iScience
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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.
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高影响因子
Catalysts
·
2025
·Vol. 15
·期 4
·322
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IF 4
Xianglong Meng,Ranran Song,Junjie Bian
In this study, natural clay-like silicate minerals were used as precursors to prepare highly acid-catalytic hydrophobic catalysts. A series of sulfonic acid-functionalized attapulgite catalysts, SO3H-APG, were fabricated by the ball-milling–oxidation method. The catalytic performance in the co-liquefaction and co-pyrolysis ofChlorellaand oil shale was investigated. The catalysts were analyzed using hydrophobicity evaluation, TEM, BET, FTIR, and other characterization methods. The SO3H-APG catalysts exhibited good hydrophobicity and dispensability. Sulfonation grafting improved their excellent hydrocarbon conversion activity. According to the GC–MS results, the addition of the SO3H-APG catalysts shifted the co-liquefaction products of microalgae and oil shale towards lower carbon numbers, with the majority of the products concentrated between C5 and C12, and a content of 84.9% in the range of C5–C11, while the content of products in the range of C12–C20 was only 15.1%. In the co-pyrolysis experiments, the addition of the catalysts promoted the thermal decomposition reaction. The synergistic effect between oil shale and microalgae facilitated the production of more hydrocarbon compounds with a higher H/C atomic ratio. The development of this type of catalyst provides an economically favorable approach for the co-conversion of algae and oil shale. The oil shale pyrolysis kinetic diagram shows that adding the APG clay-based catalyst significantly reduces the time for achieving the same conversion rate, especially below 300 °C, where the in situ catalytic effect is most pronounced.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shuilian Cheng,Zhan Cen,Chengyang Tang,Li Xu,Zuofang Yao,Xiaosong Zhou,Qingyou Liu,Shengsen Zhang
Sulfamethoxazole (SMX), as a typical and widely-used antibiotic, its residue in the water environment poses a serious threat to human health and ecological balance. Herein, an environmentally friendly and cost-effective melamine sponge (MS) was utilized as a carrier for the preparation of three-dimensional (3D) porous cobalt and nitrogen co-doped carbon catalysts (Co-N/C) via an impregnation-pyrolysis method. This approach successfully yielded an easily recoverable Co-N/C@MS catalyst. By utilizing this catalyst to activate peroxymonosulfate (PMS), efficient degradation and purification of wastewater containing SMX were achieved. The experimental results showed that the Co-N/C@MS/PMS system achieved 98.39 % degradation efficiency, attributed to the sponge substrate's high pore structure allowing uniform catalyst dispersion. After four cycles, the system remained stable, addressing traditional powder catalysts' recovery and loss issues. Mechanistic studies revealed that C O, pyrrolic N, and Co 2 + are the primary active sites in Co-N/C@MS for PMS activation. Both radical (primarily SO 4 ·- ) and non-radical (mainly 1 O 2 ) pathways contribute to SMX degradation, with the latter pathways playing a dominant role. The optimal design and performance evaluation conducted in this study offer a novel perspective on the application of recyclable flake catalyst materials for persulfate purification of organic wastewater.
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2019
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IF 1.204
Wei Wu,Zhihua Zhou,Wenjuan Liu,Yunhui Zhao,Yanmin Zhao,Tianlong Huang,Xiaofei Li,Jianjun Fang
A random terpolymer of poly(L-lactide-co-glycolide-co-ε-caprolactone) (PLLGC) was synthesized from L-lactide, glycolide and ε-caprolactone. The in-vitro hydrolytic degradation behavior of the PLLGC terpolymer was investigated as a function of the degradation time; the results showed that the degradation rate of PLLGC was lower than that of PLGA due to a reduction in the acidic degradation products. Therefore, we suggest the degradation rate of the PLGA could be controllable by introduction of ε-caprolactone into the PLGA martrix, while the physical properties (mechanical, etc.) were superior to PLGA.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Chao Chen,Xiaohua Deng,Yingjie Deng,Lu An,Yijie Deng,Yuying Zheng,Dai Dang,Xu Yang
Developing high-efficiency bifunctional materials for electro-catalysis and supercapacitors are urgently needed but challenging. Herein, we develop a self-supporting Co–Ni LDH electrode prepared by in-situ growing ZIF-L(Co)@ZIF-L(Co, Ni) on carbon paper followed by a pseudomorphic transformation. The optimized Co–Ni LDH/carbon paper electrodes (CN-2/CP) exhibit excellent electrochemical activity and stability in oxygen evolution reactions (OER) and supercapacitors. The CN-2/CP electrode displays a low overpotential of 230 mV at 10 mA cm −2 and superior stability at 40-h chronopotentiometry for OER. For supercapacitor, the CN-2/CP electrode delivers a high specific capacitance of 1346 F g −1 at 1 A g −1 and maintains a capacitance of 88.5% after 7000 charge/discharge cycles at 20 A g −1 . Based on the physical and chemical characterization results, the high performance originates from the in-situ electrochemical conversion of metal hydroxide , improved conductivity, fast charge transfer at the interface and unique layered cross morphology providing more active sites.
