APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yuan Fang,Shiyu Ji,Xin Wu,Jianfeng Zhu
Passive direct liquid fuel cells are promising power generation devices with the advantages of convenient transportation, storage for liquid fuel and high power density. This paper focuses on improving the intrinsic electrocatalytic performance and durability of nitrogen-doped carbon (N-C) cathodic electrocatalysts. Then, lamellar structured Ce-S-NC heterogeneous electrocatalyst was synthesized and used as a highly durable cathode for two types of passive direct liquid fuel cells, i.e. , direct methanol fuel cells (DMFCs) and direct borohydride fuel cells (DBFCs). In this work, the effect of the S/C molar ratio on the microstructure and electrocatalytic performance of the Ce-S-NC electrocatalysts was investigated, and excellent intrinsic oxygen reduction reaction activity was obtained at an S/C molar ratio of 0.15. The peak power densities of Ce-S-NC based DMFCs reached up to 12.5, 23.6 and 41.9 mW·cm −2 at 20, 40 and 60 °C, respectively. The peak power densities of 59.3, 84.6 and 132.6 mW·cm −2 were obtained in Ce-S-NC based DBFCs at 20, 40 and 60 °C, respectively. In the durability tests, both the Ce-S-NC based air-breathing DBFCs and passive DBFCs showed the stable operation than that of N-C and Ce-NC. When the current density increased from 50 to 150 mA·cm −2 , the Ce-S-NC based DBFC can be operated for 882 h, and only 34 and 91 h for that of N-C and Ce-NC. The electrochemical impedance spectroscopy tests proved Ce-S-NC based DBFC showed the faster mass transfer efficiency. The outstanding durability of Ce-S-NC is mainly attributed to the improved defect density and mass transfer.
研究领域:
材料科学
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能源科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 3
·710-718
·
IF 5.344
Zhengdi Wang,Liyang Fu,Yu Zhu,Sa Wang,Guohong Shen,Lan Jin,Ruizheng Liang
The combination of chemodynamic therapy (CDT) with photothermal therapy (PTT) is an efficacious strategy in cancer treatment to acquire satisfactory therapy efficiency in the endogenous redox reaction and external laser induction. In this work, we have designed Ce doped Cu–Al layered double hydroxide (CAC-LDH) ultrathin them through a bottom-up synthesis method, and further loaded them with indocyanine green (ICG). The synthesized ICG/CAC-LDH was used as a Fenton-catalyst and photothermal agent. With the Fenton activity, the ICG/CAC-LDH nanosheets could decompose H2O2 and exhibit a low KM value (1.57 mM) and an ultra-high Vmax (4.88 × 10−6 M s−1) value. Due to the presence of oxidized metal ions, ICG/CAC-LDH could induce intracellular GSH depletion and reduce Cu2+ and Ce4+ to Cu+ and Ce3+, respectively. The generated Cu+ and Ce3+ further reacted with local H2O2 to generate toxic hydroxyl radicals (˙OH) via the Fenton reaction. Owing to the obviously enhanced absorption of ICG/CAC-LDH at 808 nm, the photothermal efficiency of ICG/CAC-LDH increased significantly compared with ICG (ΔT = 34.7 °C vs. 28.3 °C). In vitro studies substantiate the remarkable CDT/PTT efficacy, with complete apoptosis of HepG2 cancer cells (the cell viability is less than 2%) treated with 25 μg mL−1 of ICG/CAC-LDH. Furthermore, ICG/CAC-LDH could also act as a contrast agent for cancer magnetic resonance imaging (MRI) and photoacoustic imaging (PAI). These results demonstrate the potential of ICG/CAC-LDH as an integrated agent for dual-modal imaging and synergistic CDT/PTT.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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材料科学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Yimin Zhou,Fei Tang,Chenyang Li,Xinzhe Fang,Xuan Li,Jia Xiao,Guowei Du,Shijie Xu
The substrate-free ultrathin phosphor-glass composite (PGC) provides significant advantages for all-inorganic light-emitting diodes (LEDs), offering enhanced resistance to light radiation and chemical corrosion. However, achieving a PGC thickness below 100 µm remains challenging due to its brittle nature. Herein, this work presents a novel strategy to fabricate an ultrathin cyan PGC for all-inorganic LEDs, based on our home-synthesized Ce-activated Ca 2 YAlGa 2 Si 2 O 12 phosphor (CYAGS:Ce). The phosphor emits bright cyan light centered at λ em 497 nm with a FWHM of 93 nm and an internal quantum yield (IQY) greater than 60%. The luminescence mechanism, including concentration and thermal quenching, is investigated in detail. Using tape-casting and low-temperature co-firing, an ultrathin PGC with a thickness of 98 µm is achieved. Structural and luminescence properties are compared to highlight the glass matrix's influence. Furthermore, based on as-prepared ultrathin PGCs, a compact LEDs with a low correlated color temperature (CCT, 3384 K) and high color-rendering index (CRI, R a = 85.7) is obtained by integrating both red and cyan PGCs with a commercial 420 nm blue chip. This work advances the understanding of CYAGS:Ce cyan phosphor and provides a versatile strategy for fabricating ultrathin PGCs, highlighting their potential applications in all-inorganic LED lighting.
