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( Panitat Hasin ),( Vittaya Amornkitbamrung ),( Narong Chanlek ) 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Nanocomposites of cobalt or nickel species and N-doped mesoporous carbon as well as tungsten carbide imbedded in N-doped hierarchical hollow mesoporous carbon were prepared for replacing Pt as the electrocatalysts on the counter electrodes (CEs) of dye-sensitized solar cells (DSCs). It is shown that the obtained nanocomposite carbon materials significantly improve the electrocatalytic activity toward the reduction of I<sub>3</sub><sup>-</sup> compared to bared porous carbons. The prepared nanocomposite carbon materials with enhanced electrochemical stability are the benefit to combining high electrical conductivity and electrocatalytic activity into one material in which Co or Ni species as well as WC serve as the electrocatalysts and N-doped mesoporous carbon as well as N-doped hierarchical hollow mesoporous carbon serves as the electrical conductors. The fabricated nanocomposite carbon materials based DSCs show the best light-to-electricity conversion efficiency (η) which are higher than those of the cells with bared porous carbons CEs and are comparable to that of the cell with a platinized CE.
Aunping Namfon,Kumlangwan Pantiwa,Towannang Madsakorn,Chanlek Narong,Kumnorkaew Pisist,Klangtakai Pawinee,Srepusharawoot Pornjuk,Thongnum Anusit,Chompoosor Apiwat,Jarernboon Wirat,Pimanpang Samuk,Rutt 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.8
CH3NH3PbI3 (MAPbI3) flm was prepared by a convective method, and its X-ray difraction spectrum displays the tetragonal perovskite structure. GeI2 and GeBr2 powders dissolve poorly in a mixed dimethylformamide-dimethylsulfoxide (DMFDMSO) solvent, but the introduction of 5 wt% 5-ammonium valeric acid iodide (5-AVAI) into the mixed DMF-DMSO solvent greatly promotes GeI2 and GeBr2 solubility. XRD spectra of the (5-AVAI)MAPbI3, MAGexPb1–xI3, and MAGexPb1–xBr2xI3–2x (x=0.0625 and 0.125) flms exhibit a tetragonal perovskite structure, but the flm morphologies become rougher than that of the pristine MAPbI3 flm. Discontinuous islands are formed on MAGexPb1–xI3 and MAGexPb1–xBr2xI3–2x (x=0.125) flms. X-ray photoemission spectroscopy (XPS) analysis detected the Ge element on all Ge-doped flms. The best performance levels of the carbon-based hole transport layer-free MAGexPb1–xI3–x (x=0.0625, η=3.63%) and MAGexPb1–xBr2xI3–2x (x=0.0625, η=2.95%) perovskite solar cells are lower than that of the pristine MAPbI3–based perovskite solar cell (η=5.28%). This is likely due to the increased surface roughness, pin-holes, isolated islands, and the decreased light absorbance of the Ge-doped flms in comparison with the pristine MAPbI3 flm.