Ni-soc-MOF derived carbon hollow sphere encapsulated Ni₃Se₄ nanocrystals for high-rate supercapacitors

Abstract

Carbon hollow sphere encapsulated Ni3Se4 (Ni3Se4@CHS) nanocrystals are converted from Ni-soc-MOF by pyrolysis and further selenization. Ni3Se4@CHS exhibits capacitance of 1720 F g-1 at 1 A g-1 and capacitance retention...

Multifunctional metal selenide-based materials synthesized via a one-pot solvothermal approach for electrochemical energy storage and conversion applications

“…4(g)). The obtained areal capacities were about 454, 438.6, 419.2, 407, 380.7, 344.3, 334.1, 319.4, 290.7, and 269.7 µA h cm −2 at current densities of 3,5,7,10,15,20,25,30,40, and 50 mA cm −2 , respectively. After the current density had been ramped up, when the current density returned to 3 mA cm −2 , the obtained areal capacity was ∼454 µA h cm −2 .…”

“…Some metals, such as nickel (Ni), are able to achieve desirable conductivity. 25 Additionally, the grouping of various transition metals in the arrangement of binary and ternary metals can afford good electrical conductivity. Dual iron–nickel selenide (FeNiSe) materials are considered an adaptable path for combining new functions, such as electrochemical performance and electronic arrangement, in synergetic combination as active materials for SCs/OER/HER with improved redox reactions, easy assembly, and environmental friendliness.…”

Spatially confined magnesiothermic reduction induced uniform mesoporous hollow silicon carbide nanospheres for high-performance supercapacitors

“…3e), which could be attributed to the delicate structural combination of internally interconnected hollow void/openly accessible mesoporous shell (B25 nm thickness) supply channels for fast and unimpeded transport of ions. 17,21 After more than 12,000 cycles, the capacitance retention rates in KOH and EMIMBF 4 are B95% and 90%, respectively, at 5 A g À1 , as shown in Fig. 3f.…”