CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·Vol. 30
·期 68
·e202402516
·
IF 3.9
Chaoyang Yang,Junlei Zhang,Weiping Liu,Yao Cheng,Xueyi Yang,Wanglei Wang
Graphical This study investigated the impact of H 2 /CO 2 partial pressure ratios on CO 2 methanation using Ni/CeO 2 . Results show elevated H 2 /CO 2 ratios enhance CO 2 conversion and CH 4 selectivity, achieving complete methanation at 250 °C and 100 % selectivity at 400 °C. In-situ DRIFTS analysis indicates formate pathway dominance at higher ratios, key for CH 4 production and CO 2 mitigation strategies. On the way to carbon neutrality, directly catalyzing atmospheric CO 2 into high-value chemicals might be an effective approach to mitigate the negative impacts of rising airborne CO 2 concentrations. Here, we pioneer the investigation of the influence of the H 2 /CO 2 partial pressure ratio (PPR) on air-level CO 2 methanation. Using Ni/CeO 2 as a case catalyst, increasing H 2 /CO 2 PPR significantly improves low-temperature CO 2 conversion and high-temperature CH 4 selectivity, i. e., from 10 of H 2 /CO 2 PPR on, CO 2 is completely methanized at 250 °C, and nearly 100 % CH 4 selectivity is achieved at 400 °C. 100-hour stability tests demonstrate the practical application potential of Ni/CeO 2 at 250 °C and 400 °C. In-situ DRIFTS reveal that reinforced formate pathway by increasing H 2 /CO 2 PPR is responsible for the high CH 4 yield. In contrast, even though the CO pathway dominated CO 2 conversion on Ni is enhanced by rising H 2 /CO 2 PPR, but at a high reaction temperature, the promoted CO desorption still leads to lower CH 4 selectivity. This work offers deep insights into the direct air-level CO 2 resourceization, contributing to the achievement of airborne CO 2 reductions.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 6
·2775-2781
·
IF 5.503
Lingjie Li,Liu Cao,Qiudong He,Bo Shang,Jinlong Chen,Jinglei Lei,Nianbing Li,Fusheng Pan
To improve the electrocatalytic performance of CuCo hybrid oxides, here we report a novel and facile strategy to simultaneously tailor the morphology and electronic structure of CuCoOx by incorporation of CeO2. The as-synthesized CeO2-CuCoO/NF shows urchin-like morphology that is composed of numerous nanofibers, endowing the surface with superaerophobicity and massive active sites. Density functional theory calculation elucidates the crucial role of CeO2 in boosting the electron transfer and decreasing the free energy of intermediates during water splitting. As expected, CeO2-CuCoO/NF shows attractive bifunctional electrocatalytic activity with overpotentials of 266 and 93 mV at 10 mA cm−2 for oxygen and hydrogen evolution reactions in 1 M KOH, respectively, which are superior to most reported catalysts. A water-splitting electrolyzer consisted of CeO2-CuCoO/NF electrodes as both anode and cathode displays better performance than the noble-metal counterpart IrO2/NF‖Pt/C/NF. The present work undoubtedly sheds new insight on designing advanced bifunctional catalysts for practical water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2020
·
IF 2.838
Zixiang Cui,Jiaojiao Chen,Yongqiang Xue,Junzhen Gan,Xinghui Chen,Huijuan Duan,Rong Zhang,Jiayi Liu,Jie Hao
The surface tension and surface thermodynamic properties play a decisive role in research and applications of nano materials , but they are difficult to be determined, as there is no precise method to measure these properties of nano materials. Herein, we derived the relations between the molar surface thermodynamic functions, surface heat capacity , and particle size. On this basis, a new low-temperature heat capacity method for determining the surface tension and the surface thermodynamic functions of nano materials was proposed. We measured the low temperature heat capacities of nano-CeO 2 and bulk CeO 2 in temperature range from 1.9 K to 300 K at constant pressure by the Physical Property Measurement System (PPMS). The surface tensions and corresponding temperature coefficients of nano-CeO 2 were calculated at different temperatures, and then the surface thermodynamic functions were obtained. The results show that the molar heat capacities of nano-CeO 2 are greater than that of the corresponding bulk CeO 2 in temperature range from 1.9 K to 300 K. The molar surface enthalpy and molar surface entropy of nano-CeO 2 increase with the increase of temperature, while surface tension, temperature coefficient, and molar surface Gibbs energy decrease with the increase of temperature. The proposed low temperature heat capacity method can not only accurately measure surface tension, temperature coefficient, and surface thermodynamic functions of nanoparticles at different temperatures, it also provides a reliable and an accurate experimental method for solving the thermodynamic problems of nanoparticles.
