INORGANIC CHEMISTRY
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2025
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IF 4.7
Xueli Mei,Xueyang Zhao,Hongtao Xie,Nemanja Gavrilov,Qin Geng,Qin Li,Huawei Zhuo,Yali Cao,Yizhao Li,Fan Dong
The electrocatalytic two-electron oxygen reduction reaction (2e-ORR) represents one of the most prospective avenues for the in situ synthesis of hydrogen peroxide (H2O2). However, the four-electron competition reaction constrains the efficiency of H2O2 synthesis. Therefore, there is an urgent need to develop superior catalysts to facilitate the H2O2 synthesis. In this study, graphite-phase carbon nitride and cerium dioxide composites (g-C3N4/CeO2) with varying CeO2 loadings were prepared with favorable 2e-ORR electrocatalysts. The optimized composite, containing 20 wt % CeO2 (g-C3N4/CeO2-20%) exhibited the highest Faradaic efficiency (FE) of 97% and notable H2O2 yielding of 9.84 mol gcat.–1 h–1 at the potential of 0.3 V (vs RHE) in a 0.1 M KOH electrolyte. Density functional theory calculations revealed that the improvement of the selectivity and yield of H2O2 for the composites were attributed to the charge transfer between g-C3N4 and CeO2, which causes the active site C atom donating electrons to form C+, thereby enhancing the adsorption and desorption of *OOH intermediates. Additionally, the g-C3N4/CeO2-20% composite exhibits excellent 2e-ORR performance in neutral and acidic electrolytes and demonstrates superior capability in electro-Fenton degradation of organic pollutants. This study not only provides new insights into the electrocatalytic mechanism of g-C3N4/CeO2 composites but also demonstrates an effective method for designing 2e-ORR catalysts.
研究领域:
材料科学
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电化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2024
·Vol. 23
·期 9
·1659-1672
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IF 2.7
Zhang Lihua,Dong Guowen,Liu Xiaomin,Niu Yu,Gao Wei,Yang Qiong,Li Zaixing
The catalysts with three-dimensional porous (3DP) CeO 2 , LaFeO 3 and SrTiO 3 are synthesized by sol–gel method and chemical precipitation method. The resulting multi-component 3DP CeO 2 /LaFeO 3 /SrTiO 3 composite material featured a high specific surface area (26.08 m 2 /g), which can provide more surface active sites to improve adsorption capacity and catalytic performance. The photocatalytic, Fenton-like, photo-Fenton-like performance of the catalyst are studied on decolorization of RhB under UV irradiation, respectively. 3DP CeO 2 /LaFeO 3 /SrTiO 3 exhibits high catalytic performance. Compared with photocatalytic or Fenton-like performance, 3DP CeO 2 /LaFeO 3 /SrTiO 3 catalyst exhibits higher photo-Fenton-like performance, facilitating efficient decolorization of the rhodamine B. Moreover, the initial reaction rate on decolorization of RhB with 3DP CeO 2 /LaFeO 3 /SrTiO 3 is 10.55, 5.52, 3.67 and 1.51 times higher than that with SrTiO 3 , LaFeO 3 , 3DP CeO 2 and 3DP CeO 2 /LaFeO 3 , respectively. Meanwhile, 3DP LaFeO 3 /CeO 2 /SrTiO 3 has a wider pH usage range in the synergistic reaction. Finally, a catalytic mechanism for the decolorization of rhodamine B is proposed. The continuous cycling of Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ and the production of active substances are achieved under the photo-Fenton-like effect of the catalyst. Graphical abstract
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Wang Hui,Cui Guoqing,Lu Hao,Li Zeyang,Wang Lei,Meng Hao,Li Jiong,Yan Hong,Yang Yusen,Wei Min
The dry reforming of methane provides an attractive route to convert greenhouse gases (CH 4 and CO 2 ) into valuable syngas, so as to resolve the carbon cycle and environmental issues. However, the development of high-performance catalysts remains a huge challenge. Herein, we report a 0.6% Ir/CeO 2− x catalyst with a metal-support interface structure which exhibits high CH 4 (~72%) and CO 2 (~82%) conversion and a CH 4 reaction rate of ~973 μmol CH4 g cat −1 s −1 which is stable over 100 h at 700 °C. The performance of the catalyst is close to the state-of-the-art in this area of research. A combination of in situ spectroscopic characterization and theoretical calculations highlight the importance of the interfacial structure as an intrinsic active center to facilitate the CH 4 dissociation (the rate-determining step) and the CH 2 * oxidation to CH 2 O* without coke formation, which accounts for the long-term stability. The catalyst in this work has a potential application prospect in the field of high-value utilization of carbon resources.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2012
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IF 5.625
Ting Bao,Zhongkui Zhao,Yitao Dai,Xiaoli Lin,Ronghua Jin,Guiru Wang,Turghun Muhammad
