Facile Synthesis of Binary Transition Metal Sulfide Tubes Derived from NiCo‐MOF‐74 for High‐Performance Supercapacitors

Abstract

Recently, binary transition metal oxides, phosphates, and sulfides have attracted wide attention due to their potential applications in supercapacitors. The emergence of metal‐organic frameworks (MOFs) provides new opportunities for the synthesis and investigation of porous binary metal compounds with similar microstructures. Herein, binary metal oxide (NiCo‐O) tubular structures are derived from NiCo‐MOF‐74 via a facile annealing process, and then phosphate (NiCo‐P) and sulfide (NiCo‐S) structures are obtained from NiCo‐O by heat treatment and solvothermal process, respectively. Among the three derivatives, NiCo‐S with nanosheet structures has the highest specific capacitance of 930.4 F g−1 at a current density of 1 A g−1 and an excellent rate capability with a retention of ≈80% at 10 A g−1. The long‐term cycling performance of NiCo‐S is superior with 70.5% retention after 10 000 cycles. The hybrid supercapacitor device with NiCo‐S and activated carbon as positive and negative electrodes delivers a high energy density of 22.6 W h kg−1 at a power density of 800 W kg−1. The excellent performance of NiCo‐S can be attributed to its nanosheet structure, which increases the specific surface area and electroactive sites.

Effect of NiO on organic framework functionalized ZnO nanoparticles for energy storage application

“…The organic framework‐based strategy to synthesize ZnO@NiO nanomaterial ( Figure ) was developed by modifying reported methodologies particularly relating to metal‐organic frameworks (MOFs) . The organic compounds were extracted by treating 2 g of dried powdered leaves of E. cognate with deionized water on vigorous stirring for 30 min at 60°C.…”

“…To fabricate electrode, the slurry of thermally annealed ZnO@NiO nanomaterial, acetylene black, and polyvinylidene (PVDF) was prepared in 8:1:1 in organic solvent of N‐methyl pyrrolidinone following reported methodologies . They as prepared slurry was then consistently pasted onto the porous Ni foam which was then treated at 60°C for 10 h under vacuum (Figure ).…”

Organic template-assisted green synthesis of CoMoO4 nanomaterials for the investigation of energy storage properties

“…6,9,[15][16][17][18] Therefore, in order to achieve high SC performance, an efficient way is to develop electrode materials with tailored and enhanced morphology. 19,20 Over recent years, transition metal oxides have been widely investigated as electrode materials. 3,6,[9][10][11][12][13][14][15][16][17][18] The notable advantages of using metal oxides as electrode materials are earth abundance, high theoretical capacity, economical use and ability to be modied in different morphologies and structures.…”

“…[10][11][12][13][14] Nevertheless, the synthesis of metal oxide nanomaterials with modied surface chemistry has certain limitations such as high cost, large-scale production, sophisticated techniques and complicated synthesis procedures. 1,6,7,9,20 Thus, the sustainable synthesis of metal oxide nanomaterials with effective functional groups is still a great challenge in the 21 st century. 45,48,51,54,59 In this regard, herein, we developed a sustainable synthesis route to synthesize metal oxide nanostructures (CoMoO 4 ) via an inorganic-organic framework.…”

Nitridation Temperature Effect on Carbon Vanadium Oxynitrides for a Symmetric Supercapacitor

“…Thus, it is necessary to synthesize new electrode materials applicable in Faradaic capacitors. Recently, several achievements geared at improving the stability, conductivity and wettability of Faradaic materials have been reported such as the adoption of metal sulphides (MSs) [12], metal nitrides (MNs) [13] and metal oxynitride (MONs) [14]. For MNs, the oxygen (O 2− ) atoms in the metal octahedral position were completely replaced by nitrogen (N 3− ) atoms, while for the MONs (e.g., M = Ti [15], W [16], Mo [17], V [18]), the replacement is partial which leads to the presence of some metal oxides [14].…”