CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Peng Huan,Jiang Mengmeng,Ye Jinfeng,Wang Lei,Ding Shunmin,Cehn Chao
Oxygen vacancy in ceria is a crucial regulation factor for modifying materials. The reduced oxygen vacancy will undergo rapid recombination and deactivation due to the imbalance perturbation of active oxygen species, thereby restricting their larger-scale application. In this work, we proposed a strategy to stabilize oxygen vacancy in four black CeO x (Si) (0< x <2) by quartz sand doping reduction. The formation of a Ce-O v -Si (O v denoted as oxygen vacancy) interface, instrumental in constructing stable oxygen vacancies, is facilitated by rich hydroxyl groups. Characterizations of CeO x (Si) reveal that the heterogeneous hydrogen at the Ce-O-Si interface encourages the lattice distortion in ceria to obtain stable oxygen vacancies. Guided by the reusable feature, quartz sand doping reduction is a facile and feasible strategy to stabilize the oxygen vacancy of black CeO x for advanced materials on a large scale.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jinxin Xie,Xukai Li,Weirui Chen,Xianglin Sun,Kexin Chen,Yiming Tang,Laisheng Li
The mesoporous core-shell CeO x @SiO 2 was synthesized and characterized by XRD, pyridine-FTIR, BET, SEM, TEM and XPS. CeO x @SiO 2 was the hollow nanosphere with high surface area of 1291.4 m 2 g −1 , which benefited for mass transfer of reactants. CeO x @SiO 2 exhibited the excellent catalytic activity for oxidizing oxalic acid (OA) in O 3 /H 2 O 2 /CeO x @SiO 2 . The greatest OA mineralization (91.2%) was achieved at pH = 3.2 in O 3 /H 2 O 2 /CeO x @SiO 2 , which was 5.5 times higher than that in peroxone (O 3 /H 2 O 2 , 15.9%). Influence of pH, HSO 3 − , PO 4 3− and detection of ozone and H 2 O 2 concentration were conducted to explore the mechanism. The interface reaction played vital role for OA removal in O 3 /H 2 O 2 /CeO x @SiO 2 process. Protonated surface hydroxyl groups (Ce-OH 2 + ) was the active sites, where OA, O 3 and H 2 O 2 were chemi-absorbed. The peroxide-like species (≡(Ce(IV)-O 2 H 2 )) formed by the complex of H 2 O 2 with active sites were the important intermediates, which initiated ozone decomposition into hydroxyl radical (·OH) and led to the high OA mineralization. Moreover, Lewis acid sites and electron transfer effect of Ce(III)/Ce(IV) also accounted for the high catalytic activity of CeO x @SiO 2 . In addition, CeO x @SiO 2 maintained stable structure and catalytic activity in three cycles.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 53
·80399-80410
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IF 5.19
Shu Xinpeng,Bi Huaqi,Wang Jun,Yang Jiaxin,Wang Jue,Liu Guangqing,Su Bensheng
Catalytic ozonation with supported metal oxides is a promising strategy for addressing refractory pollutants in wastewater. In this study, γ-Al 2 O 3 supported MnO x -CeO x catalysts (MC 1 , MC 2 , and MC 3 ) obtained at different calcination temperatures (400 °C, 550 °C, and 700 °C) were applied as effective catalysts for ozonation and explored the feasibility of the treatment of oxytetracycline (OTC) wastewater. Comparatively, the MC 2 possessed the highest molar ratios of Mn 3+ /Mn 4+ (1.60) and Ce 3+ /Ce 4+ (0.96), the largest surface area (273.8 m 2 g −1 ) with a petal-shaped structure, and most abundant surface hydroxyls (3.78 mmol g −1 ). These physicochemical characteristics benefited the surface reaction and resulted in the acceleration of ozone decomposition, electron transfer, and •OH generation, thereby improving the catalyst’s adsorption ability and catalytic activity. The combination with MC 2 increased the OTC and COD removal of the ozonation process from 59.1% and 29.0% to 94.7% and 83.3% in 25 min, respectively. By employing electron paramagnetic resonance (EPR) and radical quenching experiments, it was verified that •OH species generation promoted the mineralization of OTC. The possible degradation pathways of OTC were investigated through mass spectrometry, and the route consisted of dehydration, deamination, and demethylation. Moreover, during a 12-day continuous experiment, MC 2 catalyst exhibited excellent reusability and catalytic stability, with COD removal efficiencies above 80%.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 13
