Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 606, Issue -, Pages 1274-1283Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.131
Keywords
TiO (2); Gold; Carbon dots; Photoelectrochemistry; Oxygen evolution reaction
Categories
Funding
- National MCF Energy RD Program [2018YFE0306105]
- National Key Research and Development Program of China [2017YFA0204800, 2020YFA0406103, 2020YFA0406104, 2020YFA0406101]
- Innovative Research Group Project of the National Natural Science Foundation of China [51821002]
- National Natural Science Foundation of China [51902217, 91961120, 51725204, 21771132, 51972216, 52041202]
- Natural Science Foundation of Jiangsu Province [BK20190041]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- 111 Project
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
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The study constructed a TiO2/NCD/Au composite catalyst and found that it exhibited excellent performance in photoelectrochemical catalysis, especially in increasing the separation quantity and rate of electron-hole pairs.
The dynamic behavior of electron-hole pairs at the interface of the nanocomposites is important for photoelectrochemical catalysis, but it is difficult to characterize. Here we construct a ternary titanium dioxide/ nitrogen-doped carbon dot/gold (TiO2/NCD/Au) complex as the model catalyst to investigate the kinetic indexes at their interfaces. Under irradiation (200 mW cm(-2)), the photocurrent density of TiO2/NCD/Au is 10.26 mA cm(-2), which is higher than those of TiO2/Au (4.34 mA cm(-2)), TiO2/NCD (7.55 mA cm(-2)) and TiO2 (3.34 mA cm(-2)). The evolved oxygen of TiO2/NCD/Au reaches 125.8 lmol after 5000 s test. The energy bands of complexes are very similar to that of the unmodified TiO2 catalyst due to the low content modification of NCDs and Au. In addition, the transient photovoltage (TPV) tests with a series of control samples show differences about the carriers' separation and transfer process, which verify that Au can increase the separation quantity of electron-hole pairs while NCDs play a more important role on the increase of the separation quantity and separation rate simultaneously. This work quantifies the function of each component in a composite catalyst and deepens the understanding of the catalyst interface design. (C) 2021 Elsevier Inc. All rights reserved.
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