One-pot synthesis of porous B-doped NiCo-LDH anchored on Ti3C2 nanosheets for supercapacitor

A facile one-pot strategy synthesizes porous B-NiCo-LDH/Ti 3 C 2 2D/2D heterostructures. • B doping tunes electronic structure and strengthens NiCo-LDH/Ti 3 C 2 interfacial bond. • Composite shows enlarged surface area and optimal porous structure for ion transport. • This work offers a universal strategy for designing doped 2D heterostructures. MXenes and layered double hydroxides (LDHs) emerge as advanced electrode candidates for high-performance supercapacitors. Nevertheless, pure Ti 3 C 2 or LDH suffers from either self-stacking or low electronic conductivity and instability. In this work, porous B-doped NiCo-LDH (B-NiCo-LDH) anchored on Ti 3 C 2 nanosheets has been designed and fabricated via a one-pot co-precipitation reaction. Element doping, composite fabrication and structural regulation are realized simultaneously via a simple one-step synthetic strategy. The obtained 2D/2D B-NiCo-LDH/Ti 3 C 2 heterostructures combine the advantages of LDH, Ti 3 C 2 , element doping and porous structure. Boron incorporation diminishes interfacial binding energy in the B-NiCo-LDH/Ti 3 C 2 system, expedites electron movement across interfaces, and ameliorates the composite’s electrical conductivity. The optimal B-NiCo-LDH/Ti 3 C 2 -20 delivers a specific capacitance of 1581.66 F g −1 at 1.0 A g −1 , a rate capability with 82.73% capacitance retention at 20 A g −1 , and a cycling stability of 77.55% after 5000 cycles. An aqueous battery-type hybrid asymmetric supercapacitor (HASC, B-NiCo-LDH/Ti 3 C 2 -20//Bi 2 O 3 /Ti 3 C 2 ) exhibits an energy density of 87.28 Wh kg −1 at a power density of 753.86 W kg −1 . This work provides a feasible strategy for improving energy storage performance via the design of element-doped 2D heterostructures. Download: Download high-res image (379KB) Download: Download full-size image