Solvent and Metal‐Ligand Co‐Assisted Synthesis of Self‐Supporting Ni‐Co‐Mo‐S Cross‐Linked Nanostructures for Supercapacitors

Abstract

AbstractConstruction of prosperous morphology and incorporation of multiple metals with synergistic effect can effectively enhance the electrochemical performance of electrode materials. Herein, transition metal (Ni, Co, Mo) sulfides (NCM‐DI, NCM‐DI‐NTA, NCM‐EG, NCM‐EG‐NTA, NCM‐Mix‐NTA) were synthesized, and the morphology was adjusted by incorporating metal ligand and altering the solvent atmosphere. The addition of ligand nitrilotriacetic acid (NTA) endowed the formation of cross‐linked network (NCM‐DI‐NTA, NCM‐EG‐NTA, NCM‐Mix‐NTA), and the as‐prepared materials generated in mixed solvent (NCM‐Mix‐NTA) displayed smaller size. Materials with NTA added (NCM‐DI‐NTA, NCM‐EG‐NTA, NCM‐Mix‐NTA) displayed higher specific capacity (754, 943 and 1206 F g−1, respectively), which is much higher than NCM‐EG (909 F g−1) and NCM‐DI (331 F g−1). After doped with rGO, the materials (NCM‐Mix‐NTA‐rGO) exhibited a specific capacity of 1984 F g−1 at 1 A g−1. When assembled into asymmetric supercapacitors, it delivered the energy density of 61.6 Wh kg−1 at a power density of 901.4 W kg−1, and maintained the 86.5 % of their initial capacity even after 5000 cycles.