Catalysis Science & Technology
·
2015
·Vol. 6
·期 4
·1033-1041
·
IF 5.426
Yansong Zhou,Gang Chen,Yaoguang Yu,Lichen Zhao,Qilin Yu,Qiang He
In this work, lanthanum (La) has been proven as an effective space charge layer modifier to promote efficient photogenerated charge carrier separation for ZnO:GaN solid solution photocatalysts with enhanced photocatalytic water-splitting performance. Photogenerated electron–hole pairs are effectively separated due to the increase of the thickness of the space charge layer after La-doping. The stable photocatalytic activity of the ZnO:GaN solid solution photocatalysts for overall water-splitting was remarkably enhanced by about 3.4 times when the La-doping concentration was 3% in atom ratio. The maximum apparent quantum efficiency of the La-doped (3% in atom percentage) ZnO:GaN solid solution photocatalyst for photocatalytic water oxidation was up to 14.5% at 350 nm without loading of any co-catalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Liqi Xiao,Zean Xie,Shaojia Song,Zhiping Zhao,Ming Ke,Weiyu Song,Zhen Zhao,Jian Liu
Recently, coordinated unsaturated TiO2 due to the oxygen vacancy has been found to have good application prospects in propane dehydrogenation (PDH) reactions. The oxygen vacancy can be effectively adjusted by metal doping into TiO2. In the present paper, density functional theory calculations were conducted to study the PDH reaction of TiO2 doped with transition metals in the fourth period with the aim to screen for an effective doping metal. A good linear relationship was found between the calculated turnover frequency and co-adsorption energy of H and Propyl species, justifying such co-adsorption energy as a useful descriptor for screening PDH catalysts. Compared with pure-phase TiO2, V-doped TiO2 exhibits a lower propane C–H bond breaking energy barrier (0.93 eV) and a higher TOF (5.67 × 10–3 s–1) value. According to the calculation results, the V-doped TiO2 catalyst was successfully synthesized. The experimental results show that the r(C3H6) rises with V doping.
研究领域:
材料科学
·
化学工程
·
催化反应
✓ 已验证
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 12
·4458-4465
·
IF 2.054
Lv Xiangyong,Liang Guangfen,Wang Qinzheng,Li Yandong,Duan Huamei,Chen Dengfu,Long Mujun,Hu Qingqing,Han Funian,Li Linpei
In this study, we prepared reduced graphene oxide (rGO) from natural graphite by a redox method. The salts Cu(NO 3 ) 2 and Ni(NO 3 ) 2 , Cu(NO 3 ) 2 and Zn(NO 3 ) 2 , Cu(NO 3 ) 2 , Ni(NO 3 ) 2 , and Zn(NO 3 ) 2 are loaded onto rGO by an impregnation method. The support material is calcined to obtain the fresh catalyst. The catalysts are analyzed by thermogravimetric analysis, x-ray diffraction, x-ray photoelectron spectroscopy, Raman analysis, and scanning and transmission electron microscopic imaging. The results showed that Ni and Zn are evenly distributed on the carrier. The size of the copper crystals in CuNi-rGO and CuZn-rGO is smaller than that of Cu-rGO. The smaller the copper crystal, the more easily Cu 2+ can be reduced to Cu 0 and Cu + .