·6321-6332
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IF 6.7
Huimin Wang,Tao Feng,Lincai Wang,Weiju Hao
Development of economical, efficient and durable non-noble metal electrocatalysts for the hydrogen/oxygen evolution reaction (HER/OER) holds great promise, but still faces great challenges. Herein, a strategy of doping metal borides with rare earth metal oxides and introducing silicon carbide (SiC) quantum dots has been explored to develop efficient bifunctional electrocatalysts. A novel electrocatalyst consists of SiC quantum dot-decorated CeOx–NiB supported on nickel foam via a one-step mild electroless plating reaction (denoted as CeOx–NiB/SiC@NF). Notably, the modulated electron density of the CeOx–NiB/SiC@NF electrode significantly boosts the electrochemically active surface area and electron transfer, and optimizes the hydrogen/water absorption free energy, which delivers current densities of 50 mA cm−2 and 10 mA cm−2 at overpotentials of only 131 mV and 234 mV for the HER and the OER, respectively. The target electrode requires only 1.43 V to provide 10 mA cm−2 for overall water splitting in 1.0 M KOH. Moreover, the electrode also exhibits good stability and durability at the industrial-grade current density (0.5–1 A cm−2). This work provides a new idea for the development of efficient and durable non-precious metal catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2019
·Vol. 15
·期 17
·1900289
·
IF 10.856
Hao Dong,Lei Zhang,Lulu Li,Wanyu Deng,Congling Hu,Zhi-Jian Zhao,Jinlong Gong
The electroreduction of CO 2 to CO provides a potential way to solve the environmental problems caused by excess fossil fuel utilization. Loading transition metals on metal oxides is an efficient strategy for CO 2 electroreduction as well as for reducing metal usage. However, it needs a great potential to overcome the energy barrier to increase CO selectivity. This paper describes how 8.7 wt% gold nanoparticles (NPs) loaded on CeO x nanosheets (NSs) with high Ce 3+ concentration effectively decrease the overpotential for CO 2 electroreduction. The 3.6 nm gold NPs on CeO x NSs containing 47.3% Ce 3+ achieve CO faradaic efficiency of 90.1% at −0.5 V in 0.1 m KHCO 3 solution. Furthermore, the CO 2 electroreduction activity shows a strong relationship with the fractions of Ce 3+ on Au-CeO x NSs, which has never been reported. In situ surface-enhanced infrared absorption spectroscopy shows that Au-CeO x NSs with high Ce 3+ concentration promote CO 2 activation and *COOH formation. Theoretical calculations also indicate that the improved performance is attributed to the enhanced *COOH formation on Au-CeO x NSs with high Ce 3+ fraction.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Jinxin Xie,Weirui Chen,Yanfeng Lv,Haoyao Chen,Xukai Li,Laisheng Li
In this work, a hollow mesoporous CeO x @SiO 2 was synthesized and used to promote sulfanilamide (SA) mineralization in ozonation . SA mineralization was promoted to 68.2% by O 3 /CeO x @SiO 2 in 120 min, but only 30.0% in O 3 process. O 3 /CeO x @SiO 2 behaved the better at acidic and alkaline condition than that at neutral condition. CeO x @SiO 2 had the great ability in enhancing O 3 utility rate. Silanol (Si OH) in pore channel of SiO 2 shell was non-reactive with O 3 but could provide transmission way for O 3 to reach the inner CeO x core. Lewis sites, oxygen vacancies and surface hydroxyl groups induced by CeO x favored for the activation of O 3 . The excess electron at oxygen vacancies would be transferred to the absorbed O 3 molecular, which then generated reactive oxygen species (ROS) to mineralize SA. Hydroxyl radicals ( OH) and superoxide radicals ( O 2 − ) were the main ROS, which were recorded by EPR. The interfacial electron transfer process was revealed by LSV and ESI characterizations. SA degradation intermediates were also identified by HPLC-MS and IC, a possible degradation pathway was proposed. Moreover, CeO x @SiO 2 showed a good reusability, no obvious decline of TOC removal was found in four times’ uses. Water matrix would complete ROS with SA, which inhibited the SA removal of both O 3 and O 3 /CeO x @SiO 2 processes, but the better TOC removal efficiency was still obtained by O 3 /CeO x @SiO 2 in actual water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jingyou Yuan,Manoj Pudukudy,Tianding Hu,Yi Liu,Xiaofei Luo,Yunfei Zhi,Hongying Su,Lihong Jiang,Shaoyun Shan
