3 years ago

N-doped graphene supported WxC composite material as an efficient non-noble metal electrocatalyst for hydrogen evolution reaction

N-doped graphene supported WxC composite material as an efficient non-noble metal electrocatalyst for hydrogen evolution reaction
Tungsten carbides materials exhibit highly efficient activity for hydrogen evolution reaction (HER) as promising non-precious electrocatalysts. Herein, a N-doped graphene (NG) supported tungsten carbides composite material (W x C/NG-10, x =1, 2, x is stoichiometric number of W, 10 is the mole quantity of tungsten in the precursors, mmol) was directly synthesized with a simple method by two-step calcining the mixture of sodium tungstate dihydrate (Na2WO4·2H2O), dicyandiamide (DCDA) and glucose anhydrous (GA), which was characterized by HRTEM, FE-SEM, XRD, XPS, EDX, BET and Raman, and estimated the electrocatalytic activity by the LSV, Tafel curves, and electrochemical impedance spectrum (EIS). The investigations indicate that W x C/NG-10, as an electrocatalyst for HER, achieves a lower overpotential of only 77.82mV at the current density of 10mAcm−2 and a Tafel slope of 45.95mVdec−1 in 0.5molL−1 H2SO4 aqueous. Additionally, the W x C/NG-10 has also possessed an electrocatalytic oxygen evolution reaction (OER) activity in 1.0molL−1 KOH aqueous with a lower overpotential of 467.6mV and a Tafel slope of 36.2mVdec−1. And after 10000 cycles the electrocatalytic active of W x C/NG-10 decrease 24.63% and 19.35% for HER and OER, respectively. The modification of W x C has improved the activity of NG materials in electrocatalytic applications.

Publisher URL: www.sciencedirect.com/science

DOI: S001346861731811X

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