研究领域:
材料科学
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光电子学
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固态照明
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Run Yuan,Yihe Qin,Can He,Zichen Wang,Lu Bai,Hong Zhao,Zijian Jiang,Lingyao Meng,Xuwen He
It is important to develop a catalyst that has high catalytic activity and can improve the degradation efficiency of refractory organic pollutants in the catalytic ozonation process. In this study, Fe-Mn-Cu-Ce/Al 2 O 3 was synthesised via impregnation calcination for catalytic ozonation of bio-treated coking wastewater. The physical and chemical characteristics of the catalysts were analysed using X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller nitrogen adsorption–desorption methods. The effects of catalyst dosage, pH, and reflux ratio on the degradation efficiency of wastewater were examined in laboratory-scale experiments. The chemical oxygen demand (COD) removal rate of bio-treated coking wastewater was estimated to be 52.76 % under optimal conditions. The experiments on the catalytic mechanism demonstrated that the surface hydroxyl formed by the Lewis acid sites on the surface of the catalyst can react with ozone as the active site forming the active oxygen (·OH, ·O 2 – , and 1 O 2 ), thereby efficiently degrading the organic pollutants in coking wastewater. Furthermore, a pilot-scale experiment on the catalytic ozonation of bio-treated coking wastewater was carried out using an Fe-Mn-Cu-Ce/Al 2 O 3 catalyst, while the effects of the initial pollutant concentration, ozone concentration, and gas flow on the COD removal rate were studied on a pilot scale. It was found that the COD removal rate of the wastewater was ∼ 60 % under optimal parameters. After the treatment, the wastewater steadily reached the coking wastewater discharge standard (COD < 80 mg/L), while the operating cost of catalytic ozonation reached ∼ 0.032$/m 3 , thereby paving the way toward economic engineering applications. The COD degradation kinetics in the bio-treated coking wastewater followed pseudo-second-order kinetics. Three-dimensional fluorescence and gas chromatography–mass spectrometry revealed that macromolecular organic pollutants in the bio-treated coking wastewater were greatly degraded. In summary, Fe-Mn-Cu-Ce/Al 2 O 3 exhibited good reusability, high catalytic activity, and low cost and has a wide application prospect in the treatment of coking wastewater.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xiao Yang,Zhuwei Yang,Linsen Li,Zhao Jiang,Guangxu Cheng
Dry methane reforming (DRM) represents a highly promising approach to greenhouse gas conversion (CO 2 and CH 4 ) to valuable byproducts. However, severe carbon deposition and catalyst deactivation inhibit large-scale applications. The work designed new catalysts with a yolk-shell structure using the water-in-oil microemulsion method. The catalysts were composed of a yolk-shell structure, with Ni-M as the active point and silica as the shell. The catalytic performance evaluation indicates that the Ni-M @SiO 2 catalysts show higher CH 4 and CO 2 conversion compared with the Ni@SiO 2 and conventional catalysts at 750 ℃, suggesting the yolk-shell structure and added M species enhance the DRM activity. The XRD, HRTEM, XPS, BET, H 2 -TPR, and CO 2 -TPD analysis confirmed the existence of yolk-shell configuration and evident electronic effect among Ni, M species, and SiO 2 . The long term measurements indicate that the added M species also bring higher carbon deposition tolerance for DRM, where Ni-Ce@SiO 2 and Ni-Zr@SiO 2 exhibit good structural and catalytic stability for DRM over 100 h. Through XRD, TEM, and TGA characterizations of the exhausted catalysts, it is determined that the coke deposition resistance of the catalyst is improved as a result of increased oxygen mobility and enhanced Ni dispersion on the catalytic surface, both of which are enhanced by the added Ce species. The structural analysis of the spent catalysts indicates that the tolerance of carbon deposition is improved by the yolk-shell samples. This study can offer valuable insights for the development of Ni-based catalysts with exceptional carbon deposition capability for DRM.
