Surfaces and Interfaces
·
2025
·
IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 27
·期 3
·1605011
·
IF 11.382
Yaxiong Yang,Yongfeng Liu,Kaichao Pu,Xing Chen,He Tian,Mingxia Gao,Min Zhu,Hongge Pan
In this study, an amorphous Li 2 CO 3 -coated nanocrystalline α-Fe 2 O 3 hierarchical structure is synthesized for the first time using a facile one-step mechanochemical process at room temperature, taking advantage of the concurrence of repeated fracture-cold welding of material's particles and a gas-solid redox reaction. The conformal coating and hierarchical structure significantly increase the cycling durability and rate capability. Typically, a 1–3 nm thick amorphous Li 2 CO 3 layer is conformally coated on Fe 2 O 3 nanocrystallines (≈10 nm in size) that form hierarchically aggregated particles 400–800 nm in size by ball milling α-Fe 2 O 3 with LiH in CO 2 . The prepared Li 2 CO 3 -coated nanocrystalline α-Fe 2 O 3 exhibits highly stable long-term cyclability as it delivers a reversible capacity of 975 mAh g −1 with 99% of retention after 400 cycles at 100 mA g −1 . At a high rate of 3000 mA g −1 , its reversible capacity still remains at 537 mAh g −1 , superior to the uncoated counterpart (311 mAh g −1 ). Moreover, amorphous Li 2 O and Li 2 CO 3 coatings are also similarly produced on Fe 2 O 3 and NiO nanocrystallines, respectively, representing the general applicability of this mechanochemical approach.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
固态化学
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高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 11
·5757-5764
·
IF 5.503
Wen Zheng,Wanying Bi,Xuenong Gao,Zhengguo Zhang,Wenhui Yuan,Li Li
Owing to the high controllability and regular pore structure, metal–organic frameworks (MOFs) have been considered as promising electrode materials. In this work, we report the synthesis of a nickel and cobalt 1,3,5-benzenetricarboxylate bimetal organic framework (Ni–Co-BTC) using a common solvothermal method, and investigate its electrochemical performance as an anode material for lithium-ion batteries. The Ni–Co-BTC anode shows a high specific capacity of 1242 mA h g−1 at a current density of 200 mA g−1 in the potential window of 0.01–3.0 V versus Li/Li+ along with excellent rate performance (384 mA h g−1 at a current density of 4 A g−1), which could be ascribed to the conjugated carboxylates with a stronger π–π interaction and the synergistic effect of two cations. In addition, the mechanism of Li storage demonstrated that Li+ inserts into (or extracts from) the carboxylate groups and the benzene ring without the direct engagement of metal ions during galvanostatic charge–discharge measurements. More importantly, the Ni–Co-BTC MOF will be regarded as one of the promising anode materials for advanced Li storage.
研究领域:
材料科学
·
电化学
·
能源存储
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高影响因子
FUEL
·
2024
·
IF 6.7
Anqi Li,Xiaoyu Qian,Mengyan Han,Zhichun Li,Xiaobo He,Guofeng Wang
Electrochemical catalytic water splitting is considered as a promising technique for green hydrogen production, and highly active catalysts toward cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) are required, especially bifunctional ones. In this work, the bifunctional catalysts with Co-CoO x @N, O co-doped carbon (NOC) hybrid nanostructures have been prepared via pyrolysis of ZIF-Co with assistance of a small amount of KNO 3 . KNO 3 plays important roles in tuning the inner and the outer structures of Co-CoO x @NOC hybrid nanostructures. The proposed S Ov , which is defined as the content of oxygen vacancy (O v ) per unit surface area of the inner Co-CoO x nanoparticle, and charge transfer resistance ( R ct ) are used as the descriptors of the inner structures, while hydrophilicity (or contact angle) is applied as the main feature of the outer structures. S Ov , R ct and hydrophilicity are well tuned by the fed mass of KNO 3 , and a moderate fed mass is the key to balancing S Ov , R ct and hydrophilicity and further is beneficial to accelerating specific and intrinsic activity for both HER and OER . Thus, the bifunctional HER/OER specific and intrinsic activity is peaked by Co-CoO x @NOC-0.025KNO 3 with a moderate fed mass of KNO 3 of 0.025 g, such as j s-250-HER of 539.22 μA cm -2 BET and j s-350-OER of 129.83 μA cm -2 BET at the HER and OER overpotentials of 250 and 350 mV, respectively, also corresponding to high turnover frequencies of 6.653 and 0.801 s −1 , respectively. The optimal catalyst also has high apparent activity, such as achieving high HER and OER current densities of 500 mA cm −2 , only requiring low overpotentials of 273.1 and 382 mV, respectively. It promotes overall water splitting with a high current density of 500 mA cm −2 at a cell voltage of ∼ 1.63 V, showing the high HER and OER Faradaic efficiencies of ∼ 98.2 and ∼ 98.0 %, respectively.
