CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qing-Ting Sun,Bu-De Xu,Jing Yang,Ting-Ting Qian,Hong Jiang
Co-based catalysts can effectively active peroxymonosulfate (PMS) for organic pollutants degradation. However, the loaded Co on porous materials could easily release into the solution during the reaction. Herein, a stable layered double oxide (LDO)-supported Co-Fe bimetal catalyst, i.e., Co 2 FeAl-LDO, was synthesized and used to activate PMS for the degradation of carbamazepine (CBZ, a representative pharmaceutical and personal care product). Results show that Co 2 FeAl-LDO/PMS exhibited high removal of CBZ (>99%) in 30 min with the reaction rate constant ( k obs ) of 0.2103 min −1 . The high activity of Co 2 FeAl-LDO could be caused by the specific structure of the LDO and the synergistic effect of Co, Fe, and Al on the catalyst. The high CBZ removal (88%) at the fifth run of Co 2 FeAl-LDO and the low cobalt release (0.4 mg/L) indicate the high stability of Co 2 FeAl-LDO. The activation and CBZ degradation mechanisms in this highly efficient system were proposed and validated by identifying the radicals and intermediates of CBZ and comparing the active sites on fresh and used Co 2 FeAl-LDO. pH had a significant effect on CBZ degradation. CoOH + and HSO 5 − were the predominant species involved in CBZ degradation under the optimal pH 6.0. The anions and humic acid (HA) inhibited CBZ degradation as they occupied the active sites of the catalyst. This work provides a new substrate to stabilize the active components, and vital information on the synergistic effect of active components during PMS activation.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 6
·974-979
·
IF 1.9
Jian Xin Xie,Wen Jing Chen,Xian Xue Wu,Yun Ying Wu,Hong Lin
It was found that Co–Fe layered double hydroxides (Co–Fe LDHs), other than intercalated LDHs, could catalyze the luminol–H2O2 chemiluminescence (CL) reaction and generate a strong CL signal. The as-prepared Co–Fe LDHs were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Based on the CL spectra, UV-visible absorption spectra and free radical scavenging assay, a possible CL mechanism was proposed. Under optimum conditions, a good linear relationship between the CL intensity and H2O2 concentration in the range of 1.0 × 10−8 to 3.0 × 10−6 mol L−1, with the limit of detection of 5.0 × 10−9 mol L−1, was obtained. Based on the glucose conversion into H2O2 by glucose oxidase, the sensitive detection of glucose could be realized with the limit of detection of 2.0 × 10−8 mol L−1. This proposed method has been applied to the determination of H2O2 and glucose in real samples with satisfactory results.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
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2022
·
IF 4
Jinghao Wu,Shuangshuang Cai,Qiuyu Kong,Meng Chen,Zuanguang Chen
Existing electrochemical sensors generally possess limited sensitivity, which necessitates the use of high-cost materials such as precious metals and enzymes. Therefore, the development of electrochemical sensors that have low synthesis cost, short detection time, simple operating process, high sensitivity and non-precious metals is highly desirable for establishing modern and more efficient electrochemical analysis methods. Herein, we used sodium borohydride reduction method to load Fe and Co onto multi-walled carbon nanotubes (Co,Fe/MWCNT). The successful doping of two metals exposes a large number of active sites in the material and increases the effective area. The morphology and elemental composition of the composite material were determined, and the material was used to modify a glassy carbon electrode for the construction of a hypersensitive electrochemical sensor. Subsequently, the electrochemical behavior of rutin on the constructed sensor was investigated under optimum conditions. The reduction peak current and concentration of rutin were found to exhibit a good linear relationship within the concentration ranges 8 × 10 −4 –8 × 10 −3 µmol/L (R 2 = 0.998), 1 × 10 −2 –0.1 µmol/L (R 2 = 0.996), and 1–200 µmol/L (R 2 = 0.998). The electrode also showed good reproducibility and a low limit of detection of 2.8 × 10 −4 µmol/L (3S 0 /S). Importantly, the sensor was successfully applied for the measurement of rutin content in tablet and urine. Thus, an effective analytical platform for rutin determination during the analysis of real drug and biological samples was developed.