研究领域:
催化
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化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Debo He,Yizhu Gong,Jiupai Ni,Chengsheng Ni
Solid oxide fuel cells (SOFCs) operating at a high temperature can be used to generate electricity and produce syngas from hydrocarbon fuels. In this work, the in-situ decoration of CeO 2 and Ni nanoparticles on the surface of chromite anode has been explored; i.e. , the exsolution of CeO 2 from La 0.75 Ce 0.05 Ca 0.2 Cr 0.9 Ni 0.1 O 3 (Ce-LCN) can be achieved in the oxygenation in air to boost the exsolution of Ni 0 under the fuel condition. The SOFC with a Ce-LCN anode showed higher performance and better stability under propane and H 2 fuel than the one La 0.8 Ca 0.2 Cr 0.9 Ni 0.1 O 3 (LCN) anode because of the formation of CeO 2 and Ni 0 nanoparticles. Setting in the distribution of H 2 in the existing natural gas pipeline, hydrogen-injection in CH 4 (20% H 2 in volume in CH 4 ) was found for the first time to efficiently improve the coking resistance of the anode because the H 2 was able to boost the transfer of oxygen from the anode to the direct internal reforming. The conversion of CH 4 was found to be around 85% and the selectivity for CO was close to unity. This study provides a viable solution to the design of complex perovskite SOFC to produce electricity and syngas simultaneously from CH 4 .
研究领域:
能源材料
·
燃料电池技术
·
催化
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Yongchao Yao,Shengjun Sun,Hui Zhang,Zixiao Li,Chaoxin Yang,Zhengwei Cai,Xun He,Kai Dong,Yonglan Luo,Yan Wang,Yuchun Ren,Qian Liu,Dongdong Zheng,Weihua Zhuang,Bo Tang,Xuping Sun,Wenchuang (Walter) Hu
Electrocatalytic hydrogen production from seawater holds enormous promise for clean energy generation. Nevertheless, the direct electrolysis of seawater encounters significant challenges due to poor anodic stability caused by detrimental chlorine chemistry. Herein, we present our recent discovery that the incorporation of Ce into NiFe layered double hydroxide nanosheet array on Ni foam (Ce-NiFe LDH/NF) emerges as a robust electrocatalyst for seawater oxidation. During the seawater oxidation process, CeO 2 is generated, effectively repelling Cl − and inhibiting the formation of ClO − , resulting in a notable enhancement in the oxidation activity and stability of alkaline seawater. The prepared Ce-NiFe LDH/NF requires only overpotential of 390 mV to achieve the current density of 1 A cm −2 , while maintaining long-term stability for 500 h, outperforming the performance of NiFe LDH/NF (430 mV, 150 h) by a significant margin. This study highlights the effectiveness of a Ce-doping strategy in augmenting the activity and stability of materials based on NiFe LDH in seawater electrolysis for oxygen evolution.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Li Rushuo,Ban Tao,Zhao Danfeng,Lin Jing,Liu Zhiyuan,Wang Linmeng,Huang Xiubing,Tao Zhiping,Wang Ge