The overuse of antibiotics triggered a serious environmental crisis, stimulating the development of feasible technologies for removing antibiotics from wastewater. Herein, a set of CeO x @C-TiO 2 composites with varying amounts of CeO x from 1% to 15% were synthesized and applied for the photodegradation of tetracycline (TC) for the first time. It was found that the composites exhibited excellent performance for TC removal by degradation and mineralization under visible-light irradiation. The uniform distribution of CeO x nanoparticles in C-TiO 2 permitted the surface contact of particles, enhancing their visible light absorption with a reduced band gap of 2.39 eV and electron-transfer efficiency through the formation of heterojunctions. The amount of CeO x played a predominant role in the photocatalytic properties. The 10% composite exhibited high removal rates of 99.1%, 98.2%, and 83.5% for 10, 20, and 40 mg/L TC, respectively. Characterization experiments proved that Ce mainly existed in its +3 and +4 valence states in the composites. The interchange of these two valence states accelerated the transfer of electrons and promoted the production of superoxide anion radicals and hydroxyl radicals responsible for TC degradation. These findings provide valuable guidelines for exploiting high-performance MOF-derived photocatalysts for the abatement of contaminants.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
O. Song-Il,Jun-Min Yan,Hong-Li Wang,Zhi-Li Wang,Qing Jiang
CeO x -induced amorphization of CoPt nanoparticles (NPs) is achieved by a facile co-reduction method using sodium borohydride (NaBH 4 ) as the reducing agent at room temperature (298 K) under ambient atmosphere. The investigation results indicate that CeO x plays a critical role in transferring the crystalline CoPt nanoalloy into the amorphous one. To our surprise, the resultant Co 0.65 Pt 0.30 (CeO x ) 0.05 NPs exhibit high catalytic kinetic performance with 72.1% hydrogen (H 2 ) selectivity for the H 2 generation from hydrous hydrazine (N 2 H 4 ) within only a few minute at 298 K. Although complete conversion is not achieved, but the initial turnover frequency value of 194.8 h −1 for the present amorphous catalyst is much higher than that of crystalline one. Moreover, such a highly rapid catalyst may greatly encourage the practical application of hydrous N 2 H 4 as a hydrogen storage material.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 15
·17986-17996
·
IF 3.056
Wang Yanhua,Du Yingchao,Yan Jingmin,Wang Yongliang,Yu Bo,Zhang Xiaomeng,Ye Shufeng
Compared with As(V), As(III) is a tricky issue worldwide for its higher toxicity and more difficult to remove in aqueous solution. In present study, a novel CeO x /MnO y nanoparticles anchored layered structural TiO 2 pillared montmorillonite (TiO 2 -Mt-Ce-Mn) was fabricated and applied as an efficient absorbent for As(III) removal. Under the condition of the initial As(III) concentration = 20 mg/L and adsorbent dose = 0.4 g/L, TiO 2 -Mt-Ce-Mn with a high specific surface area (148.099 m 2 /g) has an outstanding adsorption capacity (46.58 mg/g) for As(III) at pH 4.2, and the effect of oxy-anions on adsorption efficiency is slight except for H 2 PO 4 − . Interestingly, the layered structure provides sufficient attachment space for CeO x /MnO y nanoparticles, while CeO x /MnO y nanoparticles in turn endows TiO 2 -Mt a high redox potential, which further facilitates the oxidation of As(III), and this significantly reduces the toxicity of wastewater. The adsorption mechanism includes the oxidation of As(III) to As(V) by both CeO x /MnO y nanoparticles and TiO 2 and effective adsorption of the residual As(III) and the formed As(V) subsequently. In addition, the adsorption efficiency of TiO 2 -Mt-Ce-Mn can still maintain 79.6% after five cycles through a facile regeneration method. Thus, the nanocomposite with low-cost synthesis process, high adsorption capacity, and regenerability is a promising candidate for As(III) treatment of wastewater.
