Catalysis Science & Technology
·
2016
·Vol. 6
·期 14
·5580-5589
·
IF 5.287
Zijian Feng,Jianqiang Wang,Xiao Liu,Yanwei Wen,Rong Chen,Hongfeng Yin,Meiqing Shen,Bin Shan
A series of LaxSm1−xMn2Oδ (x = 0, 0.1, 0.3, 0.5) catalysts were synthesized through a co-precipitation method. The catalytic activity for NO oxidation was enhanced with La substitution, and the maximum activity was achieved at x = 0.3. XRD and HRTEM results revealed the formation of a multiphase oxide as well as the interface structure between the mullite (SmMn2O5) phase and Mn-rich perovskite (La0.96MnO3.05) phase. The main impact of different La/Sm molar ratios is the amount of surface adsorbed oxygen (Oads) and surface Mn4+ ions as revealed by XPS results. The NO oxidation performance was enhanced through La addition by promoting the decomposition of nitrate/nitrite species and desorption of NO2, improving the reducibility of surface adsorbed oxygen, as determined by H2-TPR, NO + O2-TPRD and in situ DRIFTS studies. Mono-, bi-dentate and bridged nitrates formed on the surface were determined to be the primary reaction intermediates.
研究领域:
催化化学
·
材料科学
·
环境化学
·
表面科学
·
无机化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Chen Chen,Yu Liang,Qiong Tang,Dong Li,Lei Liu,Jinxiang Dong
The hydrogenolysis of glycerol to 1,3-propanediol has an important industrial value but remains a great challenge. Herein, a tungsten oxide hydrate (WO3·H2O) containing Brønsted acid sites and surface oxygen vacancies was in situ grown on the surface of alumina. The coordination chemistry of WO3 on the carrier contributes to the extremely dispersed platinum and the excellent acidic property, and much more Pt–O–W interfaces are created. The synthetic Pt/H–WO3/γ-Al2O3 catalyst exhibited much higher catalytic performance for glycerol hydrogenolysis than Pt/C–WO3/γ-Al2O3, in which C–WO3/γ-Al2O3 was routinely prepared by calcining the tungsten precursor (AMT) pre-impregnated on γ-Al2O3. The success for this strategy lies in the pre-control toward the state of WO3 on the support, and several characterization techniques were performed to reveal the structure–property relationship.
研究领域:
催化化学
·
材料化学
·
工业化学
·
应用化学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2020
·
IF 14.612
Xianhua Zhang,Chunlei Pei,Xin Chang,Sai Chen,Rui Liu,Zhi-Jian Zhao,Rentao Mu,Jinlong Gong
Modulating lattice oxygen in metal oxides that conducts partial oxidation of methane in balancing C–H activation and syngas selectivity remains challenging. This paper describes the discovery of distorting FeO6 octahedra in La1–xCexFeO3 (x = 0, 0.25 0.5, 0.75, 1) orthorhombic perovskites for the promotion of lattice oxygen activation. By combined electrical conductivity relaxation measurements and density functional theory calculations studies, this paper describes the enhancement of FeO6 octahedral distortion in La1–xCexFeO3 promoting their bulk oxygen mobility and surface oxygen exchange capability. Consequently, La0.5Ce0.5FeO3 with the highest FeO6 distortion achieves exceptional syngas productivity of ∼3 and 8 times higher than LaFeO3 and CeFeO3, respectively, in CH4 partial oxidation step with simultaneous high CO2 conversion (92%) in the CO2-splitting step at 850 °C. The results exemplify the feasibility to tailor the active lattice oxygen of perovskite by modulating the distortion of BO6 in ABO3, which ultimately influences their reaction performance in chemical looping processes.
