One-pot synthesis of CoxSy nanomaterials for high-performance supercapacitors

Recovery of cobalt as CoS from spent Li-ion batteries and investigation of its use as an electrode material for supercapacitors

“…The specific surface area is close to the value (11.7 m 2 g À1 and 12.7 m 2 g À1 ) found for cobalt sulfide in the literature. 32,48 Higher pore sizes provide better ion transformations for mobile ions from the solution to the electrode surface in supercapacitor applications. [49][50][51] The SEM images and elemental mapping of the ground cobalt sulfide powder are shown in Fig.…”

“…As a result, they demonstrate good electrochemical performance in electrochemical supercapacitor applications by displaying strong pseudo-capacitive characteristics. 32 Cobalt sulfides are a significant group of transition metal chalcogenides, which are present in a variety of transition metal compounds. 33 The CoS-type cobalt sulfides display increased capacitive performance because they allow for cobalt oxidation and reduction.…”

“…33 The CoS-type cobalt sulfides display increased capacitive performance because they allow for cobalt oxidation and reduction. 32 Cobalt sulfide exists in a variety of phases and forms with different chemical formulations such as CoS, CoS 2 , Co 3 S 4 , and Co 9 S 8 . [34][35][36][37] These phases mainly rely on the precursors used as starting materials and how temperature affects the reaction.…”

“…38 On the other hand, Shen et al investigated the super capacitive feature of CoS in the same electrochemical system and the highest capacitance value reached was 347.4 F g −1 at 0.5 A g −1 . 32 Kumar et al produced an asymmetric-type supercapacitor device with CoS. They used 80% CoS by weight, 15% acetylene black, 5% polyvinylidene fluoride (PVDF), and N -methyl-2-pyrrolidone (NMP) as a binding solvent on the positive electrode.…”

Electrochemical Supercapacitor Application of Electrochemically Produced Chlorine-Doped Graphene Oxide with Cobalt Sulfide-Based Compounds Produced from Recycling of Spent Li-Ion Batteries

“…11,[17][18][19][20] Transition metals have a variety of valence states due to the presence of many easily lost single electrons. 21 Consequently, they demonstrate significant pseudo-capacitive properties and deliver superior electrochemical performance when utilized in electrochemical supercapacitor applications. 11,21 Cobalt sulfides, which are a substantive family of transition metal chalcogenides, 22 have several chemical formulas and forms, including CoS, CoS 2 , Co 3 S 4 , and Co 9 S 8 .…”