| 초록 |
Cellulose of various forms possess high strength, aspect ratio and low density with a three-dimensional open network structure, making them ideal candidate for current collectors in energy application. Herein, a cellulose based bamboo fiber with unique and naturally convoluted morphology is adopted as catalytically active cobalt substrates for water splitting. For efficient evolution of hydrogen and oxygen, cobalt-based bimetallic alloys, namely, cobalt-molybdenum and cobalt-iron, are electrodeposited. The electrodes possesses a highly macro-porous network of hexa-filament micro-fibrils that show exceptional catalytic activities. In quantitative terms, anodic and cathodic current density of 50 and -10 mA cm-2 at respective overpotentials (η) of 250 and 46 mV with low activation energy (Ea = 28 kJ mol-1) are achieved. When operated under industrial standards of 5 M KOH @ 343 K, they demonstrate excellent water electrolyzing activities (η-100(HER) = 147 mV; η100(OER) = 209 mV). This work promises a new strategy in designing highly efficient electrodes that economic as it was obtained from an ubiquitous eco-friendly material for energy conversion. |