研究领域:
电化学
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材料科学
·
分析化学
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Yuewen Shao,Jie Wu,Zhiyuan Zheng,Mengjiao Fan,Kai Sun,Félix Mérimé Bkangmo Kontchouo,Lijun Zhang,Shu Zhang,Guangzhi Hu,Xun Hu
Production of cyclopentanone (CPO) from biomass-derived furfural is attractive but challenging, as deep hydrogenation or ring-opening of furan ring in furfural over Co-based catalysts hinders the formation of the targeting products. In this study, alloying Co with Fe species in Co–Fe–Al catalysts is proposed for selective conversion of furfural to CPO in water. The formation of CoFe alloy in Co–Fe–Al catalyst weakened the interaction between Co species and the alumina carrier, lowered the adsorption/activation of H 2 , suppressed the formation of especially Brønsted acidic sites, facilitated the electron transfer from Co 0 to Fe species, increased the activation energy for hydrogenation of furfural (from 17.2 kJ mol −1 over Co–Al to 33.4 kJ mol −1 over 1.5Co-1.5Fe-1.0Al), and weakened the adsorption of C C and C–O–C functionalities in furan ring of furfuryl alcohol (FA) on metallic sites. These factors together suppressed deep hydrogenation of furan ring in FA or ring-opening of FA to diols, producing CPO and CPL with total yield of 91.5%, which was attributed to the synergy between hydrogenation and Brønsted acidic sites. In addition, the presence of Fe in Co–Fe–Al catalysts also enhanced the structural stability of Co species, preventing the phase transformation and aggregation of Co species, and rendering the catalyst with superior reusability .
研究领域:
催化化学
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生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Wenxin Li,Bo Yu,Yang Hu,Xinqiang Wang,Bin Wang,Xiaojuan Zhang,Dongxu Yang,Zegao Wang,Yuanfu Chen
Exploring highly efficient, stable and nonprecious electrocatalysts for both hydrogen and oxygen evolutions is greatly desirable for sustainable energy conversion, but still a huge challenge. Herein, we construct a unique three-dimensional (3D) porous electrocatalyst with hollow (Co,Fe)P nanoframes encapsulated into N,P-codoped graphene aerogel (CFP NFs@NPGA) through one-step in situ encapsulation and selective etching, followed by phosphorization. Due to its uniqure 3D porous nanoarchitecture, CFP NFs@NPGA displays superior electrocatalytic performance. As a highly efficient catalyst for hydrogen evolution reaction , the CFP NFs@NPGA catalyst only needs low overpotential of 155 mV to afford 10 mA cm −2 under alkaline condition. Meanwhile, the hybrid reveals remarkable oxygen revolution reaction activity with a small overpotential of 278 mV to afford 10 mA cm −2 in alkaline electrolyte . When adopted as both cathode and anode in overall water-splitting cell, the hybrid requires only 1.59 V to achieve 10 mA cm −2 with nearly 100% faradaic efficiency, and the experimentally measured H 2 and O 2 gas genenaration rates are about 0.18 and 0.09 mmol h −1 , respectively, showing outstanding long-term stability even over 48 h. The present results manifest that the combination of hollow nanostructure and hetero-atom-doped carbon matrix is an effective strategy to enhance water-splitting performance of transition metal phosphides.
