INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jin Song,Fenglong Wu,Yulun Lu,Xinyan Zhang
Doping as a common mean to generate defects to boost the catalytic performance of metal oxide semiconductor-based materials has aroused great interest. However, doping usually requires high temperatures and is time consuming. Herein, we report a facile strategy for the preparation of F doped CeO 2 (F–CeO 2 ) with assistance of the electrostatic attraction between F − and CeO 2 with oxygen vacancies at room temperature , then F–CeO 2 acts as superior support of metal Co nanoparticles (NPs) for efficient hydrolysis of NH 3 BH 3 under light irradiation . The activity of Co/F–CeO 2 is significantly enhanced and Co/F–CeO 2 -0.6 exhibited highest catalytic activity with TOF value 92.8 min −1 which increases 47% compared with Co/CeO 2 . Experimental and characterization results show the enhanced performance attributes to high efficiency photogenerated carrier separation and boosting adsorption capacity of H 2 O and NH 3 BH 3 over Co/F–CeO 2 due to F doped into CeO 2 crystallites . Furthermore, theory calculations further confirm that the band gap of F–CeO 2 becomes smaller and F–CeO 2 is more favorable the adsorption for H 2 O and NH 3 BH 3 than pure CeO 2 . This work offers a facile and time efficiency strategy to realize controllable element doped in metal oxide under ambient, and gives deep insights into the structure–activity relationship of catalyst between defect engineering and photocatalytic performance.
研究领域:
材料科学
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化学工程
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能源科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhidong Jin,Jinbo Zhao,Chuanzhi Chen,Huan Zhou,Nan Xiang,Fei Liu,Lin Liu,Jiurong Liu,Yue Mou,Lili Wu
Constructing heterojunctions in semiconductor-based sensors is a vital method of modulating electronic structures and designing high-performance sensors for toxic gas detection. In this study, F-doped SnS x (F-SnS x ) decorated ZnOHF composites were acquired via a two-step solvothermal method . The experimental results confirmed the establishment of heterojunctions between ZnOHF and F-SnS x . The optimized F-SnS x decorated ZnOHF snowflake-like nanoflowers-based NO 2 sensors exhibited incomparable selectivity along with supreme sensitivity (S = 137–10 ppm NO 2 at 200 ℃), rapid responding/recovering speed (34 s/6 s) and low detection limit (50 ppb). NO 2 sensing mechanism and the influence of humidity interference on NO 2 sensing performances were fully discussed. This work not only evidences the great potential of F-SnS x /ZnOHF snowflake-like nanoflowers for NO 2 recognitions but also paves a feasible routine for advancing NO 2 sensing performances by electronic structure regulations.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Weirui Chen,Weijie Chen,Yimin Luo,Yanqi Feng,Xukai Li,Jing Wang,Ping Li,Liying Bin,Bing Tang,Laisheng Li
g-C 3 N 4 (CN) based catalysts were effective for photocatalytic ozonation (PCO), but their stability during reaction remained a mystery. This study investigated the change on PCO activity and stability of CN induced by F or I doping. Compared with CN, F-CN had the greater VB potential while I-CN had a greater CB position, which both led to their better O 3 activation. F-CN and I-CN PCO showed the greater oxalic acid (OA) degradation than that of CN PCO process. Though the enhanced activity, both F-CN and I-CN demonstrated the lower stability compared with that of CN. Because of the existing of reactive oxygen species (ROS) like •OH, •O 2 - and h vb + , CN, F-CN and I-CN were partially oxidized, generating NO 3 - and organic molecules such as cyanuric acid. h vb + and •OH mainly accounted for the decomposition of three CN. Triazine ring oxidation resulted in internal tearing and edge fracture as well as the formation of O-containing groups on all CN-based catalysts. O contents in catalysts initially increased and then decreased with reaction time, indicating that surface O-containing groups were unstable. The structural destroy could be eased with the present of organic pollutants. This study deepened the understanding of fate of CN based catalysts during PCO application.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 3
·e202402822
·
IF 2
Linbo Chen,Yingying Zhu,Di Wang,Jinyuan Zhu,Yumeng Ren,Geng Chen
Graphical A novel Co─FCN heterojunction photocatalyst was synthesized by introducing Co 3 O 4 and fluorine into graphitic carbon nitride (CN) using a simple one-pot pyrolysis method. The photocatalytic activity was assessed through the photodegradation of Rhodamine B (RhB). The resulting Co─FCN photocatalyst demonstrated superior photocatalytic performance and stability compared to pure CN. Photocatalysis is an effective solution to degrade organic dye discharge in wastewater treatment due to its efficiency, environmental friendliness and cost-effectiveness. However, issues such as limited visible light absorption and rapid charge carrier recombination hinder its practical use. In this research, the heterojunction (Co─FCN) composed of carbon fluoride nitride and cobalt tetroxide (Co 3 O 4 ) was successfully prepared by a simple one-pot pyrolysis method. The obtained nanocomposites showed their efficiency as photocatalyst in the photodecomposition of Rhodamine B (RhB). The relationship between microstructure and properties of photocatalyst