“…In recent years, many studies have been conducted on cobalt sulfides, especially Co 9 S 8 , as a series of promising oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) electrocatalysts owing to their low cost, eco-friendliness, and comparable catalytic activity compared with precious-metal-based catalysts. 1–12 Nevertheless, the electrocatalytic activity of Co 9 S 8 cannot be fully utilized because of its poor electrical conductivity. 13,14 On that account, the highly conductive carbon supports have been combined with Co 9 S 8 to form a hybrid, which improved its electrical conductivity effectively.…”