The addition of Ni and Zn can promote reduction of Cu 2+ to Cu 0 and Cu + and may significantly improve the catalytic performance.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 7
·2045-2055
·
IF 2.482
Li Chaoqun,Yang Yang,Ren Wei,Wang Jian,Zhu Tingyu,Xu Wenqing
Abstract CO is toxic and detrimental to human beings and the atmosphere. The presence of CO has become one of the important indicators for evaluating ambient air quality. Iron and steel sintering generate large amounts of flue gas emissions containing approximately 1% CO, which has become an important factor restricting the improvement of air quality in steel cities. The catalytic oxidation method is the simplest and most effective method for CO emission control. In this work, a series of Cu x Ce y /TiO 2 catalysts with different Ce doping levels were prepared by a one-step impregnation method and subsequently tested for catalytic CO oxidation. The Cu 0.5 Ce 0.5 /TiO 2 sample has the best catalytic activity under the conditions of 1% CO and 10% H 2 O. The catalysts were next characterized by XRD, BET, TEM, H 2 -TPR, XPS and in-situ DRIFTS methods. The characterization results show that Ce doping promotes the dispersion of copper species on the catalyst surface and improve the redox performance of the catalyst. The results of in-situ experiments showed that both Cu/TiO 2 and Cu 0.5 Ce 0.5 /TiO 2 catalysts followed Mars and van Krevelen mechanism, and Ce doping enhanced the adsorption and activation of oxygen, thus improving the low-temperature reaction activity of the catalysts. Graphic Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Menghui Han,Fangyuan Cheng,Kui Xie
Porous single crystals (PSCs) are a novel class of solid-phase materials with tailored porosity. The long-range ordered lattice and interconnected pore structure in three dimensions enable them to minimize energy losses and maintain heightened catalytic activity and stability in electrochemical systems. In the process of electrocatalytic water splitting, transition metal oxides Fe2O3 and Co3O4 are regarded as highly promising catalytic materials for the oxygen evolution reaction (OER). Here, we employed a lattice reconstruction strategy to grow porous single crystals of Fe2O3 and Co3O4 through solid–solid phase transformation, utilizing FeS2 and CoS2 nano-octahedron single crystals as the parent crystals. PSC Fe2O3 and Co3O4 have large specific surface areas to provide enough electrocatalytic active sites while retaining the intrinsic properties of porous single crystals. Meanwhile, we quantitatively engineered Pt clusters/metal oxide interfaces on the surfaces of PSC Fe2O3 and Co3O4 to enhance the electrocatalytic performance. The PSC Pt/Co3O4 catalyst with lower overpotential (269 mV at 10 mA cm−2) exhibits optimal electrochemical performance in the OER, with no degradation observed within 25 hours. The structural consistency of these porous single crystal oxide catalysts, coupled with the construction of active interfaces, offers advantages in enhancing electrocatalytic activity and durability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, erbium-doped gadolinium oxide rare earth oxide nanoparticles (Gd 2 O 3 :Er 3+ ) with good light absorption capacity from the visible to the infrared region were prepared by polyol method, and then compounded with TiO 2 by hydrothermal method. SEM, TEM, XPS, UV–vis and electrochemical workstation were used to study the morphology, structure, UV–vis light absorption and photoelectrochemical (PEC) properties of Gd 2 O 3 :Er 3+ /TiO 2 . The results showed that the Gd 2 O 3 :Er 3+ spherical nanoparticles with a particle size of about 15 nm were uniformly distributed on the surface of the TiO 2 nanorod array, and the Gd 2 O 3 :Er 3+ /TiO 2 nanocomposites had good light absorption capacity in the infrared region. Furthermore, the photocurrent densities of Gd 2 O 3 /TiO 2 and Gd 2 O 3 :Er 3+ /TiO 2 were 2.08 and 2.75 times higher than those of TiO 2 , respectively, manifesting that the broadening of infrared light absorption can improve the PEC property of TiO 2 . Meanwhile, the DFT calculation results showed that the energy band of Gd 2 O 3 :Er 3+ /TiO 2 was significantly narrower than that of TiO 2 , indicating that Gd 2 O 3 :Er 3+ /TiO 2 had a redshift phenomenon of UV–vis absorption. The calculation results of state density showed that the f orbital of Gd 2 O 3 :Er 3+ intersected with the d orbital of TiO 2 , indicating that there is an electron transfer between Gd 2 O 3 :Er 3+ and TiO 2 .
