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W2C nanodots decorated CNT networks as highly efficient and stable electrocatalyst for hydrogen evolution in acidic and alkaline media

Abstract

Although the tungsten carbide (W2C) has long been reported as an excellent platinum-like catalyst, it is still challengeable to synthesize W2C as an electrocatalyst for highly efficient hydrogen evolution reaction (HER) due to its high onset overpotential, inevitable aggregation, lacking of scalable and controllable synthesis method. Here, we synthesize W2C nanodots decorated CNT networks via a facile and scalable spray-drying followed by carbonization process (W2C@CNT-S). It is demonstrated that such unique nanoarchitecture, constructed by ultrafine W2C nanodots homengously decorated on three-dimensional and conductive CNT skeleton, lead to expose abundant catalytic sites and promote highly efficient electron transfer and ion disffusion during HER process. As a result, in acidic and alkaline media, the optimized W2C@CNT-S hybrid exhibits terrific HER performance with very low onset overpotentials of only 60 and 40 mV (vs. RHE), very samll Tafel slopes of 57.4 and 56.2 mV dec-1, only 176 and 148 mV (vs. RHE) to obtain a current density of 10 mA cm-2, respectively; it also shows outstanding long-term durability even after 30 hours test in both acidic and alkaline media. This work presents an overview of low-cost and scalable spray-drying strategy to synthesize high-performance carbide-based electrocatalyst for hydrogen evolution.

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Publication details

The article was received on 20 Dec 2018, accepted on 10 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR10281C
Citation: Nanoscale, 2019, Accepted Manuscript

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    W2C nanodots decorated CNT networks as highly efficient and stable electrocatalyst for hydrogen evolution in acidic and alkaline media

    Y. Hu, B. Yu, W. Li, M. Ramadoss and Y. Chen, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR10281C

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