journal article·2017-04-25

Molybdenum Carbide-Embedded Nitrogen-Doped Porous Carbon Nanosheets as Electrocatalysts for Water Splitting in Alkaline Media

Chenbao Lu, Diana Tranca, Jian Zhang, Fermı́n Rodrı́guez Hernández, Yuezeng Su, Xiaodong Zhuang, Fan Zhang, Gotthard Seifert, Xinliang Feng

ACS Nano· Volume 11· Issue 4
Publisher page

Abstract

Molybdenum carbide (Mo 2 C) based catalysts were found to be one of the most promising electrocatalysts for hydrogen evolution reaction (HER) in acid media in comparison with Pt-based catalysts but were seldom investigated in alkaline media, probably due to the limited active sites, poor conductivity, and high energy barrier for water dissociation. In this work, Mo 2 C-embedded nitrogen-doped porous carbon nanosheets (Mo 2 C@2D-NPCs) were successfully achieved with the help of a convenient interfacial strategy. As a HER electrocatalyst in alkaline solution, Mo 2 C@2D-NPC exhibited an extremely low onset potential of ∼0 mV and a current density of 10 mA cm –2 at an overpotential of ∼45 mV, which is much lower than the values of most reported HER electrocatalysts and comparable to the noble metal catalyst Pt. In addition, the Tafel slope and the exchange current density of Mo 2 C@2D-NPC were 46 mV decade –1 and 1.14 × 10 –3 A cm –2, respectively, outperforming the state-of-the-art metal-carbide-based electrocatalysts in alkaline media. Such excellent HER activity was attributed to the rich Mo 2 C/NPC heterostructures and synergistic contribution of nitrogen doping, outstanding conductivity of graphene, and abundant active sites at the heterostructures.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced Photocatalysis Techniques · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

School of Electronic Information and Electrical Engineering, School of Aeronautics and Astronautics, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

Center for Advancing Electronics Dresden (cfaed) & Department of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstrasse 4, 01062 Dresden, Germany

Theoretical Chemistry, Technische Universität Dresden, Mommsenstrasse 13, 01062 Dresden, Germany

DynAMoS (Dynamical processes in Atomic and Molecular Systems), Facultad de Fı́sica, Universidad de La Habana, San Lázaro y L, 10040 La Habana, Cuba

Funding

Ministry of Science and Technology of the People's Republic of China · Deutsche Forschungsgemeinschaft · Horizon 2020 Framework Programme · National Natural Science Foundation of China · H2020 European Research Council · State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University · Shanghai Committee of Science and Technology

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