APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Min Li,Chenlong Zhang,Jie Dou,Chi Jiang,Yingli Wang,Qiyao Guo,Xinyu Zhang,Bin Dong,Qunwei Tang
Constructing ultra-high activity, highly efficient and robust oxygen evolution reaction (OER) electrocatalysts, especially at large current density, plays a key role in the development of the electrolytic water industry but remains challenging. Highly dispersed alloy compound with large electrolyte contact area and excellent internal conductivity is considered as a kind of ideal candidate. Here, we have rationally designed and synthesized a nickel-platinum alloy with octahedral structure loaded on the surface of the carbon layer (NiPt/C). Under the in-situ modulation of the iron-containing electrolyte, the Fe modified NiPt/C catalyst displays an amazing OER activity in 1 M KOH, and only requires low overpotentials of 183 and 242 mV to reach 100 and 1000 mA cm −2 , respectively. The comprehensive characterization analysis and property measurements reveal that the pre-oxidation of Pt at OER potential contribute to the rapid production of nickel hydroxide, thus promoting the deposition of more iron active sites on its surface. Moreover, the Pt/C/CP (−) //NiPt/C/CP (+) couple embedded in anion-exchange membrane water electrolyser also displays a low cell voltage of 2.03 V at 1000 mA cm −2 with significant electrochemical stability, which endows it a great potential in the field of hydrogen production and electrochemical energy storage.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Xu Pengfei,Ma Haiming,Shen Wenjuan,Quan Fengjiao,Li Jianfen,He Yun
Ammonia (NH 3 ) can be used as a fertilizer, a chemical or a new generation of fuel and has important agricultural and industrial value. Electrochemical NO 3 – -to-NH 3 (NITRR) can realize the conversion of waste into treasure and waste resources, which is a promising method for ammonia synthesis. However, the process of NITRR is very complicated, resulting in product diversification and poor selectivity. In this work, an iron modified cerium oxide in rod form (Fe/CeO 2 -rod) catalysts was designed and used for the NITRR. The Fe/CeO 2 -rod catalyst showed excellent activity, and achieves high Faradaic efficiency (FE 95%) and NH 3 yield rate (4.04 mg h –1 cm –2 ) in 0.1 M KOH electrolyte at – 0.52 V versus reversible hydrogen electrode. Furthermore, this catalyst exhibits a negligible activity decay during continuous electrolysis for 25 h. Further experiments provide the important role of Fe, which promote the formation of hydrogen radicals (H*). This study may provide new pathways to improve the activity of inexpensive catalysts for NITRR. Graphical Abstract
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Shenyu Wang,Junjie Zhang,Ying Zhang
Graphical The CoO@Co core-shell catalyst, 7Co-0.2Fe/CeO 2 , efficiently catalyzes the hydrogenation and ring-opening of furfural to 1,5-pentanediol, with a high productivity of 54.76 mmol/g Co /h, representing the top activity level among the reported catalysts. The addition of Fe optimizes the Co 2+ /Co 0 ratio, improves substrate adsorption, and prevents the formation of tetrahydrofurfuryl alcohol, a saturated furan byproduct. In the conversion of furfural using non-noble metal catalysts, preferential cleavage of the C2−O bond followed by hydrogenation of the C=C bond facilitates selective access to valuable 1,5-pentanediol (1,5-PeD). Herein, we developed CeO₂ loaded core-shell CoO@Co nanoparticle catalysts. Adjusting Co loading, Fe doping, and reduction temperature improved reaction efficiency. 7Co-0.2Fe/CeO₂ catalysts reduced at 500 °C demonstrated optimal performance. 1,5-PeD produced at 54.76 mmol/g Co /h, representing the top activity levels among the reported catalysts. H₂-TPR, XRD, HAADF-STEM, FT-IR, XPS, and XANES were employed to investigate the catalyst structure-activity relationship. Co 2+ cleaves furan ring C−O bond, Co⁰ promotes double-bond hydrogenation. The CoO@Co structure favors the desired 1,5-PeD production route. Trace Fe species optimize the Co 2+ /Co⁰ ratio, enhance the substrate adsorption, and inhibit the furan ring saturation. These findings emphasize the importance of fine-tuning catalyst structure and composition for selectivity improvement.
