APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Shenghao Zhao,Tianqi Wang,Zhijiao Ji,Yajun Song,Yi Li,Jia Liu,Wenping Hu
Methanol electro-oxidation reaction (MOR) is the kernel of methanol fuel cell. When the multi-step microscopic transformations process of MOR couples and occurs on the same active site, undoubtedly it reduces the probability of reaction and increases the steric hindrance, resulting in slow reaction kinetics and degradation of catalytic performance. In order to decouple the dehydrogenation and CO oxidation in MOR, herein we synthesized the hierarchical catalyst (NiCo/N-TiO 2 @NaOH) with bifunctional spatial distribution, which displayed 73 mA cm −2 at the potential of 1.5 V (vs. RHE) and only 20 % degradation of performance after continuously electrolysis over 40,000 s. Based on analysis of mass transfer and electron transport in hierarchical structure, combining with in-situ mass spectrometry and theory calculation, the high MOR performance of NiCo/N-TiO 2 can be ascribed to the spatial decoupling the MOR reactions including dehydrogenation under synergic effect of Ni/Co and CO oxidation on N-TiO 2 film.
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高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Qifeng Lin,Zeyu Yuan,Dongyi Wang,Wei Wei,Xibin Wang,Wei Han,Lili Wang
The growing problem of limited lithium resource reserves has resulted in increased attention and a corresponding surge in sodium-ion battery (SIB) research. However, SIBs have disadvantages, such as a short cycle life and low energy density. The lack of high capacity and long-cycle stability anode materials are important factors hindering the development of SIBs. In this study, hollow carbon nanospheres were nitrogen-doped, and the zeolitic imidazolate framework-67 was used as a precursor to synthesize cobalt-based layered double hydroxide using the hydrothermal method followed by synthesizing an NHCNS@CoSe 2 @C complex using calcination and carbon coating. In this design concept, the hollow-cavity structure of the carbon nanospheres provided shorter electron diffusion paths and increased stability; the introduction of nitrogen increased the number of defect sites and charge density of the porous carbon materials, which, with the transition metal selenide, enhanced the conductivity of the final product. The resulting carbon-supported anode material, NHCNS@CoSe 2 @C, had an initial stable discharge capacity of 465.6 mAh g − 1 at a current density of 0.1 A g − 1 and maintained a high capacity of 373.8 mAh g − 1 after 100 cycles. Moreover, it exhibited a high rate performance of 285.6 mAh g − 1 at a current density of 5 A g − 1 .
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanwei Zhu,Lang Gan,Jianqiao Shi,Gen Huang,Hongmei Gao,Li Tao,Shuangyin Wang
The structural design and atomic adjustment of the catalyst are the main factors that regulate the intrinsic electrocatalytic activity. Herein, we report a novel and facile strategy of synthesizing three-dimensional porous carbon network by polymer-assisted molding strategy. The porous carbon framework with Co-CoF 2 and carbon nanotubes (PCF@CCFCNT) was directly obtained by the calcination, in which Co-CoF 2 heterojunctions uniformly dispersed in the interconnected holes. Benefiting from the special hierarchical porous morphology, the dual-function catalytic activity of Co-CoF 2 heterojunctions and existence of Co-N x species, the as-obtained PCF@CCFCNT composites exhibit excellent performance in the oxygen evolution reaction (η = 300 mV@10 mA cm −2 ), as well as outstanding oxygen reduction reaction performance in alkaline medium (E 1/2 = 0.852 V, vs RHE). Moreover, as an air electrode in Zn-air batteries (ZABs), PCF@CCFCNT demonstrates a large peak power density of 184 mW cm −2 and superior long-term stability, which is much more stable than the one consisting of commercial Pt/C. This finding not only shows a simple composite design to achieve high-performance ZABs but also may stimulate the rapid development of 3D hierarchical porous electrocatalysts for advanced energy technologies.
