ChemCatChem
·
2014
·Vol. 6
·期 8
·2258-2262
·
IF 5.044
Yang Qu,Wei Zhou,Zhiyu Ren,Guofeng Wang,Baojiang Jiang,Honggang Fu
Graphical Splittin' up is hard to do: Pure porous Zn 2 Ti 3 O 8 nanorods are synthesized by using the glycolate precursor route followed by calcination. The nanorods display good activity in photocatalytic overall water splitting owing to a suitable band gap and their 1 D porous structure. The pure-phase Zn 2 Ti 3 O 8 nanorods, as a new member of the perovskite catalyst family, provide deeper understanding of the design of photocatalysts for overall water splitting. EG=ethylene glycol, TBT=tetra- n -butyl titanate. Metastable-phase porous Zn 2 Ti 3 O 8 nanorods as photocatalysts for overall water splitting, coupled with RuO 2 as co-catalysts, were synthesized by using ethylene glycol as a phase-stabilizing and 1 D structure-directing agent. The typical electronic energy band gap of Zn 2 Ti 3 O 8 was confirmed to be excellent for overall water splitting photocatalysts by theoretical calculations and experimental results. Steady and stoichiometric H 2 and O 2 evolutions were observed, which increased with time. The yields of H 2 and O 2 were near to 4 and 2 μmol h −1 (0.1 g), respectively. The excellent overall water-splitting activities could be attributed to the pure metastable phase of Zn 2 Ti 3 O 8 possessing a suitable band gap and the porous 1 D structure favoring acceleration of the photogenerated charge transportation and separation.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Meiyu Yuan,Yingying Zhu,Junjie Fu,Shiyu Xu,Xiaodong Wu,Zihan Wang,Man Yuan,Zihao Song,Sheng Cui
Photocatalytic degradation, as advanced oxidation methods with high efficiency and good stability, is considered a promising method to alleviate antibiotic pollution. Herein, we prepared a novel Zn 2 Ti 3 O 8 aerogel by a simple sol-gel method based on the advantages of the abundant pore structure of aerogel material and the high photocatalytic activity of zinc titanate . The Zn 2 Ti 3 O 8 aerogel shows a typical homogeneous structure and low band gap width (3.32 eV), which could achieve photogenerated carrier separation and transfer under simulated sunlight. The material has high specific surface area (120.1 m 2 /g) and abundant pore structure, which can provide multiple diffusion channels for pollutant molecules and generate massive reactive sites. In the absence of cocatalysts, the prepared Zn 2 Ti 3 O 8 aerogel can achieve more than 95% degradation efficiency for 50 mg/L of ofloxacin (OFL) contaminated solution in 60 min. Electrochemical impedance spectroscopy (EIS) and transient photocurrent test results display that Zn 2 Ti 3 O 8 aerogel exhibits the highest photocurrent density and lower charge transfer resistance. Meanwhile, the results of density functional theory (DFT) are consistent with the characterization results of electron spin resonance (ESR). The ·OH and ·O 2 − generated in the catalytic reaction could attack OFL molecules from different regions to achieve the purpose of decomposition. We believe that the as-prepared Zn 2 Ti 3 O 8 aerogels are expected to be used in the practical treatment of catalytic degradation of OFL and other antibiotic pollutants.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Wenming Liao,Wanfei Li,Jianhua Tian,Qingbo Xiao,Mimi Dai,Guoguang Xu,Yanfang Li,Hongzhen Lin
A rational strategy for the synthesis of ternary cubic phase Zn 2 Ti 3 O 8 solid spheres has been developed for application in lithium ion batteries . In this process, titanium glycolate solid spheres are used as nanostructure template and titanium source, whose functional groups are replaced by zinc ions through a solvothermal ion exchange method in accordance with the Zn/Ti atomic ratio of 2:3. When adjusting the Zn/Ti atomic ratios to 0:3, 1:3, the anatase TiO 2 solid spheres and multiphase complex of TiO 2 /ZnTiO 3 solid spheres can be obtained. However, with the increasing of Zn/Ti atomic ratio to 3:3, in addition of cubic phase Zn 2 Ti 3 O 8 solid spheres, a lot of hexagonal ZnO nanoparticles are synthesized. As anodes for lithium ion batteries, the delivered capacities of Zn 2 Ti 3 O 8 solid spheres are higher than those of TiO 2 and TiO 2 /ZnTiO 3 solid spheres at 300 mA g −1 . Notably, the high purity cubic phase Zn 2 Ti 3 O 8 solid spheres can still release a reversible capacity of 146.7 mAh g −1 even at 2000 mA g −1 over 1000 cycles. Also, the Zn 2 Ti 3 O 8 solid spheres show a good electrochemical performance in the full cells. The superior electrochemical properties are ascribed to the favorable crystal structure and highly developed porous structure of Zn 2 Ti 3 O 8 solid spheres.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Meiyu Yuan,Yaojun Dong,Panpan Zhou,Sheng Cui,Zhongwei Chen
The persistent discharge of ofloxacin (OFL) into aquatic environments poses severe ecological threats. However, conventional titanium-based photocatalysts suffer from limited visible-light response and rapid charge recombination. Herein, self-supporting Zn 2 Ti 3 O 8 /ZnTiO 3 Type-II heterojunction aerogel was synthesized via a sol-gel pathway coupled with supercritical CO 2 drying and thermal modulation. Comprehensive XRD and HRTEM/SAED analyses confirm the synchronous crystallization of cubic Zn 2 Ti 3 O 8 and hexagonal ZnTiO 3 , establishing an intimate heterojunction interface. Meanwhile, SEM observation reveals a highly continuous 3D interconnected porous aerogel framework. Calcined at 750 ℃, the optimized aerogel beautifully preserves a hierarchically porous network with an expansive specific surface area, providing abundant active sites and fast mass transfer channels. Consequently, the heterojunction aerogel sample achieves an exceptional OFL degradation efficiency exceeding 96% within 60 min under simulated solar light, obeying pseudo-first-order kinetics. Photoelectrochemical profiling and ESR analyses verify that the staggered Type-II alignment robustly suppresses carrier recombination, accelerating charge separation to harvest active free radicals (·O 2 - and ·OH) for OFL mineralization. Furthermore, density functional theory (DFT) and frontier molecular orbital calculations corroborate the hybridized electronic structure and unveil the targeted radical attack pathways for molecular cleavage. This work provides a compelling paradigm to merge heterojunction chemistry with structural aerogel design for environmental remediation.
✓ 已验证
DOI
高影响因子
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