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MOF Derived Co,N Codoped Carbon/Ti Mesh Counter Electrode for High Efficiency Quantum Dot Sensitized Solar Cells.

Carbon supported on titanium mesh electrodes have been recognized as the best performing counter electrodes (CEs) in quantum-dot sensitized solar cells (QDSCs). Herein, layered double hydroxides (LDHs) are applied as scaffold template for the growth of cobalt-zeolite-imidazole framework (ZIF-67) crystals, and micrometer sized Co, N co-doped porous carbon materials (Co,N-C) are obtained through a carbonization process. The as-prepared Co,N-C exhibits favorable features for electrocatalytic reduction of polysulfide, including a high surface area of 491.36 m2/g, highly effective active sites, and a hierarchical micro/mesoporous structure. Due to the large particle size, the obtained Co,N-C can couple with Ti mesh substrate for the fabrication of high performance Co,N-C/Ti CEs for QDSCs. As a result, the corresponding QDSCs exhibit an average efficiency of 13.55% (Jsc = 25.93 mA/cm2, Voc = 0.778 V, FF = 0.672), which is a 10.5% enhancement compared to the previous best result from N-doped mesoporous carbon counterpart.