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JOURNAL OF THE ENERGY INSTITUTE
·
2020
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IF 4.748
Min Wang,Shupeng Guo,Ming Xia,Jungang Wang,Zhongyi Ma,Bo Hou,Litao Jia,Debao Li
Whether Co-ZrO 2 interfacial sites have a beneficial effect on Co-based Fischer-Tropsch synthesis is still controversial. In this paper, different quantities of Co-ZrO 2 interfacial sites were fabricated by changing the impregnation sequence of Zr added to Co/SiC catalysts. The effect of the Co-ZrO 2 interfacial sites was investigated by nitrogen adsorption, X-ray diffraction (XRD), hydrogen chemisorption (H 2 -TPD), temperature-programmed reduction (H 2 -TPR) and TEM-EDS- mapping analyses. It was found that when zirconium was on the surface of cobalt, more Co-ZrO 2 interfacial sites were formed, and a higher selectivity of long-chain hydrocarbons was observed. In addition, the formation of Co-ZrO 2 interfacial sites significantly increased the conversion frequency of CO. This work is of great significance for understanding the role of Co-ZrO 2 interfacial sites and guiding the design of related catalysts in Co-based Fischer-Tropsch synthesis.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Xiaodan Zhao,Jiahui Wei,Ying Wu,Zuoming Zhou,Guohua Jing
Sulfite autoxidation in combination with the cobalt-based heterogeneous activators, has recently emerged as the efficient sulfate radical (SO 4 •− ) generation process for organic micropollutant abatement in the water and wastewater treatment , yet the sluggish >Co(II)/Co(III) redox cycling currently compromises the efficacy of radical generation and the potential applications. Herein, regarding that the reductive W(IV) species in WS 2 can modulate the >Co(II)/Co(III) redox cycling in the advanced oxidation processes , confinement of cobalt with WS 2 (Co-WS 2 ) is designed and characterized. The Co-WS 2 /sulfite process achieves an ultrafast tetracycline (TC) abatement (∼100 % abatement of TC within 1 min) under circumneutral conditions with lower dosage of sulfite and activator, outperforming the current cobalt-based heterogeneous counterparts. The dominant reactive radicals are identified as SO 4 •− and hydroxyl radical (HO • ), which are quantified to be 9.7 μM and 4.5 μM, respectively. The superior radical generation efficiency and the concomitant TC abatement rely on the excellent redox properties and electron transfer capability of Co-WS 2 . The inter-transformation of >Co(II)/>Co(III) can be accelerated via the involvement of the reductive W(IV) species with the redox-reversibility of the W(IV)/W(VI) couple in the presence of sulfite. The TC degradation intermediates and the corresponding pathways are also proposed according to the ultra-performance liquid chromatography and quadrupole-time of flight mass spectrometry (UPLC-QTOF-MS) analysis. In addition, the influences of the reactant dosage, coexisting anions (HCO 3 − , HPO 4 2− , Cl − and NO 3 − ), humic acid and the various real water matrices on TC abatement are thoroughly explored. Especially, the Co-WS 2 /sulfite process is advantageous owing to the negligible effect of the coexisting anions on the TC abatement. This study provides a novel heterogeneous activator for significantly improving sulfite activation efficacy to achieve the efficient organic micropollutant abatement.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Gonghe Tong,Yanbin Li,Zhigang Wang,Xiaoyao Tan
Micro-tubular protonic ceramic fuel cells (MT-PCFCs) are prominently advantageous in energy conversion and storage , such as intermediate operating temperature, large volumetric power density, and low sealing requirements. Formation of thin and dense electrolyte film and efficient current collection, particularly from the micro lumen, are the primary challenges for preparing high-performance MT-PCFCs. The present work carries out a one-step fabrication of triple-layer hollow fibers (TLHFs) with anodic current collector/graded anode/electrolyte using BaCe 0 · 7 Zr 0 · 1 Y 0 · 2 O 3-δ via the phase-inversion based co-spinning/co-sintering technique. A BaCo 0 · 4 Fe 0 · 4 Zr 0 · 1 Y 0 · 1 O 3-δ based porous cathode is then applied on the TLHF's outer surface to create a complete fuel cell. The resultant single MT-PCFC yields a peak power density of 601.2 mW cm −2 at 700 °C. Furthermore, an MT-PCFC stack is made by bundling seven TLHFs using the porous cathode. With an effective area exceeding 12 cm 2 , the MT-PCFC stack generates a power output of 2.5 W at 700 °C. The stability test lasts for 100 h at 600 °C under 100 mA cm −2 and for next 60 h at varied temperatures from 700 to 600 °C under 200 mA cm −2 . The inventive design of TLHFs facilitates the scale-up of fuel cells, promoting the development of a large-scale MT-PCFC stack or systems.
