EES Catalysis
·
2023
·Vol. 2
·期 1
·365-378
·
IF 0
Yaqi Hu,Zhong Liang,Yabin Zhang,Yaping Du,Hongbo Zhang
Hydrogen production with high efficiency and low CO selectivity in methanol steam reforming (MSR) is of pivotal importance. However, there is limited understanding of the active sites and reaction mechanisms during catalysis. In this study, we maximized the interfacial site, known as the active component in MSR, of Ni–CeOx by atomically dispersed Ni and Ce over the carbon–nitrogen support to generate the Ni and Ce dual-atomic catalyst (DAC), which achieved 6.5 μmolH2 gcat.−1 s−1 H2 generation rate and 0.8% CO selectivity at 99.1% methanol conversion at 513 K. The finely dispersed Ni and Ce structure was confirmed by systematic characterization of AC HAADF-STEM and EXAFS. Electron transfer from Ce to Ni was confirmed simultaneously by quasi-in situ XPS analysis. Moreover, the reaction mechanism of methanol steam reforming was clarified by combining kinetic studies with isotope-tracing/exchange analysis (i.e., KIEs and steady-state isotopic transient kinetic analysis (SSITKA)), which suggests that the steam reforming consists of two tandem reaction processes: methanol decomposition (MD) and water–gas shift (WGS) reaction, with methanol and water activation at independent active sites (e.g., Ni and oxygen vacancy over CeOx), and that hydrogen generation was primarily determined by both C–H bond rupture and OL–H (OL represents the lattice oxygen) cleavage within methoxy and hydroxyl groups, respectively, with the catalytic surface mainly covered by CO and methoxy groups. A shift of WGS involvement in hydrogen generation from negligibly influenced to significantly promoted was selectively observed once modifying the reaction from differential conditions to a high methanol conversion regime, and two quantification methods have been established by comparing the molecule ratio between CO and CO2 or H2.
研究领域:
催化化学
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能源科学
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材料科学
·
表面化学
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DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 22
·11642-11650
·
IF 2.93
Si Zhou,Jianxin Zou,Xiaoqin Zeng,Wenjiang Ding
The catalytic effects of rare earth fluoride REF 3 (RE = Y, La, Ce) additives on the dehydrogenation properties of LiAlH 4 were carefully investigated in the present work. The results showed that the dehydrogenation behaviors of LiAlH 4 were significantly altered by the addition of 5 mol% REF 3 through ball milling . The destabilization ability of these catalysts on LiAlH 4 has the order: CeF 3 >LaF 3 >YF 3 . For instance, the temperature programmed desorption (TPD) analyses showed that the onset dehydrogenation temperature of CeF 3 doped LiAlH 4 was sharply reduced by 90 °C compared to that of pristine LiAlH 4 . Based on differential scanning calorimetry (DSC) analyses, the dehydriding activation energies of the CeF 3 doped LiAlH 4 sample were 40.9 kJ/mol H 2 and 77.2 kJ/mol H 2 for the first and second dehydrogenation stages, respectively, which decreased about 40.0 kJ/mol H 2 and 60.3 kJ/mol H 2 compared with those of pure LiAlH 4 . In addition, the sample doped with CeF 3 showed the fastest dehydrogenation rate among the REF 3 doped LiAlH 4 samples at both 125 °C and 150 °C during the isothermal desorption. The phase changes in REF 3 doped LiAlH 4 samples during ball milling and dehydrogenation were examined using X-ray diffraction and the mechanisms related to the catalytic effects of REF 3 were proposed.
研究领域:
材料科学
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氢气储存
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固态化学
·
能源材料
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yangyang Xie,Lei Zhou,Jian Li,Xuxia Zhang,Kejia Liu,Hui Zhang,Tao Qi
The zinc-cerium redox flow battery has great potential in the field of energy storage for the merits of high voltage and low cost. However, undesirable dendrites growth and insufficient active sites of Zn anode electrode remain a grand challenge to obtain a good reversibility and cycling stability. Herein, we propose a promising and universal method to stabilize Zn anode by modifying commercial graphite carbon felt with metal–organic framework derivative. Owing to the porous structure and rich active sites of heteroatom N and O introduced by metal–organic framework derivative, the modified carbon felts can effectively induce zinc uniformly nucleation and deposition. As a result, the carbon felt electrode modified with ZIF-8 derivative exhibits a lower overpotential than pristine carbon felt electrode. And it exhibits a high average energy efficient of 80.0 % at the current density of 20 mA cm −2 for 14 cycles, which is better than previous results of Zn-Ce redox flow battery. When modified with cobalt-base ZIF-67 derivative, the energy efficient can even reach up to 86.07 % in first cycle. This work offers a strategy in zinc-based redox flow battery research to improve the reversibility and cycling ability by introducing metal–organic framework derivative.
