biostudies-literatureN SEngineering and Physical Sciences Research CouncilEuropean Regional Development Fund14654-14664https://www.ebi.ac.uk/biostudies/studies/S-EPMC8697857biostudies-literatureUnknown11(24)We present the facile synthesis of Ni/NiO nanocomposites, <i>via</i> a solution combustion methodology, where the composition of metallic Ni within NiO is controlled by varying the annealing time, from 4 minutes up to 8 hours. The various Ni/NiO nanocomposites are studied <i>via</i> electrically wiring them upon screen-printed graphite macroelectrodes by physical deposition. Subsequently their electrochemical activity, towards the oxygen evolution reaction (OER), is assessed within (ultra-pure) alkaline media (1.0 M KOH). An optimal annealing time of 2 hours is found, which gives rise to an electrochemical oxidation potential (recorded at 10 mA cm^-2) of 231 mV (<i>vs.</i> Ag/AgCl 1.46 <i>vs.</i> RHE). These values show the Ni/NiO nanocomposites to be significantly more electrocaRSC advancesFacile synthesis of Ni/NiO nanocomposites: the effect of Ni content in NiO upon the oxygen evolution reaction within alkaline media.PMC8697857EP/P007767/1EP/N0011877/1N SC MS ARowley-Neale SJHughes JPBanks CEAdarakatti PSfalseFacile synthesis of Ni/NiO nanocomposites: the effect of Ni content in NiO upon the oxygen evolution reaction within alkaline media.We present the facile synthesis of Ni/NiO nanocomposites, <i>via</i> a solution combustion methodology, where the composition of metallic Ni within NiO is controlled by varying the annealing time, from 4 minutes up to 8 hours. The various Ni/NiO nanocomposites are studied <i>via</i> electrically wiring them upon screen-printed graphite macroelectrodes by physical deposition. Subsequently their electrochemical activity, towards the oxygen evolution reaction (OER), is assessed within (ultra-pure) alkaline media (1.0 M KOH). An optimal annealing time of 2 hours is found, which gives rise to an electrochemical oxidation potential (recorded at 10 mA cm^-2) of 231 mV (<i>vs.</i> Ag/AgCl 1.46 <i>vs.</i> RHE). These values show the Ni/NiO nanocomposites to be significantly more electroca2021-01-01T00:00:00Z2021 Apr2025-04-04T09:00:21.558Z2025-04-04T09:00:21.558ZS-EPMC86978573542401710.1039/d0ra10597j