Kinetically induced one-step heterostructure formation of Co3O4-Ni (OH)2-graphene ternary nanocomposites to enhance oxygen evolution reactions

Ternary Co3O4-Ni(OH)(2)-graphene hybrid nanocomposites (NCs) can be fabricated using a facile, room temperature kinetic spray process in a single step. The fabricated heterostructure electrodes are optimized to enhance the oxygen evolution reaction (OER) in 1.0 M KOH. The deposited films exhibit a mixture of nanosheet and nanoflake morphologies. Raman spectra reveal improvements in various disorder-related modes in the hybrid NCs due to the nanometer scale and the transformation of graphite-stacked layers into thin graphene nanosheets. X-ray photoelectron spectra indicate that strong synergy improvements in the heterostructure NCs are associated with a downshift of the active state's binding energies. Optimal Co3O4-Ni (OH)(2)-graphene hybrid ternary NCs exhibit the smallest OER overpotential of 262 mV @ 10 mA.cm(-2), the lowest Tafel slope of 32 mV.c(-1), and long-term stability of 25 h at a polarization current of 50 mAmiddo.cm(-2). (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

Ternary Co3O4-Ni(OH)(2)-graphene hybrid nanocomposites are synthesized using a facile kinetic spray process, resulting in enhanced oxygen evolution reaction performance. The optimized heterostructure exhibits nanosheet and nanoflake morphologies, with improvements in disorder-related modes and downshift of binding energies. The best synthesized material demonstrates excellent OER performance and long-term stability.