研究领域:
储能
·
电化学
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材料科学
·
氧化还原液流电池
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.3
Sirui Han,Cheng Ke,Yang Wu,Bo Yu,Xianzong Wang,Long Wang,Dongsheng Li,Feng Zhou,Jianxi Liu
The addition of corrosion inhibitors to epoxy resin coatings is an effective strategy of preventing corrosion process of the substrate. However, the anti-corrosion performance of epoxy resin coatings is not satisfactory in terms of long period of time, owing to the leaking out of corrosion inhibitors. In this paper, we present a composite epoxy resin coating with enhanced long-term anti-corrosion performance, achieved through the synergistic combination of inorganic and organic corrosion inhibitors that refer to metal-organic frameworks (MOFs) with controlled loading of benzotriazole (BTA). The complexation of the inorganic corrosion inhibitor Ce 4+ within the UiO-67 structure (UiO-67-Ce) is accomplished by partially substituting organic ligands with Ce-coordinated 2,2′-bipyridine-5,5′-dicarboxylic acid (Bpydc-Ce). Then, organic corrosion inhibitor BTA is further incorporated into the UiO-67-Ce@BTA by solvent loading process. The organic and inorganic inhibitors-loaded MOFs are dispersed in the epoxy matrix to fabricate anti-corrosion coatings via spraying-coating method. The UiO-67-Ce@BTA/epoxy coating exhibits high corrosion inhibition efficiency (99.95 %), due to efficient release of the bifunctional inhibitors. Additionally, scratch test of the UiO-67-Ce@BTA/epoxy coating demonstrates active corrosion protection performance, which can effectively mitigate localized corrosion. Therefore, we establish an organic-inorganic synergistic anti-corrosion strategy using UiO-67-Ce@BTA as functional nanofillers, offering promising strategy for corrosion protection.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhihao Jin,Yajing Shen,Xianfu Chen,Minghui Qiu,Yiqun Fan
The membrane structure and properties have a significant influence on its anti-fouling performance during the separation process. In this study, Ce was introduced to inhibit the phase transformation of TiO 2 to obtain a tight ultrafiltration (UF) membrane with a more uniform pore size, a more integrated membrane layer as well as to strengthen the membrane surface charge to provide superior anti-fouling performance for the membrane during protein separation. Single anatase phase of the material proves that the introduction of Ce effectively inhibited the phase transformation of TiO 2 and prevented the occurrence of cracks. The prepared Ce-doped TiO 2 membrane exhibited excellent performance, with a membrane thickness of 700 nm, water permeance of 175 L·m −2 ·h −1 ·bar −1 and molecular weight cut-off of approximately 18 kDa. Additionally, it showed excellent BSA separation performance, as the stable permeance and rejection rate could be maintained at 120 L·m −2 ·h −1 ·bar −1 and 100 %, respectively. Meanwhile, Ce-doped TiO 2 membrane showed superior anti-fouling performance compared to pure TiO 2 membrane due to its strengthened surface charge and uniform pore size, with the J/J0 maintained a value of 0.69. Based on the obtained results, the Ce-doped TiO 2 membranes prepared in this study exhibit good potential for protein separation.
研究领域:
材料科学
·
膜技术
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分离科学
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环境工程
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纳米技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jia'nan Wang,Can Cheng,Jiaying Xu,Zhisong Liu,Haomiao Xu,Wenjun Huang,Zan Qu,Naiqiang Yan
Tetrafluoromethane (CF 4 ), a highly potent greenhouse gas characterized by the notable capacity to absorb infrared radiation, making its effective control essential for mitigating global warming. However, the activation of CF 4 faces challenges in the conventional approaches caused by its symmetric structure and strong C F bonds. In this work, we presented an approach to enhance the activation of C F bonds using an inductance-enhanced Ce/Al 2 O 3 catalyst within the designed plasma-catalytic reaction system featuring a step-discharge effect. The optimal CF 4 decomposition efficiency reached approximately 89.5 % at the power of 18 W, while maintaining above 88.6 % for 24 h. The impact of plasma conditions and flue gas parameters on CF 4 decomposition and energy efficiency was also investigated. Py-IR showed that the Ce/Al 2 O 3 catalyst provided more Lewis acid sites as the active centers for breaking C F bonds. In situ FTIR and in situ OES studies revealed that the intermediates generated from CF 4 decomposition can react with active oxygen to form C O bond under the plasma-catalytic effect, preventing the reformation of C F bonds. DFT calculations demonstrated that the Ce/Al 2 O 3 exhibited a lower energy barrier to dissociate CF 4 and a stronger adsorption for O 2 . This work established a novel pathway for the activation of C F bonds to achieve the efficient decomposition of CF 4 at low temperatures.
