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MoS2-graphene-CuNi2S4 nanocomposite an efficient electrocatalyst for the hydrogen evolution reaction
Adarakatti, Prashanth Shivappa Mahanthappa, Mallappa Hughes, Jack Rowley-Neale, Samuel J. Smith, Graham Siddaramannaq, Ashoka Banks, Craig E.
Adarakatti, Prashanth Shivappa
Mahanthappa, Mallappa
Hughes, Jack
Rowley-Neale, Samuel J.
Smith, Graham
Siddaramannaq, Ashoka
Banks, Craig E.
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EPub Date
Publication Date
2019-06-11
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Abstract
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.2019.05.004
Publisher
Elsevier
Journal
International Journal of Hydrogen Energy
Research Unit
DOI
10.1016/j.ijhydene.2019.05.004
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PubMed Central ID
Type
Article
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Series/Report no.
ISSN
0360-3199