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Carbon-encapsulated multi-phase nanocomposite of W2C@WC1−x as a highly active and stable electrocatalyst for hydrogen generation

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Abstract

The major challenges related to the activity, stability, and cost of electrocatalysts are being increasingly raised to achieve highly efficient and cost-effective hydrogen generation. Herein, multiphase nanocomposites of W2C@WC1−x encapsulated within graphitic carbon layers were prepared via a facile and effective process of electrical explosion of wires and subsequent heat treatment to serve as a highly active and stable electrocatalyst without any noble metal for hydrogen generation. The single-phase comprising less than 15 nm WC1−x nanoparticles embedded in a lump of amorphous carbon were successfully synthesized via the EEW process in oleic acid used as a carbon source at room temperature. Subsequent heat treatment facilitates the desired phase transition of WC1−x to W2C without the formation of any secondary phases, maintaining the initial particle size and simultaneously eliminating excess amorphous carbon adhered to the nanoparticles. The few graphitic carbon layer-encapsulated nanoparticles with the main W2C phase prepared by this simple method exhibit high efficiency for hydrogen generation with a low overpotential of 240 mV at a current density of 10 mA cm−2 and a low Tafel slope of 86 mV dec−1. Moreover, the overpotential is well maintained at a constantly injected current density of 10 mA cm−2 for 100 h with a low η100/ηi value of 1.03 (ηi: initial overpotential, η100: overpotential after 100 h), demonstrating superior catalytic stability in acidic media. This work proposes and evaluates a facile strategy for the synthesis of highly efficient electrocatalysts based on metal carbides without noble metals.

Graphical abstract: Carbon-encapsulated multi-phase nanocomposite of W2C@WC1−x as a highly active and stable electrocatalyst for hydrogen generation

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Publication details

The article was received on 05 Sep 2018, accepted on 30 Oct 2018 and first published on 30 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR07221C
Citation: Nanoscale, 2018, Advance Article
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    Carbon-encapsulated multi-phase nanocomposite of W2C@WC1−x as a highly active and stable electrocatalyst for hydrogen generation

    I. Kim, S. Park and D. Kim, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR07221C

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