研究领域:
化学工程
·
催化科学
·
可再生资源转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Jun Li,Jia Fang,Peng Ye,Deming Wu,Mangye Wang,Xiaoxia Li,Aihua Xu
Graphitic carbon nitride (g-C 3 N 4 ) can be used as catalysts for peroxymonosulfate (PMS) activation and pollutants degradation under visible light irradiation. However, its efficiency is relative slow in comparison with copper and cobalt oxide catalysts. In this study, iron oxide modified g-C 3 N 4 catalysts (Fe 2 O 3 /g-C 3 N 4 ) were prepared by a simple thermal treatment method using urea and ferric nitrate as precursors. The materials were thoroughly characterized by a variety of techniques and their activity was evaluated for degradation of Acid orange 7 (AO7) and other dyes under visible light irradiation in the presence of PMS, with nearly complete degradation of all the pollutants obtained within 40 min. The prepared Fe 2 O 3 /g-C 3 N 4 catalysts were also proved more efficient than the single components and were stable during multiple runs. The enhanced photoactivity can be attributed to 1) the higher surface area, supplying more surface active sites and making charge carriers transport easier; 2) improved optical properties with narrower band-gap energies and increased visible light absorption efficiency, and 3) the participation of iron species in the reaction with production of more radicals. Thus, the low cost Fe 2 O 3 /g-C 3 N 4 composites with a facile synthesis process are very promising photocatalysts for PMS activation and pollutants degradation.
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
CARBON
·
2024
·
IF 10.5
Tie Ma,Dan Li,ChenQi Wang,Ning Liu,Chao Wang,GuangPing Wu,Li Guo
Hard carbon materials are preferred as anode materials for sodium-ion batteries due to their abundance, low price, and environmental friendliness. However, doping-based modification usually induces low initial coulombic efficiency (ICE), which seriously affects the practical application of carbon materials. In this work, Fe-modified N/S co-doped porous carbon is prepared using the salt template method. Fe, N, and S are uniformly distributed on the porous carbon to form an interwoven network structure, providing abundant active sites. Moreover, during the electrochemical reaction, FeN x effectively catalyzes the generation of solid electrolyte interface (SEI) film, which reduces the consumption of Na + in the side reaction, leading to a high initial coulombic efficiency, and at the same time, the stabilized SEI film accelerates the diffusion of electrons and ions, effectively enhancing the multiplication rate performance. The NFSC exhibits a high specific capacity (371.3 mAh/g) by the co-coordination strategy and a high ICE (85.9 %). This study provides new ideas for research based on the modification of carbon materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Wei Wang,Yunlei Zhong,Xinyu Zhang,Sainan Zhu,Yourong Tao,Yanxin Zhang,Hongsen Zhu,Yifei Zhang,Xingcai Wu,Guo Hong
Surface self-reconstruction by the electrochemical activation is considered as an effective strategy to increase the oxygen evolution reaction (OER) performance of transition metal compounds. Herein, uniform Co 2 (OH) 3 Cl microspheres are developed and present an activation-enhanced OER performance caused by the etching of lattice Cl − after 500 cyclic voltammetry (CV) cycles. Furthermore, the OER activity of Co 2 (OH) 3 Cl can be further enhanced after small amounts of Fe modification (Fe 2+ as precursor). Fe doping into Co 2 (OH) 3 Cl lattices can make the etching of surface lattice Cl − easier and generate more surface vacancies to absorb oxygen species. Meanwhile, small amounts of Fe modification can result in a moderate surface oxygen adsorption affinity, facilitating the activation of intermediate oxygen species. Consequently, the 10% Fe-Co 2 (OH) 3 Cl exhibits a superior OER activity with a lower overpotential of 273 mV at 10 mA cm −2 (after 500 CV cycles) along with an excellent stability as compared with commercial RuO 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Xiao-Hui Shi,Shi-Jie Wu,Wei-Min Xie,Xue-Lin Li,Qing-Yun Liu,Jimena De La Vega,De-Yi Wang
The requirement of high-efficiency flame retardants for epoxy (EP) resin is urgent due to its high flammability. Herein, a hybrid architecture (LDH@PZE-Fe) was synthesized via intercalation by surfactant and interfacial modification by ferric decorated and amino groups-containing polyphosphazene (PZE) to enhance the fire safety and smoke suppression of EP. With the introduction of 2.5 wt% LDH@PZE-Fe, EP/LDH@PZE-Fe achieved UL-94 V-0 rating with a LOI value of 27.5%. Moreover, EP/LDH@PZE-Fe performed superiorly in inhibiting the release of heat and smoke. Such high-efficiency flame-retardancy was ascribed to the combined action both in condensed and gaseous phases, which was verified by analyzing the morphology and structure of the char layer and the composition of pyrolysis gases. Additionally, EP/LDH@PZE-Fe exhibited satisfactory impact strength and enhanced glass transition temperature due to the good compatibility of LDH@PZE-Fe with EP matrix. Therefore, the flame-retardant EP composites had potential applications as highly flame-retardant materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chang Liu,Long Yan,Lulu Zhu,Yang Yu,Yuehui Tai,Yunjiang Yu,Qifeng Liu,Liangzhong Li
