APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Liuxin Xu,Ya Pan,Hongmei Li,Ruichao Xu,Zhihu Sun
The presence of interfacial sites between Pt-group metals and transition metal oxides can effectively improve the catalytic activity of Pt-group catalysts, but under moisture-rich conditions they suffer from severe deactivation due to water poisoning of the active sites. Here, we propose for the first time a Lanthanum (La)-doping strategy to improve the water-resistance of the Pt-based catalysts. We synthesized a Pt-CoO/Al 2 O 3 catalyst that is active for CO oxidation under dry conditions but deactivates rapidly under moisture. This rapid deactivation is overcome by La-doping, which delivers boosted activity (100 % CO conversion at 15 °C) and long-term on-stream stability. In situ X-ray absorption fine-structure and in situ diffuse reflectance infrared Fourier transform spectra revealed that the doped La, in the form of La 2 O 3 , plays dual roles of suppressing the carbonate formation on the active sites and modifying the electronic structure of Pt. The synergetic effects between La 2 O 3 and the active Pt−O−Co interfacial sites in La-doped Pt-CoO/Al 2 O 3 lead to the outstanding activity under the moisture-rich condition.
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
Journal of Macromolecular Science Part B-Physics
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2020
·
IF 0.911
Hailin Xie,Zhihua Zhou,Wenjuan Liu,Yanmin Zhao,Tianlong Huang,Ping Chen,Ziwei Zhou,Dan Wang,Jianglong Duan,Jianjun Fang
Polymeric/ceramic composite scaffolds that are biocompatible and biodegradable are widely used for tissue engineering applications. In this work a series of poly(L-lactide-co-glycolide-co-ε-caprolactone)/nano-biaoactive glass-nano-β-tricalcium phosphate composite scaffolds were successfully fabricated and the influences of the inorganic content and freezing temperature on the physical properties were studied. The composite scaffolds with various inorganic contents showed an interconnected pore structure with irregular shapes. The composite scaffolds had a porosity that was reduced with increasing inorganic content and decreasing freezing temperature. The incorporation of inorganic fillers and decreasing freezing temperature improved the mechanical properties of the hybrid scaffolds. By appropriate control of these two factors (10.0 wt% content of NBAG and β-TCP with freezing at −30 °C) a suitable composite scaffold was prepared as a potential bone tissue engineering implant.
研究领域:
生物材料
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组织工程
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高分子科学
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陶瓷材料
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材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xinkuai He,Zhousi Hu,Jingjing Yang,Ruqing Guo,Luye Wu
The co-deposition behavior of Co(II) and Mo(VI) in N,N-dimethylformamide and ethylene glycol system is observed. The result implies that Co–Mo co-deposition is typical induced deposition, while containing ordinary deposition process . Mo(VI) species in the system can suppress the reduction of Co(II) and its effect can be improved as the increase of Mo(VI) concentration, however, Co(II) species can promote the reduction of Mo(VI) and the effect can also be improved as the increase of Co(II) concentration. SEM micrographs indicate that all these films exhibit a fibrous surface morphology with a new fluffy microstructure. XRD pattern reveals that the Co–Mo film is a Mo solid solution in Co and its average size of crystalline grain is 9.5 nm. In addition, the electrocatalytic activity for hydrogen evolution reaction (HER) on these Co–Mo films is investigated. These results indicate that its electrocatalytic activity can be improved as Mo content increases from 1.02 to 2.84 wt% and the prepared Co–Mo film with 2.84 wt% Mo presents a high electrocatalytic activity and stability for HER with an overpotential of 81 mV at 10 mA cm −2 .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhuozheng Hong,Zili Xu,Zhengtao Wu,Hao Zhang,Ping Li,Xun Xu,Shuwang Duo
Tungsten-based nitrides are ideal hydrogen evolution reaction (HER) electrocatalysts owing to their Pt-like electronic structures, high electrical conductivity, and good corrosion resistance. However, the conventional preparation of tungsten-based nitride electrocatalysts suffers from environmentally hazardous sources and high-temperature nitridation processes, which usually restrict HER activity. Herein, we report the direct synthesis of W 2 N on metal–organic framework (MOF)-derived Co-NC microarrays using magnetron sputtering. Co-NC microarray support increased the number of surface activity sites that were exposed to W 2 N. Moreover, the formation of Co-NC@W 2 N Schottky heterojunctions significantly facilitated charge transfer between Co-NC and W 2 N. The Co-NC@W 2 N heterojunctions showed outstanding HER activity with an overpotential of 55 mV in reaching a current density of 10 mA cm −2 . Notably, Co-NC@W 2 N exhibited superior HER performance to Pt/C catalyst at high current densities. This study provides a simple and environmentally friendly approach for fabricating high-performance metal-nitride catalysts for water splitting.
