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Efficient homogeneous electrocatalytic hydrogen evolution using a Ni-containing polyoxometalate catalyst
Debu Jana1, Hema Kumari Kolli1, Subhashree Sabnam1
1School of Chemistry, University of Hyderabad, P.O. Central University, Hyderabad - 500046, India. skdas@uohyd.ac.in.
Abstract:
NiCl2·6H2O ([Ni(H2O)6]2Cl2) per se does not show electrocatalytic hydrogen evolution reaction activity (HER) in an acidic aqueous medium as well as in neutral water. Interestingly, when [Ni(H2O)6]2+ is present in a polyoxovanadate matrix, for example, in the compound K2[Ni(H2O)6]2[V10O28]·4H2O (1), it exhibits homogeneous electrocatalytic HER activity in an acidic aqueous solution with a turn over frequency of 2.1 s-1 and an effective low overpotential of 127 mV at pH 2.3. Compound 1 is the first nickel-containing polyoxometalate catalyst for hydrogen production via homogeneous electrocatalytic proton reduction without its decomposition under electrochemical conditions of HER.
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