As the most commonly used flame retardant , the mass production and use of TBBPA have caused extensive environmental pollution, and its green and efficient degradation was a key challenge for current research. Hence, we synthesized a pure silica-based Mobilization Filter (MFI) molecular sieve doped with Fe atoms (Fe@S-1) for peroxydisulfate (PDS)-activated degradation of TBBPA. The Fe@S-1/PDS system showed excellent removal efficiencies for TBBPA with removal ratios ranging 98.9 % and k values 0.497 min −1 . Characterization analysis proved that the Fe@S-1 have mesoporous structures with intergranular and intragranular interconnections with nanoconfinement effect, the in situ incorporation through the synthesis process of abundant highly dispersed and valency-controlled framework Fe(II)/(III) species can achieved rapid activation of free radicals . In the spatial confinement mediated fenton-like reaction system, the enhanced utilization of oxidative free radicals and also exhibited remarkably higher reaction kinetics (6.05 times faster) toward TBBPA than its nonconfined analog. In addition, the catalyst showed good catalytic stability in the cyclability test, no significant loss of activity and minimal metal leaching were shown in a 96 h run. Finally, TBBPA degradation capacity of the catalyst was evaluated under the influence of common anions and in the actual water body and the possible degradation pathways of TBBPA were proposed. This work provided a new idea for the design of structurally doped catalysts for TBBPA degradation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·462
·
IF 4
Weijie Chen,Bingbing Zhang,Hao Pu,Zhao Yang,Yixue Qin,Mingze An,Chengtao Gao,Kang Mao,Sheng Wang,Bing Xue,Caiyuan Sun
Tetracycline (TC) contamination in wastewater presents a significant global environmental challenge, with conventional water treatment methods often proving ineffective at eliminating antibiotic pollutants. As a result, there is an urgent need for cost-effective and efficient remediation technologies. In this study, we utilized the abundant and low-costEichhornia crassipesas a precursor to prepare sulfuric acid-modified functional biochar (SC-Fe) through a two-step pyrolysis process. This SC-Fe was then employed to activate peroxydisulfate (PDS) for the removal of TC from wastewater. The structural and physicochemical properties of SC-Fe were extensively characterized, and its efficiency in activating PDS for TC degradation was evaluated. The results demonstrated that the SC-Fe/PDS system effectively removed 99.36% of TC within 60 min under optimal conditions (0.3 g/L SC-Fe, 5 mM PDS, initial pH 7.09, and 25 °C). The outstanding removal efficiency can be attributed to the high specific surface area, large porosity, and defect-rich structure of SC-Fe. Furthermore, during the TC removal process, the SC-Fe/PDS system generated SO4•−, •OH, and1O2, with SO4•−and •OH acting as the primary reactive species. The high catalytic efficiency and low consumption of the SC-Fe/PDS system present a promising strategy for effective wastewater treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Hongyan Tang,Xuebin Wang,Caiyan Wang,Tiantian He,Jincheng Wang
A composite soil conditioner based on Fe-doped hydroxyapatite/polydopamine/amino carbon nanotubes (Fe-HAP@PDA@CNT-NH 2 ) was prepared for controlling release of flavic acid (FA) fertilizers and for the treatment of soil contaminants methylene blue (MB). Firstly, Fe-doped hydroxyapatite (Fe-HAP) was prepared by hydrothermal method. Then, Fe-doped hydroxyapatite/polydopamine/aminocarbon nanotube (Fe-HAP@PDA@CNT-NH 2 ) composite was prepared by in situ polymerization of dopamine (DA) with amino carbon nanotubes (CNT-NH 2 ) on the Fe-HAP surface. Finally, Fe-HAP@PDA@CNT-NH 2 @FA composite soil conditioner was obtained by loading with FA. Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were applied to analyze the composition and morphology of the composites. The loading and slow release experiments showed that Fe-HAP@PDA@CNT-NH 2 owned good loading efficiency on FA and had a wide applicability with different fertilizer slow release effects in different pH environments. Adsorption experiment revealed that Fe-HAP@PDA@CNT-NH 2 possessed high adsorption capacity for MB under different pH conditions. The pseudo-second order and Langmuir models discussed above can be utilized to describe the adsorption mechanism utilizing kinetic and isothermal adsorption models. In addition, the plant experiment also proved the effect of the composite soil conditioner on soil and plants. Hence, the new composite soil conditioner has a great promoting effect on soil improvement and crop growth.
