Noble-metal-free tungsten oxide/carbon (WOx/C) hybrid nanowires for highly efficient hydrogen evolution.

Author(s) Liu, C.; Qiu, Y.; Xia, Y.; Wang, F.; Liu, X.; Sun, X.; Liang, Q.; Chen, Z.
Journal Nanotechnology
Date Published 2017 Nov 03
Abstract

Developing active, stable, and low-cost electrocatalysts to generate hydrogen is a great challenge in the fields of chemistry and energy. Nonprecious metal catalysts comprised of inexpensive and earth-abundant transition metals are regarded as a promising substitute for noble metal catalysts used in hydrogen evolution reaction (HER), but are still practically unfeasible mainly due to unsatisfactory activity and durability. Here we report a facile two-step preparation method for WOx nanowires with high concentration of oxygen vacancies (OVs) via calcination of W-polydopamine compound precursors. The resulting hybrid material possesses a uniform and ultralong 1D nanowires structure and a rough and raised surface, which can effectively improve the specific surface area. The products exhibit excellent performance for H2 generation: the required overpotentials for 1 and 10 mA cm(-2) are 18 and 108 mV, the Tafel slope is 46 mV/decade, and the electrochemically active surface area is estimated to be ∼77.0 m(2) g(-1). After 1000 cycles, the catalyst works well without significant current density drop. Our experimental results verified metallic transition metal oxides as superior non-Pt electrocatalysts for practical hydrogen evolution reactions.

DOI 10.1088/1361-6528/aa8613
ISSN 1361-6528
Citation Liu C, Qiu Y, Xia Y, Wang F, Liu X, Sun X, et al. Noble-metal-free tungsten oxide/carbon (WOx/C) hybrid nanowires for highly efficient hydrogen evolution. Nanotechnology. 2017;28(44):445403.

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