Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 4, Pages 5127-5135Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00470
Keywords
photoelectrochemistry; spray pyrolysis deposition; porous nanostructures; charge separation; CuBi2O4
Funding
- National Natural Science Foundation of China (NSFC) [21905288, 51904288]
- Zhejiang Provincial Natural Science Founda-tion [LZ21B030001]
- K.C. Wong Education Foundation [GJTD-2019-13]
- Ningbo major special projects of the Plan Science and Technology Innovation 2025 [2018B10056, 2019B10046]
- Ningbo 3315 Program
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A general solution method using citrate to prepare nanoporous oxide thin films with controllable porosity was reported. The impacts of morphology on photoelectrochemical performance were studied using CuBi2O4 as a model material. The synthesis technique can be applied to prepare crystallized nanoporous oxide thin films with tunable morphologies for photovoltaic and other catalytic applications.
Developing facile approaches to prepare well-designed semiconductor nanostructures is an important goal for solar water splitting. Herein, a general solution method is reported that employs citrate to complex diverse metal cations and affords uniform nanoporous multiple oxide thin films with controllable porosity by spray pyrolysis. By using CuBi2O4 as a model material, a remarkable improvement in internal quantum efficiency and the impacts of the morphology on photoelectrochemical (PEC) performance is demonstrated. The morphology can be controlled by kinetically coordinating the relative rates between the gelation and the auto-combustion of citrate in the spraying process. Furthermore, the synthesis technique can be applied in a general fashion to the preparation of a wide variety of well-crystallized nanoporous oxide thin films with tunable morphologies for PEC and other heterogeneous catalysis applications.
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