Facile Electrodeposition of NiCo 2 O 4 Nanosheets on Porous Carbonized Wood for Wood-Derived Asymmetric Supercapacitors.

Multichannel-porous carbon derived from wood can serve as a conductive substrate for fast charge transfer and ion diffusion, supporting the high-theory capacitance of pseudocapacitive materials. Herein, NiCo 2 O 4 nanosheets, which are hierarchically porous, anchored on the surface of carbonized wood via electrodeposition for free-binder high-performance supercapacitor electrode materials, were proposed. Benefiting from the effectively alleviated NiCo 2 O 4 nanosheets accumulation and sufficient active surface area for redox reaction, a N-doped wood-derived porous carbon-NiCo 2 O 4 nanosheet hybrid material (NCNS-NCW) electrode exhibited a specific electric capacity of 1730 F g -1 at 1 A g -1 in 1 mol L -1 KOH and splendid electrochemical firmness with 80% capacitance retention after cycles. Furthermore, an all-wood-based asymmetric supercapacitor based on NCNS-NCW//NCW was assembled and a high energy density of 56.1 Wh kg -1 at a watt density of 349 W kg -1 was achieved. Due to the great electrochemical performance of NCNS-NCW, we expect it to be used as an electrode material with great promise for energy storage equipment.