Structure design of MoS 2 @Mo 2 C on nitrogen-doped carbon for enhanced alkaline hydrogen evolution reaction
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Structure design of MoS2@Mo2C on nitrogen-doped carbon for enhanced alkaline hydrogen evolution reaction Lina Jia1,2, Bitao Liu1,2,* , Yaru Zhao1,*, Wenbo Chen2, Dedan Mou2, Junchao Fu2, Yiya Wang2, Wang Xin1, and Lei Zhao1,* 1 2
College of Physics and Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji 721016, People’s Republic of China Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
Received: 20 May 2020
ABSTRACT
Accepted: 12 August 2020
Non-precious metal-based electrocatalyst with high activity and stability for efficient hydrogen evolution reaction (HER) is of critical importance toward low-cost and large-scale water splitting. Traditional MoS2 has electrocatalytic hydrogen evolution inertness in alkaline environment, which is detrimental to the adsorption and dissociation of water. Composited with electrocatalyst with good electrical conductivity can enhance its HER activity. In this work, we for the first time construct a carbon-supported hollow heterostructure MoS2@Mo2C composite via two-step calcination and sulfurized process from carbonized Mo2C–Mo3C2 heteronanowires. The results show that the existence of the Mo3C2 phase is the key point to construct the effective heterostructure with hollow morphology. Due to the strong negative hydrogen binding energy for H on surface of Mo2C, the H? reduction in the MoS2@Mo2C in the Volmer step can be enhanced. Compared with MoS2, MoS2@Mo2C has high electrocatalytic activity for hydrogen evolution with an onset potential of 28 mV, overpotential of 129 mV at the current density of 10 mA cm-2, a small Tafel slope of 78 mV dec-1, and an excellent stability. This work will provide new insights into the design of high-efficiency HER catalysts via interfacial engineering at nanoscale for commercial water splitting.
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Springer Science+Business
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https://doi.org/10.1007/s10853-020-05107-2
J Mater Sci
GRAPHIC ABSTRACT
Introduction Recently, with the development of human society and the rapid growth of global population, the growing demand for energy has become one of the most important factors affecting human life [1–3]. With the deterioration of the environment and the depletion of fossil energy, people are increasingly aware of the importance of sustainable development and the development of new-type energy sources that are recyclable and environmentally friendly has become the focus of global research [4]. In many new forms of energy sources, hydrogen has received much more attention as a new-type energy with high efficiency, cleanliness, and high utilization value [5]. The key issue concerning the development of hydrogen energy is the efficient storage and simple preparation [6]. Electrocatalysts, as one of the important components of the electrolyzer, significantly affect the efficiency of hydrogen evolution. Unfortunat
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