Small
·
2023
·Vol. 19
·期 40
·2303099
·
IF 13.3
Zi Yang,Deguang Ji,Zhi Li,Zidong He,Yang Hu,Jie Yin,Yichao Hou,Pinxian Xi,Chun-Hua Yan
Copper-based electrocatalysts effectively produce multicarbon (C 2+ ) compounds during the electrochemical CO 2 reduction (CO 2 RR). However, big challenges still remain because of the chemically unstable active sites. Here, cerium is used as a self-sacrificing agent to stabilize the Cu + of CuS, due to the facile Ce 3+ /Ce 4+ redox. CeO 2 -modified CuS nanoplates achieve high ethanol selectivity, with FE up to 54% and FE C2+ ≈ 75% in a flow cell. Moreover, in situ Raman spectroscopy and in situ Fourier-transform infrared spectroscopy indicate that the stable Cu + species promote C C coupling step under CO 2 RR. Density functional theory calculations further reveal that the stronger * CO adsorption and lower C C coupling energy, which is conducive to the selective generation of ethanol products. This work provides a facile strategy to convert CO 2 into ethanol by retaining Cu + species.
研究领域:
材料科学
·
催化化学
·
能源转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Xin Wang,Baofang Jin,Ruixue Feng,Wei Liu,Duan Weng,Xiaodong Wu,Shuang Liu
In this work, tandem oxygen delivery systems were built by coating cube-like Co 3 O 4 with Ag/CeO 2 , which exhibited high soot oxidation activity that overwhelmed the Fe 2 O 3 -based catalysts. The results of TPR and activity tests indicated that a large amount of Co 3 O 4 lattice oxygen could be transferred into O x − with the assistance of Ag/CeO 2 . These active oxygen species accelerated the oxidation of soot and NO at low temperature. Furthermore, the Co 3 O 4 -CeO 2 synergy facilitated Co 3+ → Co 2+ transformation during reactions, resulting in boosted NO conversion and thereby NO 2 -assisted soot combustion at mild and high temperatures. Given the Ag/Co 3 O 4 @CeO 2 -type catalysts were low-cost, hydrothermally stable and could be fabricated via co-precipitation methods easily, they were highly promising for application in both gasoline and diesel particulate filters.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Fuyuan Qi,Weiping Yang,Lan-Lan Lou,Shuangxi Liu,Kai Yu
Oxygen vacancies play an important role in the oxidation of biomass-derived alcohols and aldehydes using ceria-based catalysts. In this study, a highly oxygen vacancy-defective Pt/H-CeO 2 catalyst was synthesized by a straightforward strategy that involved the control of the addition of ascorbic acid and nitric acid. The addition of ascorbic acid, which acted as a pore-forming agent, promoted the hydrolysis, crystallization, and subsequent growth of Ce precursor salt, resulting in the synthesis of H-CeO 2 with abundant oxygen vacancy defects and a porous thin sheet-like morphology. However, the addition of nitric acid significantly inhibited the generation of oxygen vacancy defects. The obtained H-CeO 2 exhibited significantly increased oxygen vacancy content, active oxygen species, and specific surface area compared with CeO 2 with lower oxygen vacancy defects (L-CeO 2 ). These remarkable features led to enhanced catalytic activity of Pt/H-CeO 2 for the oxidation of 5-hydroxymethylfurfural (HMF) compared with Pt/L-CeO 2 . This can be mainly attributed to the enhanced adsorption and activation of O 2 molecules by abundant oxygen vacancies, allowing more active oxygen species to participate in the dehydrogenation of HMF. This work provides an example of oxygen defect engineering for ceria-based catalysts to boost the catalytic selective oxidation performance.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jin Song,Fenglong Wu,Yulun Lu,Xinyan Zhang