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JOURNAL OF RARE EARTHS
·
2023
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IF 4.9
Shiyong Xu,Mei Li,Yijun Wang,Caiyun Gao,Rongsheng Xu,Zhiliang Jin
A novel composite photocatalyst for photocatalytic decomposition of water for hydrogen evolution was successfully synthesized by in-situ growth of nitrogen and sulfur co-doped coal-based carbon quantum dots (NSCQDs) nanoparticles on the surface of sheet cobalt-based metal-organic framework (Co-MOF) and graphitic carbon nitride (g-C 3 N 4 , CN). The structure and properties of the obtained catalysts were systematically analyzed. NSCQDs effectively broaden the absorption of Co-MOF and CN in the visible region. The new composite photocatalyst has high hydrogen production activity and the hydrogen production rate reaches 6254 μmol/(g·h) at pH = 9. At the same time, NSCQDs synergy Co-MOF/CN composites have good stability. After four cycles of hydrogen production, the performance remains relatively stable. The transient photocurrent response and Nyquist plot experimental results further demonstrate the improvement of carrier separation efficiency in composite catalysts. The semiconductor type (n-type semiconductor) of the single-phase catalyst was determined by the Mott-Schottky test, and the band structure was analyzed. The conductive and valence bands of CN are −0.99 and 1.72 eV, respectively, and the conduction and valence bands of Co-MOF are −1.85 and 1.33 eV, respectively. The mechanism of the photocatalytic reaction can be inferred, that is, Z-type heterojunction is formed between CN and Co-MOF, and NSCQDs was used as cocatalyst.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Lixia Wang,Jia Huang,Zhiyang Huang,Huatong Li,Tayirjan Taylor Isimjan,Xiulin Yang
Metallic defects can improve catalysts' intrinsic activity by regulating its electronic structure and enhancing conductivity. However, the impact of these defects on the kinetics of the oxygen evolution reaction (OER) has not been extensively studied. Here, a V/P codoped nanoflower-like CoS 2 catalyst with rich Co defects on carbon cloth (V,P-CoS 2 /CC) is fabricated by feasible directional construction. The V,P-CoS 2 /CC validates extraordinary OER performance with overpotentials of 227/300 mV at 10/100 mA cm −2 and robust long-term stability. The enhanced single-electron spin resonance signal and higher lifetime strength indicate an increased number of surface Co defects induced by V/P codoping. Density functional theory (DFT) calculations verify that Co defects induced by V/P codoping of the surface reconstituted V-CoOOH/CoS 2 catalyst can optimize the adsorption/desorption energy of oxygen-containing intermediates to accelerate OER process. Besides, the nanoflower-like morphology with large electrochemical active surface area and good hydrophilicity facilitates electrolyte diffusion/gas emission, thereby synergistically elevating OER performance.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Mengyi Zhang,Xiaohui Sun,Xudong Cai,Xiaolu Zhan,Yufei Wu,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In the field of electromagnetic wave (EMW) absorption, carbon matrix materials based on metal–organic frameworks (MOFs) have drawn more interest as a result of their outstanding advantages, such as porous structure, lightweight, controlled morphology, etc. However, how to broaden the effective absorption bandwidth [EAB; reflection loss (RL) ≤ −10 dB] is still a challenge. In this paper, large microsphere structures of a Co/C composite composed of small particle clusters were successfully prepared by the solvothermal method and annealing treatment. At a filling ratio of 40 wt %, the Co/C composite shows attractive microwave absorption (MA) performance after being annealed at 600 °C in an atmosphere of argon. With an EAB of 6.32 GHz (9.92–16.24 GHz) and a thickness of just 2.57 mm, the minimum RL can be attained at −54.55 dB. Most importantly, the EAB can attain 7.12 GHz (10.88–18.0 GHz) when the thickness is 2.38 mm, which is larger than that of the majority of MOF-derived composites. The superior MA performance is strongly related to excellent impedance matching and a higher attenuation constant. This study provides a simple strategy for synthesizing a MOF-derived Co/C composite with a wide EAB.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Yuqi Yang,Longlong Zeng,Xiaoyan Li,Zaisheng Cai
