Design of Two-Dimensional, Ultrathin MoS2 Nanoplates Fabricated Within One-Dimensional Carbon Nanofibers With Thermosensitive Morphology: High-Performance Electrocatalysts For The Hydrogen Evolution Reaction
Design of Two-Dimensional, Ultrathin MoS2 Nanoplates Fabricated Within One-Dimensional Carbon Nanofibers With Thermosensitive Morphology: High-Performance Electrocatalysts For The Hydrogen Evolution Reaction
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具有热敏形貌的一维碳纳米纤维内制造的二维超薄 MoS2 纳米板的设计：用于析氢反应的高性能电催化剂
DOI：
10.1021/am505544g
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发表时间：
2014
影响因子：
9.5
通讯作者：
BaoChun Guo
中科院分区：
文献类型：
--
作者：
Han Zhu;FengLei Lyu;MingLiang Du;Ming Zhang;QingFa Wane;JuMing Yao;BaoChun Guo
在碳纳米纤维（CNFs）中制备了具有单层厚度、纳米尺度和丰富边缘的二维MoS 2纳米片。该策略为精确设计MoS 2纳米材料提供了明确的途径，在5至70 nm的横向尺寸范围内，控制MoS 2形态从纳米颗粒到纳米片以及从单层到多层结构的演变。碳纳米纤维在限制MoS 2纳米片的生长方面起着重要的作用，导致暴露的边缘位置的数量增加，同时阻碍MoS 2层的堆叠和聚集，并加速电子转移。嵌入在CNF中的MoS 2纳米片的受控生长被用来证明析氢反应（HER）中的结构依赖性催化活性。结果表明，增加的层数和横向尺寸的结果在HER活性的降低作为一般规则。单层MoS 2纳米片具有丰富的边缘和7.3 nm的横向尺寸，表现出最低的析氢反应过电位为93 mV（J= 10 mA/cm 2），最高的电流密度为80.3 mA/cm 2，在η = 300 mV和最小的塔菲尔斜率为42 mV/decade。MoS 2-CNFs混合物作为非贵金属催化剂的能力表明它们在与能源相关的电催化应用中的前景。
Two-dimensional MoS2nanoplates within carbon nanofibers (CNFs) with monolayer thickness, nanometer-scale dimensions and abundant edges are fabricated. This strategy provides a well-defined pathway for the precise design of MoS2nanomaterials, offering control over the evolution of MoS2morphology from nanoparticles to nanoplates as well as from mono- to several-layer structures, over a lateral dimension range of 5 to 70 nm. CNFs play an important role in confining the growth of MoS2nanoplates, leading to increases in the amount of exposed edge sites while hindering the stacking and aggregation of MoS2layers, and accelerating electron transfer. The controlled growth of MoS2nanoplates embedded in CNFs is leveraged to demonstrate structure-dependent catalytic activity in the hydrogen evolution reaction (HER). The results suggest that increases in the number of layers and the lateral dimension result in a decrease in HER activity as a general rule. Single-layer MoS2nanoplates with abundant edges and a lateral dimension of 7.3 nm demonstrated the lowest hydrogen evolution reaction overpotential of 93 mV (J= 10 mA/cm2), the highest current density of 80.3 mA/cm2at η = 300 mV and the smallest Tafel slope of 42 mV/decade. The ability of MoS2–CNFs hybrids to act as nonprecious metal catalysts indicates their promise for use in energy-related electrocatalytic applications.