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https://hdl.handle.net/2440/136448
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Type: | Journal article |
Title: | Big to Small: Ultrafine Mo₂C Particles Derived from Giant Polyoxomolybdate Clusters for Hydrogen Evolution Reaction |
Other Titles: | Big to Small: Ultrafine Mo2C Particles Derived from Giant Polyoxomolybdate Clusters for Hydrogen Evolution Reaction |
Author: | Zhou, Z. Yuan, Z. Li, S. Li, H. Chen, J. Wang, Y. Huang, Q. Wang, C. Karahan, H.E. Henkelman, G. Liao, X. Wei, L. Chen, Y. |
Citation: | Small, 2019; 15(11) |
Publisher: | WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
Issue Date: | 2019 |
ISSN: | 1613-6810 1613-6829 |
Statement of Responsibility: | Zheng Zhou, Ziwen Yuan, Sai Li, Hao Li, Junsheng Chen, Yanqing Wang, Qianwei Huang, Cheng Wang, Huseyin Enis Karahan, Graeme Henkelman, Xiaozhou Liao, Li Wei, and Yuan Chen |
Abstract: | Due to its electronic structure, similar to platinum, molybdenum carbides (Mo₂C) hold great promise as a cost-effective catalyst platform. However, the realization of high-performance Mo₂C catalysts is still limited because controlling their particle size and catalytic activity is challenging with current synthesis methods. Here, the synthesis of ultrafine β-Mo₂C nanoparticles with narrow size distribution (2.5 ± 0.7 nm) and high mass loading (up to 27.5 wt%) on graphene substrate using a giant Mo-based polyoxomolybdate cluster, Mo₁₂₃ ((NH₄)₄₂ [Mo₁₂₃O₃₇₂(CH₃COO)₃₀(H₂O)₇₂]·10CH₃COONH₄ ·300H₂O) is demonstrated. Moreover, a nitrogen-containing polymeric binder (polyethyleneimine) is used to create Mo—N bonds between Mo₂C nanoparticles and nitrogen-doped graphene layers, which significantly enhance the catalytic activity of Mo₂C for the hydrogen evolution reaction, as is revealed by X-ray photoelectron spectroscopy and density functional theory calculations. The optimal Mo₂C catalyst shows a large exchange current density of 1.19 mA cm–² , a high turnover frequency of 0.70 s–¹ as well as excellent durability. The demonstrated new strategy opens up the possibility of developing practical platinum substitutes based on Mo₂C for various catalytic applications. |
Keywords: | graphene hydrogen evolution reaction molybdenum carbide polyoxomolybdate |
Rights: | © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/smll.201900358 |
Grant ID: | http://purl.org/au-research/grants/arc/FT160100107 http://purl.org/au-research/grants/arc/DP180102210 |
Published version: | http://dx.doi.org/10.1002/smll.201900358 |
Appears in Collections: | Chemical Engineering publications |
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