Hollow NiCo2Se4 microspheres composed of nanoparticles as multifunctional electrocatalysts for unassisted artificial photosynthesis

NiCo2Se4 Hierarchical Microflowers of Nanosheets and Nanorods as Pseudocapacitive Mg-Storage Materials

“…02-1074) without other crystalline phases. Upon selenylation to form NCS-S and NCS-R, distinctly different XRD patterns are observed, which are in accordance with reported results and indicate high purity of NiCo 2 Se 4 samples. − As illustrated by the crystal structure (Figure a inset), NCS has a defect monoclinic layered structure with vacancies in each Ni layer . Previous studies have shown that A x B 3– x X 4 (A, B = Fe, Co, Ni, ...; X = S, Se, Te) displays metallic behavior, suggesting the high conductivity and good electrochemical performance of NiCo 2 Se 4 …”

“…NiCo 2 Se 4 , as a ternary Ni/Co selenide, has been reported to be applied to supercapacitors and electrocatalysis. − For instance, Miao et al used NiCo 2 Se 4 nanosheets to improve the performance of flexible threadlike supercapacitors, which exhibits 5.18 mW h cm –3 high volume energy density . Hollow NiCo 2 Se 4 microspheres could also be employed for highly efficient water splitting . Herein, NiCo 2 Se 4 is employed as a pseudocapacitive Mg-storage material because of its excellent electrochemical activity, unique conductivity, and ultrahigh capacitance .…”

“…29 Hollow NiCo 2 Se 4 microspheres could also be employed for highly efficient water splitting. 30 Herein, NiCo 2 Se 4 is employed as a pseudocapacitive Mg-storage material because of its excellent electrochemical activity, unique conductivity, and ultrahigh capacitance. 28 Moreover, the Mg-storage reaction reversibility could be improved by the "softness" of the Se 2− anion because the interaction with Mg 2+ (hard acid) could be largely depressed in light of hard and soft acids and bases (HSAB) principle.…”

Quaternary Iron Nickel Cobalt Selenide as an Efficient Electrocatalyst for Both Quasi‐Solid‐State Dye‐Sensitized Solar Cells and Water Splitting

“…prepared cobalt‐doped FeSe 2 ‐RGO as a highly active electrocatalyst for HER in acidic solutions . We have reported that ternary NiCo 2 Se 4 shows high electrochemical activity in both DSSCs and water‐splitting cells . Based on previous studies, the addition of another, cheaper, element (e.g., Fe) into the crystal structure of ternary selenides may result in an improvement in conductivity, which may be beneficial for achieving better electrocatalytic performance .…”

“…We have reported that ternary NiCo 2 Se 4 shows high electrochemical activity in both DSSCs and water‐splitting cells . Based on previous studies, the addition of another, cheaper, element (e.g., Fe) into the crystal structure of ternary selenides may result in an improvement in conductivity, which may be beneficial for achieving better electrocatalytic performance . Therefore, it is interesting to synthesize quaternary metal selenides as electrocatalysts for DSSCs, HER, OER, and water splitting.…”