Hierarchically designed 3D Cu3N@Ni3N porous nanorod arrays: An efficient and robust electrode for high-energy solid-state hybrid supercapacitors

Engineering heterostructured nickel–cobalt sulfide@hydroxide nanoarrays with spontaneous and fast interfacial charge transfer for high-energy-density supercapacitors

“…Our device shows the highest areal energy density of 880 μW h cm −2 (108.8 W h kg −1 ) at a power density of 1.5 mW cm −2 while still achieving 350 μW h cm −2 (59 W h kg −1 ) at 14.8 mW cm −2 . Impressively, this energy density exceeds the values reported in a lot of previous works, 19,23,47,50,54–56 such as NiCo@Ni–Co LDH//AC (298.6 μW h cm −2 ), 54 Cu 3 N@Ni 3 N//AC (287.2 μ W h cm −2 ), 55 Co 3 O 4 @Ni–Co LDH//AC (275.5 μW h cm −2 ), 49 etc. This result can be attributed to the following advantages of the designed NCS@NC LDH: (i) the porous and wrinkled Ni–Co LDH nanosheet shell and open array structure are beneficial for ion diffusion; (ii) the heterogeneous interface formed by Ni–Co LDH and NiCo 2 S 4 can induce spontaneous and rapid charge transfer from the shell to the core, while improving the adsorption ability of OH − ; (iii) both Ni–Co LDH nanosheets and NiCo 2 S 4 nanotubes can contribute a large capacity; (iv) the electrode has high mass loading, resulting in an enhancement of areal specific capacitance.…”

“…Impressively, this energy density exceeds a lot of reported work, 19,23,47,50,[54][55] such as NiCo@Ni-Co LDH//AC (298.6 μWh cm -2 ), 54 Cu 3 N@Ni 3 N//AC (287.2 μWh cm -2 ), 55 Co 3 O 4 @Ni-Co LDH//AC (275.5 μWh cm -2 ), 49 etc. This result can be attributed to the 2 at 1 mA cm -2 ) and superior cycling stability (91.5% retention after 5000 cycles).…”

Hierarchical Structure of CuO Nanowires Decorated with Ni(OH)2 Supported on Cu Foam for Hydrogen Production via Urea Electrocatalysis

“…[ 11f,23a,24 ] Specifically, the commercial CF with a 3D network serves as both the conductive substrate and Cu source for the growth of vertically oriented Cu(OH) 2 NWs through the reported chemical oxidation process (for more details on the synthesis process, please refer to the “Experimental Section” in the Supporting Information). [ 11f,23a,25 ] Cu(OH) 2 NWs/CF was then calcined in air (180 °C for 1 h) to obtain CuO NWs/CF. Electrodeposition has been demonstrated as a facile and effective method to deposit 2D materials on substrates.…”

“…Electrodeposition has been demonstrated as a facile and effective method to deposit 2D materials on substrates. [ 9d,11f,13c,23a,24–26 ] Finally, ultrathin Ni(OH) 2 nanosheets were electrodeposited on the surface of the CuO NWs/CF in a Ni(NO 3 ) 2 aqueous solution, giving rise to the generation of a self‐supported electrode containing CF‐supported hierarchical Ni(OH) 2 /CuO NWs’ nanostructure (denoted as Ni(OH) 2 /CuO NWs/CF) (Figure 2a).…”

Syntheses and electronic structure engineering of transition metal nitrides for supercapacitor applications

“…Besides, Jun et al 99 reported a Cu 3 N@Ni 3 N nanorod array integrated on copper foam with Cu 3 N@Ni 3 N serving as the numerous active sites and showing the synergistic effect in the supercapacitor. A freestanding 3D Cu 3 N@Ni 3 N core-shell structure developed by the nitration of Cu(OH) 2 @Ni(OH) 2 supported on CF.…”