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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (9): 1481-1489.DOI: 10.16553/j.cnki.issn1000-985x.2026.0077

• 研究论文 • 上一篇    下一篇

Co/Fe/Ni掺杂LaTiO3电子结构调控与光催化性能的第一性原理对比研究

陈美竹1(), 王傲1, 张冠伦1, 李金英1(), 杨春维2   

  1. 1.吉林师范大学物理学院,四平 136000
    2.吉林师范大学工程学院,四平 136000
  • 收稿日期:2026-04-29 出版日期:2026-09-20 发布日期:2026-09-29
  • 通信作者: 李金英,博士,副教授。E-mail:lijinying@jlnu.edu.cn
  • 作者简介:陈美竹(2003—),女,吉林省人,硕士研究生。E-mail:2631564468@qq.com
  • 基金资助:
    吉林省教育厅科学技术研究项目(JJKH20262366CY)

First-Principles Comparative Study on Electronic Structure Modulation and Photocatalytic Performance of Co/Fe/Ni-Doped LaTiO3

CHEN Meizhu1(), WANG Ao1, ZHANG Guanlun1, LI Jinying1(), YANG Chunwei2   

  1. 1.College of Physics,Jilin Normal University,Siping 136000,China
    2.College of Engineering,Jilin Normal University,Siping 136000,China
  • Received:2026-04-29 Online:2026-09-20 Published:2026-09-29

摘要: 为突破LaTiO3光响应范围窄、光催化分解水热力学受限的瓶颈,采用第一性原理计算对比了Co、Fe、Ni单掺杂对LaTiO3性能的调控机制。结果表明:三种掺杂体系形成能均为负,其中Ni掺杂最低(-1.14 eV);声子谱无虚频,所有体系均动力学稳定。纯相LaTiO3带隙为2.299 eV,Co、Fe、Ni掺杂后分别降至1.674(间接带隙)、1.405和0.928 eV。其中Fe、Ni掺杂的带隙过窄,难以满足全解水热力学要求(≥1.23 eV)。-COHP与Bader电荷分析证实,M—O净成键强度从高到低依次为Co—O、Fe—O、Ni—O,电荷转移强度从高到低依次为Ni掺杂、Co掺杂、Fe掺杂,其中Ni掺杂电荷转移量最大(失1.15 e),Co掺杂使吸收边红移至520 nm,可见光吸收系数峰值达2.0×105 cm-1;Co掺杂使功函数升至3.05 eV,归因于费米能级附近电子态密度重构。综合带隙、光吸收与载流子分离性能,Co掺杂是改性LaTiO3用于光催化分解水的最优方案。本研究为钙钛矿基光催化材料的掺杂设计优化提供理论支撑。

关键词: LaTiO3; 钙钛矿; 过渡金属掺杂; 电子结构; 第一性原理计算

Abstract: To overcome the bottlenecks of narrow photoresponse range and the thermodynamic limitations for photocatalytic water splitting in LaTiO3, first-principles calculations were performed to compare the modulation mechanisms of Co, Fe, and Ni single-doping. The results show that all three doped systems exhibit negative formation energies, with Ni doping yielding the lowest value (-1.14 eV). Phonon spectra display no imaginary frequencies, confirming the kinetic stability of all systems. The band gap of pristine LaTiO3 is 2.299 eV, which decreases to 1.674 (indirect band gap), 1.405, and 0.928 eV for Co, Fe, and Ni doping, respectively. Notably, the band gaps for Fe and Ni doping are too narrow to satisfy the thermodynamic requirement for overall water splitting (≥1.23 eV). -COHP and Bader charge analyses confirm the enhanced M—O covalency after doping, with the net bonding strength from high to low following the order of Co, Fe, and Ni doping, while the charge transfer strength from high to low follows the order of Ni, Co, and Fe doping, with Ni doping exhibiting the largest charge transfer (electron loss of 1.15 e). Co doping shifts the absorption edge to 520 nm, achieving a peak visible-light absorption coefficient of 2.0×105 cm-1, and increases the work function to 3.05 eV, which is attributed to the reconstruction of the electronic density of states near the Fermi level. Based on the comprehensive evaluation of band gap, optical absorption, and charge carrier separation performance, Co doping is identified as the optimal strategy for modifying LaTiO3 for photocatalytic water splitting. This study provides theoretical support for the design and optimization of perovskite-based photocatalytic materials through doping.

Key words: LaTiO3; perovskite; transition metal doping; electronic structure; first-principles calculation

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