研究领域:
环境科学
·
材料科学
·
农业科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuran Li,Zhicheng Xu,Jian Wang,Bin Wang,Tingyu Zhu
Activated carbon exhibits a high adsorption capacity for chlorinated volatile organic compounds (Cl-VOCs), while the desorption of Cl-VOCs is not desirable in the thermal regeneration progress of activated carbon. Chlorobenzene was selected as the model substance to explore whether Cl-VOCs can be oxidized as expected in the regeneration atmosphere of O 2 -free at the temperature range of 150–450 °C. The modification of activated carbon by Cu or Fe has been shown to considerably improve the decomposition activities. According to the breakthrough curves and detection results from XPS and in situ DRIFTS, the decomposition mechanism of C 6 H 5 Cl on Cu and Fe active sites is illustrated. The adsorbed C 6 H 5 Cl is firstly dechlorinated to form C 6 H 6 and *Cl, and then it was found there are two pathways for the C 6 H 6 oxidation. C 6 H 6 is indirectly oxidized to form C 6 H 5 OH and benzoquinone species, or directly ring-opened to generate ethylene and 1,3-butadiene, and further oxidized to produce CO 2 , CO and H 2 O. The C 6 H 6 oxidation is determined by the decomposition of acetate on Cu/AC, but the decomposition of benzoquinone and maleate on Fe/AC. The Fe 3 O 4 and Fe 2 O 3 active sites have a higher dechlorination activity but accelerate the deposition of FeCl 2 , FeCl 3 and organic Cl-containing components. The CuO active center has a higher oxidation performance with a higher CO 2 selectivity. About 83.0–83.5% of adsorbed chlorobenzene has been oxidized, and the main Cl-containing product is HCl accounting for approximately 77.8–81.0%, a small amount of Cl forms polychlorinated organic compounds or metal chlorides occupying 2.0–5.7%. As the regeneration temperature decreases, the total amount of Cl-containing species is reduced due the lower oxidation and dechlorination activity of catalysts. The decomposition products of Cl-VOCs in the thermal regeneration process of activated carbon were clarified and quantified, which provides a theoretical basis to control Cl-VOCs in regeneration gas.
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
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yingjie Zhou,Feifan Wei,Haihua Wu
Electrocatalytic CO 2 reduction in solid oxide electrolysis cells (SOECs) can simultaneously convert CO 2 to valuable chemicals or fuels by integrating with renewable energy so as to alleviate the greenhouse effects and energy crisis. Cerium oxide (CeO 2 ) with high redox stability and catalytic activity toward CO 2 reduction is considered a promising SOEC cathode. However, CeO 2 is rarely directly employed as cathodes due to its unsatisfactory electrical properties. Suitable modification of CeO 2 becomes essential to improve its electrocatalytic activity . Herein, Fe-decorated on Sm-doped CeO 2 via a simple mechanical milling process was employed as cathodes for high-temperature CO 2 electrolysis in SOEC. The addition of Fe species on Sm-doped CeO 2 can greatly enhance the CO 2 electrolysis efficiency, mainly attributing to the increased catalytic active sites, electronic pairs, and oxygen vacancy concentrations, which facilitated the CO 2 adsorption and dissociation as well as the electron-ion transportation. The 1.0 wt.% Fe-decoreated on Sm-doped CeO 2 showed the highest current density of 0.57 A cm −2 at 1.9 V under 800 °C. Moreover, the co-existence of doped and surface coated Fe species on Sm-doped CeO 2 with moderate oxygen vacancies and adequate electronic transportation paths facilitate the high-temperature CO 2 electrolysis.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 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）