研究领域:
材料化学
·
催化化学
·
能源化学
·
无机固体化学
·
化学工程
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2017
·Vol. 19
·期 4
·1175-1181
·
IF 9.125
Qingqing Gu,Guodong Wen,Yuxiao Ding,Kuang-Hsu Wu,Chengmeng Chen,Dangsheng Su
Nanocarbons have been extensively used as metal-free alternatives to metal catalysts in many oxidative processes owing to their functional groups or defects, which have the activation ability toward oxygen molecules. Herein, reduced graphene oxide (rGO) could be used as catalysts in oxidative desulfurization reactions for the first time to remove sulfur-containing compounds from fuels. Superior catalytic activity and stability are obtained in the aerobic oxidative desulfurization process catalyzed by rGO. A broad range of sulfur-containing aromatic substrates could be removed effectively in this catalytic system. Carbonyl groups have proved to play crucial roles during the oxidation process based on an XPS analysis, a chemical titration method and a series of comparative experiments. The chemically active defects are also beneficial to the catalytic performance because carbonyl groups could be generated in situ on these defects under the reaction conditions. Based on the EPR results, a radical pathway is proposed. Oxygen molecules could interact with the carbon atoms adjacent to carbonyl groups to form adsorbed super oxygen anion radicals (rGO-OO˙−), which then attack the adjacent sulfur-centered cation radicals and generate the final product sulfone.
研究领域:
纳米碳材料
·
催化化学
·
燃料净化
·
环境催化
·
表面化学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 25
·16785-16794
·
IF 4.123
Wei Xia,Jun Zhao,Tao Wang,Li Song,Hao Gong,Hu Guo,Bing Gao,Xiaoli Fan,Jianping He
Polymer networks such as those of epoxy resin, as common protection materials, possess radiolytic oxidation degradation effects under gamma irradiation environment, which have a great accelerating effect on the ageing rate and severely limit their potential applications for metal protection in the nuclear industry. To overcome this, we report a simple scheme of anchoring crystalline ceria nanoparticles onto graphene sheets (CG) and incorporate it into the epoxy resin, followed by thermal polymerization to obtain CeO2/graphene-epoxy nanocomposite coating (CGNS). We had proven that graphene might act as “interwalls” in the epoxy matrix, which will result in space location-obstruct effect as well as absorb the radicals induced by γ-ray irradiation. Moreover, owing to the interconversion of cerium ions between their +3 and +4 states coupled with the formation of oxygen vacancy defects, electron spin resonance (ESR) detection shows that CeO2/graphene (CG) could act as a preferable radical scavenger and achieve better performance in trapping radicals than single graphene based composite. Electrochemical data strongly demonstrate that CeO2/graphene is capable of maintaining the anti-corrosion properties under gamma irradiation environment. Therefore, the designed hybrid CeO2/graphene-epoxy composite can be considered as potential candidates for protective coatings in nuclear industry.
研究领域:
材料科学
·
核工业防护
·
高分子化学
·
纳米复合材料
·
电化学防腐
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 7
·6376-6385
·
IF 9.5
Cao Fangjun,Feng Hui,Yao Jiaxin,Hou Xiang,Jin Tiezhi,Hui Junfeng
The continuous inflammatory response in diabetic skin wounds leads to excessive production of reactive oxygen species, which cause a vicious circle of long-term inflammation. In the therapeutic research of metal nanoenzymes for healing diabetic ulcers, it still faces the challenges in poor nanoenzymes activity and low-efficient therapeutic efficiency. Herein, ultrasmall oxygen-deficient MoO 3− X quantum dots were fabricated and employed as nanoenzymes for healing fiabetic ulcers. After PEGylation, PEGylated MoO 3− X quantum dots (MoO 3− X /PEG) with oxygen vacancies exhibits excellent photothermal, peroxidase/catalase-like activities. In addition, these MoO 3− X /PEG showed superior properties in scavenging H 2 O 2 and effectively inhibiting the scavenging of reactive oxygen species. More importantly, such an oxygen-defected MoO 3− X /PEG had obvious antibacterial and skin repairing effects on alleviating hypoxia and excessive oxidative stress even in a mouse model of diabetic ulcers, inhibiting proinflammatory cytokines and significantly accelerating the healing of infected wounds, which shows great application potential for promoting wound healing. This work highlights that the developed oxygen defected molybdenum oxide compounds capable of peroxidase-like and catalase-like activities show great application potential for healing diabetes wound.