研究领域:
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
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2020
·Vol. 93
·期 10
·1553-1560
·
IF 0.69
Wang Keyan,Du Liyong,Liu Xinfang,Ding Yuqiang
Abstract A cerium compound with asymmetric amidinate ligands [Ce( i PrNC(Me)N t Bu) 3 ] has been reported and characterized in this paper. The compound showed good volatility and thermal stability, which were evaluated by TGA (thermogravimetric analysis). Corresponding results indicated the great potential of this compound for the chemical vapor deposition (CVD) process. Therefore, CeO x film and particle (loaded on TiO 2 ) deposition were conducted by CVD using Ce( i PrNC(Me)N t Bu) 3 and O 2 as precursors. Meanwhile, the photocatalytic activity of the CVD CeO x –TiO 2 composite was evaluated by degrading methylene blue solution under the irradiation of ultraviolet light (365 nm).
研究领域:
材料科学
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化学工程
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Feng-Di Tu,Zi-Yun Wu,Pan Guo,Li-Xiao Shen,Zi-Yu Zhang,Yun-Kun Dai,Miao Ma,Jing Liu,Bin Xu,Yun-Long Zhang,Lei Zhao,Zhen-Bo Wang
Platinum group metal (PGM)-free catalysts represented by nitrogen and iron co-doped carbon (Fe-N-C) catalysts are desirable and critical for metal-air batteries , but challenges still exist in performance and stability. Here, cerium oxides (CeO x ) are incorporated into a two-dimensional Fe-N-C catalyst (FeNC-Ce-950) via a host-guest strategy. The Ce 4+ /Ce 3+ redox system creates a large number of oxygen vacancies for rapid O 2 adsorption to accelerate the kinetics of oxygen reduction reaction (ORR). Consequently, the as-synthesized FeNC-Ce-950 catalyst exhibits a half-wave potential ( E 1/2 ) of 0.921 V and negligible decay (<2 mV for Δ E 1/2 ) after 5,000 accelerated durability cycles, significantly outperforming most of ORR catalysts reported in recent years and precious metal counterparts. When applied in a zinc-air battery, it demonstrates a peak power density of 175 mW cm −2 and a specific capacity of 757 mAh g Zn −1 . This study also provides a reference for the exploration of Fe-N-C catalysts decorated with variable valence metal oxides .
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Tingting Hou,Nengchao Luo,Yi-Tao Cui,Jianmin Lu,Lei Li,Katherine E. MacArthur,Marc Heggen,Ruotian Chen,Fengtao Fan,Wenming Tian,Shengye Jin,Feng Wang
Engineering the electronic properties of heterogeneous catalysts is an important strategy to enhance their activity towards CO 2 reduction. Herein, we prepared partially sulfurized cerium oxide (CeO x -S) nanoclusters with the size less than 2 nm on the surface of ZnIn 2 S 4 layers. Surface electronic properties of CeO x -S nanoclusters are facilely modulated by cerium coordination to sulfur, inducing the emergence of abundant Ce 3+ and oxygen vacancies. For the photoreduction of CO 2 , CeO x -S/ZnIn 2 S 4 hybrid catalysts exhibited a CO productivity of 1.8 mmol g −1 with a rate of 0.18 mmol g −1 h −1 , which was twice as higher as that of ZnIn 2 S 4 catalyst using triethylamine as a sacrificial electron donor. Further mechanistic studies reveal that the photogenerated electrons are trapped by oxygen vacancies on CeO x -S/ZnIn 2 S 4 catalysts and subsequently transfer to CO 2 , benefiting the activation of CO 2 . Moreover, the extremely high selectivity of CO is derived from the weak adsorption of CO on the surface of CeO x -S/ZnIn 2 S 4 catalysts.
研究领域:
材料科学
·
催化化学
✓ 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）