研究领域:
材料科学
·
热力学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 2
·361-372
·
IF 2.372
Liu Yanan,Yang Zhao,Zhang Xinyi,He Yufei,Feng Junting,Li Dianqing
Abstract A series of CeO 2 with the morphology of nanocube (NC), nanopolyhedron (NP) and nanorod (NR) were synthesized by hydrothermal method as substrates to support monometallic Au catalysts. Insight into support morphology-dependent the property of active component and catalytic behavior for the selective hydrogenation of phenylacetylene has been performed. Specifically, nanocube ceria could disperse monometallic Au nanoparticles due to a large amount of low coordinated sites that readily generated the strong interaction for anchoring active metal, whereas the polyhedron and rod-like ceria supported Au nanoparticles possessed large size and wide particle distribution. As expected, well-dispersed and stable Au/CeO 2 nanocube demonstrated 83% of selectivity towards styrene when the conversion of phenylacetylene reached 90%, which was much higher than that of others. Preferable activity was mainly ascribed to small size of Au nanoparticles, which facilitated the adsorption/dissociation of hydrogen considered as the rate-determining step. Enhanced selectivity was due to the electronic effect that caused by strong interaction between Au and cubic CeO 2 , which also contributed to good stability. This work not only provides a facile method for the preparation of highly dispersed and efficient Au/CeO 2 catalysts by modulating the morphology of support, but also offers a novel idea for the fabrication of other highly dispersed supported metal catalysts with enhanced behavior in heterogeneous catalysis. Graphical Abstract
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
Small
·
2024
·
IF 13
Qi-Xuan Ma,Li Xu,Yong Fan,Li Wang,Jia-Ning Xu,Jie Zhao,Xiao-Bo Chen
This article aims to develop CeO 2 nanocontainer-constructed coating with a synergistic self-healing and protective nature through a simple mechanical blending technique to manage metal corrosion. The proposed coating exhibits excellent corrosion resistance, which is primarily attributed to the combination of thermal-driven healing and active corrosion inhibition. Paraffin wax and 2-polybenzothiazole-loaded CeO 2 nanotubes (CeO 2 -MBT) are directly doped into epoxy coating to perform such a multifunctional role. CeO 2 nanocontainers and encapsulated corrosion inhibitor MBT can be released by pH triggers to achieve instant corrosion inhibition upon the surface of metal substrate. In addition, any physical defects in the coating are responsively repaired by heating incorporated paraffin wax to regain structural integrity and consequent barrier function. Corrosion protection efficiency remains sufficient even after ten cycles of damage and healing. Such a multiple-functional coating strategy provides an alternative pathway toward efficient and sustainable performance to tackle corrosion-related challenges of metal components in both short-term and long-term services.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 20
·10927-10937
·
IF 11.9
Jianyu Han,Zhixin Zhang,Zhuoran Xu,Lunhua He,Feiran Shen,Yehong Wang,Xuebin Liu,Meiling Guo,Zaihong Guan,Feng Wang
The interfaces in heterogeneous catalysts play an important role in their performances by either directly providing active sites through the synergistic effects from different catalyst compositions or indirectly modulating the state of active sites. However, constructing abundant interfaces in heterogeneous catalysts is a key scientific challenge since it requires the high dispersion of all catalyst compositions involved in substrate activation. A surface reduction strategy is proposed as the solution for this challenge, which creates a pyramid-type catalyst, (Pt/4nmCeO2)/SiO2, with maximized interfacial Pt–CeO2 sites as an example. Pt is chemically bound in surface reductive centers of 4 nm CeO2 nano-islands, generating stable Pt2+ sites with moderate hydrogenation capacity compared to Pt0 sites on bulk CeO2 and SiO2. This work facilitates the development of heterogeneous catalysts by presenting a high level of controlling the local chemical environment within nanomaterials.
