Hierarchical Ni 3.5 Co 5.5 S 8 nanosheet-assembled hollow nanocages: Superior electrocatalyst towards oxygen evolution reaction

Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion

“…By employing MnCo 2 S 4 as the positive electrode and rGO as the negative electrode, an asymmetric HSC was assembled. The specific capacitances of the asymmetric HSC were 88,66,60,49,40,24, and 20 F g −1 at current rates of 1, 2, 3, 4, 5, 8, and 12 A g −1 , respectively. Additionally, the asymmetric HSC device displayed a high energy density of 31.3 W h kg −1 at a power density of 800 W kg −1 .…”

“…Up to present, numerous intriguing templates have been developed, including mixed metal oxide, [72,73] mixed metal hydroxide, [74,75] layered double hydroxide (LDH), [76,77] mixed metal carbonate, [78,79] mixed metal glycerate, [28,80,81] mixed metal carbonate hydroxide, [27,82] mixed metal acetate hydroxide, [83] mixed metal silicate, [84,85] and metal-organic frameworks (MOFs). [86][87][88] These self-engaged templates could directly determine the shape, size, and composition of the resultant MMSs. Especially, the self-template method is an efficient approach to generate MMSs with hollow nanostructures.…”

“…Ternary nickel cobalt sulfides with various crystal structures (such as NiCo 2 S 4 , [27,33,74,103,108,121] CoNi 2 S 4 , [93,98,111,117] Ni 1.5 Co 1.5 S 4 , [122] Co 0.9 Ni 0.1 S 2 , [123] Ni 3.5 Co 3.5 S 8 , [88] and Ni 3 Co 6 S 8 [124] ) and diverse nanostructures (such as nanoparticles, [92][93][94][95][96] nanotubes, [99] nanosheets, [100] and hierarchical porous/hollow nanostructures [28,74,75,79,83,99,[103][104][105][125][126][127][128] ) have been widely investigated and proved to possess superior electrochemical performance for energy storage and conversion. In this section, the application of nanostructured ternary nickel cobalt sulfides in HSCs, LIBs/SIBs, and electrocatalysis will be thoroughly summarized and discussed.…”

“…In this context, various nanostructured nickel cobalt sulfides and their hybrids with carbon materials have been assessed for electrocatalysis. [31][32][33]88,123,[230][231][232][233][234][235][236][237][238][239] As a typical thiospinel, NiCo 2 S 4 with the conventional spinel structure possesses more octahedral electrocatalytically active sites of Co(III) cations as compared to NiCo 2 O 4 , holding potentially good bifunctional catalytic activity for both ORR and OER. [230] The bifunctional electrocatalytic properties of NiCo 2 S 4 for oxygen were first evaluated by Liu et al [33] NiCo 2 S 4 nanoparticles were loaded on nitrogen and sulfur co-doped rGO nanosheets (NiCo 2 S 4 @N/S-rGO) by a one-pot solvothermal route.…”

Controlled phase evolution from Cu0.33Co0.67S2 to Cu3Co6S8 hexagonal nanosheets as oxygen evolution reaction catalysts

“…9,10 Among various OER catalysts, cobalt based suldes have been widely investigated for the high catalytic activity and low cost. [11][12][13][14][15] Moreover, the structure diversity of cobalt based suldes offers more option for improving OER performance. With the aid of electrodeposition, Co-S with amorphous structure and nanosheet morphology was synthesized, exhibiting an overpotential of 361 mV at 10 mA cm À2 for the OER in 1.0 M KOH.…”