研究领域:
材料科学
·
电化学
·
催化科学
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2022
·
IF 1.366
Meimei Guo,Zhihua Zhou,Wenjuan Liu,Tianlong Huang,Wei Wu,Jianglong Duan,Meiling Yi,Chao Zhang,Xiao He,Jinxing Chen,Jiaming Gu,Jianjun Fang
Polymer/bioceramic composite scaffolds have gained importance in treating bone defects. In this paper we described a novel degradable scaffold material for bone tissue repairing prepared by combining poly(lactide-co-glycolide-co-ε-caprolactone) (PLLGC) and 1,4-butanediamine-modified poly(lactide-co-glycolide) (BMPLGA) with nano-biaoactive glass (NBAG) and nano β-tricalcium phosphate (β-TCP). The composite scaffolds were characterized by using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The FTIR results indicated that the inorganic fillers of NBAG and β-TCP were successfully incorporated into the PLLGC/BMPLGA matrix. The influences of the inorganic filler content and freezing temperature on the porosity and compressive strength of the composite scaffolds were studied. The composite scaffolds showed an interconnected pore structure with the pore size ranging from 20 to 100 μm depending on the freezing temperature and the inorganic fillers. The compressive strength was enhanced with increasing content of the inorganic fillers and the freezing temperature; however, the porosity decreased. We suggest the PLLGC-BMPLGA/NBAG-β-TCP composite scaffolds have great potential for application in bone tissue regeneration.
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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生物医学工程
·
材料表征
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Jiahui Xu,Jia-qi Bai,Wenjie Si,Yunhai Zhang,Jiazhao Tan,Mengdie Cai,Qin Cheng,Song Sun
Non-noble metals have attracted worldwide attention for the catalytic hydrogenation of halonitrobenzene due to their high activity, low price, and abundance on Earth. However, the construction of effective and stable non-noble-metal catalysts for the selective hydrogenation of halonitrobenzene to haloaniline by a simple method remains challenging. Herein, we report a facile one-pot method for the synthesis of N,S-co-doped mesoporous carbon-supported non-noble-metal catalysts through carbonization of a mixture of metallic precursors and 2-aminothiazole in molten ZnCl2. The prepared Co-NSPC catalyst showed excellent activity and selectivity with a turnover frequency of 84.4 h–1 in the hydrogenation of p-chloronitrobenzene to p-chloroaniline. Furthermore, Co–Nx was found to be the main active site for this reaction on the basis of characterization and experimental data, and the introduction of S promoted the formation of Co–Nx sites. Moreover, the Co-NSPC-800 catalyst can be reused at least four times and applied to the hydrogenation of 10 kinds of halogenated nitrobenzenes with excellent selectivity.