Doping as a common mean to generate defects to boost the catalytic performance of metal oxide semiconductor-based materials has aroused great interest. However, doping usually requires high temperatures and is time consuming. Herein, we report a facile strategy for the preparation of F doped CeO 2 (F–CeO 2 ) with assistance of the electrostatic attraction between F − and CeO 2 with oxygen vacancies at room temperature , then F–CeO 2 acts as superior support of metal Co nanoparticles (NPs) for efficient hydrolysis of NH 3 BH 3 under light irradiation . The activity of Co/F–CeO 2 is significantly enhanced and Co/F–CeO 2 -0.6 exhibited highest catalytic activity with TOF value 92.8 min −1 which increases 47% compared with Co/CeO 2 . Experimental and characterization results show the enhanced performance attributes to high efficiency photogenerated carrier separation and boosting adsorption capacity of H 2 O and NH 3 BH 3 over Co/F–CeO 2 due to F doped into CeO 2 crystallites . Furthermore, theory calculations further confirm that the band gap of F–CeO 2 becomes smaller and F–CeO 2 is more favorable the adsorption for H 2 O and NH 3 BH 3 than pure CeO 2 . This work offers a facile and time efficiency strategy to realize controllable element doped in metal oxide under ambient, and gives deep insights into the structure–activity relationship of catalyst between defect engineering and photocatalytic performance.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Yuting Zhuang,Mengqi Jian,Huiqi Yan,Xin Lv,Yue Zhang
Selenium is a nutritionally essential trace element for human health, but efficient or excessive intake both causes physiological diseases. Here, we propose that selenium as a brightening agent significantly increase the peroxidase (POD)-like activity of MXene@CeO 2 , which CeO 2 nanoparticles in-situ grow on MXene as the sensing platform. Based on the selenium-stimulated POD-like activity of MXene@CeO 2 , a simple, low-cost, and reliable colorimetric method is constructed for quantitative analysis of selenium. The great advantage of MXene@CeO 2 platform selecting selenium as brightening agent exhibits good selectivity for other 23 interfering ions, allowing the discrimination of selenium in practical samples rapidly and precisely even at 3.5 nM. Moreover, MXene@CeO 2 platform selectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) instead of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium (ABTS) under the same condition. This study not only offers a utility sensing platform for quick detection of selenium but also opens an avenue for the rational design of element sensors for point-of-care application.
研究领域:
生物化学
·
医学检测
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2022
·Vol. 65
·期 5
·877-884
·
IF 10.138
Li Zhenyu,Li Jiefei,Zheng Zexuan,Jiang Kunhong,Zheng Tianrun,Wang Dongmin,Wei Hang,Shi Zhiming,Li Xiaotian,Chu Haibin
In the field of noble metal-catalyzed alcohol electro-oxidation reaction (AOR), huge attention is paid on the composition, size, facet, and structure of the metals, while the support engineering should also be emphasized. CeO 2 has been widely used as an unique support in AOR, primarily due to its abundant oxygen vacancies (O v ). Herein, we report CeO 2 · x H 2 O nanoparticles with both massive hydroxyl groups (OH) and O v remarkably enhance the catalytic activity and stability of Pd toward ethanol oxidation reaction (EOR). The CO striping experiments and density functional theory (DFT) calculations suggest that OH and O v on CeO 2 · x H 2 O surface bring about a large downshift of Pd d-band center and a significant weakening of CO absorption on Pd. Moreover, OH and O v also play synergic roles in the removal of toxic intermediates. Consequently, the important roles of OH and O v of CeO 2 · x H 2 O are confirmed in Pd-catalyzed EOR. The facile CeO 2 · x H 2 O-enhanced strategy can contribute to the catalyst design for other energy conversion reactions.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Ziliang Yuan,Xun Li,Guanghui Wang,Zhihua Zhu,Yuhe Liao,Zehui Zhang,Bing Liu
