High-performance hybrid supercapacitors based on electrodeposited amorphous bimetallic nickel cobalt phosphide nanosheets

Self -templated construction of hollow trimetallic MnNiCoP yolk–shell spheres assembled with nanosheets as a satisfactory positive electrode material for hybrid supercapacitors

“…21 As illustrated in prior reports, Krishnan and co-authors reported that Ni 0.5 Co 0.5 P displayed a capacity of 42.2 mA h g −1 at 1 Ag −1 , which was better than that of NiP (38.8 mA h g −1 ) and CoP (21.5 mA h g −1 ). 22 Another tactic is to design and synthesize TMPs electroactive materials with a unique architecture. The TMP electroactive materials, with the benefit of their sufficient surface area and firm structure, demonstrate improved oxidation–reduction kinetics and supercapacitive features.…”

Towards High-Performance Supercapacitor Electrodes via Achieving 3D Cross-Network and Favorable Surface Chemistry

“…Energy density (E) and power density (P), two key indicators for the practical application of an asymmetric device, can be studied in Ragone plots (Figure f). To our delight, our device achieves a high-energy density of 48.5 Wh kg –1 at 737.1 W kg –1 and remains as high as 25 Wh kg –1 at 7500 W kg –1 , outperforming previously reported Ni–Co–P-based systems, ,,,− including the Ni–Co–P heterostructure (30.2 Wh kg –1 at 891.0 W kg –1 ), Zn–Ni–Co–P (37.6 Wh kg –1 at 856.5 W kg –1 ), NiCoP/NPC (26.8 Wh kg –1 at 7973 W kg –1 ), NiCoP/LDO-CNT (21.3 Wh kg –1 at 748.5 W kg –1 ), Ni 0.5 Co 0.5 P (45.2 Wh kg –1 at 800 W kg –1 ), NiCoP nanocubes (41.3 Wh kg –1 at 373.3 W kg –1 ), CoP@NiCoP (37.2 Wh kg –1 at 875 W kg –1 ), and NiCoP@CoS (35.8 Wh kg –1 at 748.9 W kg –1 ). Furthermore, for a practical device, the energy efficiency at a current density should be described.…”

Preparation of the Amorphous NiCoP Nanosheet Array on Carbon Cloth for High‐Performance Solid‐State Hybrid Supercapacitor

“…Additionally, the high structural disorder of the amorphous phase provides greater strength and elasticity, which can effectively reduce the structural damage resulting from reiterative volume fluctuations during the charging and discharging cycle. [24,25] Furthermore, the transformation from the amorphous to crystalline phase also leads to the collapse of the carefully designed morphology of the precursor, hindering the rapid transport of electrolyte ions in the electrode material and resulting in a decline in the electrochemical performance of synthesized TMPs. To address these issues, we designed a special quartz reactor with a back room and a semi-closed front room, as shown in Figure 1.…”

“…In contrast to crystalline TMPs, amorphous TMPs consistently exhibit superior capacitive performance, including higher charge storage capacity due to inherent structural defects that provide more active sites for redox reactions, and improved cycle stability resulting from the high structural elasticity generated by the high structural disorder. [24,25] This elasticity effectively mitigates structural fracture caused by the repetitive volume expansion/shrinkage during the charging/discharging cycle. Furthermore, increased crystallinity often leads to structural collapse in the resulting TMPs, making it difficult to maintain the regular morphology of the precursors.…”