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Jiaqi Li,Yidan Zhang,Pingyu Luo,Chun Li,Fanming Zeng,Tiantian Sun,Hanhui Lei,Xiaoteng Liu,Chunbo Liu
Persulphate-based advanced oxidation technology efficiently and cost-effectively removes organic dyes from water but designing stable photocatalytic systems and understanding their reaction mechanisms remain key challenges. Metal–organic frameworks (MOFs) have attracted considerable research attention for degrading organic pollutants owing to their high porosity, tunable structure, and ease of modification. In this study, a series of M-MOF-74 (M = Co, Fe, Ni) photocatalysts are synthesized by a hydrothermal method for methylene blue (MB) degradation. Among them, the Co-MOF-74 photocatalytic synergetic peroxymonosulfate system exhibits high catalytic activity after 30 min of visible light irradiation. MB degradation efficiency reaches 94.8%, and the reaction rate constant is 0.210 min−1, which is approximately 19.44 times higher than the reaction rate constant of the original Co-MOF-74. Compared with Fe-MOF-74 and Ni-MOF-74, Co-MOF-74 exhibits better photocatalytic performance due to the dynamic changes in the valence state of cobalt, which more effectively facilitate the activation of PMS. In addition, this study analyses the possible degradation pathways of MB in water and toxicological evaluations of intermediate products, providing new insights for the effective removal of dyes in water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 3
·667-672
·
IF 4.4
Qiulan Huang,Ruiqin Ren,Jia Li,Muhammad Waqas,Pan Chen,Xiaotian Liu,Dujuan Huang,Zhongyun Yang,Xinglan Peng,Du-Hong Chen,Youjun Fan,Wei Chen
Fabricating highly competent and cost-effective catalysts is essential for promoting the sluggish kinetics associated with the oxygen reduction reaction (ORR). Herein, a new type of Fe, Co decorated porous carbon composite catalyst co-doped with S and N (FeCo–SNC) was prepared by a simple carbonization process. Interestingly, FeCo–SNC inherits not only the pore structure but also the large surface area of the ZIF-67 dodecahedron. Furthermore, the electronic configuration of the two catalytic centers in Fe–N–C and Co–NC was customized. On the basis of synergetic coordination between the two active sites, the fabricated FeCo–SNC showed prior stability for the ORR even after 10 000 cycles of cyclic voltammetry measurement, besides the great limiting current density of 5.99 mA cm−2 and high half potential of 0.856 V (vs. reversible hydrogen electrode), surpassing the commercially available Pt/C catalyst. Moreover, the primary active site of Fe–N–C was regulated, providing the highest catalytic activity for the ORR. This research offers a new perspective on enhancing carbon-based catalysts for the ORR without relying on precious metals and introduces a strategic method for controlling active centers.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2024
·
IF 3.5
Lijuan Ma,Han Wang,Jing Zang,Xinna Wang,Hao Li,Yanwei Li,Yanhui Li
The rational design of efficient, stable, low-cost non-precious metal-based electrocatalysts with enhanced oxygen reduction reaction (ORR) activity has attracted widespread attention. In this study, a novel electrocatalyst, Fe/Co-N-MWCNT, was prepared by in-situ growth of ZIF-8 and Fe/Co-Phen on multi-walled carbon nanotubes (MWCNTs), then pyrolysis under different temperature to obtain optimal one. During the pyrolysis process, the incorporation of Fe and Co facilitated the formation of metal active sites and Fe-Co alloy, thereby promoting electron transfer and enhancing the ORR activity. Compared to Pt/C (E1/2 = 0.854V, JL = 4.90 mA cm-2), Fe/Co-N-MWCNT demonstrated a comparable half-wave potential (E1/2 = 0.812V) and an enhanced limiting current density (JL = 5.37 mA cm-2). Furthermore, Fe/Co-N-MWCNT was stable and showed no significant change after 2000 cycles, with only a negative shift of 7 mV in E1/2. Ampere response testing revealed that the current decay of Fe/Co-N-MWCNT after 10000 s was only about 7.8%, while that of Pt/C was about 18.4%. Due to its excellent catalytic stability, Fe/Co-N-MWCNT was demonstrated to be an excellent candidate for rechargeable zinc-air batteries. The outstanding electrocatalytic performance of Fe/Co-N-MWCNT can be attributed to its high pyridinic nitrogen content, the unique structure and abundant metal active sites.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xin Liu,Liping Yang,Li Chen,Shuxia Li,Peng Li,Yongrong Sun,Ning Kang,Chenglong Wang
It is still challenged to propose a straightforward and in-situ growth method of fabricating perovskite-type metal oxide films with dense and uniform surface coverage. This paper presents a simple strategy to prepare LaBO 3 (where B = Ni, Co, Fe, Mn) films by metal oleate (MO) route, in which metal oleates (La(OA) 3 and (B(OA) x , x = 2 or 3) serve as effective ligands to inhibit the self-aggregation among crystal grains. The as-prepared LaNiO 3 film with uniform and dense surface shows a reduced contact angle (31.5° vs 51.2°) and surface roughness (Ra = 14.2 vs 23.9 nm) compared with film prepared by Sol-gel (SG) method. Finally, the LaNiO 3 film by MO route is successfully employed as hole transport layer (HTL) in perovskite solar cells (PSCs) to obtain a power conversion efficiency (PCE) up to 15.62 %, which is 1.54 times that of PSCs by SG method. This work opens an avenue for fabricating LaBO 3 films with dense and uniform surface coverage by MO route.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhu Xiong,Yuhang Cheng,Kaige Dong,Mahmud Sakil,Zhu Wang,Liguo Zhang,Tangfu Xiao,Gaosheng Zhang,Shuaifei Zhao