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
TALANTA
·
2025
·
IF 6.1
Xiao-Jie Shi,Xin-Yi Dai,Yu Wu,Ting-Ting Zhang,Tian-Shun Song,Xiang-Ling Li,Jing-Jing Xie
Achieving a simple process, detailed information, and visual response for cancer diagnosis and treatment is desirable but challenging. Herein, we develop a self-cascade system-triggered colorimetric array for the sensitive detection of choline, a promising biomarker in triple-negative breast cancer (TNBC). The system utilizes a ChOx-Ce 3+ probe, where ChOx catalyzes the oxidation of target choline to betaine, generating H 2 O 2 , which then in situ reacts with Ce 3+ to form a CeO 2 nanozyme. This nanozyme exhibits robust oxidase (OXD)-like activity, oxidizing tetramethylbenzidine (TMB) to oxTMB, resulting in a visible color change that correlates with choline concentration. The self-triggered cascade mechanism significantly simplifies the detection process by eliminating the need for expensive materials and complex equipment. Additionally, it enhances the selectivity, resistance to protein interference, and long-term stability of the probe. The system demonstrated high accuracy in measuring choline concentrations in MDA-MB-231 cells and real samples, with recovery rates ranging from 97.4 % to 101 %. These results illustrate the potential of the self-cascade system-triggered colorimetric array for early TNBC detection and therapeutic monitoring, offering a cost-effective, user-friendly diagnostic tool for clinical applications.
研究领域:
生物化学
·
癌症诊断
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Tianli Liu,Jian Zhang,Ye Xiao,Yuting Xia,Mingjie Xu,Jingxi Zhang,Ruiping Liu,Chang-An Wang
Supported noble metal catalysts have a high catalytic activity and selectivity. However, fast surface reconstruction and sintering of noble metal particles during a high-temperature reaction process pose a major challenge to the stability of the catalysts. In this study, sinter-resistant supported noble metal catalysts were prepared by constructing an oxide nanotrap. Pt/Al2O3 was used as a research paradigm. Dopamine was applied as a structure-directing agent and pore-forming agent to form a porous CeO2 overlay on the surface of Pt/Al2O3 and encapsulate Pt nanoparticles. Due to the confinement of CeO2 and its interaction with Pt, the modified Pt/Al2O3@CeO2 exhibits superior catalytic activity and antisintering stability. This method can be extended to other supported catalyst systems.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Dewen Sima,Haojin Wu,Koukou Tian,Shijun Xie,Joel Jie Foo,Shuirong Li,Duo Wang,Yueyuan Ye,Zhifeng Zheng,Yun-Quan Liu
Ammonia decomposition is an effective way for high purity hydrogen production , yet the increase of catalytic activity at low temperatures remains a big challenge for this process. In this paper, a CeO 2 –ZrO 2 composite with Al as the secondary dopant was synthesized by the co-precipitation method, which was used as the carrier of nickel metal for ammonia decomposition. The experimental results showed that an obvious increase in catalytic activity of the ammonia decomposition at the relatively low temperature range of 450–550 °C was achieved over the nickel catalyst with CeO 2 –ZrO 2 composite as the metal carrier. Specifically, the complete decomposition of ammonia was achieved at 580 °C for Ni/Al–Ce 0.8 Zr 0.2 O 2 catalyst, while only 92% of ammonia was decomposed at 600 °C over the reference Ni/Al 2 O 3 catalyst. The characterization results indicated that the introduction of Al as the secondary dopant of ceria not only increases the specific surface area and oxygen defects on the surface, but also enhances the nickel metal dispersion and metal-support interaction, thus enhances the catalytic performance of Ni/Al–Ce 0.8 Zr 0.2 O 2 catalyst in the ammonia decomposition.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yida Huang,Youlong Liang,Chaoran Xie,Qingyuan Gui,Jinlei Ma,Hongxian Pan,Zeyu Tian,Lei Qi,Mei Yang