研究领域:
材料科学
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电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 16
·3388
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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
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环境化学
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材料科学
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微波化学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
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2018
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IF 3.956
Qilei Yang,Ang Cao,Na Kang,Kang An,Zhao-Tie Liu,Yuan Liu
The catalyst for direct ethanol synthesis (DES) from syngas was investigated in this work, which is Co/La 2 O 3 -doped La 4 Ga 2 O 9 . The catalyst was prepared by using LaCo 1−x Ga x O 3 with perovskite phase as the precursor to intensify the interaction in the elements of Co, La and Ga. The catalysts were characterized by using XRD , H 2 -TPR, TEM , EDS, XPS , BET, ICP and TG techniques. This catalyst showed high selectivity to ethanol and excellent stability including excellent resistance to sintering and carbon deposition . It seems that the ethanol is generated in the interface between metallic Co and La 4 Ga 2 O 9 , and in the interface cobalt would be positively charged due to the interaction between Co nanoparticles and La 4 Ga 2 O 9 . The results and the related discussions indicate that Co/La 2 O 3 -doped La 4 Ga 2 O 9 catalyst is a promising catalyst for DES from syngas. Graphical abstracts.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Pengcheng Wang,Jun Liu,Peiwen Xu,Xinzhen Feng,Weijie Ji
Three morphologically uniform γ-Al 2 O 3 crystallites [Al 2 O 3 hexagonal plates (Al 2 O 3 -HP), stacked hexagonal plates (Al 2 O 3 -SHP) and rods (Al 2 O 3 -R)] were controllably synthesized. The Co-Mo oxide precursor was loaded on these γ-Al 2 O 3 substrates via aqueous incipient wetness impregnation and transformed to the sulfides under 10% H 2 S/H 2 (v/v) atmosphere. The mainly exposed facet of Al 2 O 3 -HP and Al 2 O 3 -SHP was identified to be the (1 1 0) and (1 0 0)/(1 1 1), respectively; whereas a polycrystalline structure was observed over Al 2 O 3 -R. The original structural feature of oxide precursors, i.e., 2D polymeric/monomeric as well as 3D polymeric/MoO 3 species substantially varied over Al 2 O 3 -HP, Al 2 O 3 -SHP, and Al 2 O 3 -R, which in turn determines the effectiveness in sulfidation of surface oxide precursors. The richness of MoS 2 /Co 9 S 8 /Co-Mo-S species, and less fraction of partially sulphurated CoMoO x S 2 as well as CoO x /SO x 2− entities were recognized over Al 2 O 3 -HP. Based on the areal activity at 250 °C, the sulfides-Al 2 O 3 (1 1 0) interface is approximately 6–13.8 times more active than the poly-crystalline or commercial γ-Al 2 O 3 supported sulfides for water gas shift (WGS) in a hydrogen-rich stream. The sulfides-Al 2 O 3 (1 1 0) interface also notably outperformed the sulfides-Al 2 O 3 (1 0 0)/(1 1 1) interfaces for the reaction.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Zhongming Wang,Xiaoying Peng,Chuyun Huang,Xun Chen,Wenxin Dai,Xianzhi Fu
A series of polyaniline–titanium dioxide (PANI/TiO 2 ) nanocomposite film sensor were fabricated by an in-situ chemical oxidation polymerization of aniline at TiO 2 (anatase) surface, and were evaluated the CO gas sensitivity under UV irradiation at room temperature. Although adding PANI into TiO 2 seemed to weaken the photo-assisted conductivity of film sensor sample at N 2 atmosphere, it enhanced the photo-assisted gas sensitivity to CO. Based on the chemical characterization results of PANI/TiO 2 by FT-IR, Raman and XPS, it is proposed that the protonated N site in PANI chains (formed by TiO 2 interacting with PANI) would promote the adsorption of CO, resulting in the more electrons from CO to PANI by the typical π–conjugated structures of benzenoid and quinonoid units and then to TiO 2 by the hydrogen bonds (N⋯H⋯O) in the interface of PANI and TiO 2 . Moreover, the presence of H 2 O could enhance this photo-assisted gas sensitivity. Furthermore, the PANI/TiO 2 powder sample also exhibited a higher activity of photocatalytic oxidizing CO than the pure TiO 2 sample, indicating that the enhancement in the photo-assisted sensing response to CO would benefit the photocatalytic oxidation of CO over PANI/TiO 2 . This study not only provides a possible approach to develop a photo-assisted gas-sensitive material by introducing the structure of organic-inorganic hybrided nanocomposite, but also provides a possible method to estimate the photocatalytic activity of a semiconductor material by testing its photo-assisted sensitivity to the reactant gas.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
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2023
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IF 4.6
Tiantian Zhang,Jiacheng Xu,Yan Sun,Shiyu Fang,Zuliang Wu,Erhao Gao,Jiali Zhu,Wei Wang,Lianxin Dai,Weihua Liu,Buhe Zhang,Junwei Zhang,Shuiliang Yao,Jing Li
