Integration of solid-state dye-sensitized solar cell with metal oxide charge storage material into photoelectrochemical capacitor

摘要

A solid-state photo-rechargeable capacitor (photocapacitor) is obtained here by coupling a dye-sensitized solar cell and a ruthenium oxide based electrochemical capacitor. This integrated system permits direct storage of energy generated by sunlight within a single optoelectronic micro-electrochemical device. It utilizes three planar electrodes arranged sequentially to include a polymer hole conductor (poly-(3-hexylthiophene-2,5-diyl)), between the titanium oxide photoanode modified with dye (E)-3-(5-(4-(Bis(20,40-dibutoxybiphenyl-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid (D35) and the intermediate silver electrode as well as two hydrous ruthenium oxide layers (separated by protonically conducting Nafion™ membrane) between the intermediate (silver) and the external (counter) electrode. Upon integration of the capacitor and dye-sensitized solar cell into a single photocapacitor hybrid device, the following parameters were obtained under simulated 100 mW cm ~(-2) solar illumination: specific capacitance, 407 Fg~(-1) (3.26 F cm ~(-2)); energy and power densities, 0.17 mWh cm~(-2) and 0.34 mW cm~(-2) and coulombic efficiency, 88%. These data together with results of experiments performed at different light intensities (10-100 mW cm~(-2)) are consistent with very good performance of the optoelectronic device under various light conditions.