Self-supported anodic film of Fe(III) redox center doped Ni-Co Prussian blue analogue frameworks with enhanced catalytic activity towards overall water electrolysis

Abstract

This work report s on in-situ doping of Fe(III) redox centers to Ni-Co based Prussian blu e analogu e framework films and their eletrocatalytic performance towards water splitting i n t o molecular hydrogen and oxygen. Uniform and self-supported films of frameworks ar e deposited onto nickel substrate via anodization in 80 vol % glycerol based aqueous electro l y t e contai n i n g 0.1 M K-3[Co(CN)(6)] with/without addition of a sma l l amount of [Fe(CN)(6)](3-) as doping precursor. XRD, HR-TEM, STEM and XPS characterization of the fi l m confirmed the doping. Notably, the doped film demonstrated an enhanced electrocatalytic activity towards hydrogen and oxygen evolution reaction in alkaline electrolyte with sma l l overpotentials of 169 and 263 mV, respectively to derive the benchmark current density of 10 mAcm(- 2). In addition, bu l k electrolysis at 10 mAcm- 2 demonstrated an improved and well-maintained long-term electrochemical durability of the doped film-based cathode and anode for over a l l splitting of water.