RSC Advances
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2016
·Vol. 6
·期 95
·92739-92747
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IF 3.289
Li Zhang,Wei Wan,Qiang Wang,Wen-Chao Lu,Bei-Hua Hou,Ping Chen
Catalysts for the oxygen reduction reaction (ORR) are crucial in metal–air batteries, fuel cells and other electrochemical devices. Developing heteroatom-doped carbon catalysts with high performance and stability in alkaline media for practical application of metal–air batteries or in acidic media for practical application of proton exchange membrane fuel cells is still difficult and challenging. Here, we report the N-, Fe-doped carbon sphere/oriented carbon nanofiber nanocomposite (NFe-CS/CNF). N-, Fe-doped carbon spheres (NFe-CS) were derived from p-phenylenediamine and oriented N-, Fe-doped carbon nanofibers (NFe-CNF) were derived from o-phenylenediamine. 3.89 at% of N and 0.38 at% of Fe were doped in a typical product, which has high surface area. The typical product exhibits a high ORR activity and stability in acidic media and reveals superior stability and tolerance to methanol than Pt/C. In alkaline media, the typical product shows superior activity to Pt/C. The performance of a zinc–air full cell under real battery operation conditions indicates that the typical product is a competitive alternative to commercial PtC. The unique structure of NFe-CS/CNF could create strong interactions between the nanospheres and oriented nanofibers, promote charger transfer at the interface and improve the conductivity. This work provides a new fundamental understanding and design strategy for excellent carbon-based ORR catalysts.
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RSC Advances
·
2016
·Vol. 6
·期 74
·70271-70276
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IF 3.289
Ying Huang,Zhaohui Wang,Changling Fang,Wenqian Liu,Xiaoyi Lou,Jianshe Liu
Addition order of reagents in the Acid Orange 7 (AO7) degradation process was investigated by varying the concentration of Fe(II), the Fe(II)/peroxymonosulfate (PMS) molar ratio and stepwise addition of Fe(II) and PMS. The importance of addition order of reagents was confirmed and an order of Fe(II)–PMS to improve the oxidation efficiency was recommended.
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FUEL
·
2024
·
IF 6.7
Jinrui Zhang,Tianlong Yang,Qiong Rao,Zhongrui Gai,Peng Li,Yuanhui Shen,Mingkai Liu,Ying Pan,Hongguang Jin
Chemical looping dry reforming of methane (CL-DRM) is a promising technology for production of syngas and the utilization of greenhouse gases, which highly relies on efficient oxygen carrier (OC) to facilitate the energy and material transfer. In this work, Fe 2 O 3 /CeO 2 oxygen carriers in physical and crystalline contact modes were synthesized and used for CL-DRM. The Fe 2 O 3 /CeO 2 crystal interface significantly promoted the oxygen release of both Fe 2 O 3 and CeO 2 . The completely reduced iron elements dispersed uniformly into the CeO 2 support and formed pure CeFeO 3 in the oxidation step. CeFeO 3 showed enhanced methane conversion rate (81.3 %), CO selectivity (96.6 %) and lower temperature sensitivity. The time-resolved reaction performance of Fe-Ce oxygen carriers was investigated to understand the relationship between the oxygen vacancy concentration and reactivity of Fe-Ce oxygen carrier. With the increasing concentration of oxygen vacancies, the oxygen carrier exhibited elevated activity and enhanced selectivity. The redox range of CL-DRM was then tuned to enhance the reaction conversion and product purity. In the deep reduction range of oxygen carrier, the deposited carbon also served as the active redox intermediate for chemical looping and enhanced both the reaction conversion rate and the product purity to nearly 100 %. These findings showcased rational methods for design and utilization of iron-based oxygen carriers and expanded the potential for chemical looping applications.