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ChemSusChem
·
2019
·Vol. 12
·期 4
·830-838
·
IF 7.804
Shuai Wang,Haeseong Jang,Jia Wang,Zexing Wu,Xien Liu,Jaephil Cho
Graphical From tannic acid to water splitting : Amorphous Co−P/Co−N−C supported on N, P co-doped porous carbon (Co−P/Co−N−C/NPC) with a large specific surface area and abundant reactive sites is prepared. The material exhibits outstanding catalytic performance for the hydrogen evolution reaction (HER, η =234 mV at 10 mA cm −2 ), oxygen evolution reaction (OER, η =374 mV at 10 mA cm −2 ), and oxygen reduction reaction (ORR, E 1/2 =0.89 V, vs. RHE). It remains a tremendous challenge to develop a low-cost, earth-abundant, and efficient catalyst with multifunctional activities for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). Herein, a facile and scalable avenue was developed to prepare amorphous Co−P/Co−N−C supported on N, P co-doped porous carbon (Co−P/Co−N−C/NPC) with a large specific surface area (1462.9 m 2 g −1 ) and abundant reactive sites including Co−P, Co−N and NPC. The prepared electrocatalyst exhibits outstanding catalytic performance for HER ( η =234 mV at 10 mA cm −2 ), OER ( η =374 mV at 10 mA cm −2 ), and ORR ( E 1/2 =0.89 V, vs. reversible hydrogen electrode). Benefiting from the excellent HER performance and outstanding OER activity, the Co−P/Co−N−C/NPC delivers a current density of 10 mA cm −2 for overall water splitting at a cell voltage of 1.59 V, which is comparable with the IrO 2 –Pt/C couple electrode.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.2
Yuchen Zhang,Yuying Feng,Miao Zhang,Zhiwei Yu,Xian Sun,Li Zhang
The Ni@SNC catalyst was prepared through a two-step pyrolysis-solvothermal method. • Sulfur species selectively etched amorphous carbon layers, exposing more active sites during doping. • Sulfur, as a doping atom, modulated the electronic structure of the active sites and enhanced the CO 2 RR performance. • The Ni@SNC catalyst achieved a maximum FE CO of 94.6%, with a current density of 13.4 mA cm -2 at this point. Utilizing renewable energy to catalyze the reduction of CO 2 into diverse high-value products represents an effective pathway for mitigating carbon emissions. Nickel-based catalysts benefit from natural abundance and low cost. Moreover, their CO 2 activation capability and *CO desorption characteristics can be optimized through rational structural design to modulate the adsorption energy of reaction intermediates. These properties make them viable alternatives to noble metal catalysts. In this study, a two-step method termed “pyrolysis-doping” was employed to synthesize the Ni@SNC catalyst, which consists of small-sized Ni nanoparticles supported on S N co-doped carbon, facilitating efficient electrocatalytic CO 2 reduction reaction (CO 2 RR). In the Ni@SNC structure, the coordination of surface Ni nanoparticles with N generates active sites, while S doping modulates the electronic state of these sites to optimize the adsorption of *COOH and the desorption of *CO. Performance tests indicated that Ni@SNC achieved a maximum CO Faradaic efficiency (FE CO ) of 94.6% at −0.9 V (vs. RHE), with a corresponding CO partial current density (j CO ) of 13.4 mA cm −2 , while exhibiting excellent stability during an extended electrolysis. Various characterizations and experiments have shown that S doping selectively etched the carbon layer, thereby increasing the electrochemically active area (ECSA). Furthermore, S doping modulated the electronic configuration of Ni N sites, enhancing the balance between adsorption and desorption of reaction intermediates. This work thus provides a new design method for creating efficient and stable non-precious metal CO 2 reduction catalysts. Download: Download high-res image (149KB) Download: Download full-size image
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Chen Jianjun,Xiong Shangchao,Liu Haiyan,Shi Jianqiang,Mi Jinxing,Liu Hao,Gong Zhengjun,Oliviero Laetitia,Maugé Françoise,Li Junhua
The spillover of oxygen species is fundamentally important in redox reactions, but the spillover mechanism has been less understood compared to that of hydrogen spillover. Herein Sn is doped into TiO 2 to activate low-temperature (<100 °C) reverse oxygen spillover in Pt/TiO 2 catalyst, leading to CO oxidation activity much higher than that of most oxide-supported Pt catalysts. A combination of near-ambient-pressure X-ray photoelectron spectroscopy, in situ Raman/Infrared spectroscopies, and ab initio molecular dynamics simulations reveal that the reverse oxygen spillover is triggered by CO adsorption at Pt 2+ sites, followed by bond cleavage of Ti-O-Sn moieties nearby and the appearance of Pt 4+ species. The O in the catalytically indispensable Pt-O species is energetically more favourable to be originated from Ti-O-Sn. This work clearly depicts the interfacial chemistry of reverse oxygen spillover that is triggered by CO adsorption, and the understanding is helpful for the design of platinum/titania catalysts suitable for reactions of various reactants.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Kan Liu,Wenli Zhang,Man Tang,Zhipeng Wang,Yanqin Yang,Songzhan Li,Hao Long