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高影响因子
FUEL
·
2025
·
IF 7.5
Yongpeng Ma,Jianghui Du,Yifei Wu,Haobing Yan,Ruiqi Liu,Xiaojing Zhang,Hongzhong Zhang,Liming Zhou,Wenjun Huang
Among the diverse pollutants emitted from coal-fired and non-ferrous metal smelting flue gas, Hg 0 and CO have emerged as globally concerning environmental pollutants. However, the simultaneous abatement of multiple pollutants remains a critical challenge to be addressed. In this study, cobalt nanoclusters (Co NCs) were anchored on the terminal oxygen of Ti-O on Ti 3 C 2 MXene and formed asymmetric oxygen vacancies Co-Ov-Ti via a one-step hydrothermal method, yielding Co NCs/Ti 3 C 2 MXene with a morphology of hierarchical nanosheet-assembled spheres for Hg 0 and CO catalytic oxidation. Co NCs/Ti 3 C 2 MXene exhibited excellent 44 % and 52 % of Hg 0 and CO simultaneous removal efficiency at the optimal temperature of 250 °C, respectively. DFT calculations combined with energy barrier modeling were employed to investigate the reaction pathways and energy variations during the catalytic oxidation of Hg 0 and CO. Specifically, Hg 0 oxidation follows the Eley-Rideal mechanism, with a rate-determining energy barrier of 2.11 eV, while CO oxidation adheres to the Langmuir-Hinshelwood mechanism, featuring a rate-determining barrier of 0.17 eV. In the co-catalytic oxidation process, competitive adsorption between Hg 0 and CO was observed, primarily manifested as competition for Ov on the catalyst surface. This study provides a novel strategy for the synergistic control of multi-pollutants in industrial flue gas.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 9
·3473-3482
·
IF 2.8
Liu Xiaofei,Wu Yuandong,Mei Dajiang,Wen Shaoguo
The pyrochlore-type material Co 2 Sb 2 O 7 @C was synthesized through high-temperature solid-state reactions. Co 2 Sb 2 O 7 and Co 2 Sb 2 O 7 @C were characterized by PXRD, XPS, SEM, EDS, and BET. At the current density of 200 mA g −1 , the first cycle discharge capacity of Co 2 Sb 2 O 7 @C is 1266 mAh g −1 . After 100 cycles, the specific discharge capacity can still reach 463 mAh g −1 , which is higher than the 76 mAh g −1 of Co 2 Sb 2 O 7 . With the increase in scanning rate, the contribution rate of the Co 2 Sb 2 O 7 @C pseudo-capacitor varies from 69.2 to 92.5%. The electrochemical performance is due to the conversion and alloying reaction of Li 3 Sb, the coating of amorphous carbon, and the contribution of pseudo-capacitance.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
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高影响因子
iScience
·
2022
·
IF 6.107
Meng Wang,Yan Zhang,Wenpo Shan,Yunbo Yu,Jingjing Liu,Hong He
The thermal stability of the catalysts is of particular importance but still a big challenge for working under harsh conditions at high temperature. In this study, we report a strategy to improve the thermal stability of the ceria-based catalyst via introducing Sn. XRD, Rietveld refinement, and other characterizations results indicated that the formation of Sn-Co solid solution plays a key role in the thermal stability of the catalyst. The developed ternary 3%Co/Ce 0.5 Sn 0.5 O 2 catalyst not only exhibits outstanding thermal stability and resistance to SO 2 and H 2 O for soot oxidation from diesel vehicle exhaust but also remains extraordinary thermal stability for CO oxidation. Remarkably, even after thermal aging at 1000°C, it still possessed high catalytic activity similar to that of the fresh catalyst.
