We synthesized a low-cost, highly catalytic tungsten carbide that was embedded in ordered mesoporous carbon (WC-OMC). This was used as a counter electrode (CE) in dye-sensitized solar cells (DSCs). For comparison, we also evaluated the catalytic activity of bare WC, and several normal carbon materials for the organic redox couple of thiolate/disulfide (T−/T2). The DSCs showed highly photovoltaic conversion efficiencies, ranging from 4.75% to 5.34%. The efficiency of the DSC composed of WC-OMC was 45% higher than that of Pt. Based on kinetic studies, the increased efficiency was caused by the increased exchange current density and decreased charge transfer resistance.
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Wang et al. (2011) studied this question.
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