In situ growth of Ni(OH)2-porous nitrogen-doped graphene composite onto Ni foam support as advanced electrochemical supercapacitors materials

High-surface-area Ni(OH)₂-porous nitrogen-doped graphene (Ni(OH)₂@p-NG) composite was electro-synthesized via a facile co-electrochemical/electrophoretic deposition method. The microscopic results revealed the formation of beta-nickel hydroxide nanoparticles uniformly grown onto porous N-doped graphene. BET findings indicated that the fabricated composite has high surface area of 289.3 m² g⁻¹ where the pristine hydroxide showed only 74.6 m² g⁻¹. The electrochemical data revealed that the composite/NF electrode is able to deliver specific capacity of 1642 F g⁻¹ at 10 A g⁻¹ and high-rate performance of 74.4% with increasing the applied load from 0.5 to 10 A g⁻¹. While pristine Ni(OH)₂/NF electrode exhibited lower capacity of 951 F g⁻¹ at 10 A g⁻¹ and weak capacity retention of 53.1% at high applied loads. Furthermore, composite electrode showed a remarkable cycling stability of 85.8% after 7000 cycles at 10 A g⁻¹ vs 63% for the pristine Ni(OH)₂/NF.