研究领域:
环境化学
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等离子体催化
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材料科学
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温室气体减排
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70338
·
IF 3.8
Yuanyuan Li,Hongbing Yang,Yilei Huang,Shichang Cheng,Chang-An Wang,Yanhao Dong
As a pivotal optical material, the microstructure of YAG (yttrium aluminum garnet) nanocrystalline ceramics directly determines their laser and luminescent performance. This study demonstrates that rare-earth doping at grain boundaries significantly improves sintering behavior through a dual-stage regulation mechanism: during the initial stage (relative density 65%–90%), dopants (Nd/Ce) suppress mass diffusion by stabilizing grain boundary structures; whereas in the intermediate stage (75-85% relative density), they enhance diffusion by modifying grain boundary energy states. This kinetic regulation enables Nd-doped samples to achieve 99.3% relative density at 1200°C (50°C lower than pure YAG) while maintaining grain size at 57–64 nm. The doped systems achieved the requisite thermodynamic state for successful two-step sintering at significantly lower T 1 temperatures (Nd-YAG: 1175°C, Ce-YAG: 1175°C) compared with pure YAG (1200°C). The study confirms that Nd/Ce doping achieves coordinated densification-grain growth control through grain boundary segregation, providing critical theoretical guidance for fabricating high-performance transparent ceramics, particularly for developing novel Nd/Ce:YAG laser and scintillation ceramics.
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3787-3797
·
IF 2.3
Han Zhaohao,Chu Qingyan,Wang Hao,Jia Xiaoqiong,Jiang Peng,Li Tong
We successfully synthesized a bifunctional alkaline catalyst (Co@CTS-1), on the one hand, which demonstrates exceptional catalytic performance in the aerobic oxidation of alkenes, particularly in the epoxidation of styrene, in the absence of both an initiator and a co-reducing agent, achieving a conversion rate of 74.94%, a selectivity of 71.84% for styrene oxide; on the other hand, the catalyst maintained its high activity throughout a cyclic reaction run lasting up to 2500 min, demonstrating exceptional stability in the epoxidation of styrene. The Co@CTS-1 catalyst utilizes TS-1 as the carrier, and it is modified with cobalt and cerium elements. Through the embedding of cobalt elements within the TS-1 cage, the catalyst gains the ability to activate O 2 , and by inserting cerium elements into the atomic positions of silicon, the conversion rate is further enhanced. This encapsulated structure stabilizes cobalt nanoparticles, overcoming the short lifespan issues caused by sintering and leaching in conventional supported catalysts. This work provides practical clues for the development and application of novel catalysts, and will inspire the advancement of olefin air epoxidation. Graphical
研究领域:
催化化学
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材料科学
·
化学工程
·
无机化学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 7
·3260-3268
·
IF 3.784
Qi Zhang,Ruilin Zheng,Jianyong Ding,Peng Cui,Zhongyue Wang,Peng Lv,Wei Wei
Thermally robust and highly efficient green-emitting luminescent ceramics are gradually attracting great attention as promising phosphors using in high-brightness laser phosphor display to reduce serious speckle noise as well as high cost. However, lumen density is still seriously restricting their potential applications especially under high-power density laser due to insufficient absorption of blue laser and significant thermal quenching. Here, we report an Al 2 O 3 -LuAG: Ce composite ceramic phosphor (CCP) for high-brightness laser phosphor display. Owing to good optical properties and high thermal conductivity of Al 2 O 3 , the Al 2 O 3 -LuAG: Ce CCP shows high photoluminescence quantum yield (79.6%), low thermal quenching (only 3.2% loss in luminescence at 200°C), and high thermal conductivity (18.9 W·m −1 ·K −1 ). Moreover, the Al 2 O 3 , as scattering centers, enhances the Rayleigh–Mie scattering of the blue laser, and hence the absorption of the Al 2 O 3 -LuAG: Ce CCP exhibits a remarkable improvement (~2.3 times) at 450 nm. Finally, with optimized thickness (0.3 mm) of Al 2 O 3 -LuAG: Ce CCP, an excellent luminous efficiency (216 lm·W −1 ) and outstanding lumen density (6129 lm·mm −2 ) of the green-emitting light source was obtained by driving under a high-power density (28.33 W·mm −2 ) blue laser. All of those validate the suitability of the Al 2 O 3 -LuAG: Ce CCP for high-brightness display.