研究领域:
材料科学
·
光催化
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Yunxiang Zhang,Yu Wang,Chenliang Zhou,Hazem Abdelsalam,Wei Chen,Li Huang,Zhichao Mu,Zhili Chen,Diab Khalafallah,Qinfang Zhang
High photogenerated carrier recombination rate and weak spectral response are the two main factors restricting photocatalytic activities of photocatalysts. In this work, a novel Ag/Bi 24 O 31 Cl 10 heterojunction has been developed by the in-situ photoreduction technique to address the preceding issues. Physicochemical properties of as-synthesized 0.7 wt% Ag/Bi 24 O 31 Cl 10 photocatalysts were investigated in detail. The Ag clusters can be seen as surface plasmon polaritons to light absorption capacity and photothermal effect, which was demonstrated via Raman and UV–Vis diffuse reflectance spectra (UV–Vis DRS). Density functional theory (DFT) calculations show that the additional unoccupied crystal orbital by the silver (Ag) will accelerate the charge separation where some of the excited electrons to the conduction band of Bi 24 O 31 Cl 1 0 will drift to these orbitals which in turn prevent charge recombination. Therefore, Ag metal cluster-decorated Bi 24 O 31 Cl 10 photocatalysts can be identified as electron trappers to boost the spatial separation of the photogenerated carrier, and finally, the CH 4 generation rate and the rhodamine b (RhB) degraded efficiency of Ag/Bi 24 O 31 Cl 10 photocatalysts are enhanced about 1.54 and 5.20 times, respectively. The Ag/Bi 24 O 31 Cl 10 composite photocatalyst retained high photocatalytic activities after four cycles indicating the stability and repeatability of the Ag/Bi 24 O 31 Cl 10 composite. This work aims to provide new insight into modifying ideal semiconductor materials for high photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yongjin Chen,Yuanmin Zhu,Abbas Nasir,Renhong Liang,Ping Liao,Liwen Zhu,Songbai Hu,Shusheng Pan,Shanming Ke,Ren-Kui Zheng,Mao Ye
Piezocatalysis has emerged as a green and efficient technology to address widespread environmental challenges and public health concerns. However, scalable fabrication of high-performance, cost-effective piezocatalysts remains challenging. Herein, we propose a facile strategy utilizing rare-earth element doping to significantly enhance the piezocatalytic performance of BaTiO 3 ceramic powder synthesized via solid-state sintering. The Er-doped BaTiO 3 demonstrates exceptional RhB dye degradation with a rate constant of 257 × 10 −3 min −1 , representing a 4.9-fold improvement over pristine BaTiO 3 and surpassing reported lead-free perovskite piezocatalysts. Remarkably, even at ultralow piezocatalyst loading (2.5 mg 1 mol% Er-BaTiO 3 in 5 mg/L RhB), the system maintains a high reaction rate constant of 241 × 10 −3 min −1 . This performance enhancement originates from Er 3+ -induced polarization intensification, oxygen vacancy proliferation, and charge carrier density elevation. Our work establishes an effective strategy for developing high-efficiency piezocatalytic materials with promising applications in wastewater remediation.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lifen Wang,Yonggang Liu,Yinjun Lin,Xueying Zhang,Yonghao Yu,Ruiqin Zhang
Enhancing the effective contact between heterogeneous interfaces and accelerating photo-generated charge separation is the focus of current photocatalysis research. Herein, a novel Z-scheme Cu 2 (OH) 3 F/Bi 2 WO 6 (CFO/BWO) heterojunctions with intimate hetero-surface contact were successfully synthesized via electronic coupling of the surface hydrogen bonds. The optimal proportion of 25%CFO/BWO displayed outstanding photocatalytic performance among the removal of tetracycline hydrochloride (TC-HCl). The excellent catalytic effect comes from the construction of the Z-Scheme heterojunction, which accelerates the separation of photogenerated carriers, and the linking of hydrogen bonds between different planes providing more charge transfer channels. Moreover, explored the main active substances in the reaction process and tested the stability of the as-prepared samples, and the charge transfer law and degradation mechanism in the Z-scheme heterojunction are discussed in detail. This work provides a new way to construct heterojunctions with more adequate hetero-surface contact and faster charge transfer capabilities.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yandi Cai,Peng Yang,Qinglong Liu,Kaili Ma,Wenxin Ma,Wang Song,Qiuhui Qian,Fei Gao,Wei Tan,Lin Dong
