FUEL
·
2024
·
IF 6.7
Biao Ran,Yun Wu,Kaiyang Zhang,Rui Yao,Jinping Li,Guang Liu
In the evolution of proton exchange membrane (PEM) electrolysis, the development of durable electrocatalysts for the acidic oxygen evolution reaction (OER) is crucial. This work introduces an electrocatalyst with a core–shell architecture, consisting of amorphous iridium oxide (IrO x ) supported on lanthanum (La) and niobium (Nb) co-doped titanium dioxide (denoted as La, Nb-TiO 2 @IrO x ). The resultant La, Nb-TiO 2 @IrO x , synthesized via a hydrothermal method, exhibits enhanced OER activity and remarkable durability in acidic media. The theoretical calculations provide insight into the enhanced performance of La, Nb-TiO 2 @IrO x , revealing a narrowed bandgap and improved conductivity due to co-doping. Additionally, there is an increase in charge transfer and binding energy at the heterointerface. As a result, electrochemical evaluations show a significant reduction in overpotential and enhancement in long-term stability, achieving an overpotential of 234 mV at 10 mA cm −2 and maintaining impressive stability for 150 h. These findings underscore the potential of La, Nb-TiO 2 as a robust platform for acidic OER electrocatalysts, offering valuable insights into the design of durable and efficient systems for energy conversion applications and advancing the development of next-generation technologies.
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
Qiang Gao,Xiaomei Wu,Xiangsheng Ma
Series of novel energy-saving window coatings based on F–Nb–TiO 2 /SiO 2 nanocomposites with superhydrophobic self-cleaning performance were successfully prepared. Surface modification of F–Nb–TiO 2 and SiO 2 nanoparticles by aminopropyl triethoxy silane and perfluorooctyltriethoxysilane produced hydrophobic powders. With the help of the hierarchical structures of F–Nb–TiO 2 /SiO 2 nanocomposites, superhydrophobic surfaces were obtained. The water contact angle of the composite coatings reached 155.6°. The prepared superhydrophobic coatings shown superior anti-fouling property and good mechanical performance. Furthermore, the composite coating can shield most of solar radiation. The composite coating lowed the air temperature of the simulate house by 11 °C in the outdoor thermal experiments. The integration of good solar filtration and exceptional anti-fouling performance makes F–Nb–TiO 2 /SiO 2 coatings suitable candidates for energy-saving window coatings.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengran Li,Jialing Gu,Qinke Tang,Jiabao Bai,Bin Cui,Ruoyu Ma,Yunfeng Zhu,Rui Shi,Yao Zhang,Jiguang Zhang,Yana Liu,Jun Wang,Zhixin Ba,Xiaohui Hu
Magnesium hydride (MgH 2 ) is a highly promising solid-state hydrogen storage material, but its application is hindered by sluggish kinetics and high operating temperatures. Currently, alloying and catalysis are effective strategies for improving the hydrogen storage performance of MgH 2 , but the designing of a hydrogen ab/desorption system which synergistically combines them remains a challenge. Herein, Mg Al solid solution and intermetallic compounds (Al species), and a spherical Nb-doped TiO 2 (Nb-TiO 2 ) were introduced into Mg/MgH 2 to enhance the hydrogen storage performance. Al species significantly enhanced the dehydrogenation thermodynamics of Mg 90 Al 10 - 15 at.% Nb-TiO 2 , while improving the hydrogen ab/desorption kinetics of the composite synergistically with the Nb-TiO 2 . Density functional theory (DFT) calculations revealed that the synergism of Al species and Nb-TiO 2 led to preferential adsorption of H atoms at the interfaces of Nb-TiO 2 and Mg 17 Al 12 , with abundant electron transfer. The dehydrogenation enthalpy ( ΔH ) of Mg 90 Al 10 - 15 at.% Nb-TiO 2 decreased from 80.86 (MgH 2 ) to 69.05 kJ/mol, while its hydrogen desorption apparent activation energy ( E a ) decreased from 146.40 (MgH 2 ) to 88.80 kJ/mol simultaneously. The composite could absorb 4.70 wt% H 2 within 2000 s at 200 °C and showed a dehydrogenation onset temperature of 209 °C. This work reveals a synergistic effect between alloying and catalysis, advancing both the performance enhancement strategies and the mechanistic understanding of Mg-based hydrogen storage materials.
研究领域:
材料科学
·
氢储能
·
固态化学
·
计算材料学
·
纳米催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2020
·Vol. 32
·期 6
·1370-1378
·
IF 2.544
Li Xu,Yan Yi,Gaorui Liang,Wen Zhang
To improve the service life of SnO 2 −Sb electrodes in degradation of refractory wastewater, we report anodic information of tin oxide antimony on top of Nb−TiO 2 nanotubes (Nb−Ti/Nb−TiO 2 −NTs/ATONPs) prepared through screen-printing. It was found that the Nb−Ti/Nb−TiO 2 −NTs/ATONPs anodes presented a significantly enhanced in electro-catalytic oxidation performance (in Acid Red 73) compared to titanium-based tin antimony electrodes (Ti/ATONPs). Additionally, the electrochemical properties and the stability were further studied by the electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), cyclic voltammetry (CV), chronoamperometry (CA) measurements and accelerated life test, respectively. These results indicated that Nb−TiO 2 −NTs/ATONPs anode possessed Nb−TiO 2 nanotubes which exhibited a higher oxygen evolution potential (2.24 V vs. Ag/AgCl), as well as a better wettability, a larger current at constant potential and 2.1 times longer lifetime than the conventional Ti/ATONPs anode.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）