Olefin hydrogenation under mild condition is crucial and challenging for industrial applications. Herein, defective UiO-66(Ce) was constructed by using cyanuric acid as the molecular etching “scissors” and further to synthesize heterogeneous catalyst with highly dispersed RuNi nanoparticles (Ru 1 Ni 1.5 @UiO-66(Ce)-12 h). The construction of Ce-O-Ru/Ni heterogeneous interfaces and Ni–Ru bonds provide electron transfer channels from Ce-oxo clusters and Ni species to Ru species. Furthermore, the microenvironment and electronic structure of Ru 0 active sites were synergistically regulated by adjusting the content of metal-organic frameworks (MOFs) defects and Ni promoter, thereby enhancing the adsorption and activation ability of H–H and C=C bonds. Therefore, Ru 1 Ni 1.5 @UiO-66(Ce)-12 h achieved dicyclopentadiene saturated hydrogenation (100% conversion) to tetrahydrodicyclopentadiene (∼ 100% selectivity) under mild condition (35 °C, 1 MPa) with only 25 min. Meanwhile, the sample exhibited excellent structural stability after 6 cycles test. This study provides a promising strategy for the rational design of remarkable noble metal-based catalysts for practical applications.
研究领域:
催化
·
化学工程
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 16
·3388
·
IF 4.6
Shefeng Li,Pengyi Zhao,Ziyang Liu,Chang Wang,Linling Wang,Siyu Ding
Microwave-assisted processing has shown tremendous promise in accelerating chemical reactions and reducing energy consumption through targeted dielectric heating. This study develops MOF-derived Mn-Co and Ce-Co oxide catalysts for energy-efficient benzene oxidation via microwave catalysis. The MnCo spinel oxides (particularly MnCo11-400) exhibit superior microwave absorption and catalytic activity due to enhanced oxygen mobility and tailored dielectric properties. Microwave irradiation enables rapid benzene mineralization over the MnCo11-400 catalyst, achieving 78% conversion at 30 W and complete conversion at 50 W, demonstrating exceptional energy efficiency at low power inputs. Microwaves significantly lower the reaction temperature compared to conventional thermal catalysis (ΔT = 100–250 °C). Stability tests confirm robustness over repeated power cycling (80% conversion retained after 3 × 1 h on/off cycles). Furthermore, an adsorption–microwave oxidation synergistic strategy is demonstrated: pre-adsorbed low-concentration benzene (1.15 mmol) at ambient temperature undergoes complete mineralization within 20 min under 30 W microwave irradiation. The intermittent microwave operation achieves equivalent benzene removal to continuous thermal processing while significantly reducing energy demand. This work establishes MOF-derived spinel oxides as high-performance microwave catalysts for low-temperature VOC abatement.
