Novel dual-photoelectrode photoelectrocatalytic system based on TiO2 nanoneedle arrays photoanode and nitrogen-doped carbon dots/Co3O4 photocathode for efficient water purification at low/no applied voltage

被引：48
作者：
Hu, Zhongzheng [1 ,2 ]
Zhou, Minghua [1 ,2 ]
Maitlo, Hubdar Ali [1 ,2 ]
Liang, Ruiheng [1 ,2 ]
Zheng, Yang [1 ,2 ]
Wu, Huizhong [1 ,2 ]
Song, XiangRu [1 ,2 ]
Arotiba, Omotayo A. [3 ,4 ]
机构：
[1] Nankai Univ, Coll Environm Sci & Engn, Tianjin Key Lab Environm Technol Complex Transmedi, Tianjin 300350, Peoples R China
[2] Nankai Univ, Coll Environm Sci & Engn, Tianjin Adv Water Treatment Technol Int Joint Res, Tianjin 300350, Peoples R China
[3] Univ Johannesburg, Dept Chem Sci, ZA-2028 Doornfontein, South Africa
[4] Univ Johannesburg, Ctr Nanomat Sci Res, Johannesburg, South Africa
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 331卷
基金：
新加坡国家研究基金会;
关键词：
Photoelectrocatalysis; Dual-photoelectrode; Mechanism; Low applied voltage; Water Purification; TOTAL-ENERGY CALCULATIONS; PHOTOCATALYTIC ACTIVITY; DEGRADATION; OXIDATION; MECHANISM; SEMICONDUCTORS; BARRIER;
D O I：
10.1016/j.apcatb.2023.122676
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A novel tandem photoelectrocatalysis (PEC) cell consisting of TiO2 nanoneedle arrays (TiO2 NNs/Ti mesh) photoanode and nitrogen-doped carbon dots (NCDs) modified Co3O4 photocathode (NCDs/Co3O4/Ti mesh) is designed to work at low/no applied voltage. Electrochemical impedance spectroscopy, incident photo-to-current conversion efficiency, and open-circuit voltage confirmed enhancement in the photogenerated charge transfer efficiency and internal photovoltage, which is due to synergistic effect in combination of two photoelectrodes. Under light-emitting diode (LED) light irradiation and cell voltage of 0.4 V, the system represented high activity and stability (0.0527 min-1 after 20 cycles) and energy efficiency (2.09 kWh m- 3 order-1) for sulfadiazine removal. Based on the main & BULL;OH-induced reaction, the cooperative operation mechanism of TiO2 NNs/Ti mesh and NCDs/Co3O4/Ti mesh for sulfadiazine degradation was elaborated. Finally, the high performance under real water matrices or real sunlight irradiation without external voltage confirmed the feasibility of this PEC system in practical application for efficient water purification.
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页数：15
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