Nano-Au has a good catalytic activity for CO oxidation, but its catalytic mechanism is still not clear. Here, CO oxidation on Au 2 O 3 and its thermal decomposition products were studied using thermogravimetric-mass spectrometry (TG-MS) and operando diffuse reflectance infrared Fourier transform spectroscopy-mass spectrometry (DRIFTS-MS) to explore the key active components of Au catalyst for CO oxidation. The TG-MS results showed that Au 2 O 3 decomposed to AuO at 210 °C and Au at 375 °C and was oxidized to form Au oxide above 375 °C. When Au 2 O 3 decomposed into Au x O y (x>y) above 210 °C, the CO oxidation activity obviously increased. Au atoms in the Au-Au system serve as electron donor and CO adsorption sites. Au atom is oxidized to AuO by the O atom from O 2 decomposition following the Epling-Xu decomposition mechanism. A schematic diagram of the key components of Au 2 O 3 catalysts during CO oxidation was proposed based on TG-MS and operando DRIFTS-MS analysis results.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhiguo Yang,Xingtai Chen,Qiuying Chen,Jiayi Qu,Yujun Guo,Kaiwen Zhou,Tianren Wang,Davoud Dastan,Xiaoning Wang,Feifei Wang,Xiaoming Tan,Xi-Tao Yin,Xiaoguang Ma
In this work, In 2 O 3 nanospheres were synthesized using urea as a carbon template and modified with Co ions. The synthesized materials were characterized using various instruments to obtain information about the elemental composition and morphology of the materials. The results showed that Co ions replaced the lattice position of In ions and synthesized nanospheres aggregated from 20 nm particles. The results of gas sensitivity tests on all the samples showed that the response to 50 ppm n-butanol at 250 °C reached 540 when Co was doped up to 5 at%. In comparison, the sensor showed very low response to benzene gas with good selectivity. The high response of the sensor to n-butanol is due to the increase in vacancy oxygen content and redox reactions due to the multivalent nature of Co ions. The article concludes with a detailed analysis of the sensing mechanism.
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Rongying Zhu,Yaodong Yu,Renqin Yu,Jianping Lai,Joey Chung-Yen Jung,Shiming Zhang,Yufeng Zhao,Jiujun Zhang,Zhonghong Xia
It remains a huge challenge to develop methanol oxidation electrocatalysts with remarkable catalytic activity and anti-CO poisoning capability. Herein, PtIrNi and PtIrCo jagged nanowires are successfully synthesized via a facile wet-chemical approach. Pt and Ir components are concentrated in the exterior and Ni is concentrated in the interior of PtIrNi jagged nanowires, while PtIrCo jagged nanowires feature the homogeneous distribution of constituent metals. The PtIrNi and PtIrCo jagged nanowires exhibit mass activities of 1.88 A/mg Pt and 1.85 A/mg Pt , respectively, 3.24 and 3.19 times higher than that of commercial Pt/C (0.58 A/mg Pt ). In-situ Fourier transform infrared spectroscopy indicates that CO 2 was formed at a very low potential for both nanowires, in line with the high ratio of forward current density to backward current density for PtIrNi jagged nanowires (1.30) and PtIrCo jagged nanowires (1.46) relative to Pt/C (0.76). Also, the CO stripping and X-ray photoelectron spectroscopy results substantiate the remarkable CO tolerance of the jagged nanowires. Besides, the two jagged nanowires possess exceptional activities toward ethanol and ethylene glycol oxidation reactions. This work provides a novel line of thought in terms of rational design of alcohol oxidation electrocatalysts with distinctive nanostructures .
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Hao Xu,Songsong Li,Lei Ge,Changcun Han,Yangqin Gao,Dongsheng Dai
Efficient separation of photo-generated electrons and holes is a crucial aspect for photocatalytic hydrogen evolution . Herein, novel plate-like Co(OH) 2 decorated TiO 2 nanosheets for photocatalytic water splitting were synthesized by a facile in-situ synthetic method. The results of X-ray diffractometry (XRD), transmission electron microscope (TEM), UV–Vis diffusion reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) indicate the successfully incorporation of Co(OH) 2 co-catalysts onto the surface of TiO 2 nanosheet photocatalysts . Further photocatalytic hydrogen evolution experiments illustrate that all Co(OH) 2 decorated TiO 2 samples show higher rate of hydrogen production performance than pure TiO 2 sample and the composite sample with Co(OH) 2 loading amount of 0.5mol% presents the highest photocatalytic hydrogen production activity of 746.93 μmol g −1 ·h −1 . It is indicated that plate-like Co(OH) 2 particle act as an electron collector, which leads to photo-generated electrons transfer from TiO 2 to Co(OH) 2 , and therefore enhance the photocatalytic activity . Based on above results, a possible mechanism is proposed and further verified by surface photovoltage spectra (SPV).
研究领域:
材料科学
·
光催化
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纳米材料
·
能源化学
·
半导体物理
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表面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）