A Nickel Phosphine Complex as a Fast and Efficient Hydrogen Production Catalyst
journal contributionposted on 28.01.2015 by Lu Gan, Thomas L. Groy, Pilarisetty Tarakeshwar, Shobeir K. S. Mazinani, Jason Shearer, Vladimiro Mujica, Anne K. Jones
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Here we report the electrocatalytic reduction of protons to hydrogen by a novel S2P2 coordinated nickel complex, [Ni(bdt)(dppf)] (bdt = 1,2-benzenedithiolate, dppf = 1,1′-bis(diphenylphosphino)ferrocene). The catalysis is fast and efficient with a turnover frequency of 1240 s–1 and an overpotential of only 265 mV for half activity at low acid concentrations. Furthermore, catalysis is possible using a weak acid, and the complex is stable for at least 4 h in acidic solution. Calculations of the system carried out at the density functional level of theory (DFT) are consistent with a mechanism for catalysis in which both protonations take place at the nickel center.