利用水热法制备石墨烯和Ag@TiO2核壳纳米颗粒（nanoparticles,NPs）共同修饰的染料敏化太阳能电池（dye-sensitized solar cell,DSSC）,研究石墨烯和Ag@TiO2纳米颗粒对光阳极和DSSC性能的影响.实验结果显示,掺入的Ag@TiO2纳米颗粒质量...利用水热法制备石墨烯和Ag@TiO2核壳纳米颗粒（nanoparticles,NPs）共同修饰的染料敏化太阳能电池（dye-sensitized solar cell,DSSC）,研究石墨烯和Ag@TiO2纳米颗粒对光阳极和DSSC性能的影响.实验结果显示,掺入的Ag@TiO2纳米颗粒质量分数为0.6%时,制备的DSSC性能最优,光电转换效率（photoelectric conversion efficiency,PCE）为5.84%,相比于纯TiO2光阳极DSSC提高了近20%.研究表明,石墨烯/Ag@TiO2染料敏化太阳能电池性能的提高,一方面是由于Ag@TiO2纳米颗粒的掺入增强了染料的光吸收能力;另一方面是由于石墨烯的引入显著改善了光阳极染料的吸附量,加快了载流子的传输,增加了载流子寿命,两者协同显著提高了DSSC的短路电流密度（short-circuit photocurrent density,J（sc））和光电转换效率.展开更多
Ag-modified TiO2 nanoflowers were prepared using a two-step process. The experimental process is green and free from contamination and can be synthesized directly at room temperature. Compared with pure TiO2, Ag-modif...Ag-modified TiO2 nanoflowers were prepared using a two-step process. The experimental process is green and free from contamination and can be synthesized directly at room temperature. Compared with pure TiO2, Ag-modified TiO2 enhances the absorption of visible light and effectively promotes the detachment of photoelectron pairs, Ag-TiO2 has a significantly enhanced visible light response activity to photodecomposition of methyl orange(MO). It is shown that the strong interaction between Ag nanoparticles and TiO2 enhances the photocatalytic activity of TiO2 nanoflowers. The self-made open-air reactor was used to test the photocatalytic performance of different samples. The results showed that Ag-modified TiO2 nanoflowers had excellent photodegradation ability. After repeated photodegradation of MO, Ag-modified TiO2 nanoflowers showed good stability.展开更多
基金Fund by the National Natural Science Foundation of China(51502005,51602005,and 51702003)the Key Foundation for Young Talents in College of Anhui Province(gxyq ZD2016081)the Quality Engineering Project in Colleges and Universities of Anhui Province(2017sxzx15 and 2018zygc012)
文摘Ag-modified TiO2 nanoflowers were prepared using a two-step process. The experimental process is green and free from contamination and can be synthesized directly at room temperature. Compared with pure TiO2, Ag-modified TiO2 enhances the absorption of visible light and effectively promotes the detachment of photoelectron pairs, Ag-TiO2 has a significantly enhanced visible light response activity to photodecomposition of methyl orange(MO). It is shown that the strong interaction between Ag nanoparticles and TiO2 enhances the photocatalytic activity of TiO2 nanoflowers. The self-made open-air reactor was used to test the photocatalytic performance of different samples. The results showed that Ag-modified TiO2 nanoflowers had excellent photodegradation ability. After repeated photodegradation of MO, Ag-modified TiO2 nanoflowers showed good stability.
文摘以钛酸丁酯为前驱体,溴化十六烷基三甲胺为制孔剂,采用一步水热法并结合光还原处理制备出银等离子基元负载多孔TiO2光催化剂.结果表明,所制得的Ag@Ag2S/porous TiO2催化剂为锐钛矿相,并有部分板钛矿相,其BET比表面积达243.9 m2/g,平均孔径为2.98 nm.由于银基表面等离子效应,催化剂光吸收边际红移到475nm处,其在可见光范围的响应明显增强,光生电子-空穴对更容易分离,因而催化剂活性明显增强.在氙灯(加滤光片使波长大于400 nm)照射下90 min Ag@Ag2S/porous TiO2可以使甲基橙脱色降解率达到98%.并且此催化剂在重复利用5次后,对甲基橙溶液的脱色降解率仍能保持在90%以上,具有稳定的光催化活性.采用抑菌环法,以大肠杆菌为实验菌种,对催化材料的抗菌性能进行了测试,结果表明,所制得的催化剂Ag@Ag2S/porous TiO2具有较好的抑菌效果,抑菌圈直径达到11 mm.
