Comparison of Co–S electrodes synthesized via different methods for alkaline rechargeable batteries

Preparation and electrochemical hydrogen storage properties of Co 9 S 8 alloy coated with cobalt/graphene composite

“…It is commonly believed that the pulverization and oxidation/corrosion of alloy lead to the gradual deactivation of alloy electrode. The dissolution of cobalt hydroxide intermediate products in the alkaline solution cause the decrease of capacity retention rate 17,46 . The more alloy surfaces exposed in the electrolyte may lead to more serious dissolution of the active substance, thus decreasing the cycle stability of the alloy electrode.…”

“…Table 3 summarizes the properties of different Co‐S materials in the previous reports. Simple mixing, hydrothermal method, arc‐melting and ball‐milling methods were applied to prepare Co‐S hydrogen storage materials 16‐18,47 . Co‐S alloys with different component, structure and morphology were also synthesized 48 .…”

“…Co-S 16,17 373 reaction kinetics, I 0 was calculated via measuring the current at different overpotentials and the numerical results were summarized in Table 4. After the addition of 6% RGO and 6% CoRGO, the I 0 value increased from 169.4 mA/g to 237.5 mA/g and 263.2 mA/g, respectively, which coincided with the HRD results.…”

“…A discharge capacity of 350 mAh/g was obtained for the Co‐S alloy in the first cycle, and the capacity remained above 86% after 100 cycles 16 . The high‐energy ball‐milling was proved an effective preparation method to obtain pure phase Co‐S compound with superior cycle stability and hydrogen storage capacity 17 . Pure CoS 2 and Co 9 S 8 powders were fabricated with specific mole ratio of raw materials, ball‐milling time and speed 18 .…”

High energy ball-milling preparation of Co–B amorphous alloy with high electrochemical hydrogen storage ability

“…In recent years, a series of Co-metalloid amorphous or nanocrystalline alloys, such as Co-B [3,4], Co-P [5][6][7], Co-S [8][9][10], Co-Si [11][12][13], Co-BH [14], Co-Si 3 N 4 [15] and Co-La 2 Mg 17 [16], have been prepared and used as the electrochemical hydrogen storage materials, which displayed large discharge capacity. Much progress has been made since the Co-B amorphous alloy (discharge capacity, $250 mAh/ g) was produced by borohydride reduction process in aqueous CoSO 4 solution [17,18].…”