研究领域:
纳米技术
·
酶模拟物
·
糖尿病研究
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伤口愈合
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Kailing Sun,Mingrui Liu,Siyan Yu,Huiyu Song,Jianhuang Zeng,Xiuhua Li,Shijun Liao
The Li–O 2 battery is one of the most promising next-generation energy storage systems due to its super-high theoretical energy density . However, its further development is impeded by the current cathode system, which exhibits low energy efficiency and poor cycling stability. Herein, we report a composite of vanadium nitride coated with nitrogen-doped carbon nanoribbons grown in situ on carbon paper (denoted as VN@C) as a novel binder-free cathode for Li–O 2 batteries. We find that the nitrogen-doped carbon coating can significantly improve the stability of VN and enhance the composite's ORR/OER activities. The Li–O 2 batteries with our optimal VN@C-850 cathodes achieve an initial discharge capacity of 8269 mA h g −1 , a discharge-charge voltage gap of 0.88 V, and considerable cycling stability for 183 cycles with a cut-off capacity of 1000 mA h g −1 , compared with 2027 mA h g −1 , 1.21 V, and 12 cycles with uncoated VN cathodes.
研究领域:
电化学
·
能源材料
·
纳米材料
·
电化学储能
·
先进电池技术
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2020
·Vol. 63
·期 7
·1182-1195
·
IF 6.098
Wang Yiyan,Zhang Guoxin,Ma Mang,Ma Yan,Huang Jiankun,Chen Chen,Zhang Ying,Sun Xiaoming,Yan Zifeng
An atomically dispersed FeCo-NC material with the 3D flower-like morphology was used as a unique substrate for the controllable deposition of ultrasmall NiFe layered double hydroxide nanodots (termed as NiFe-NDs) to simultaneously promote the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The size-limiting growth of NiFe-NDs (~4.0 nm in diameter) was realized via the confinement of the 3D flower-like mesoporous structure and the rich N/O functionality of FeCo-NC. Benefiting from the distinctive structure with the simultaneously maximum exposure of both OER and ORR active sites, the NiFe-ND/FeCo-NC composite showed an ORR halfwave potential of 0.85 V and an OER potential of 1.66 V in 0.1 mol L −1 KOH at 10.0 mA cm −2 . In-situ Raman analysis suggested the activity of OER was derived from the Ni sites on NiFe-ND/FeCo-NC. Moreover, the NiFe-ND/FeCo-NC-assembled Zn-air battery (ZAB) exhibited a very small discharge- charge voltage gap of 0.87 V at 20 mA cm −2 and robust cycling stability. Furthermore, the NiFe-ND/FeCo-NC composite was also applicable for fabricating all-solid-state ZAB to power wearable electronics with superior cycling stability under deformation. Our work could enlighten a new applicable branch of atomically dispersed metal-nitrogen-carbon materials as unique substrates for fabricating multifunctional electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源存储
·
催化化学
·
纳米科技
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ranxi Liang,Chaozhu Shu,Anjun Hu,Minglu Li,Zhiqun Ran,Ruixin Zheng,Jianping Long
The sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics greatly limit the development of lithium-oxygen (Li-O 2 ) batteries. Therefore, developing efficient electrocatalysts with high stability to boost oxygen involved reactions is particularly important for promoting the application of Li-O 2 batteries. Here, CoSe 2 @NiSe 2 heterostructure with distinct heterogeneous interfaces was fabricated via deliberate interface engineering. The formation of heterogeneous interface promotes local fine atomic array distortion that can act as an additional active site of ORR/OER. In addition, CoSe 2 @NiSe 2 with a distinct heterogeneous interface is favorable for the formation of built-in electric field during charging/discharging to enable electrodes with fast electrical transfer rates and reaction kinetics. Synergistically, the additional active sites brought by the fine atomic array distortion are highly conducive to the reversible formation and decomposition of the product. Undoubtedly, batteries with CoSe 2 @NiSe 2 exhibit excellent discharge/charge capacity (3530.1 mA h g −1 and 3485.6 mA h g −1 ), low overpotential (1.21 V) and excellent electrochemical stability for over 1200 h.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米催化