was studied in detail by means of characterization techniques. The results showed that the RhB degradation efficiency of Co 3 ─FCN was 92.91% within 60 min irradiation time. The results of free radical scavenging experiments show that superoxide anion (·O 2− ) and hydroxyl radical (·OH) are the main active species in Co─FCN composite catalysts. In addition, the potential degradation pathway of RhB was inferred based on the intermediates detected by liquid chromatography mass spectrometry (LC-MS), and the preliminary photocatalytic reaction mechanism of Co─FCN heterogeneous catalyst was constructed accordingly. Therefore, this research provides new insights into the preparation and modification of CN photocatalysts, thereby promoting the application potential of efficient photocatalysts in the degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chengliang Lin,Jiaxuan Yin,Shengrui Cui,Xiang Huang,Wei Liu,Yongcheng Jin
High-voltage spinel LiNi0.5Mn1.5O4 (LNMO), which has the advantages of high energy density, low cost, environmental friendliness, and being cobalt-free, is considered one of the most promising cathode materials for the next generation of power lithium-ion batteries. However, the side reaction at the interface between the LNMO cathode material and electrolyte usually causes a low specific capacity, poor rate, and poor cycling performance. In this work, we propose a facilitated method to build a well-tuned dual structure of LiF coating and F– doping LNMO cathode material via simple calcination of LNMO with LiF at low temperatures. The experimental results and DFT analysis demonstrated that the powerful interface protection due to the LiF coating and the higher lithium diffusion coefficient caused by F– doping effectively improved the electrochemical performance of LNMO. The optimized LNMO-1.3LiF cathode material presents a high discharge capacity of 140.3 mA h g–1 at 1 C and 118.7 mA h g–1 at 10 C. Furthermore, the capacity is retained at 75.4% after the 1000th cycle at 1 C. Our research provides a concrete guidance on how to effectively boost the electrochemical performance of LNMO cathode materials.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 56
·35215-35227
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IF 3.361
Yue Jian,Huayang Liu,Jiaming Zhu,Yaqiong Zeng,Zuohua Liu,Chentao Hou,Shihua Pu
Photocatalytic degradation is an eco-friendly and sustainable method for the treatment of water pollutants especially tetracycline hydrochloride (TCH). Herein, we developed F-doped H2Ti3O7-{104} nanorods with oxygen vacancies using TiOF2 as a precursor by simple alkali hydrothermal and ion-exchange methods. The phase structure, surface composition, optical properties, specific surface areas and charge separation were analysed by a series of measurements. The effects of KOH concentration on the structure and properties of H2Ti3O7 were investigated. It is confirmed that the TiOF2/H2Ti3O7 composite can be formed in low concentration KOH solution (1 mol L−1), while the H2Ti3O7 single phase can be formed in high concentration KOH solution (>3 mol L−1). The prepared F-doped H2Ti3O7-{104} nanorods provide a high specific surface area of 457 m2 g−1 and a macroporous volume of 0.69 cm3 g−1. The appropriate mesoporous structure of the photocatalyst makes TCH have a stronger affinity on its surface, which is more conducive to the subsequent photodegradation. Moreover, a synergistic mechanism of photosensitization and ligand–metal charge transfer (LMCT) in the photocatalytic degradation of TCH was proposed. In addition, the prepared F-doped H2Ti3O7-{104} nanorods showed excellent cycle stability and resistance to light corrosion. After five cycles of photodegradation, the degradation rate of TCH was only reduced from 92% to 83%. This low-cost strategy could be used for the mass production of efficient photocatalysts, which can be used for TCH clean-up in wastewater treatment.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
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IF 6.6
Tianfang Yang,Ye Chen,Miao Tian,Xupo Liu,Fengxian Zhang,Jing Zhang,Kun Wang,Shuyan Gao
ABSTRACT Heteroatom doping is considered as an effective approach that manipulates the local bonding environment to improve the electroactivity of Fe-N/C catalysts. Herein, the oxidation polymerization-pyrolysis approach is applied to fabricate the uniformly F-doped porous Fe-N/C catalysts (F-FeNC) through utilizing 4-fluoroaniline as a “self-doping” precursor with N and F elements simultaneously. The synergistic effect between ligand trapping and long-range interaction of F atoms provides high density of Fe-N x active sites. The F-FeNC catalyst demonstrates superior ORR performance in alkaline media with a positive half-wave potential ( E 1/2 ) of 0.82 V, low H 2 O 2 yield of ∼3.4% and rapid 4e − transfer process. The liquid-state Zn-air battery (ZAB) assembled with F-FeNC catalyst as air cathode delivers excellent rate capability, power density (141 mW cm −2 ), specific capacity (760 mAh g − 1 ) and long-term cycle durability over 120 h. Moreover, the as-assembled all-solid-state ZAB shows excellent cycle stability at 0°∼180° bending conditions, revealing great prospects in flexible electronic device applications. Engineering the electronic structure of active sites via F self-doping provides an insightful route for designing multi-heteroatom doped Fe-N/C catalysts.
