Morphology engineering of rutile/anatase-TiO2 heterophase junctions for enhanced photoelectrochemical properties

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2025-05-23 Epub Date: 2025-04-25 DOI:10.1016/j.ijhydene.2025.04.184

Qun Liu , Yangdong Zhang , Xingyu Chen , Chunlin Zhao , Xiao Wu , Tengfei Lin , Zedong Xu , Min Gao , Cong Lin

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Abstract

TiO₂ is a promising photoelectrochemical (PEC) material as photoanodes for photoelectric conversion. However, severe charge recombination issues in TiO₂ significantly hinder the PEC efficiency and thus its application. It has been reported that the construction of rutile/anatase (R/A) heterophase junctions benefits fast charge transfer via interfaces and improves the efficiency of conversion. However, the evolution of R and/or A phases and their morphology and phase-transition effect on the PEC properties have not been investigated. In this study, unique TiO₂ heterophase junctions consisting of R-phase nanorods on the titanate-coexisting-phase (CO-phase) truncated octahedral particles were fabricated through a two-step hydrothermal method, where the morphology and phase transition of a titanate-coexisting phase was meticulously controlled and carefully monitored. The heterophase junctions exhibited superior PEC performances with a photocurrent density of 1.62 ± 0.05 mA cm⁻² at 1.23 V, which was 4.3 times and 1.6 times greater than that of pure R phase and R-nanorod/A-nanosheet, respectively. This work demonstrates the potential of morphology engineering and phase transition of photoanodes for highly efficient photoelectric conversion.

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金红石/锐钛矿- tio2异相结的形貌工程研究

TiO2是一种很有前途的光电化学（PEC）材料，可作为光电转换的光阳极。然而，TiO2中严重的电荷重组问题严重阻碍了PEC的效率，从而阻碍了其应用。金红石/锐钛矿（R/A）异相结的构建有利于通过界面快速转移电荷，提高转换效率。然而，尚未研究R相和/或A相的演变及其形态和相变对PEC性能的影响。在本研究中，通过两步水热法在钛酸共存相（co相）截断的八面体颗粒上制备了独特的由r相纳米棒组成的TiO2异相结，并对钛酸共存相的形貌和相变进行了细致的控制和监测。在1.23 V下，异相结的光电流密度为1.62±0.05 mA cm−2，分别是纯R相和R-纳米棒/ a -纳米片的4.3倍和1.6倍。这项工作证明了光电阳极的形态工程和相变在高效光电转换方面的潜力。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.