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High-Content Metallic 1T Phase in MoS2-Based Electrocatalyst for Efficient Hydrogen Evolution
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-07-07 00:00:00 , DOI: 10.1021/acs.jpcc.7b03103 Liang Cai 1 , Weiren Cheng 1 , Tao Yao 1 , Yuanyuan Huang 1 , Fumin Tang 1 , Qinghua Liu 1 , Wei Liu 1 , Zhihu Sun 1 , Fengchun Hu 1 , Yong Jiang 1 , Wensheng Yan 1 , Shiqiang Wei 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-07-07 00:00:00 , DOI: 10.1021/acs.jpcc.7b03103 Liang Cai 1 , Weiren Cheng 1 , Tao Yao 1 , Yuanyuan Huang 1 , Fumin Tang 1 , Qinghua Liu 1 , Wei Liu 1 , Zhihu Sun 1 , Fengchun Hu 1 , Yong Jiang 1 , Wensheng Yan 1 , Shiqiang Wei 1
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Realizing high-efficiency hydrogen evolution in cost-effective and long-lasting electrocatalysts is critical for global production of clean and sustainable chemical fuels. Here, via modulating the metallic 1T phase in 2H MoS2 nanosheets, we greatly improved the conductivity and effective active sites for highly efficient electrocatalytic hydrogen evolution. The as-synthesized 1T-2H MoS2 electrocatalyst with a high 1T-phase content of 50% can significantly increase the charge concentration by an order of magnitude and triple the effective active surface sites, successfully boosting the hydrogen evolution reaction (HER) at a quite low overpotential of 126 mV at 10 mA/cm2 and a small Tafel slope of 35 mV/dec. Ultraviolet photoelectron spectroscopy and electrochemical characterization reveal that the valence band edges of 1T-2H MoS2 are upshifted by 0.15–0.36 eV, which obviously enhances the charge transfer ability of the surface active sites in the basal plane of MoS2 for high HER performance.
中文翻译：
MoS 2基电催化剂中高含量的金属1T相可有效释放氢气
在经济高效且持久的电催化剂中实现高效的氢气释放对于全球清洁，可持续的化学燃料生产至关重要。在这里，通过调节2H MoS 2纳米片中的金属1T相，我们极大地提高了电导率和有效的活性位点，以高效地电催化制氢。刚合成的1T相含量为50％的1T-2H MoS 2电催化剂可以显着提高电荷浓度一个数量级，并使有效活性表面位点增加三倍，从而成功地促进了氢气在1℃时的析氢反应（HER）。 10 mA / cm 2时非常低的126 mV过电势和35mV / dec的小Tafel斜率。紫外光电子能谱和电化学表征表明，1T-2H MoS 2的价带边缘上移了0.15-0.36 eV，这明显增强了MoS 2基面中表面活性位点的电荷转移能力，从而具有较高的HER性能。
更新日期：2017-07-08
中文翻译：
MoS 2基电催化剂中高含量的金属1T相可有效释放氢气
在经济高效且持久的电催化剂中实现高效的氢气释放对于全球清洁，可持续的化学燃料生产至关重要。在这里，通过调节2H MoS 2纳米片中的金属1T相，我们极大地提高了电导率和有效的活性位点，以高效地电催化制氢。刚合成的1T相含量为50％的1T-2H MoS 2电催化剂可以显着提高电荷浓度一个数量级，并使有效活性表面位点增加三倍，从而成功地促进了氢气在1℃时的析氢反应（HER）。 10 mA / cm 2时非常低的126 mV过电势和35mV / dec的小Tafel斜率。紫外光电子能谱和电化学表征表明，1T-2H MoS 2的价带边缘上移了0.15-0.36 eV，这明显增强了MoS 2基面中表面活性位点的电荷转移能力，从而具有较高的HER性能。
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