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首页> 外文期刊>Catalysis science & technology >Probing into the effect of heterojunctions between Cu/Mo2C/Mo2N on HER performance
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Probing into the effect of heterojunctions between Cu/Mo2C/Mo2N on HER performance

机译：探讨之间的垂直的效果铜/ Mo2C Mo2N性能

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摘要

Hydrogen is one of the cleanest forms of energy and can solve several issues, including environmental pollution and depletion of fossil fuels. The hydrogen evolution reaction (HER), being a carbon-neutral process, can reduce the amount of carbon in the earth's atmosphere. Molybdenum based solids are among the most popular electrocatalysts, and have been explored extensively for HER processes as an alternative to platinum. Herein, we report a nanostructured electrocatalyst (CuMoCat) consisting of molybdenum carbide, molybdenum nitride, and elemental copper, forming a heterojunction within the composite. Copper doping into a molybdenum carbide/nitride composite not only facilitates the lowering of the overpotential but also enables the catalyst to perform at high current density. CuMoCat exhibits an overpotential of 82 mV for attaining a current density of 10 mA cm(-2) with a Tafel slope value of 33 mV dec(-1) and shows excellent stability of 3000 cycles in acidic media. A theoretical study reveals that Cu doping brings a change in the electronic properties of the catalyst, which improves the overall adsorption and desorption of hydrogen on the catalyst surface during the hydrogen evolution reaction. The free energy diagram for the 'Mo' and 'N' hydrogen adsorption sites of CuMoCat shows a shift of free energy making these more favourable for the HER with respect to the Mo/N sites of the un-doped catalyst.
机译：氢是最清洁的能源之一,可以解决一些问题,包括环境污染和消耗的化石燃料。作为一个碳中和过程,可以减少在地球大气层的碳量。基于钼的固体是最流行的electrocatalysts,一直在探索广泛的过程作为一种替代方法铂。electrocatalyst (CuMoCat)组成的碳化钼、氮化钼和铜元素,形成异质结复合。硬质合金/氮化硅复合不仅便利过电压也降低使催化剂高电流密度。mV的电流密度达到10马厘米(2)塔费尔斜率值的33个mV 12月(1)并展示了优秀的3000周期的稳定酸性介质。电子掺杂带来了变化性能的催化剂,提高了整体吸附和解吸的氢在氢催化剂表面进化的反应。“莫”和“N”氢吸附的网站CuMoCat显示了自由能做这些的一个转变她对更有利Mo / N un-doped催化剂的网站。

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