|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XV
||A Significant Improvement in the Electrocatalytic Stability of N-doped Graphene Nanosheets used as a Counter Electrode for Iodide/triiodide based Dye-sensitized solar cells and [Co(bpy)3]3+/2+ based Porphyrin-sensitized Solar Cells
||Zhai Peng, Feng Shien-Ping
|On-Site Speaker (Planned)
To further meet the needs of low cost and wide applications, high electrocatalytic and wettable nitrogen-doped graphene (NG) nanosheets are used as Pt-free CE for dye-sensitized solar cells (DSSCs) and porphyrin (YD2-o-C8) based dye-sensitized solar cells (PSSCs), which are coupled with iodide/triiodide and Co(polypyridyl) redox electrolyte, respectively. A low cost solution-based process has been developed by using cyanamide (NH2CN) at room temperature and normal pressure. The pyrrolic and pyridinic N atoms are doped into the carbon conjugated lattice to enhance electrocatalytic activity. NG film having N-doping active sites and large porosity provides a wettable surface to facilitate electrolyte diffusion so that improves fill factor and efficiency. In addition, The NG CE exhibits a lower value of charge transfer resistance (Rct) for the Co(polypyridyl) redox couple and significantly better electrochemical stability (>1000 times) during prolonged potential cycles than those for the Pt CE.
||Planned: A print-only volume