Sulfation treatment has been widely used to promote the catalytic performance of ceria (CeO 2 ) based catalysts for the selective catalytic reduction of NO by NH 3 (NH 3 -SCR of NO). Praseodymium oxide (PrO x ), another commonly used rare earth material with similar structural properties as CeO 2 , also shows satisfactory redox properties due to the facile redox cycle of Pr 3+ ↔ Pr 4+ . In this work, gas phase sulfation treatment with varied duration was performed on PrO x at 200 °C, and the NH 3 -SCR activity of sulfated PrO x was evaluated. Based on the results of systematic characterizations (e.g., N 2 -physisorption, NH 3 oxidation , NO oxidation, in situ diffuse Fourier transform infrared spectroscopy), it is revealed that the catalytic performance of sulfated PrO x is highly dependent on the sulfation time (or the amount of sulfate species deposited on PrO x ), which has a significant impact on the competitive reaction between NH 3 oxidation and NH 3 -SCR of NO, thus determining the NH 3 -SCR activity of PrO x . This work provides new insight into tuning the interaction between PrO x surface and reactants (NO, NH 3 ) via sulfation treatment, which cam guide the design and application of PrO x based catalysts for NH 3 -SCR of NO in the future.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Ying Wu,Yuelin Wei,Qiyao Guo,Hui Xu,Ling Gu,Feiyue Huang,Dan Luo,Yunfang Huang,Leqing Fan,Jihuai Wu
A series La-doped WO 3 /SrTiO 3 heterojunctions photocatalyst were successfully prepared using solvothermal method . The as-fabricated heterostructures composite included La-doped WO 3 fluff spheres tightly grew on the surface of SrTiO 3 cubic particles. The crystallanity, structural, morphological and optical features of the catalysts were characterized using several techniques including XRD , XPS , SEM, TEM UV−vis and HRTEM. The photocatalytic activity of the heterojunction was evaluated by the photocatalytic degradation of methyl orange (MO) under visible-light irradiation. The influence of La doping and SrTiO 3 molar ratio on heterojunctions photocatalysts was investigated. Among the as-prepared photocatalysts, the LWS50 sample exhibited the highest photocatalytic activity , almost 100% MO were completely decomposed within 75 min under visible light irradiation (λ > 420 nm). Compared with the pure WO 3 and SrTiO 3 , the enhancement of photocatalytic activity was mainly attributed to the three-dimensional hierarchical structure and the effectively transfer and separation of photogenerated electron–hole pairs in La doped WO 3 and SrTiO 3 heterojunctions
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yang Li,Xinyan Xiao,Zhihao Ye
A novel ellipsoidal (t-s) BiVO 4 modified g-C 3 N 4 composite photocatalyst was fabricated via a facile two-step synthesis strategy in the assistance of ultrasonic and magnetic stirring method. In this typical process, (t-s) BiVO 4 was prepared by using a modified polyol method, and the coupling process of (t-s) BiVO 4 with g-C 3 N 4 was executed after ultrasonic treatment in the ethanol system. The photocatalytic activity of the as-obtained composites was evaluated by monitoring the degradation process of Rhodamine B (RhB) under the simulated sunlight irradiation. The results revealed that the highest degradation efficiency can reach up to 97.7% in 120 min when the mass ratio of (t-s) BiVO 4 and g-C 3 N 4 came to be 1:16. And the optimum degradation rate was 0.03088 min −1 , which was 4.6 and 47.5 times faster than that of the bare g-C 3 N 4 and (t-s) BiVO 4 , respectively. The trapping experiments were conducted to verify that h + and secondary·O 2 - radicals were the main active species in the photocatalytic process. The enhanced photocatalytic performance can be attributed to the synergetic effect of the heterojunction formed at the interface of g-C 3 N 4 and (t-s) BiVO 4 , which resulted in the enlarged optical absorption range and improved separation ability of photo-induced carriers.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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