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Iron-assisted engineering of molybdenum phosphide nanowires on carbon cloth for efficient hydrogen evolution at a wide pH range

Abstract

Exploring active, cost-effective and stable non-noble electrocatalysts for efficient hydrogen evolution is essential for sustainable energy systems. In this work, we report the synthesis of a molybdenum phosphide nanowires on carbon cloth (MoP NWs/CC) by a facile iron-assisted strategy as robust hydrogen evolution catalyst with high activity. Results reveal that the addition of iron can promote the vertical growth of ferrum molybdenum oxide (Fe-Mo-O) nanowires precursor on carbon cloth and the morphological maintenance during in situ gas-solid phosphidation process, which plays a key role in engineering the morphology of catalysts. As a novel 3D hydrogen evolution cathode, the as-obtained MoP NWs/CC electrode exhibits a low onset potential of 72 mV, low overpotential of 173 mV for high current density of 100 mA cm-2, a small Tafel slope of 53.3 mV dec-1, and superior durability in acidic electrolyte. Additionally, this electrode also displays considerable HER activity and promising stability under alkaline and neutral media. Such outstanding HER activity for MoP NWs/CC can be ascribed to its unique nanowires morphology with large surface area to exposing ample active sites and superior charge transport kinetics. Importantly, our work develops a facile and effective approach for regulating the morphology of transition-metal phosphides.

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Publication details

The article was received on 08 Sep 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07895A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Iron-assisted engineering of molybdenum phosphide nanowires on carbon cloth for efficient hydrogen evolution at a wide pH range

    Y. Teng, X. Wang, H. Chen, J. Liao, W. Li and D. Kuang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07895A

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