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Catalysts
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2024
·Vol. 14
·期 8
·528
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IF 3.8
Dongsheng Xiang,Zhihao Wang,Jingwen Xu,Hongdan Shen,Xiaodong Zhang,Ning Liu
Photocatalysts, such as TiO2, are widely used in photoreduction. However, drawbacks like their wide band gap and short carrier lifetime lead to lower efficiencies with their use. Introducing defects and forming heterostructures of TiO2could extend the carrier’s light-harvesting range from UV to visible light and enhance its lifetime. Herein, an electron-beam irradiation-defected TiO2was induced in MIL-88B(Fe). The structure of the material was characterized using XRD, FT-IR, TEM, HRTEM, and XPS techniques. Remarkably, TiO2under 300 kGy electron-beam irradiation performed the best with a series of 0, 100, 300, and 500 kGy irradiation ratios. PL and UV–vis DRS were utilized to measure the material’s optical properties. The introduction of MIL-88B(Fe) expanded the light response range, reduced the optical band gap, and lengthened the carrier lifetime of the defective TiO2composite photocatalysts, resulting in superior TC photoreduction capabilities of 88B5%300, which degraded 97% of tetracycline (10 mg/L) in water after 120 min.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Hanmin Zhong,Xiaoying Ye,Xueting Xie,Xianliang Song,Shucan Luo,Wenbei Situ
With the large surface area and excellent adsorption properties of MIL-101(Fe), MIL-101(Fe)/TiO 2 photocatalysts were prepared by chemical method and physical method in this research, respectively. The photocatalysts' performance on ethylene degradation was evaluated, and the photocatalyst prepared using the chemical method (CH-MT) performed better than that by physical method (PHY-MT) under the same conditions. Moreover, the photocatalysts' molecular structure was characterized by XRD, FTIR, UV–Vis DRS, BET, and XPS. The redox process of Ti 4+ /Ti 3+ of TiO 2 and Fe 3+ /Fe 2+ effectively prevents the complexation of e − -h + pairs. In this cycle, the oxidatively active substance (∙O 2 - ) is provided, which plays a key role in the ethylene degradation of MIL-101(Fe)/TiO 2 photocatalysts. Furthermore, in the BET analysis, CH-MT's specific surface area and pore volume were smaller than PHY-MT's, which improved ethylene absorption, enhanced the transfer of photogenerated carriers, and raised the photocatalytic reaction efficiency of CH-MT. The differences between MIL-101(Fe)/TiO 2 photocatalysts prepared by various methods were investigated and discussed, providing a new approach for MOF materials' application in agricultural areas.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Chuanyu Zhu,Lulu Zhang,Luyao Cui,Ziqiang Zhang,Rui Li,Yunfang Wang,Yawen Wang,Caimei Fan,Zhuobin Yu,Jianxin Liu
In the process of photocatalytic ammonia synthesis , efficient activation of nitrogen molecules constitutes a fundamental challenge. During the N 2 activation, the close interdependence between the acceptance and donation of electron results in their mutual limitation, leading to high energy barrier for N 2 activation and unsatisfactory photocatalytic performance. This work decoupled the electron acceptance and donation processes by constructing Fe-Bi dual active sites, resulting in enhancing N 2 activation through the high electron trapping ability of Fe 3+ and strong electron donating ability of Bi 2+ . The photocatalytic nitrogen reduction efficiency of 3%Fe/Bi 2 O 2.33 (118.71 μmol g cat −1 h −1 ) is 5.3 times that of Bi 2 O 2.33 (22.41 μmol g cat −1 h −1 ). In-situ Fourier transform infrared (In situ FTIR) spectroscopy and density functional theory (DFT) calculations manifest that Fe 3+ -Bi 2+ dual active sites work together to promote nitrogen adsorption and activation, and the reaction path is more inclined toward alternate hydrogenation path. N 2 adsorption and activation properties are optimized by heteronuclear bimetallic active sites, which offers a new way for the rational design of nitrogen-fixing photocatalysts .