Glasses such as automobile windshields, mirrors, and lampshades are prone to fogging due to temperature changes, which affects the process of use and even jeopardizes safety. Hydrophilic films can prevent the glass surface from fogging by absorbing condensation droplets. However, the anti-fog film only lasts for a short period because it will gradually dissolve with the moisture increasing, which leads to image distortion. Herein, we propose a hydrophilic/hydrophobic coating to achieve longer anti-fog persistence. The strong interface bonding of the polymer is the key to improving the durability performance of the coating. It prevents interfacial failure and folding caused by fogging conditions. In this paper, a multifunctional coating with good anti-fog and anti-frost properties was prepared using butyl acrylate (BA), acrylic acid (AA) and 4-benzoylphenyl acrylate (BPA) as the polymer monomers . The light transmission of coated glass is up to 90 % even under harsh fogging conditions. The poly(AA- co -BA-co-BPA) can be firmly bonded with the plasma-treated glass plate, which greatly enhances the durability and water resistance of the coating. After being immersed in deionized water for 60 h at room temperature, the coated glass still has a certain anti-fog effect and the light transmittance is maintained at about 85 %. In addition, the anti-fog coating has excellent self-healing properties due to the fact that the carboxyl group in AA can generate hydrogen bonding , so that it can be healed within 15 s with the help of hot water after physical damage. This anti-fog coating has great potential for application in construction, shipbuilding and other industries.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Juan Ma,Weiwei Chen,Junjie Qian,Anze Shui,Bin Du,Chao He
High-performance asymmetric ceramic membranes have shown great potential in wastewater treatment. Nevertheless, high production cost, which results from expensive raw materials, high energy consumption, and complicated preparation process, hinders their large-scale production and application. Herein, a simple and cost-effective co-pressing and co-sintering method was proposed to prepare thin defect-free asymmetric ceramic membranes. This method overcomes the bottleneck of preparing thin asymmetric ceramic membrane by co-pressing. The membrane with a cornstarch content of 20 wt% and sintered at 1300 °C possessed large water permeance (3640 L·m −2 ·h −1 ·bar −1 ), high permeability (steady-state feed permeance > 1000 L·m −2 ·h −1 ·bar −1 ) and selectivity (rejection rate > 99.6%), as well as excellent oil fouling resistance and regeneration performance. The fouling mechanism of the membrane was in accord with cake filtration for the whole separation process (3 h), although multiple fouling mechanisms might occur simultaneously in the initial filtration stage. This study indicates that co-pressing and co-sintering is a quite promising method for fabricating high-performance and cost-effective ceramic membrane.
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Materials
·
2023
·Vol. 16
·期 7
·2606
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IF 3.4
Wei Cui,Jiahui Fang,Yuanyuan Wan,Xueyu Tao,Litong Guo,Qiyan Feng
In this study, an E-fenton oxidation system based on Co-N co-doped carbon nanotubes (Co-N-CNTs) was designed. The Co-N-CNTs system showed fast degradation efficiency and reusability for the degradation of rhodamine B (RhB). The XRD and SEM results showed that the Co-N co-doped carbon nanotubes with diameters ranging from 40 to 400 nm were successfully prepared. The E-Fenton degradation performance of Co-N-CNTs was investigated via CV, LSV and AC impedance spectroscopy. The yield of H2O2could reach 80 mg/L/h within 60 min, and the optimal voltage and preparation temperature for H2O2yield in this system was −0.7 V (vs. SCE) and 800 °C. For the target pollutant of RhB, the fast removal of RhB was obtained via the Co-N-CNTS/E-Fenton system (about 91% RhB degradation occurred during 60 min), and the •OH played a major role in the RhB degradation. When the Fe2+concentrations increased from 0.3 to 0.4 mM, the RhB degradation efficiency decreased from 91% to about 87%. The valence state of Co in the Co-N-C catalyst drove a Co2+/Co3+cycle, which ensured the catalyst had good E-Fenton degradation efficiency. This work provides new insight into the mechanism of an E-Fenton system with carbon-based catalysts for the efficient degradation of RhB.Keywords:carbon nanotubes;E-Fenton;rhodamine B;degradation;mechanism
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高影响因子
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