One-pot synthesized mesoporous Ni–Co hydroxide for high performance supercapacitors

Mesoporous Ni(OH) 2 /Co(OH) 2 electrode materials were synthesized via a simple one-pot procedure by combining homogeneous precipitation and stepwise precipitation method. The configuration of the porous Ni(OH) 2 /Co(OH) 2 electrode materials synthesized provides 3D electron transmission channels through a high conductive Co(OH) 2 distributed in the peripheral nanolayer of the composites, which is beneficial to rate capability and cycle stability. The Ni(OH) 2 /Co(OH) 2 electrode materials have a specific surface area of 229 m 2 g −1 , which is approximately 40% higher than that of Ni(OH) 2 (163 m 2 g −1 ). Their specific capacitance is up to 1202 and 1022 F g −1 at the current densities of 10 and 20 A g −1 , respectively. Furthermore, the capacitance retention of the electrode materials at the current density of 10 A g −1 is 98% after 5000 cycles. The synthesis method provides a novel simple route to fabricate heterostructure materials for capacitors with high electrochemical performance. Graphical abstract ᅟ