CO preferential oxidation (PROX) reactions were performed over the supported Co 3 O 4 -CeO 2 catalysts on modified activated carbon (AC) for eliminating the trace CO from H 2 -rich gases. The effects of support modification by H 2 O 2 oxidation treatment , catalyst calcination temperature, Ce/Co atomic ratio ( n Ce/Co ), Co 3 O 4 -CeO 2 loading and reaction parameters on catalytic properties of the Co 3 O 4 -CeO 2 /AC catalysts were investigated. Various characterization techniques like scanning electron microscopy (SEM), X-ray diffraction (XRD) and H 2 temperature-programmed reduction (H 2 -TPR) were employed to reveal the relationship between catalysts nature and catalytic performance. Results illustrate that the supported Co 3 O 4 -CeO 2 catalyst on modified AC exhibits excellent catalytic properties, which highly depends on dispersity and reducibility of Co 3 O 4 affected by the time of support treatment ( t p ), calcination temperature, n Ce/Co and loading. The supported 35 wt% Co 3 O 4 -CeO 2 catalyst (1:8 of n Ce/Co ) on the modified AC with H 2 O 2 oxidation treatment for 6 h demonstrates the best catalytic properties and the almost complete CO transformation takes place in a wide temperature range of 125–190 °C. Moreover, it is also found that the developed catalyst exhibits an outstanding catalytic stability, and 100% CO conversion can be maintained as the time on stream evolutes up to 1800 min even in the presence of CO 2 and H 2 O in the feed. The optimized Co 3 O 4 -CeO 2 /AC may be a robust and promising catalyst for eliminating trace CO from H 2 -rich gases.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
Journal of Central South University
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2021
·Vol. 28
·期 4
·1233-1243
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IF 1.716
Rao Wei-dong,Liu Yao,Cheng Li-jing,Liu Shao-jun
Combining sintering additive with field assisted sintering, stereolithographical dense Si 3 N 4 ceramics was successfully fabricated. Owing to a large amount of polymer during the stereolithography, the green parts have the characteristics of low powder loading and high porosity. Adjusting the process parameters such as sintering temperature and soaking time can effectively improve the density of the specimens. The stress exponent n of all specimens is in a range of 1 and 2, which is derived from a modified sintering kinetics model. The apparent activation energy Q d of stereolithographic Si 3 N 4 ceramics sintered with applied pressures of 30 MPa, 40 MPa, and 50 MPa is 384.75, 276.61 and 193.95 kJ/mol, respectively, suggesting that the densification dynamic process is strengthened by raising applied pressure. The grain boundary slipping plays a dominating role in the densification of stereolithographic Si 3 N 4 ceramics. The Vickers hardness and fracture toughness of stereolithographic Si 3 N 4 ceramics are HV10/10 (1347.9±2.4) and (6.57±0.07) MPa·m 1/2 , respectively.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2019
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IF 2.781
Baosong Li,Weiwei Zhang,Dandan Li,Jiajia Wang
To enhance the performance of nickel-tungsten (Ni W) matrix, Ni W/ZrO 2 CeO 2 nanocrystalline films have been fabricated by electrodeposition in the presence of zirconia (ZrO 2 ) and ceria (CeO 2 ) nanoparticles . The influences of process parameters on microstructural, surface properties and corrosion resistance of the nanocrystalline films were examined. Studies indicated that the fabricated films are dense, homogeneous and without cracks, comprising 23.7–28.7 wt% W, 3.9–4.9 wt% ZrO 2 and 0.45–0.68 wt% CeO 2 . The film prepared at average current density ( I av ) of 6 A dm −2 , duty cycle ( r ) of 70% contains the highest content of ZrO 2 , CeO 2 nanoparticles with the finer structure. The average roughness ( R a ) is 79.1 nm for film formed at 2 A dm −2 . The growth rate of the film is about 0.48–0.53 μm/min at I av = 4 A dm −2 and r = 50%. The hardness first increases and then decreases with the maximum value at r = 70%, I av = 6 A dm −2 and deposition time ( t ) of 40 min, respectively. Energy disperse spectroscopy (EDS) mapping, transmission electron microscope (TEM) and cross-sectional images illustrated that the ZrO 2 and CeO 2 particles had been homogeneously incorporated in the film. The electrochemical measurements illustrate that the optimal corrosion resistance of Ni W/ZrO 2 CeO 2 film could be obtained at r = 70%, I av = 6 A dm −2 and t = 40 min. The incorporation of ZrO 2 CeO 2 in Ni W film would enhance the anti-corrosion properties and hardness. Ni W/ZrO 2 CeO 2 film owns superior hardness and excellent anti-corrosion properties, showing a broad application prospect in harsh environment.
