Dye-sensitized photoelectrochemical cell on plasmonic Ag/AgCl @ chiral TiO2 nanofibers for treatment of urban wastewater effluents, with simultaneous production of hydrogen and electricity
Dye-sensitized photoelectrochemical cell on plasmonic Ag/AgCl @ chiral TiO2 nanofibers for treatment of urban wastewater effluents, with simultaneous production of hydrogen and electricity
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DOI：
10.1016/j.apcatb.2014.11.012
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发表时间：
2015-06
影响因子：
22.1
通讯作者：
Dawei Wang;Yi Li;G. L. Puma;Chao Wang;Peifang Wang;Wenlong Zhang;Qing Wang
中科院分区：
文献类型：
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作者：
Dawei Wang;Yi Li;G. L. Puma;Chao Wang;Peifang Wang;Wenlong Zhang;Qing Wang
首次证明了在染料敏化光电化学电池(DSPC)中同时生产氢气和电力并同时去除“实际”城市废水中的污染物的可行性。染料敏化二氧化钛的光阳极是一种新型的纳米结构等离子体Ag/AgCl@手性二氧化钛纳米纤维(手性二氧化钛纤维负载有银和氯化银纳米颗粒)。以实际废水为电解液，加入雌激素(17-β-乙炔基雌二醇)和重金属(Cu2+)。废水中的污染物而不是I-−/I-3-−(传统的DSPC中通常的电解液)是这种DSPC中稳定电荷的电子桥。在可见光照射下，总有机碳(TOC)、Cu2+、EE2几乎全部去除，总氮(TN)去除70%。光能转换效率较高(PCE为3.09%)，约98%的电能在溶解氧(DO)、Cu2+和TN的消耗后转化为H_2。这一性能归因于二氧化钛手性纳米纤维和纳米银颗粒在光阳极上的等离子体激元效应之间的共生关系，尽管银可能是阻碍发电的复合位置。本研究中的染料N719表现出暂时的增感效应，未来有望研究更有效的增感剂。这项研究为从废水处理过程中生产可再生能源开辟了新的机会，包括作为可行资源的有机和无机物。
The feasibility of simultaneous production of hydrogen and electricity with simultaneous contaminants removal from “actual” urban wastewater within a dye-sensitized photoelectrochemical cell (DSPC) is demonstrated for the first time. The photoanode in the DSPC was a novel nanostructured plasmonic Ag/AgCl @ chiral TiO2nanofibers (Ag and AgCl nanoparticles supported on chiral TiO2nanofibers). The electrolyte in the DSPC was actual wastewater to which an estrogen (17-β-ethynylestradiol, EE2) and a heavy metal (Cu2+) were added. The contaminants in the wastewater rather than I−/I3−(usual electrolyte in conventional DSPCs) acted as electrons’ bridges for the stabilization of charges in this DSPC. Almost total removal of total organic carbon (TOC), Cu2+, EE2, and 70% removal of total nitrogen (TN) were achieved under visible-light irradiation. A relatively high solar energy conversion efficiency (PCE 3.09%) was recorded and approximately 98% of the electricity was converted to H2after the consumption of dissolved oxygen (DO), Cu2+and TN. This performance was attributed to the “symbiotic” relationship between the TiO2chiral nanofibers and the plasmonic effect of Ag nanoparticles at the photoanode, although Ag may act as a recombination site which may hinder the generation of electricity. The dye N719 in this study exhibited a temporary sensitization effect, and a more efficient sensitizer is expected to be studied in the future. This study opens up new opportunities for producing renewable energy from wastewater treatment processes including organic and inorganic matter as viable resources.