研究领域:
催化材料
·
环境科学
·
化学工程
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DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2026
·
IF 5.1
Nan Yang,Yaru Xue,Zehui Ma,Furang Li,Li Dong,Xiaoxuan Yin,Junhao Liu,Fei Wang,Jianye Fu,Xinmei Liu,Yuchao Lyu
The hydrodeoxygenation (HDO) of lignin-derived guaiacol offers an alternative to fossil-based routes for cyclohexanol production. However, the guaiacol HDO involves multiple parallel and sequential reactions, making the control of reaction pathways particularly challenging. In this work, Co-Zn-based HDO catalysts were synthesized using layered double hydroxide (LDH) as a precursor. The Co particle size decreases and electron density increases, while oxygen vacancy (Ov) concentration rises compared to monometallic Co, yielding higher activity and cyclohexanol selectivity. Most importantly, kinetic study reveals that electron density of Co plays a determining role in governing the HDO pathway. The guaiacol hydrogenation mainly follows two pathways over the Co-based catalyst: guaiacol → phenol → cyclohexanol (Pathway Ⅰ) and guaiacol → phenol → cyclohexanone → cyclohexanol (Pathway Ⅱ). Electron rich Co facilitates C aryl -OCH 3 bond cleavage of guaiacol to form phenol. It also selectively enhances adsorption and hydrogenation of aromatic ring while keeps the hydroxyl group intact as confirmed by the DFT calculations, favoring conversion of phenol to cyclohexanol (Pathway Ⅰ) rather than cyclohexanone (Pathway Ⅱ). These findings provide theoretical guidance for the rational catalyst design and regulation of reaction pathways in guaiacol hydrodeoxygenation.
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高影响因子
SYNTHETIC METALS
·
2025
·
IF 4.6
Ran Xu,Man He,Haoyuan Li,Shuangjiang Feng,Yongjuan Wang,Xiaohai Bu,Yuming Zhou
The strategy of customizing MOF-derived electromagnetic wave (EMW) absorbing materials through the construction of precursor size has become a new research direction. While exploring the dimensional adaptability of Co-MOF derivatives in graphene hybrid aerogel for electromagnetic wave absorption is not widely researched, manipulating the compositions and microstructures of EMW absorbing materials has been found to afford superior EMW absorption. Herein, a series of Co-N/C@graphene hybrid aerogel (CNGA) were successfully synthesized by integrating graphene and multi-scale Co-MOF derivatives which are derived from multi-scale Co-MOF precursors. The results displayed the CNGA containing nanoscale Co-MOF derivatives at a 20 wt% filler ratio exhibited the optimal reflection loss (−46.8 dB, 2.7 mm) and the maximum effective absorption bandwidth (5.3 GHz, 2.1 mm). The exceptional EMW absorption properties are credited to the collaborative impact of distinctive loss mechanisms benefited from the small particle size of Co-MOF derivatives in CNGA and appropriate filler ratio. This work demonstrates the correlations between the size of Co-MOF derivatives and electromagnetic parameters of CNGA, and provides a guidance for the development of advanced hybrid aerogel electromagnetic wave absorbing materials.
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高影响因子
FUEL
·
2026
·
IF 7.5
Hang Zhang,Bo Yang,Shihao Zhao,Binbin He,Yun Zu
Cobalt-catalyzed propane dehydrogenation (PDH) has demonstrated considerable potential to surpass commercial Pt- and Cr-based catalysts, while achieving a balance between reactivity and stability remains challenge due to fickle Co speciations. Herein, two Co/SiBEA zeolite catalysts were designed under H 2 and Air atmosphere using dealuminated SiBEA as the support and cobalt(II) acetylacetonate as the precursor. The H 2 -derived catalyst featured the high-polymeric CoO x species onto the surface, delivering a high propylene space–time-yield (STY) of 228.9 kgC 3 H 6 ·kg Co −1 ·h −1 , but deactivated rapidly (k d = 0.175 h −1 ). In contrast, the Air-treated catalyst yielded low-polymeric CoO x clusters confined into zeolite channels, exhibiting remarkable stability (k d = 0.013 h −1 ) with a moderate STY of 156.9 kgC 3 H 6 ·kg Co −1 ·h −1 . Moreover, the catalyst maintained relatively stable operation for 50 h at 550 °C. Mechanistic studies further revealed that the high-polymeric CoO x species promoted hydrocarbon hydrogenolysis via Co-H phase, accelerating coke deposition, whereas the confined CoO x clusters effectively suppressed the formation of aromatic carbon precursors and facilitated propylene desorption. These findings offer a guideline for designing highly active and stable Co-based PDH catalysts.
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高影响因子
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