研究领域:
材料科学
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电化学
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表面工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Nan Wang,Wangqiang Li,Yadong Ren,Jizhou Duan,Xiaofan Zhai,Fang Guan,Lifei Wang,Baorong Hou
Developing environmental and cost-effective antifouling technologies is essential to solve serious biofouling problems. Recently, enzyme mimics and halogenating enzymes have caught progressively attention as valuable tools to combat biofilm formation. In this work, the core-shell structure of CeO 2 @C, as one effective haloperoxidase-like enzyme mimics, was successfully synthesized using the carbon sphere as template through a simple coprecipitation method. Through the UV–vis absorption spectra and kinetic measurements, the CeO 2 @C displays intrinsic haloperoxidase-like activity via catalyzing the bromination of organic signaling compounds. Meanwhile, the prepared CeO 2 @C catalyst process high catalytic stability and recyclability, corresponding to a well catalytic performance repeatability after refresh of raw substrates (at least 10 times). The antibactrial property of CeO 2 @C as haloperoxidase mimicry is evaluated by immersing titanium plate/CeO 2 @C modified titanium plates into bacterial suspensions with different conditions for 4 h at 37 °C. It can catalyze the oxidation of Br − with H 2 O 2 to the corresponding hypobromous acid (HBrO), which exhibits strong antibacterial activity against Gram-negative ( Escherichia coli ), Gram-positive ( Staphylococcus aureus ) bacteria and typical marine ( Pseudomonas aeruginosa ) bacteria. This study introduces a stable, non-poisonous and inexpensive biomimetic material for antibacterial, antifouling and disinfection applications based on novel sustainable and conservation methods.
研究领域:
生物化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2013
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IF 2.145
Rui-tang Guo,Wen-long Zhen,Wei-guo Pan,Yue Zhou,Jie-nan Hong,Hong-jian Xu,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO 2 –CuO catalyst prepared by citric acid method was investigated for selective catalytic reduction of NO with NH 3 . The activity of the CeO 2 catalyst was enhanced about 8–27% in the temperature range of 125–225 °C at a space velocity of 28,000 h −1 by the addition of Cu. It was found that the state of Cu species had great impact on the SCR performance of CeO 2 –CuO catalyst. Cu 2+ can enhance the low temperature activity of SCR reaction, while CuO would promote NH 3 oxidation before SCR reaction at high temperature, which would cause the decrease of its high temperature SCR activity.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2022
·
IF 2.535
Yaohui Xu,Chi Deng,Changxue Dong,Qin Wang,Nunan Gao
Acid Orange 7 (AO7) is one of the most common azo dyes; however, its strong azo bond makes them difficult to biologically degrade. We sought to degrade AO7 dye using CeO2 as a promising alternative photocatalyst. CeO2 powders were synthesized with alternative monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA) as a precipitant by solvothermal process combined calcination in air. Compared to the oxygen storage capability of Blank-CeO2 (0.186 mmol O2/g), that of MEA-CeO2 synthesized in the presence of MEA as a precipitant increased by 21.0%, while that of DEA-CeO2 and TEA-CeO2 synthesized in the presence of DEA and TEA as precipitants were decreased. Importantly, such MEA-CeO2 exhibited the highest photocatalytic activity than Blank-, DEA-, and TEA-CeO2 in degradation of AO7 under simulated sunlight illumination, and the removal rate of AO7 by MEA-CeO2 could reach 98.3% within 100 min.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Shangchao Xiong,Jianjun Chen,Nan Huang,Tao Yan,Yue Peng,Junhua Li
