Energy band modulation of N‐doped rutile/anatase TiO 2 photoanode promoting charge separation toward prominent photoelectrochemical performance
Source abstract
Abstract
Abstract To solve the problem of high photogenerated carrier recombination rate and low photoelectric conversion efficiency of TiO 2 ‐based materials, a simple N‐doped anatase/rutile TiO 2 heterophase nanorod film was designed by a low‐temperature hydrothermal method in this work. The enhanced separation and transport of photogenerated charges were facilitated by the smaller contact barrier and appropriate band matching between anatase TiO 2 nanoparticles and rutile TiO 2 nanorods. The introduction of N doping in anatase TiO 2 resulted in an upward shift of the valence band and a narrowing of the band gap, consequently enhancing the efficiency of visible light utilization. The combination of the heterophase junction and N‐doping exhibited a synergistic effect, effectively suppressing the recombination of photogenerated charges and enhancing the photoelectric conversion efficiency of the photoanode. Under AM 1.5G irradiation, the photocurrent density ( J ) of the A‐TO(N)@R‐TONR photoanode reached 2.19 mA·cm −2 ( V RHE, 1.23 eV ). Additionally, the incident photon‐electron conversion efficiency (IPCE) and the charge injection efficiency ( η ) reached 81.4% and 51.6% at 320 nm. Furthermore, the J , IPCE, and η values of the A‐TO(N)@R‐TONR photoanode were 2.96, 2.1 and 3.2 times those of pure R‐TONR photoanode, respectively. This work presents a rational strategy for designing efficient TiO 2 ‐based photoanodes.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanics and Photoelectric Physics Anhui University of Science and Technology 232001 Huainan China
School of Materials Science and Engineering Anhui University 230039 Hefei China
Tianneng Battery (Wuhu) Co. Ltd. 241000 Wuhu China
School of Materials Science and Engineering Anhui University of Science and Technology 232001 Huainan China
Funding
University Natural Science Research Project of Anhui Province · Graduate Innovation Fund of Anhui Province
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