Journal
CHEMICAL ENGINEERING JOURNAL
Volume 430, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132936
Keywords
Multilayer structures; WO3; Hydrothermal reaction; Photoelectrochemical water splitting
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Funding
- National Natural Science Foundation of China (NSFC) [22008165, 51972178]
- China Postdoctoral Science Foundation [2020M681966]
- exchange project of the sixth China-Northern Macedonia Science and Technology Meeting [6-11]
- Natural Science Foundation of Ningbo Municipal Government [202003N4164]
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The study demonstrates the controlled growth of MXenes-like WO3 architecture in transition metal oxides by modulating the formation process based on the competition between concentrations of WO42- and anions (NO3-, Cl-) in the solution. The multilayer WO3 structure shows superior physical performance, with a remarkable photocurrent density of 2.3 mA cm(-2) under AM 1.5G illumination, the highest reported for WO3 photoanodes without cocatalysts/dopants in neutral solution.
Currently, the multilayer architecture is recognized as one of shining stars with exciting applications in environment and catalysis, energy storage/conversion, optoelectronics and so forth. However, different to the typical MXenes, the fabrication of layered transition metal oxides is still a grand challenge, since they are highly difficult to be exfoliated into multilayered structures, owing to their intrinsically strong covalent bond. Here, we report the controlled growth of MXenes-like WO3 architecture in the families of transition metal oxides with perfectly multilayered features, by tailoring the formation of precursor WO3 center dot H2O based on the competition between the concentrations of WO42 -and anions (NO3-, Cl-) within the solution. The as-built multilayer WO3 architecture has overall superior physical performance to conventional solid counterparts, and exhibits a remarkable photocurrent density of 2.3 mA cm(-2) at 1.23 vs. RHE under AM 1.5G illumination, which is the highest one among those of WO3 photoanodes without cocatalysts/dopants in neutral solution ever reported.
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