The degradation of catalyst properties, rather than the deposition of NH 4 Cl, was the main reason for the deactivation of the MnCe low-temperature SCR (selective catalytic reduction) catalyst under HCl atmosphere. Cl ions prefer to be located at the oxygen vacancies around Mn cations on the MnCe surface. The adsorbed Cl ions could further promote the formation of oxygen vacancies. Therefore, the active Mn sites on the surface of MnCe would be quickly covered by Cl ions when HCl was present and thus promote the formation of Brønsted acid sites. However, the ionic NH 4 + adsorbed on the Brønsted acid sites of MnCe and MnCe − Cl were not fully utilized in the SCR reaction. Meanwhile, the reactivity of the coordinated NH 3 bonded with Lewis acid sites was significantly restrained by HCl due to the significant inhibition of the redox performance. Overall, HCl could obviously restrain the low-temperature SCR activity of MnCe.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2021
·
IF 6.779
Decai Yang,Yachao Xu,Kai Pan,Chuanxin Yu,Jiaxing Wu,Mingxia Li,Fan Yang,Yang Qu,Wei Zhou
Surface oxygen vacancy defects of mesoporous CeO 2 nanosheets assembled microspheres (D-CeO 2 ) are engineered by polymer precipitation, hydrothermal and surface hydrogenation strategies. The resultant D-CeO 2 with a main pore diameter of 9.3 nm has a large specific surface area (~102.3 m 2 /g) and high thermal stability. The mesoporous nanosheets assembled microsphere structure prevents the nanosheets from aggregation, which is beneficial to effective mass transfer and shortens the migration distance of charge carriers. After surface hydrogenation, the photoresponse extends to long wavelength region, combing with the band gap from 2.63 eV reduced to 2.39 eV. Under AM 1.5 G radiation, the photocatalytic degradation rate of tetracycline (TC) can be up to 99.99%, which is three times as high as that of pristine CeO 2 microspheres . The excellent solar-driven photocatalytic performance can be attributed to the efficient surface oxygen vacancy engineering and the mesoporous nanosheets assembled microsphere structure, which narrows the band gap, shortens the migration distance of carriers, promotes the spatial separation of photogenerated electron-hole pairs and favors mass transfer. The strategy provides new insights for fabricating other high-efficient oxide photocatalysts .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Kai Zhang,Cuiping Xu,Xingjian Zhang,Zhiyi Huang,Qixiang Pian,Kunhong Che,Xiaokun Cui,Yueru Hu,Yimin Xuan
The chemical inertness of CO 2 molecules makes their adsorption and activation on a catalyst surface one of the key challenges in recycling CO 2 into chemical fuels. However, the traditional template synthesis and chemical modification strategies used to tackle this problem face severe structural collapse and modifier deactivation issues during the often-needed post-processing procedure. Herein, a CO 2 self-selective hydrothermal growth strategy is proposed for the synthesis of CeO 2 octahedral nanocrystals that participate in strong physicochemical interactions with CO 2 molecules. The intense affinity for CO 2 molecules persists during successive high-temperature treatments required for Ni deposition. This demonstrates the excellent structural heredity of the CO 2 self-selective CeO 2 nanocrystals, which leads to an outstanding photothermal CH 4 productivity exceeding 9 mmol h -1 m cat -2 and an impressive selectivity of >99%. The excellent performance is correlated with the abundant oxygen vacancies and hydroxyl species on the CeO 2 surface, which create many frustrated Lewis-pair active sites, and the strong interaction between Ni and CeO 2 that promotes the dissociation of H 2 molecules and the spillover of H atoms, thereby greatly benefitting the photothermal CO 2 methanation reaction. This self-selective hydrothermal growth strategy represents a new pathway for the development of effective catalysts for targeted chemical reactions.
研究领域:
材料科学
·
催化化学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）