研究领域:
材料科学
·
光学工程
·
光子学
·
显示技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Di Gao,Jian-Zhi Yang,Heng-Yu Wei,Kong-Zhai Li,Min Lin,Xing Zhu
C e-e Zr solid solution formation strengthens the metal-support interaction. • The catalyst reached 79.02% CO 2 conversion and methanation rate 26.35 mmol·g cat −1 ·h −1 . • Dual-role oxygen vacancies enhance charge separation and CO 2 activation. Photothermal Carbon dioxide (CO 2 ) hydrogenation is a promising strategy for solar-fuel production, but its performance is often limited by inefficient charge separation and poor low-temperature activity. Herein, Ni/Ce-Zr solid solution catalysts were developed by introducing lattice distortion to regulate the electronic structure and generate abundant oxygen vacancies. The resulting oxygen vacancies promote charge separation, enhance CO 2 activation, and strengthen the photothermal synergistic effect. Among the catalysts, 20Ni/Ce 0.75 Zr 0.25 O 2 exhibited the best performance, achieving 79.02% CO 2 conversion, over 99.00% CH 4 selectivity, a methanation rate of 26.35 ± 0.05 mmol·g cat −1 ·h −1 , and an apparent activation energy of 16.23 ± 0.70 kJ/mol at 250 °C, while maintaining stable operation for over 180 h. In situ DRIFTS results reveal that abundant oxygen vacancies facilitate the hydrogenation of key intermediates and suppress carbonate accumulation, thereby preventing catalyst deactivation. These findings demonstrate that oxygen-vacancy engineering is an effective approach for improving photothermal CO 2 methanation and provide guidance for the design of efficient solar-driven CO 2 conversion catalysts. Oxygen Vacancy-Mediated Photothermal CO 2 Methanation over Ni/Ce-Zr Solid Solution. Download: Download high-res image (208KB) Download: Download full-size image
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Rui Zhao,Huimin Ren,Yubing Si,Gang Li,Yongzhu Fu
Phenyl tetrasulfide (PTS) is a high-capacity cathode material for lithium batteries. However, it also suffers the shuttle effect of polysulfides to the lithium anode in the charge because some lithium polysulfides are still formed due to the middle sulfur atoms in the structure of PTS. The separator modification is considered as a convenient and effective strategy to reduce the shuttle effect. In this report, metal-organic framework (MOF)-801(Ce) is synthesized and coated on a polypropylene separator (MOF-801(Ce)−PP) as a polysulfide barrier. MOF-801(Ce) has a pore size of 6 Å, which is smaller than the sizes of lithium thiophenolate and lithium polysulfides. Therefore, the MOF-801(Ce)−PP can effectively inhibit the migration of active species to the lithium metal anode without affecting the passage of lithium ions. Consequently, the Li/PTS cell with the MOF-801(Ce)−PP exhibits a discharge capacity of 340.8 mAh g −1 at 0.5 C after 250 cycles, which is better than the control cell. Even when the PTS areal mass loading is 5.4 mg cm −2 , the cell with the MOF-801(Ce)−PP can still deliver a high specific capacity of 430 mAh g −1 at 0.5 C rate. This study proves a feasible strategy to overcome the polysulfide shuttle issue of organosulfide cathode materials.
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 10
·3091-3102
·
IF 7
Jianping Liu,Guijun Li,Chuanlan Xu,Hongdian Chen,Rong Jin,Lingtao Sun,Chenyang Shu,Haifeng Chen,Chaozhong Guo,Honglin Li,Yujun Si
Non-precious metal Fe–N–C materials are considered one of the promising substitutes for the Pt/C catalyst toward the oxygen reduction reaction (ORR). However, they still suffer from rapid stability reduction caused by the severe Fenton reaction in the ORR process. Here we report a supramolecular-gel-pyrolysis (SGP) method to design a non-noble CeO2/Ce-N–C composite with a hierarchically porous carbon sheet-network structure, serving as an efficient Ce single-atom-site (Ce-N4O4) catalyst for the ORR in a zinc–air battery (ZAB). The prepared catalyst displays comparable ORR catalytic activity and stability to those of Pt/C in an alkaline electrolyte. The corresponding ZAB tests also show a higher energy density and better long-term cycling durability. Theoretical calculations indicate that the enhanced ORR activity may be attributed to the fact that the presence of oxygen vacancies and the Ce-N4O4|CeO2 coupling sites can largely favor the chemical adsorption and activation of O2. This work provides a new avenue for exploring rare-earth metal single-atom ORR electrocatalysts with coupled ORR catalytic sites.
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产品关联
DOI
高影响因子
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