Super trace thallium(I) (Tl + ) is still highly toxic and its removal from surface water is challenging. Here, we developed a new adsorptive membrane by immobilizing bimetal (cobalt and iron) Prussian blue analogues (Co@Fe-PBAs) on a polytetrafluoroethylene microporous membrane (Co@Fe-PBAs-M). The prepared membrane displayed precise adsorption of trace Tl + (50 μg/L) from complex water. A variety of interfering factors, such as water pH, competitive adsorption of positive ions (Na + and K + ) and negative ions (CO 3 2– and PO 4 3- ), natural organic matters (e.g., fulvic acid and bovine serum albumin) were evaluated during Tl removal. The composite membrane showed high removal efficiency (over 80 %) during long-term dynamic membrane separation of surface water containing super trace Tl + (<2.0 μg/L), breaking through the adsorption limitation in ultralow concentration of Tl + . The unique bimetal electron transfer of Co@Fe-PBAs-M reinforced the adsorptive performance to Tl + through dual ion exchange and intercalation. In the treatment of real Pearl River water containing 0.5 μg/L of Tl + , our membrane effectively reduced the Tl + concentration to 0.04 μg/L during 6-h continuous separation, which was far below the required level for drinking water (i.e., 0.1 μg/L). This work offers a promising solution for safe drinking water by remedying ultralow Tl + contaminated surface water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Yinshuang Shao,Huipeng Zhao,Ji Wang,Xiaoshuang Zhang,Xiaoqiang Du
Electrocatalytic seawater splitting for generating H 2 has become one of the most promising methods. This study prepared M-NiSe/Ni 3 Se 2 (M = Co, Fe, Cd) electrocatalysts through a one-step hydrothermal selenification reaction. In alkaline seawater, the Co–NiSe/Ni 3 Se 2 electrode requires overpotentials of 273, 369, and 431 mV to drive current densities of 10, 50, and 100 mA cm −2 for oxygen evolution reaction (OER) process, respectively. Moreover, the Co–NiSe/Ni 3 Se 2 electrocatalyst needs only potential of 1.395 V to drive a current density of 10 mA cm −2 in the urea oxidation reaction (UOR) process. According to density functional theory result, the synergistic effect between the large H 2 O adsorption capacity of Co–NiSe and the superior electrical conductivity of Ni 3 Se 2 is a key factor for contributing to the superior performance of the Co–NiSe/Ni 3 Se 2 catalyst. This study conducted systematic doping comparison experiments on the NiSe/Ni 3 Se 2 system, providing authentic and reliable experimental support for the design of selenide electrocatalysts.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Haiying Li,Shishuai Sun,Wen Cui,Xiaolan Li,Chuanjia Kou,Zhihui Xu,Zhihui Zhang
Reasonably regulating the dimensionality and interface of an electrode material can effectively improve its surface chemical reactivity, charge transfer rate, and ion transport performance, which is crucial to solving several problems with supercapacitors , including low energy density and poor cycle stability. The multidimensional hybrid morphology of Co-Fe carbonate hydroxide (CH) coupled with Co-Mn layered double hydroxide (LDH) is generated directly on the nickel foam substrate by a two-stage process. The prepared multidimensional hybrid materials with pore morphology with the synergistic effect of 1D nanorods , 2D nanosheets , and 3D “porous coral” not only ensure sufficient contact between the electrolyte and electrode material but also enhance the charge transfer and ion diffusion of the electrolyte. The strong coupling effect of Co, Fe, and Mn metals between the heterojunction surface can produce various ionic valence states and high conductivities, resulting in increased redox activity, which thus improves the electrochemical performance. The results of the electrochemical performance test show that when the current density is 10 mA cm −2 , the high area-specific capacitance of 7.33 F cm −2 is two times (3.85 F cm −2 ) that of a Co-Fe CH electrode and five times that of a Co CH electrode. The quasi-solid state asymmetric supercapacitor with a Co-Fe-Mn positive electrode and an active carbon negative electrode displays an energy density of 0.723 mWh cm −2 at a power density of 8.53 mW cm −2 . After 5500 cycles, the apparatus exhibits 101.72 % of the initial capacitance, which can effectively drive small electrical appliances. The results indicate that the supercapacitor exhibits excellent cycle stability and application potential in energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）