Engineering oxygen vacancies in tellurium-doped cobalt nickel boride/carbon nanotube composites for high-performance supercapacitor applications
Journal
Journal of Energy Storage
Journal Volume
142
Start Page
119555
ISSN
2352152X
Date Issued
2026-01-10
Author(s)
Abstract
Transition metal borides (TMBs) have emerged as promising candidates for high-performance supercapacitor (SC) electrodes, due to their abundant redox-active sites and high theoretical capacitances. However, their practical application is often constrained by limited stability and particle agglomeration. Herein, a facile chemical reduction strategy is employed to synthesize tellurium-doped cobalt‑nickel boride/carbon nanotube (CoNiB_Te/CNT) nanocomposites with tunable Te contents. The introduction of Te heteroatoms and incorporation of CNTs synergistically enhance the redox activity, electrical conductivity, and structural robustness of the composite. The optimized composite electrode (CoNiB_Te1.25/CNT) achieves an outstanding specific capacity of 1514.6 C g−1 (3029.2 F g−1) at 1 A g−1 and maintains 87.2% capacity retention at 20 A g−1, outperforming the undoped CoNiB and other control samples. The enhanced performance is attributed to the formation of abundant electroactive sites and efficient electron/ion transport pathways. The assembly of the hybrid SC was carried out with CoNiB_Te1.25/CNT (CoNiB_Te1.25/CNT//AC) to deliver a remarkable energy density of 74.0 W h kg−1 at 799.8 W kg−1, and superior cycling stability with 88.4% capacitance retention over 10,000 cycles. This work highlights the critical role of Te doping and carbon nanotubes integration in advancing the practical viability of transition metal boride-based SCs for next-generation energy storage.
Subjects
Battery-type material
Carbon nanotubes
Cobalt nickel boride
Hybrid supercapacitor
Nanocomposites
Tellurium doping
Transition metal boride
Publisher
Elsevier Ltd
Type
journal article