Ce1–xO2:x%Cu2+ nanobelts were bioinspired, designed, and fabricated using commercial filter papers as scaffolds by adding Cu(NO3)2 in the original sol solution of CeO2 nanobelts, which display excellent catalyst properties for CO oxidation and photocatalytic activity for organic dyes. Compared with pure CeO2, CuO belts were synthesized using the same method and the corresponding Ce0.5O2:50%Cu2+ bulk materials were synthesized without filter paper as scaffolds; the synthesized Ce1–xO2:x%Cu2+ nanobelts, especially Ce0.5O2:50%Cu2+ nanobelts, can decrease the reaction temperature of CO to CO2 at 100 °C with the conversion rate of 100%, much lower than the formerly reported kinds of Ce1–xO2:x%Cu2+ catalysts. Meanwhile, the synthesized Ce1–xO2:x%Cu2+ nanobelts also display better photocatalytic activity for organic dyes. All of these results provide useful information for the potential applications of the synthesized Ce1–xO2:x%Cu2+ nanobelts in catalyst fields.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2016
·
IF 2.125
Qie Li,Zhihong Li,Dandan Feng,Tao Yang,Ying Li
The role of rare earth oxides (CeO 2 and Y 2 O 3 ) in the microstructures and properties of vitrified diamond composites was comprehensively investigated. The results revealed that the incorporation of appropriate amounts of CeO 2 or Y 2 O 3 could not only decrease the refractoriness but also increase the fluidity of vitrified bonds. In comparison with composites containing Y 2 O 3 , composites doped with CeO 2 possessed lower porosity and coefficient of thermal expansion . When adding 4 wt.% rare earth oxides, the flexural strength and thermal conductivity of composites containing CeO 2 simultaneously achieved the maximums, 102.5 MPa and 4.37 W·m − 1 ·k − 1 , respectively, which highly surpassed the values of composites without additives and composites containing Y 2 O 3 . In general, the difference of CeO 2 and Y 2 O 3 on properties of composites was mainly attributed to the different accumulation effects of corresponding cations. CeO 2 played greater impact than Y 2 O 3 on the properties of vitrified diamond composites.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Nuanqin Zhang,Junyi Chen,Zhanqiang Fang,Eric Pokeung Tsang
The development of an ultra-efficient heterogeneous Fenton catalyst that has practical application and can be easily separated is of great importance. In this study, a novel nanocomposite, Fe 0 /CeO 2 , was successfully synthesised and applied for Fenton oxidation of tetracycline. The results show that Fe 0 /CeO 2 significantly enhanced the removal of pollutants, which suggests a synergistic effect between nanoscale zero-valent iron and CeO 2 . Furthermore, the composite catalyst exhibited ideal reusability and wide pH adaptation. A radical identification experiment revealed that surface-bounded OH ( OH ads) played a critical role in Fenton reaction, and compared with bare nanoscale zero-valent iron, Fe 0 /CeO 2 remarkably promoted the generation of OH in the Fenton system, mostly because CeO 2 not only increased the adsorption properties of the catalyst, it also accelerated electron transfer to promote the decomposition of H 2 O 2 due to the abundance of surface oxygen vacancies. A reasonable degradation pathway was also proposed for tetracycline on the basis of the detected intermediates. Our findings help to understand the mechanism of tetracycline degradation by heterogeneous Fenton-like, and also provide an efficient system for organic wastewater treatment.
研究领域:
环境科学
·
污染治理
✓ 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）