研究领域:
材料科学
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电化学
·
能源存储与转换
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Zuhao Zhang,Xiaoyan Xie,Huixian Xie,Xiaokai Ding,Jiaxiang Cui,Chenyu Liu,Dong Luo,Zhan Lin
Cobalt-free Li-rich layered oxides (LLOs) such as Li 1.2 Mn 0.6 Ni 0.2 O 2 have attracted extensive attention owing to their high specific capacity and low cost. Nonetheless, numerous problems such as continuous voltage fading and capacity decay have become stumbling blocks in its commercial application. In this study, we propose an effective dual-site doping strategy by choosing Mo as the cation and F as the anion to enhance the capacity and cycling performance. The research demonstrates that the cycling stability of LLOs enhances with the doping ratio of Mo, and their capacity increases with the doping ratio of F. It is because Mo as a pillar enhances the structural stability and F doping is conducive to the activation of Li 2 MnO 3 . What's more, dual-site doping also promotes the diffusion of Li + and reduces the internal resistance of the electrode. Due to these improvements, the 5F3M sample still maintains a discharge capacity of 190.98 mAh g -1 after 100 cycles at 200 mA g -1 , which is much higher than 165.29 mAh g -1 of the Pristine sample. This discovery provides a new way to develop advanced layered oxide cathodes for both Na- and Li-ion batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Huili Zhang,Hailin Yu,Wen Yuan,Bo Yu,Ying Chen,Jinjun Deng,Danfeng He,Ye Zhang
Co2+ and F– are doped into lattice of TiO2 powders, and the effects on charge trapping, recombination, and interface transfer are systematically researched. Double doped TiO2 photocatalyst was introduced on Graphene oxide, to construct heterojunction for photocatalytic denitrification of fuel containing pyridine (PY), indole (IND), and quinoline (QUI). A significant improvement in the photocatalytic activity was detected with the double doped modified heterojunction photocatalyst as compared to the pure TiO2. The reason for the improvement of the photocatalytic denitrification performance of oil may be derived from that the doped metal ions and nonmetal ions capture charge carriers to provide an alternative pathway for interface charge transfer, decreased the band gap width and the energy required for the transition, and caused the red shift in the light response range. On the other hand, catalyst supported on RGO, not only accelerated the transfer of photogenic carriers, improved the life of catalytic active component, but also enhanced the dispersibility of catalyst in oil. The experimental results showed that the activity and reusability of the photocatalyst denitrification performance was found satisfactory. On this basis, it is indicated that Co2+/F–/TiO2-RGO can be prospective materials for catalytic denitrification of oil.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xing Zhang,Suhang Chen,Haidong Luo,Zhenhua Tang,Enzhou Liu,Zhao Qin,Kangzhen Xu
The rapid redox cycle of metal active sites and effective surface reactions are crucial factors to activate peroxymonosulfate (PMS) for environmental remediation. Herein, a novel F-g-C 3 N 4 /Mn x Co 3−x O 4 composite as high-efficient PMS activator was successfully constructed by a one-step hydrothermal method for the degradation of 1,1-diamino-2,2-dinitroethylene (FOX-7). It was discovered that F doping could narrow the band gap, and enhance the light absorption range and the separation of photogenerated electron-hole pairs. Among all samples, the catalytic activity of F-CN/MCO was higher than that of MCO and CN/MCO. This can be attributed to the unique materials morphology and the synergistic effect of photocatalytic and chemical catalytic driven PMS activation. Quenching experiments and electron paramagnetic resonance (EPR) proved that both radical and non-radical pathways are responsible for the degradation of FOX-7, and singlet oxygen ( 1 O 2 ) was identified as the predominant active species. Importantly, the synergy between Co 2+ /Co 3+ and Mn 2+ /Mn 3+ couples enhanced more electron transfer and better redox potential, thus greatly promoting the photocatalytic activation of PMS. This work provides a novel approach for designing efficient catalyst to promote the redox behavior of metal species in sulfate radical-based advanced oxidation processes.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 44