研究领域:
催化
·
环境化学
·
材料科学
·
微波化学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jin Wang,Junxia Wang,Yibing Zhang,Yuxiang Li,Yuancheng Teng,Zhe Wang,Hongbin Tan
A series of Nd and Ce co-doped (Gd 1−x Nd x ) 2 (Zr 1−x Ce x ) 2 O 7 (0 ≤ x ≤ 1) pyrochlores were synthesized by flux method at 900–1000 °C using nitrates as starting materials and a small amount of NaF as fluxing agent . The influences of contents of Nd/Ce, fluxing agent and reaction temperature on the phase structure of the pyrochlores were systematically investigated by X-ray diffraction (XRD) and Raman spectroscopy (Raman). The chemical stability of Nd and Ce co-doped pyrochlore bulk ceramics was also evaluated. XRD and Raman results showed that the crystalline phase of (Gd 1−x Nd x ) 2 (Zr 1−x Ce x ) 2 O 7 (0 ≤ x ≤ 1) pyrochlores always remained a single disordered defect-fluorite structure for any x value. XRD, Raman spectrum and SEM-EDX results revealed that the Nd and Ce could be co-doped at the Gd-site and Zr-site of the Gd 2 Zr 2 O 7 pyrochlore structure, respectively. The normalized release rates of Gd, Zr, Nd and Ce in (Gd 1−x Nd x ) 2 (Zr 1−x Ce x ) 2 O 7 pyrochlore bulk ceramics (x = 0.25, 0.5 and 0.75) remained relatively constant in a low value below 10 −4 g m −2 d −1 at 90 °C for 7 days, exhibiting superior chemical stability.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·65388-65397
·
IF 5.6
Jiahao Zha,Chongjun He,Fangzhou Chen,Xianhong Li,Jiayin Song,Chenguang Deng,Qian Li,Lijuan Liu,Mingjun Xia,Yuangang Lu
The fluorescence intensity ratio (FIR) technique has emerged as a pivotal approach in non-contact optical thermometry, offering substantial application potential. In this study, Y 3 Al 5 O 12 (YAG) phosphors co-activated with Ce 3+ and Cr 3+ ions were successfully synthesized through a high-temperature solid-state reaction method. Spectroscopic analysis revealed efficient energy transfer between the dopant ions, manifesting as distinct luminescence intensity variations compared to their single-doped counterparts. Under 450 nm excitation, the system demonstrates prominently yellow-green emission from Ce 3+ ions and well-resolved red emission from Cr 3+ ions, ensuring excellent spectral discrimination. Capitalizing on the differential thermal response between the two luminescent centers, the developed system achieves remarkable temperature sensing performance. The FIR method yields a maximum relative sensitivity of 0.845 % K −1 , maintaining sensitivity above 0.6 % K −1 throughout the 340–580 K range, coupled with exceptional temperature resolution below 0.03 K. Furthermore, we have engineered a novel FIR thermometry system incorporating 3D-printed spectral modules and fiber-optic phosphor encapsulation. The integrated system demonstrates superior sensing capabilities, reaching sensitivity values of 1.23 % K −1 in Cr 3+ lifetime mode and 4.64 % K −1 in FIR mode. These results indicate that Ce/Cr co-doped YAG has exceptional potential in multimodal optical thermometry applications.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qi Chen,Weirui Chen,Jing Wang,Gaozu Liao,Xukai Li,Xingmei Guo,Laisheng Li
Small molecular carboxylic acids (SCAs) are common in natural waters, but their impact on advanced oxidation processes (AOPs) is understudied. This study investigates the effects of various carboxylic acids, such as oxalic acid (OA), formic acid (FA), acetic acid (AA), succinic acid (SA), and benzoic acid (BA), on a Ce single-atom-doped graphitic carbon nitride (Ce–CN) photocatalytic ozonation (PCO) system. Among the tested SCAs, only OA significantly promoted O3 activation and pollutant degradation. When degrading atrazine (ATZ), Ce–CN performed worse than CN, but Ce–CN exhibited superior activity when OA was the target. The OA removal was 98% in the PCO/Ce–CN system, while it was 82% in the PCO/CN system in 30 min. The introduction of OA also enhanced ATZ removal from 55 to 86% within 5 min in the PCO/Ce–CN system. Moreover, OA’s yield during macromolecular organic compound degradation and its proportion among SACs affected PCO/Ce–CN activity. Mechanistic studies showed that OA could bind with Ce–CN, forming a Ce–OA complex that facilitated ligand-to-metal electron transfer (LMET), reducing the redox potential of the Ce(III)/Ce(IV) cycle, enhancing the ATZ removal efficiency, and boosting ozone activation. O3 decomposed into *O and •OH on Ce–CN, which were the primary reactive oxygen species for pollutant degradation. These findings highlighted the unique role of OA in Ce-based PCO systems, offering insights for enhancing AOP performance.
研究领域:
环境科学
·
水处理
·
催化
·
光化学
·
臭氧化
✓ 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）