Hydrothermal synthesis of 3D hierarchical MoSe2/NiSe2 composite nanowires on carbon fiber paper and their enhanced electrocatalytic activity for the hydrogen evolution reaction,Journal of Materials Chemistry A

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Hydrothermal synthesis of 3D hierarchical MoSe2/NiSe2 composite nanowires on carbon fiber paper and their enhanced electrocatalytic activity for the hydrogen evolution reaction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-08-23 00:00:00 , DOI: 10.1039/c7ta05352e
Long Zhang _{1,

2,

3,

4} , Tao Wang _{4,

5,

6,

7} , Lan Sun _{1,

2,

3,

4} , Yunjin Sun _{4,

8,

9,

10} , Tingwei Hu _{1,

2,

3,

4} , Kewei Xu _{1,

2,

3,

4,

11} , Fei Ma _{1,

2,

3,

4}

Affiliation

A facile two-step hydrothermal approach is adopted to synthesize 3D hierarchical MoSe₂/NiSe₂ composite nanowires (NWs) on a carbon fiber paper (CFP) skeleton for the electro-catalytic hydrogen evolution reaction (HER) by water splitting. The MoSe₂/NiSe₂ NWs are composed of 2D nanosheets, and they are uniformly and tightly distributed on CFP. The electrochemical measurement suggests that only an overpotential of 249 mV (vs. the RHE) is required to deliver a current density of 100 mA cm⁻² in 0.5 M H₂SO₄, which is lower by 56 and 96 mV as compared to MoSe₂ (305 mV) and NiSe₂ (345 mV). The Tafel slope of MoSe₂/NiSe₂ NWs is 46.9 mV dec⁻¹ and is substantially smaller than those of MoSe₂ (69.2 mV dec⁻¹) and NiSe₂ (68.8 mV dec⁻¹). The MoSe₂/NiSe₂ composite NW arrays exhibit remarkably enhanced activity because their 3D hierarchical structure could effectively suppress the aggregation or re-stacking of nanosheets and expose more active sites to participate in the HER. Moreover, the highly conductive NiSe₂ dispersed in nanosheets facilitates the transfer of electrons from the electrode to the active edges on MoSe₂ and further improves the activity.

中文翻译：

在碳纤维纸上水热合成3D分层MoSe ₂ / NiSe ₂复合纳米线及其增强的对氢释放反应的电催化活性

采用一种简便的两步水热方法，在碳纤维纸（CFP）骨架上合成3D分层MoSe ₂ / NiSe ₂复合纳米线（NWs ），通过水分解进行电催化放氢反应（HER）。MoSe ₂ / NiSe ₂ NW由2D纳米片组成，它们均匀而紧密地分布在CFP上。电化学测量表明，仅需249 mV（相对于RHE）的超电势即可在0.5 MH ₂ SO _4中提供100 mA cm ^-2的电流密度，与MoSe ₂相比分别降低了56和96 mV （305 mV）和NiSe ₂（345 mV）。MoSe ₂ / NiSe ₂ NW的塔菲尔斜率是46.9 mV dec ^-1，并且显着小于MoSe ₂（69.2 mV dec ^-1）和NiSe ₂（68.8 mV dec ^-1）的Tafel斜率。MoSe ₂ / NiSe ₂复合NW阵列显示出显着增强的活性，因为它们的3D分层结构可以有效地抑制纳米片的聚集或重新堆叠，并使更多的活性位点参与HER。此外，分散在纳米片中的高导电NiSe ₂有助于电子从电极转移到MoSe ₂上的活性边缘并进一步改善活动。

更新日期：2017-09-26

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