1T/2H Mixed Phase MoS2 Nanosheets Integrated by a 3D Nitrogen-Doped Graphene Derivative for Enhanced Electrocatalytic Hydrogen Evolution,ACS Applied Materials & Interfaces

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1T/2H Mixed Phase MoS2 Nanosheets Integrated by a 3D Nitrogen-Doped Graphene Derivative for Enhanced Electrocatalytic Hydrogen Evolution
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-01 , DOI: 10.1021/acsami.0c16537
Xiaobei Zang ₁ , Yijiang Qin ₁ , Teng Wang ₁ , Fashun Li ₁ , Qingguo Shao ₁ , Ning Cao ₁

Affiliation

Molybdenum disulfide (MoS₂) has become one of the most promising non-platinum-based electrocatalysts for the hydrogen evolution reaction (HER) because of its unique layered structure. However, the catalytic performance of the thermodynamically stable MoS₂ is hindered by its poor conductivity and scarce active sites. We developed a 3D porous N-doped graphene derivative-integrated metal–semiconductor (1T-2H) mixed phase MoS₂ (MNG) using urea as a doping reagent. The highly exposed active sites were achieved by inducing the phase transition of MoS₂ from 2H phase to 1T phase and the inclusion of highly N-incorporated reduced graphene oxide, both of which were simultaneously realized by optimizing the concentration of the doping reagent. Moreover, the charge/proton transfer was enhanced by the well-designed porous architecture and hydrophilic 1T-MoS₂. With these advantages, the optimized MNG-40 catalyst has a small overpotential of 157 mV at a cathodic current density of 10 mA cm^–2, a relatively low Tafel slope of 45.8 mV dec^–1, and an excellent stability. This work represents a new strategy to design higher-performance HER catalysts and provides new insights into the structural regulation of metal composite transitions.

中文翻译：

1T / 2H混合相MoS ₂纳米片与3D氮掺杂石墨烯衍生物集成在一起，可增强电催化氢的释放

由于其独特的层状结构，二硫化钼（MoS ₂）已成为氢释放反应（HER）最有前途的基于非铂的电催化剂之一。但是，热力学稳定的MoS ₂的催化性能由于其差的电导率和稀缺的活性位而受到阻碍。我们使用尿素作为掺杂剂开发了3D多孔N掺杂石墨烯衍生物集成的金属半导体（1T-2H）混合相MoS ₂（MNG）。高度暴露的活性位点是通过诱导MoS ₂的相变而实现的从2H相到1T相，并加入高度掺入N的还原氧化石墨烯，这两者都是通过优化掺杂剂的浓度同时实现的。此外，通过精心设计的多孔结构和亲水性1T-MoS ₂增强了电荷/质子转移。凭借这些优势，经过优化的MNG-40催化剂在10 mA cm ^–2的阴极电流密度下具有157 mV的小过电位，相对较低的Tafel斜率dec ^–1的45.8 mV的Tafel斜率，以及出色的稳定性。这项工作代表了设计高性能HER催化剂的新策略，并为金属复合物过渡的结构调节提供了新见解。

更新日期：2020-12-16

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