The selective hydrogenation of N -heteroarenes into N -heterocycles is a highly important organic transformation in fine chemical industry, as N -heterocycles are moieties in a variety of pharmaceutical and bioactive compounds. Here, we report highly efficient mesoporous CeO 2 supported Ni catalysts prepared by the incipient wet impregnation and following high-temperature reduction for the selective hydrogenation of N -heteroarenes. The experiments indicated that the synergistic effect between CeO 2 and Ni nanoparticles was responsible to the superior catalytic performance. Various kinds of N -heterocycles were obtained at 120 °C with yields of 86 ∼ >99%, demonstrating the versatility of the developed method. This work is valuable for guiding the design and manipulation of low metal loading, cost-effective and robust hydrogenation catalysts.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2023
·Vol. 95
·期 5
·e10874
·
IF 3.1
Kai Su,Lin-xiao Li,Zhuo Zeng,Xue Yang,Qin Wang,Rong Cao,Cheng Yang,Han Zhang,Jun-min Chen,Wen-ya Tang,Xin Lin
La 2 O 3 and CeO 2 , as main rare earth oxides, with unique physical and chemical properties have been widely used in catalyst and grinding industry. In this study, the effects of La 2 O 3 and CeO 2 on the anaerobic process were investigated. The biological methane production tests showed that 0–0.05 g/L La 2 O 3 and 0–0.05 g/L CeO 2 enhanced anaerobic methanogenesis process. The result showed maximum specific methanogenic rates of La 2 O 3 and CeO 2 were 56.26 mL/(h·gVSS) and 49.43 mL/(h·gVSS) and, compared with the control, increased 4% and 3%, respectively. La 2 O 3 significantly reduced the accumulation of volatile fatty acids (VFAs), whereas CeO 2 had no similar effect. Dissolution experiments demonstrated that the content of extracellular La in the anaerobic granular sludge reached 404 μg-La/g volatile suspended solid (VSS), which was 134 times higher than that of extracellular Ce (3 μg-Ce/gVSS). The content of intracellular La reached 206 μg-La/gVSS, which was 19 times higher than that of intracellular Ce (11 μg-Ce/gVSS). The different stimulation between La 3+ and Ce 3+ could be attributed to the different dissolution of La 2 O 3 and CeO 2 . The result of this work is helpful to optimize anaerobic processes and to develop novel additives. Practitioner Points Novel anaerobic additives were developed. La2O3 and CeO2 in 0–0.05 g/L enhanced organics degradation and methane production. The addition of La2O3 significantly reduced the accumulation of volatile fatty acids. The solubilization of La2O3 was stronger than CeO2. The promoting effects of low concentrations of La2O3 and CeO2 were derived from dissolved La and Ce.
研究领域:
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Zhen-Hong He,Yong-Chang Sun,Yuan-Yuan Wei,Kuan Wang,Weitao Wang,Zhuo Chen,Zhong-Yu Wang,Yue Tian,Zhao-Tie Liu
The reaction of methanol and CO 2 is an ideal route for the utilization of CO 2 resources and the synthesis of dimethyl carbonate (DMC), which is an important fuel and fuel-additive. In this work, we developed a catalyst of CeO 2 nanoparticles (CeO 2 NPs) loaded on Co 3 O 4 nanosheets (Co 3 O 4 NSs) with the Ce/Co molar ratio of 3/7 (Ce 3 -NPs/Co 7 -NSs) which could efficiently catalyze the reaction. The formation activity and the yield of DMC reached 16.8 mmol·g cat -1 ·h −1 and 47.2 % (based on methanol), surpassing most reported catalysts, especially at a relatively low temperature of 120 ℃. Characterization results indicated that the Co 3 O 4 NSs could enhance the amounts of oxygen vacancies and CO 2 adsorption but reduce methanol adsorption. The adsorption equilibrium between methanol and CO 2 is crucial for the titled reaction, and the in-situ IR spectra confirmed that the catalyst could simultaneously activate CO 2 and methanol and the reaction involves a Langmuir-Hinshelwood (LH) mechanism. The present strategy for constructing a catalyst of CeO 2 nanoparticles loaded on Co 3 O 4 nanosheets provides an efficient catalyst for the DMC synthesis from CO 2 and methanol and offers an important reference in building other catalysts with adjustable adsorption capacities of CO 2 and methanol.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 9
