Mesoporous NiCo2S4 nanoparticles as high-performance electrode materials for supercapacitors

Facile synthesis of CoNi 2 S 4 /Co 9 S 8 composites as advanced electrode materials for supercapacitors

“…As shown in Fig 4a, the nitrogen adsorption-desorption isotherm belongs to Langmuir H4 type isotherm that has an obvious hysteresis loop in the range of 0.6-1 relative pressure, which indicates the mesoporous characteristic of the sample [39]. The BET specific surface area of the sample is calculated to be 57.9 m 2 /g, which is larger than most of the reported values [35,[39][40]42]. The pore size distribution estimated by BJH method mainly distributes in the range of 1~4 nm and centered at 2.5 nm, suggesting its large specific surface area.…”

Is NiCo2S4 Really a Semiconductor?

“…[1][2][3][4][5] Essentially, all reports on this material have presumed it to be semiconducting, like many of the chalcogenides, with a reported band-gap in the range of 1.2-1.7 eV. 6,7 In this report, we have conducted detailed experimental and theoretical studies, most of which done for the first time, which overwhelmingly show that NiCo 2 S 4 is in fact a metal.…”

Self-templating Scheme for the Synthesis of Nanostructured Transition-Metal Chalcogenide Electrodes for Capacitive Energy Storage

“…Our performance is superior to that of all reported ternary nickel cobalt sulfides based materials (literature reports were summarized in Supplementary Table S1). 24,34,38,40,[46][47][48][49][50] This phenomenon may be attributed to the unique double shell structure which offers many desirable features. First of all, the highly porous double shells surfaces are covered with self-assembled nanosheets which are full of mesopores (with size distribution centered around 3-5 nm, Supplemental Figure S7B).…”

“…In addition, the NCS double shell structure offers an impressively high surface area, suggesting the possibility of the exposure of numerous active sites available for reaction on the electrode surface. 40 Moreover, the higher meso/macropore volume of double-shell NCS can boost the electrolyte ions trapping and access to the active sites. In addition, the vertically coated curved nanosheet arrays of the NCS double-shells can increase the contact area between neighboring double-shells (Supplementary Figure S15) and provide a superb pathway for fast electron transportation through the electrodes.…”