J, J.Jayalakshmi, D.Rodney, J.D.2026-02-042023International Journal of Hydrogen Energy, 2023, 48, 38, pp. 14287-142983603199https://doi.org/10.1016/j.ijhydene.2022.12.291https://idr.nitk.ac.in/handle/123456789/21915Electrochemical water electrolyser though an assuring solution for clean hydrogen production, the sluggish kinetics and high cost of existing precious metal electrocatalyst remains a barrier to its effective utilization. Herein, solution combustion route derived perovskite type barium nickelate (BaNiO<inf>3</inf>) nanoparticles were developed and studied for their bifunctional electrocatalytic properties towards overall water splitting. The unannealed BaNiO<inf>3</inf> nanoparticles exhibited the highest OER and HER activity with overpotentials 253 mV and 427 mV respectively to attain 10 mAcm−2 in 1.0 M KOH. Using unannealed BaNiO<inf>3</inf> as a bifunctional electrocatalyst in a two-electrode alkaline electrolyser, the cell was able to achieve the benchmark current density at a low cell voltage of 1.82 V. Impressively the setup's electrocatalytic performance improved 4.9% after continuous overall water splitting for 24 h at 30 mAcm−2. Therefore, BaNiO<inf>3</inf> nanoparticles can be a low-cost and efficient alternative for noble metal electrocatalysts for clean H<inf>2</inf> production. © 2022 Hydrogen Energy Publications LLCBarium compoundsBenchmarkingCombustionElectrocatalystsHydrogen productionMetal nanoparticlesPerovskitePotassium hydroxidePrecious metalsBifunctional electrocatalystsElectrochemicalsHigh costsHydrogen evolution reactionsOverall water splittingPerovskite typeSluggish kineticsSolution combustionWater electrolyserWater splittingOxygen