Conformal Coating of Cobalt-Nickel Layered Double Hydroxides Nanoflakes on Carbon Fibers for High-performance Electrochemical Energy Storage Supercapacitor Devices

摘要: High specific capacitance coupled with the ease of large scale production is two desirable characteristics a potential pseudo-supercapacitor material. In current study, uniform and conformal coating nickel-cobalt layered double hydroxides (CoNi0.5LDH,) nanoflakes on fibrous carbon (FC) cloth has been achieved through cost-effective scalable chemical precipitation method, followed by simple heat treatment step. The conformally coated CoNi0.5LDH/FC electrode showed 1.5 times greater compared to electrodes prepared conventional non-conformal (drop casting) method depositing CoNi0.5LDH powder microfibers (1938 Fg−1 vs 1292 Fg−1). Further comparison non-conformally rate capability 79%: 43% capacity retention at 50 Ag−1 cycling stability 4.6%: 27.9% loss after 3000 cycles respectively. superior performance mainly due reduced internal resistance fast ionic mobility between as which evidenced EIS CV studies.