Meticulous tuning of nonprecious catalysts for overall water splitting is highly challenging but it is one of the most promising routes toward the future hydrogen economy. Here, we present a highly active, robust and earth abundant NiCoP electrocatalyst with a tuning capacity to excel in both oxygen and hydrogen evolution reactions. The composition of Ni and Co has been varied in a facile two-step method to produce coral-like NiCoP. The variant Ni0.25Co0.75 P has shown remarkable OER activity with overpotential as low as 240 mV at 10 mA/cm2 current density and Tafel slope of 68 mV dec−1 in alkaline medium. On the other hand, Ni0.75Co0.25P exhibited commendable HER performance with an overpotential of 120 mV and a Tafel slope of 123 mV dec−1 in an acid medium. Long-term durability and minimal loading of the catalyst ascertain the significance of the present catalyst. Moreover, our theoretical study finds that NiCoP provides a much higher electron density of d-states near the Fermi level compared to the individual metal phosphide and the low-index surface (100) of composite phosphide has a moderate level of desorption energy of oxygen and hydrogen compared to that of NiP2 & CoP corroborating the superiority of NiCoP in OER/HER performance.
CITATION STYLE
Gan, P. K., Pal, A., Rizvi, S., Kumari, N., Kar, M., & Chatterjee, K. (2024). Tuneable and coral-like NiCoP for enhanced oxygen and hydrogen evolution reaction. Materials Today Communications, 38. https://doi.org/10.1016/j.mtcomm.2024.108063
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