氨(NH_(3))是一种无碳氢载体,比氢更易储运,且体积能量密度更高,因此直接氨燃料电池(DAFC)的研究具有重要的理论意义和实际价值.本工作研究PtIr/C阳极催化剂在不同工作温度下电催化活性及其对DAFC性能的影响,并探究了所用阴离子交换膜...氨(NH_(3))是一种无碳氢载体,比氢更易储运,且体积能量密度更高,因此直接氨燃料电池(DAFC)的研究具有重要的理论意义和实际价值.本工作研究PtIr/C阳极催化剂在不同工作温度下电催化活性及其对DAFC性能的影响,并探究了所用阴离子交换膜的渗氨量与DAFC性能的相关性.结果表明,从25~80℃,基于PtIr/C阳极催化剂的DAFC在80℃下获得最优性能,其开路电压(OCV) 0.50 V,峰值功率密度3.2 m W·cm^(-2),可归功于Pt-Ir合金的协同作用和升温提高了催化活性.不同温度下在DAFC阴极尾气中均检测到氨,且氨含量随温度升高而上升,致使阴极Pt/C催化剂毒化,从而使DAFC的开路电压和功率密度下降.展开更多
The average photoelectric conversion efficiency(PCE)of a bare mono crystalline silicon solar cell is 14.71%±0.03%under AM1.5.It decreases to 14.20%±0.005%when covering an un-doped flat glass on the solar cel...The average photoelectric conversion efficiency(PCE)of a bare mono crystalline silicon solar cell is 14.71%±0.03%under AM1.5.It decreases to 14.20%±0.005%when covering an un-doped flat glass on the solar cell,and it goes down to 14.10%±0.005%by using a 5 wt%Eu^3+doped glass.The absorptions of the Eu^3+doped CPM glass one-to-one match the excitation spectra at 362,381,393,400,413 and464 nm,which are related to the transitions of 7 F0→(5 D4,5 G2,5 L6,5 D3),7 F1→5 D3,and 7 F0→5 D2,respectively.In addition,a concave pyramid microstructure(CPM)is embedded in the glass surface to increase light transmittance.The average PCE increases to 14.61%±0.07%when a 5 wt%Eu^3+doped CPM glass covers on the silicon solar cell.Compared with the un-doped flat glass,a net increase of the PCE is0.41%,where the 0.16%increment of PCE is from the lighting trapping of the CPM structure,and the downshifting of near ultraviolet(NUV)light by Eu^3+ion donates the other 0.25%increment.It confirms that the as-prepared Eu^3+doped CPM glass has a good downshifting and antireflection function.展开更多
文摘氨(NH_(3))是一种无碳氢载体,比氢更易储运,且体积能量密度更高,因此直接氨燃料电池(DAFC)的研究具有重要的理论意义和实际价值.本工作研究PtIr/C阳极催化剂在不同工作温度下电催化活性及其对DAFC性能的影响,并探究了所用阴离子交换膜的渗氨量与DAFC性能的相关性.结果表明,从25~80℃,基于PtIr/C阳极催化剂的DAFC在80℃下获得最优性能,其开路电压(OCV) 0.50 V,峰值功率密度3.2 m W·cm^(-2),可归功于Pt-Ir合金的协同作用和升温提高了催化活性.不同温度下在DAFC阴极尾气中均检测到氨,且氨含量随温度升高而上升,致使阴极Pt/C催化剂毒化,从而使DAFC的开路电压和功率密度下降.
基金Project supported by National"Double First-class"Construction Special Funding Project(0290-X2100502)。
文摘The average photoelectric conversion efficiency(PCE)of a bare mono crystalline silicon solar cell is 14.71%±0.03%under AM1.5.It decreases to 14.20%±0.005%when covering an un-doped flat glass on the solar cell,and it goes down to 14.10%±0.005%by using a 5 wt%Eu^3+doped glass.The absorptions of the Eu^3+doped CPM glass one-to-one match the excitation spectra at 362,381,393,400,413 and464 nm,which are related to the transitions of 7 F0→(5 D4,5 G2,5 L6,5 D3),7 F1→5 D3,and 7 F0→5 D2,respectively.In addition,a concave pyramid microstructure(CPM)is embedded in the glass surface to increase light transmittance.The average PCE increases to 14.61%±0.07%when a 5 wt%Eu^3+doped CPM glass covers on the silicon solar cell.Compared with the un-doped flat glass,a net increase of the PCE is0.41%,where the 0.16%increment of PCE is from the lighting trapping of the CPM structure,and the downshifting of near ultraviolet(NUV)light by Eu^3+ion donates the other 0.25%increment.It confirms that the as-prepared Eu^3+doped CPM glass has a good downshifting and antireflection function.
