Electrochemical energy storage of Co powders in alkaline electrolyte

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

“…The results may be due to the formation of high concentration Co(OH) 2 on the electrode during the electrochemical reactions in KOH alkali solution 18 . Similar results have been reported in the previous literatures 16‐18,46 . Moreover, as shown in Figure 10B, C, some cracks appeared on the surface of Co 9 S 8 sample.…”

“…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.…”

“…Too much CoRGO may cause the separation of active materials from the alloy surface, affect the electrochemical reactions at the electrode/electrolyte interface and reduce the content of Co 9 S 8 alloy in the electrodes, thus decreasing the electrochemical activities and capacities of the electrodes. 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. In this study, the cycle stabilities for composites were significantly enhanced after adding RGO and CoRGO as expected.…”

The Co-B Amorphous Alloy: A High Capacity Anode Material for an Alkaline Rechargeable Battery

“…In fact, the electrochemical reaction is based on the multi-electron redox reaction [12]. For instance, Co-based alloys as anodes in alkaline secondary batteries are primarily ascribed to the redox between Co and Co(OH) 2 [13][14][15][16][17][18][19]. Wang et al first reported that the Co-B alloy prepared via a chemical reduction method in an aqueous solution from bivalent cobalt sulfate has a reversible discharge capacity exceeding 300 mAh/g at 100 mA/g in an aqueous KOH solution [9], very close to those of conventional hydrogen storage alloys.…”

Development of the electrochemical synthesis method of ultrafine cobalt powder for a superalloy production

“…Cobalt powder possesses high electrical conductivity, electrochemical and catalytic properties and is used for various purposes. For instance, it is used in chemical power sources [1], including hydrogenation [2] or as anodic material [3].…”