MoS2-graphene-CuNi2S4 nanocomposite an efficient electrocatalyst for the hydrogen evolution reaction
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Authors
Adarakatti, Prashanth ShivappaMahanthappa, Mallappa
Hughes, Jack
Rowley-Neale, Samuel J.
Smith, Graham
Siddaramannaq, Ashoka
Banks, Craig E.
Affiliation
Indian Institute of Science; REVA University; Manchester Metropolitan University; University of Chester; Dayananda Sagar UniversityPublication Date
2019-06-11
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We present a facile methodology for the synthesis of a novel 2D-MoS2, graphene and CuNi2S4 (MoS2-g-CuNi2S4) nanocomposite that displays highly efficient electrocatalytic activity towards the production of hydrogen. The intrinsic hydrogen evolution reaction (HER) activity of MoS2 nanosheets was significantly enhanced by increasing the affinity of the active edge sites towards Hþ adsorption using transition metal (Cu and Ni2) dopants, whilst also increasing the edge sites exposure by anchoring them to a graphene frame- work. Detailed XPS analysis reveals a higher percentage of surface exposed S at 17.04%, of which 48.83% is metal bonded S (sulfide). The resultant MoS2-g-CuNi2S4 nanocomposites are immobilized upon screen-printed electrodes (SPEs) and exhibit a HER onset potential and Tafel slope value of -0.05 V (vs. RHE) and 29.3 mV dec-1, respectively. These values are close to that of the polycrystalline Pt electrode (near zero potential (vs. RHE) and 21.0 mV dec-1, respectively) and enhanced over a bare/unmodified SPE (-0.43 V (vs. RHE) and 149.1 mV dec-1, respectively). Given the efficient, HER activity displayed by the novel MoS2-g-CuNi2S4/SPE electrochemical platform and the comparatively low associated cost of production for this nanocomposite, it has potential to be a cost-effective alternative to Pt within electrolyser technologies.Citation
Adarakatti, P. S., Mahanthappa, M., Hughes, J. P., Rowley-Neale, S. J., Smith, G. C., Siddaramannaq, A., & Banks, C. E. (2019). MoS2-graphene-CuNi2S4 nanocomposite an efficient electrocatalyst for the hydrogen evolution reaction. International Journal of Hydrogen Energy, 44(31), 16069-16078. https://doi.org/10.1016/j.ijhydene.2019.05.004Publisher
ElsevierType
ArticleISSN
0360-3199ae974a485f413a2113503eed53cd6c53
10.1016/j.ijhydene.2019.05.004
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