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
·
IF 4.2
Qi Ding,Hairong Li,Weining Liu,Dandan Huang,Xi Tan,Mingyang Zhao,Qionglin Cheng,Ming Yi,Yaqian Ren
Triethylamine (TEA) is easily volatilized and poses a huge health hazard. Therefore, the rapid detection of TEA is of great significance in environmental protection and industrial applications. In this paper, coral flower-like Fe-doped Co 3 O 4 was prepared using Co-MOF-74 as precursor. Compared with the pure Co 3 O 4 , Co 3 O 4 doped with 2 mol% Fe has better gas sensing performance of TEA. At an optimum operating temperature of 199 °C, the response to 100 ppm TEA is 21.2, five times higher than that of the pure Co 3 O 4 , with a short response recovery time (13 s/15 s). In addition, the gas sensor exhibits a certain selectivity and anti-humidity stability, with a minimum detection limit of 1 ppm at operating temperature. The higher Co 2+ /Co 3+ content in the sensor promotes the reaction of TEA with ionized oxygen, and amplifies the resistance change by adjusting the carrier concentration. Meanwhile, the introduction of Fe enriches the content of vacant oxygen and provides sufficient sites for the reaction and diffusion of TEA, further enhancing the sensing performance. In addition, Co 3 O 4 and Fe 2 O 3 combine to form p-n heterojunction , which helps to accelerate the gas adsorption-desorption process and improve the sensitive response speed. It creates a new design idea for the rapid detection of TEA gas by P-type metal-oxide semiconductors at relatively low operating temperatures.
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Frontiers in Environmental Science
·
2024
·
IF 3.3
Lianjie Fan,Qinglin Xie,Yanhong Li,Shengzhang Zou,Haiping Lu,Su Ling Li,Xiaoxiao Li
Poultry manure is one of the important sources of antibiotic pollution in agricultural soil and groundwater. Recently, the excessive discharge of goat manure has resulted in groundwater environmental challenges and negative impacts. It is of practical significance that such wastes can be converted into functional materials to promote the resource utilization of waste and reduce the risk of antibiotic contamination. In this study, Fe (Ⅱ)-loaded goat manure biochar (Fe-GMC) was prepared by pyrolyzing goat manure and iron salts and used to activate peroxymonosulfate (PMS) for tetracycline (TC) degradation in groundwater. The as-prepared Fe-GMC exhibited good catalytic performance for PMS activation due to its porous surface and rich oxygen-containing groups. Under the conditions of catalyst dosage of 0.2 g/L, PMS dosage of 1.0 mM, and pH of 3.0, TC was removed 81.3% within 60 min. In addition, the TC degradation efficiency was inhibited to different extents by inorganic anions (HCO3−>Cl−>NO3−) in water. Furthermore, the quenching experiments, electron paramagnetic resonance (EPR) experiments, and X-ray photoelectron spectroscopy (XPS) spectra analysis indicated that the generation of hydroxyl radicals (•OH) was responsible for TC degradation. Particularly, Fe-GMC produces a strong oxidizing agent. This study provides an efficient and environmentally friendly tetracycline degradation catalyst, which offers a new theoretical basis for water environmental remediation.
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JOURNAL OF ELECTROCERAMICS
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2025
·
IF 2.6
Lin Cheng,He Yuchan,Zhuang Wuyi,Chen Sili,You Zhixian,Zhao Guiying,Huang Zhigao,Li Jiaxin
The development of high-performance silicon/silicon oxide (Si/SiO x ) anodes has attracted great attention in the field of next-generation high-energy lithium-ion batteries (LIBs). However, preparing effective Si/SiO x composite materials to address issues such as poor cycling stability, subpar initial coulombic efficiency (ICE), and subpar interface compatibility remains a challenge. This work proposes a simple strategy for preparing Fe/Fe 3 C particle modified thin-layer carbon-coated Si/SiO x composite materials using a mixture of resorcinol formaldehyde (RF) precursor pyrolysis and ultrasonic treatment (referred to as C@Si/SiO x -Fe/Fe 3 C, abbreviated as CSSO-Fe/Fe 3 C). These composite materials are used as anodes for LIBs. Exploiting the benefits of its structure and composition, the CSSO-Fe/Fe 3 C anode offers a high ICE value of 68.7% and maintains a capacity of 563.2 mAh g −1 even after 1200 cycles at a current density of 2.5 A g −1 . Comprehensive characterization and electrochemical studies have elucidated the interface compatibility and structural stability mechanisms induced by the small amount of Fe/Fe 3 C doping and carbon coating, which explain the high capacity and stable cycling performance. Furthermore, when paired with LiCoO 2 cathode, the assembled LiCoO 2 ||CSSO-Fe/Fe 3 C coin-type full battery has a capacity of 80.7 mAh g −1 and a capacity retention rate of 76.6% after 200 cycles at 1.0 C. This synthesis approach offers valuable insights for designing high-performance Si/SiO x electrode materials.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-14