·期 3
·1577-1593
·
IF 9.6
Sun Gao-Xing,Zhu Bin,He Rui,Liang Qi-Dong,Jiang Sheng-Yu,Ren Yan,Pan Xiao-Xiao,Sun Yu-Qing,Lu Mi,Zhang Wen-Xian,Huang Cheng-Huan,Zhuang Shu-Xin
Although lithium-ion batteries are widely recognized as a new generation of energy storage devices, their large-scale application is severely hampered by their low energy density and restricted cyclic stability. Herein, an ingenious dual-modified interface, where the F-doping and fluorocarbon coating co-existed on Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 surface, is rationally constructed to elevate its energy density and structural stability attributed to F − grafting between the bulk material and the coating utilizing a robust super-conformal fluorocarbon coating structural framework and more stable F-doped system under high charge/discharge cut-off voltage. In comparison with a single carbon-coated modified Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 , the dual-modified sample overcomes the fatal disadvantage of carbon coating stripping during long-period cycles ascribed to the “TM-F-multifunctional coating” connector which firmly combines the bulk material with the coating with a strong interaction force, exhibiting a more stable-reversible structure and excellent comprehensive electrochemical performance under high cut-off voltage. Concomitantly, the F-transition metal bonds with stronger bond energies improve its structural reversibility during the processes of charge/discharge under high voltage. Furthermore, the fluorocarbon coating enhances its charge transfer ability and effectively restrains the interfacial side reactions. Additionally, the climbing nudged elastic band methodology is used to calculate the diffusion energy barrier of lithium-ions in the matrix material, which confirms the fundamental reason for its superior lithium-ion diffusion ability. The high pseudocapacitance contribution ratio is perfectly explained by calculating the adsorption capacity on the surface of the dual-modified sample. Consequently, experiments and theoretical calculations unequivocally confirm its distinguished electrochemical properties under high cut-off voltage. Graphical
研究领域:
材料科学
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电化学
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能源存储
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锂离子电池
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表面工程
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固态化学
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纳米材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Ying Sha,Jianshu Wang,Chaoxuan Wang,Zeqi Liu,Hao Wang,Lei Qian
VO2 has emerged as a promising cathode material for aqueous zinc-ion batteries, attributed to its unique one-dimensional tunnel structure and reversible Zn2+ de/intercalation. However, its practical application is hindered by intrinsically poor conductivity, slow ion diffusion and structural instability during long-term cycling. In this study, we introduce a novel dual-ion synergy strategy by co-doping NH4+ and F− to systematically address these challenges. The combined effects of NH4+-induced lattice expansion and F−-mediated electronic modulation significantly enhance the electrochemical performance of VO2·xH2O (VONF-0.4). Specifically, NH4+ increases the tunnel spacing for facile Zn2+ diffusion and stabilizes the V–O framework via the “pillar” effect and hydrogen bonding, while the partial substitution of O2− with F− enhances conductivity and suppresses vanadium dissolution by forming a hydrophobic interface. The optimized VONF-0.4 cathode delivers satisfactory rate capability and a high initial specific capacity of 415.4 mAh g−1 at 1.0 A g−1, which can be maintained at 371.1 mAh g−1 after 300 cycles. Notably, it shows outstanding long-term stability and retains 99.4% of its initial capacity after 1400 cycles at 10 A g−1. This work demonstrates the feasibility of dual-ion engineering in designing advanced cathode materials for high-performance aqueous zinc-ion batteries.
研究领域:
材料科学
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电化学
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储能
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电池技术
✓ 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）