an overpotential of ∼275 mV at ∼−740 mA cm–2, and a Pt-like Tafel slope of ∼35 mV dec–1. Our results shed light on the indispensable role of interfacial interaction within semiconducting material–nanocarbon composites and provide a new insight into the actual activity of MoS2toward the HER.
