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Topologically nontrivial 1T’-MoTe2 as highly efficient hydrogen evolution electrocatalyst
Journal of Physics: Materials ( IF 4.9 ) Pub Date : 2020-11-24 , DOI: 10.1088/2515-7639/abc40c
Yuan He 1, 2 , Mebrouka Boubeche 1, 2 , Yecheng Zhou 1 , Dong Yan 1 , Lingyong Zeng 1 , Xiaopeng Wang 1 , Kai Yan 3 , Huixia Luo 1
Affiliation  

Rational design and synthesis of low-cost noble-metal free electrode with high efficiency for hydrogen evolution reaction (HER) is crucial for the realization of eco-friendly hydrogen economy. Here, we report and design topologically nontrivial 1T’-MoTe2 single crystals as remarkable hydrogen evolution electrocatalyst. The catalytic 1T’-MoTe2 was controllably synthesized via solid-state reaction and then facilely exfoliated into nanosheets by isopropanol with the aid of sonication. The overpotentials at 10 mA cm−2( η 10) can reach 73 mV with a low Tafel slope of 46.3 mV dec−1, which are much lower than those reported by other preparation methods (η 10 > 300 mV, Tafel slope > 50 mV dec−1). The electrochemical impedance spectroscopy shows fast kinetics of 1T’-MoTe2 single crystal with low contact resistance of 0.3 Ω. Additionally, 1T’-MoTe2 single crystal also exhibits large electrochemical active surface area of 47.0 cm2, high turnover frequency of 1.02 s−1 at 0.4 V and excellent durability over 10 h in 0.5 M H2SO4( aq). This work reports 1T’-MoTe2 single crystal as an excellent candidate for HER, which makes it possible to fabricate other robust Te-derived HER electrocatalysts.



中文翻译:

拓扑简单的1T'-MoTe 2作为高效的析氢电催化剂

合理设计和合成高效的氢气发生反应(HER)的低成本无贵金属无电极对于实现生态友好型氢气经济至关重要。在这里,我们报告并设计拓扑学上不重要的1T'-MoTe 2单晶作为显着的析氢电催化剂。催化1T'-MoTe 2通过固相反应可控制地合成,然后在超声作用下通过异丙醇轻松剥离成纳米片。在10mA厘米的超电势-2η 10)可以达到73毫伏与46.3毫伏分解的低塔菲尔斜率-1,这是多少比从其它的制备方法报道降低(η 10> 300 mV,塔菲尔斜率> 50 mV dec -1)。电化学阻抗谱显示了1T'-MoTe 2单晶的快速动力学,其低接触电阻为0.3Ω 。另外,1T'-MoTe 2单晶还表现出47.0 cm 2的大电化学活性表面积,0.4 V时的高周转频率1.02 s -1和在0.5 MH 2 SO 4(aq)中10 h的优异耐久性。这项工作报道了1T'-MoTe 2单晶是HER的极好候选者,这使得制造其他坚固的Te衍生的HER电催化剂成为可能。

更新日期:2020-11-24
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