·
电池技术
✓ 已验证
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2024
·Vol. 155
·期 11
·1119-1124
·
IF 1.7
Fang Chao,Ma Kai,Li Zixu,Wang Fei,Jia Qiang,Chu Changhu
A highly efficient, low-cost Cu-based catalytic system has been developed, which utilizes a combination of charcoal-supported Cu 0 nanoparticles and pyridine as a catalyst for the aerobic oxidation homocoupling of terminal alkynes. This system facilitates the smooth aerobic oxidation of a series of terminal alkynes using oxygen as the oxidant, which results in the formation of corresponding 1,3-conjugated diynes, and water is the sole byproduct. Furthermore, the catalyst has demonstrated good reusability, maintaining its performance for up to five cycles. Graphical abstract
研究领域:
催化
·
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xingwei Zhou,Jianchen Li,Haibin Ma,Yanbin Qu,Yuhuan Cui,Zhili Wang,Qing Jiang
The development of non-noble metal-based electrocatalysts with high efficiency for the oxygen evolution reaction (OER) is of great importance for the practical application of electrocatalytic water splitting. Herein, we have synthesized tri-metal-based FeMoV oxide nanosheets on three-dimensional nickel foam (FeMoV/NF) for the OER by a simple hydrothermal method. Thanks to the decreased charge-transfer resistance and modified electronic structure, the optimized Fe0.5Mo0.1V0.4/NF electrode exhibits excellent OER performance with a low overpotential of 296 mV to deliver a current density of 100 mA cm–2 and a small Tafel slope of 48.9 mV dec–1 in a 1 M KOH solution; both values are much lower than those of commercial RuO2 supported on nickel foam (392 mV and 129 mV dec–1, respectively). This work may provide a promising strategy for the design of highly efficient and low-cost electrocatalysts for the OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 19
·195708
·
IF 3.874
Xuewen Xia,Junqi Li,Chaoyi Chen,Yuan-Pei Lan,Xisong Mao,Fusheng Bai
Morphological tuning or additional cation doping is one of the potential and simple methods to enhance the photocatalytic properties of ceria, in which rare-earth element doped ceria nanorods (CeO2-RE NRs) are expected to be a promising photocatalyst with high activity. But the optimal doping conditions, including the variety and concentration of RE elements are ambiguous, and the contribution of doped RE ions to the enhancement of photocatalytic activity needs to be further studied. In this work, we doped La, Y and Sm with a wide range of 0%–30% into CeO2 NRs, and investigated the phase, morphology, band gap, oxygen vacancy concentration, PL spectra and photocatalytic activity variation under different doping conditions. All synthesized CeO2-RE NRs possessed a good nanorod morphology except the 15 and 30% Y-doped samples. The energy band gaps of the synthesized samples changed slightly; the 10% CeO2-RE NRs with the narrowest band gaps possessed the higher photocatalytic performance. The most outstanding photocatalyst was found to be the 10% Y-doped CeO2 NRs with a methylene blue photodegradation ratio of 85.59% and rate constant of 0.0134 min−1, which is particularly associated with a significant higher oxygen vacancy concentration and obviously lower recombination rate of photogenerated e−/h+ pairs. The doped RE ions and the promotion of oxygen vacancy generation impede the recombination of photogenerated carriers, which is proposed as the main reason to enhance the photocatalytic property of CeO2.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）