In situfabricated photo-electro-catalytic hybrid cathode for light-assisted lithium-CO(2)batteries

摘要

Severe polarization triggered by the limited electrochemical activity of carbon dioxide as well as the insulating and insoluble discharge product Li(2)CO(3)significantly impedes the practical application of Li-CO(2)batteries. Herein, a light-assisted Li-CO(2)system employing SiC/RGO as the photo-electro-catalytic hybrid cathode is presented to overcome the obstacle of polarization in conventional Li-CO(2)cells. RGO is capable of transferring high-energy electrons generated on SiC after absorbing photons, inhibiting the recombination of photogenerated electrons. During the discharge process, the kinetics of CO(2)reduction reaction is promoted by the photogenerated electrons. Thus, the discharge voltage of the battery is increased to 2.77 V, which is very close to the theoretical potential for 4Li + 3CO(2)-> 2Li(2)CO(3)+ C (2.80 V). Besides, the holes generated on the photoelectrode upon charging promote the decomposition of Li2CO3, effectively alleviating the overpotential of the Li-CO(2)battery. Consequently, the system exhibits an excellent energy efficiency of 84.4%. These findings demonstrate the promising potential of the photo-assisted electrochemical process in addressing the overpotential issue of Li-CO(2)batteries.