Jana Debu, Kolli Hema Kumari, Sabnam Subhashree, Das Samar K
School of Chemistry, University of Hyderabad, P.O. Central University, Hyderabad - 500046, India.
Chem Commun (Camb). 2021 Sep 28;57(77):9910-9913. doi: 10.1039/d1cc03605j.
NiCl·6HO ([Ni(HO)]Cl) does not show electrocatalytic hydrogen evolution reaction activity (HER) in an acidic aqueous medium as well as in neutral water. Interestingly, when [Ni(HO)] is present in a polyoxovanadate matrix, for example, in the compound K[Ni(HO)][VO]·4HO (1), it exhibits homogeneous electrocatalytic HER activity in an acidic aqueous solution with a turn over frequency of 2.1 s and an effective low overpotential of 127 mV at pH 2.3. Compound 1 is the first nickel-containing polyoxometalate catalyst for hydrogen production homogeneous electrocatalytic proton reduction without its decomposition under electrochemical conditions of HER.
六水合氯化镍（[Ni(H₂O)₆]Cl₂）在酸性水介质以及中性水中均未表现出电催化析氢反应活性（HER）。有趣的是，当[Ni(H₂O)₆]存在于多钒酸盐基质中时，例如在化合物K[Ni(H₂O)₆][V₁₀O₂₈]·4H₂O（1）中，它在酸性水溶液中表现出均相电催化HER活性，在pH 2.3时的周转频率为2.1 s⁻¹，有效低过电位为127 mV。化合物1是第一种用于制氢的含镍多金属氧酸盐催化剂，可在HER的电化学条件下进行均相电催化质子还原而不发生分解。
