在解剖酶TiO2中使用双剂的DFT指导设计,以促进储存
Shuang Li1, Xu Wen1, Xin Miao1
1College of Energy Materials and Chemistry, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.
Nano letters
|November 13, 2024
概括
和双二氧化 (TiO2) 增强了离子电池阳极. 这种双重兴奋剂策略提高了电化学性能,为先进的能量存储提供了高容量和长周期寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 解剖氧化 (TiO2) 是离子电池 (SIB) 的一个有前途的阳极材料.
- TiO2面临着一些挑战,包括缓慢的离子扩散和电导率差.
- 优化TiO2性能对于推进SIB技术至关重要.
研究的目的:
- 为SIBs开发一种新的和双TiO2阳极材料.
- 研究和对TiO2电化学性能的合作兴奋作用.
- 为了确定最佳的兴奋剂比率来提高SIB性能.
主要方法:
- 密度功能理论 (DFT) 的计算指导材料设计.
- 和的合成和表征双化TiO2.2.
- 作为SIB阳极的合TiO2的电化学测试.
主要成果:
- DFT和实验结果证实了N和Se兴奋剂的协同效应.
- 最佳的N/Se比率 (1:3) 显著提高了电化学性能.
- N,Se-doped TiO2 阳极表现出高放电能力 (142 mAh g-1 在 2 A g-1).
- 实现了卓越的速率能力 (82 mAh g-1 在 20 A g-1) 和超长周期性 (97% 保留超过 5000 个周期).
结论:
- 双 heteroatom 兴奋剂是一种有效的策略,用于增强 SIB 中的 TiO2 阳极材料.
- 开发的N,Se-doped TiO2提供了卓越的储存性能.
- 这项工作为下一代储能设备的合理材料设计提供了洞察力.
相关概念视频
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
01:26EDTA: Auxiliary Complexing Reagents
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...