·095021
·
IF 2.352
Xiaomin Huo,Honglie Shen,Xia Hu,Zhangchen Hou,Jaffer Saddique
A novel nanomaterial formed by a Cu2ZnSnS4 (CZTS)/CeO2 heterojunction with excellent electrochemical sensing for ammonia nitrogen was prepared by a microwave irradiation method combined with a hydrothermal method. The properties of the CZTS/CeO2 heterojunction were investigated by a series of characterizations such as Raman spectra, x-ray diffraction, scanning electron microscopy, thermogravimetric analysis, specific surface area (SSA), temperature-programmed desorption of ammonia and UV–vis spectroscopy. Nickel foam was used as a conductive frame electrode in order to enhance the sensitivity of the sensor along with the electrical conductivity, permeability and SSA. It is revealed by electrochemical measurements that the ammonia nitrogen oxidation reaction occurring in the sensing electrode of the CZTS/CeO2 heterojunction demonstrated regulation of Ip (mA) = 6.4 × 10−3C (mM)+ 0.1527 (R2= 0.9987) in a wide concentration range of 0–380.0 mM with a low detection of 6.0 μM according to the signal-to-noise ratio (S/N= 2). The CZTS/CeO2 heterojunction is expected to become a new candidate semiconductor nanomaterial for the electrochemical detection of ammonia nitrogen in an aqueous solution.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yibin Bu,Yafeng Chen,Guiming Jiang,Xinmei Hou,Shun Li,Zuotai Zhang
To design an efficient catalyst for HCHO oxidation, it requires good understanding of the correlation between structural properties of catalyst and the reaction mechanism. We investigated performance of commercial CeO 2 (CeO 2 -C) and nanorod CeO 2 (CeO 2 -R) and the corresponding Au/CeO 2 catalysts in HCHO oxidation. Reactivity tests showed that Au/CeO 2 -R is highly efficient and stable in HCHO oxidation at room temperature, which is attributed to the highly active Au-CeO 2 -R interface. The strong interaction between Au and CeO 2 -R greatly promotes the creation of oxygen vacancies and Au 3+ near the interface, which promotes the formation of formate. The conversion of formate can follow both a decomposition and a direct oxidation pathway, which is remarkably enhanced by the coexistence of Au 3+ and oxygen vacancies. In addition, formate accumulation and Au particles aggregation led to deactivation. The presence of humidity promotes the oxidation of formate, which improves the reactivity and stability of Au/CeO 2 in HCHO oxidation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Yangyang Ren,Beibei Li,Guichao Zhang,Zunming Lu,Lanlan Li,Xiaojing Yang,Xinghua Zhang,Xiaofei Yu
Improvement in the durable and active low-Pt nanocatalysts for oxygen reduction reaction (ORR) is the essential target for clean energy. Herein, an efficient CeO 2 supported PtCu alloy catalyst (PtCu/CeO 2 -C) for ORR in acid media is developed. The CeO 2 support can effectively anchor the PtCu particles and inhibit their migration during the long-life cycling, which is beneficial to the catalytic performance. According to the electrochemical experiments, the specific and mass activities of PtCu/CeO 2 -C are 1.09 mA cm −2 and 0.49 A mg Pt −1 at 0.9 V, which are 9.9 and 6.1 times as large as that of Pt/C, demonstrating its outstanding ORR activities in acid media. Moreover, the theoretical studies confirm that oxygen vacancies (V O ) as Lewis acid sites can facilitate the adsorption and dissociation of O 2 , regulate the electronic structure of Pt, and thus endow PtCu/CeO 2 -C with an efficient 4-electron ORR pathway. The results suggest that the rational design of supported Pt-based catalysts is of great significance for efficient ORR reaction.
研究领域:
材料科学
·
电化学
✓ 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）