·
IF 14.7
Zhang Peng,Chen Hsiao-Chien,Zhu Houyu,Chen Kuo,Li Tuya,Zhao Yilin,Li Jiaye,Hu Ruanbo,Huang Siying,Zhu Wei,Liu Yunqi,Pan Yuan
Metal-nitrogen-carbon catalysts with hierarchically dispersed porosity are deemed as efficient geometry for oxygen reduction reaction (ORR). However, catalytic performance determined by individual and interacting sites originating from structural heterogeneity is particularly elusive and yet remains to be understood. Here, an efficient hierarchically porous Fe single atom catalyst (Fe SAs-HP) is prepared with Fe atoms densely resided at micropores and mesopores. Fe SAs-HP exhibits robust ORR performance with half-wave potential of 0.94 V and turnover frequency of 5.99 e −1 s −1 site −1 at 0.80 V. Theoretical simulations unravel a structural heterogeneity induced optimization, where mesoporous Fe-N 4 acts as real active centers as a result of long-range electron regulation by adjacent microporous sites, facilitating O 2 activation and desorption of key intermediate *OH. Multilevel operando characterization results identify active Fe sites undergo a dynamic evolution from basic Fe-N 4 to active Fe-N 3 under working conditions. Our findings reveal the structural origin of enhanced intrinsic activity for hierarchically porous Fe-N 4 sites.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2025
·
IF 3.5
Jing Wei,Zhigang Zheng,Zhaoguo Qiu,Dechang Zeng
The removal efficiency of tetracycline (TC) by Fe-based amorphous (Fe am ) alloy was investigated through batch experiments, examining the effects of TC concentration, initial pH, and environmental temperature on its removal performance. The experimental results indicate that Fe am , owing to its amorphous structure and excellent catalytic properties, has a TC removal rate that is 2.75 times greater than that of zero-valent iron (ZVI) powder. Within the range of initial pH values from 4 to 7, the degradation efficiency for TC remains high, with nearly all removal rates reaching 99 % after 30 min of treatment. The results suggest that the removal process is primarily attributed to adsorption (by Fe 0 and its corrosion products) and reduction. The pH significantly influences the formation of iron corrosion products and the variations in TC species. The reactive adsorbed Fe 2+ plays a crucial role in the removal process. In addition to demonstrating effective removal capabilities for TC, Fe am also exhibits excellent removal performance for oxytetracycline (OTC) hydrochloride and chlorotetracycline (CTC) hydrochloride, underscoring its broad applicability among tetracycline antibiotics. In summary, this study provides a novel approach for the removal of tetracycline antibiotics from water.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Shaowei Jin,Jianfeng Gao,Guang Li,Hui Zhang,Zhaoshun Zhang,Qun Yang,Changcheng Lin,Xueqin Zuo,Shiwei Shi
Solar-driven interfacial evaporation technology has great potential in solving the global challenge of freshwater shortage. However, the selection of excellent photothermal conversion materials is a challenging task. To achieve efficient solar interface evaporation materials, we developed a new material loaded with Fe/Fe3C nanoparticles on mesoporous carbon hollow spheres(MCHS). As an interfacial evaporation material, Fe/Fe3C@MCHS-x has an evaporation rate of 1.633 kg m-2 h-1 and an energy conversion efficiency of 94.17 %(Fe/Fe3C@MCHS-2). The innovative introduction of magnetic particles into the evaporation unit allows the metal nanoparticles to absorb light at their resonance wavelength. This absorption leads to the excitation of electrons from the occupied state to the unoccupied state, and the diffusion of thermoelectron leads to the increase of carriers, which makes the interface temperature rise rapidly. The composite material has a certain degree of organic pollution treatment capability along with high-efficiency water evaporation, which provides new ideas for interfacial evaporation material technology.
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