4.7 Article

Stable and efficient self-sustained photoelectrochemical desalination based on CdS QDs/BiVO4 heterostructure

期刊

CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132168

关键词

Photo-electrochemical desalination; Photoanode; Energy consumption; CdS QDs; BiVO4

资金

  1. National Key Research and Development Program of China [2019YFE0198000]
  2. Science and Technology Program of Guangzhou [2019050001]
  3. Education Department of Guangdong Province [2019KZDXM014]
  4. Scientific and Technological Plan of Guangdong Province [2018A050506078]
  5. SCNU Outstanding Young Scholar Project [8S0256]
  6. South China Normal University
  7. Science and Technology Development Fund, Macau SAR [0191/2017/A3, 0041/2019/A1, 0046/2019/AFJ, 0021/2019/AIR]
  8. University of Macau [MYRG2017-00216-FST, MYRG2018-00192IAPME]
  9. UEA funding
  10. International Science Program (ISP), Uppsala University, Sweden [01-2020-2021]
  11. Pearl River Talent Program [2019QN01L951]

向作者/读者索取更多资源

In this work, a stable and efficient photo-driven electrochemical desalination technique was proposed, utilizing CdS quantum dots sensitized BiVO4 photoanode and I-/I3- redox couples as the electrolyte. The results showed significant improvement in desalination performance and stability, attributed to the synergistic effect of CdS QDs and BiVO4 heterojunction.
Herein, we propose a stable and efficient photo-driven electrochemical desalination technique without any external bias. The whole desalination process is driven by CdS quantum dots (QDs) sensitized BiVO4 photoanode, where I-/I3- redox couples are recirculated as the electrolyte. Two salt streams are sandwiched between the photoanode and cathode. The salt ions in desalted stream are continuously extracted by the redox reaction of I-/ I3- electrolyte at their respective electrode chambers. The initial photocurrent of 2.58 mA/cm2 can be obtained in the present photoanode-assisted desalination device, which is much greater than the previous reported results. Besides, the electrical current of the photo-electricity conversion system is extremely stable in the current system. Within the four batch cycles, the variation of salt removal rate is as low as 2.3 mu g/(cm2 center dot min) without significant decay. The photoanode-electrolyte interface, charge separation and transportation are further investigated by photoluminescence, electrochemical impedance spectroscopy and Mott-Schottky analysis. The promising desalination performance can be attributed to the synergistic effect of CdS QDs and BiVO4 heterojunction which is applied in the field of solar-driven desalination for the first time. This work is significant for the design of high light-absorbing heterojunction photocatalysts for the dual functions of energy production and water desalination.

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