The performance of supercapacitors not only depends on the structure of the electrode but also relates to the composition of electrode material. The binder-free integrated electrodes were obtained from NiCo 2 O 4 nanosheets grown on nitrogen-doped carbon and Co aggregation (NC/Co) nanowires through a hydrothermal process and subsequent annealing. The NiCo 2 O 4 @NC/Co composite presents the stereostructure with NC/Co nanowire supports and intertwined NiCo 2 O 4 ultrathin nanosheets. The NiCo 2 O 4 @NC/Co electrode demonstrates excellent electrochemical capacitive performances and cycling stability, where it illustrates a splendid specific capacitance of 1112 F g −1 at 1 A g -1 and maintains around 90.7 % of the maximum capacitance after 5000 cycles. Besides, the functionalized asymmetric supercapacitor (ASC) was fabricated based on NiCo 2 O 4 @NC/Co and NC with KOH-PVA solid electrolyte. The NiCo 2 O 4 @NC/Co // NC ASC possesses a stabilized operating potential range of 1.6 V and retains around 81.1 % retention after 5000 cycles. This makes a great potential for Ni-Co multiple compound electrodes for high-performance energy storage systems.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Qingling Zeng,Wenxiang He,Ning Zhang,Dongcai Guo
Sr 2 SnO 4 :Eu 3+ phosphors were prepared by a co-precipitation combined with hydrothermal method for the first time, and Li + was introduced to improve its luminescence performance. X-ray diffraction analysis determined that Sr 2 SnO 4 :Eu 3+ , Li + phosphors were successfully synthesized. The effects and mechanisms of Li + doping on the luminescence properties of Sr 2 SnO 4 :Eu 3+ were specifically discussed. At 260 nm excitation, the fluorescence spectra of the products were dominated by the 5 D 0 - 7 F 1 characteristic emission peak of Eu 3+ at 598 nm, with the electric dipole transition 5 D 0 - 7 F 2 being distinctly lower than the magnetic dipole transition 5 D 0 - 7 F 1 , indicating that Eu 3+ selectively replaced the highly symmetrical defective sites of Sn 4+ . The luminous intensity and decay lifetime were significantly enhanced through co-doping Li + , which played an essential role as a charge compensator. The optimum doping concentration of Li + was 7%. Finally, the color purity of Sr 2 SnO 4 :Eu 3+ , Li + reached 99.9%, suggesting that it could be developed as a potential orange-emitting material for solid-state lighting.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Feifei Li,Mingyue Wang,Jinming Zhang,Xingtao Lin,Dazhi Wang,Weijie Cai
The design of highly efficient catalysts for CO 2 reforming with ethanol is of great interest due to the serious coke deposition and the sintering of active metal. In this work, sandwich-type Co core@shell catalyst (SiO 2 @Co@CeO 2 ) with Co nanoparticles between SiO 2 core and CeO 2 shell was synthesized by strong electrostatic adsorption method. Interestingly, SiO 2 @Co@CeO 2 catalyst exhibited the outstanding activity/stability toward CO 2 reforming of ethanol in comparison with Co-SiO 2 catalyst. A bi-functional mechanism involving active sites on CeO 2 shell was proposed. Indeed, cobalt nanoparticles between SiO 2 core and CeO 2 shell maintained the high dispersion because of the confinement effect, which supplied a stable Co-ceria interface area where the reaction occurred. In addition, CO 2 could readily react with the O vacancies in CeO 2 shell to form surface oxygen species and CO, which allowed a continuous cleaning of coke. These positive factors could make it as an attractive candidate for dry reforming process.
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高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Huiyuan Cheng,Zihao Fan,Xuemei Wu,Manman Feng,Wentao Zheng,Guangping Lei,Xiangcun Li,Fujun Cui,Gaohong He
Single-atom catalysts (SACs) with well-defined active sites provide an efficient route for catalyzing CO 2 reduction reaction (CO 2 RR). Although enormous attention has been focused on metal-N x moieties, understanding the effect of metal-C coordination and engineering of the hybrid metal-N/C sites have rarely been reported. Herein, we fabricated Co SACs with tunable isolated Co-N 5-x C x ( x = 1, 2, 3) sites supported on porous carbon frameworks. Benefiting from the difference in electronegativity of the coordinated N and C atoms, the CO Faradaic efficiency (FE CO ) enhanced considerably from 54% to 76% and 92% at −0.8 V vs . RHE for Co-N 4 C 1 , Co-N 3 C 2 , and Co-N 2 C 3 , respectively. Further density functional theory (DFT) calculations uncover that the increased ratio of Co-C coordination induced electron enrichment of Co atoms and upper-shift the d -band center to near Fermi level, and thus favorably promotes the electron-donating ability of Co centers and strengthens the adsorption of *COOH.
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