MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Guoxin Ding,Chenfeng Sun,Meiyi Wang,Yuexiang Hu,Guojun Cheng,Jun Liu
The 2D nanomaterial has been widely used in the field of electromagnetic wave absorption because of its high specific surface area and special electrical properties. In this work, three 2D materials were integrated to form a unique ternary composite with Ti 3 C 2 T x MXene as the substrate, RGO as the intercalator with additional components, and CoFe-LDH loaded on the MXene/RGO surface. The interfacial and dipole polarizations were notably enhanced due to the abundant formation of heterogeneous interfaces between the three 2D materials and their corresponding abundant functional groups and defects, and the space between the 2D lamellae enabled multiple reflections of electromagnetic waves. Compared with pure MXene, the MXene/RGO/CoFe-LDH composites exhibited excellent electromagnetic wave absorption performance due to the synergy of multiple loss mechanisms, resulting in the best reflection loss value of −58.9 dB at 13.12 GHz.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Yiliang Liu,Ying Lin,Zhixin Cai,Yongzhen Ma,Hongwei Zhou,Wei Chai,Qibin Yuan,Haibo Yang
With the rapid development of modern electronic technology, electromagnetic wave (EMW) absorption materials play a crucial role in solving the problem of electromagnetic radiation pollution. By designing unique microstructures or composite magnetic components, the EMW attenuation ability of carbon nanofibers (CNFs) can be enhanced. However, the ultra-high conductivity of CNFs leads to impedance mismatch, necessitating the introduction of components that can rapidly optimize dielectric properties for improved impedance matching. In this study, Co0.7Fe0.3@CNFs@MnO2 (CFCM) was fabricated by coating MnO2 nanosheets on necklace-like CoFe@carbon nanofiber composites. The coated MnO2 nanosheets not only enhance the EMW attenuation ability, but also improve impedance matching. The results indicate that the minimum reflection loss of the sample is −62.7 dB, and the effective absorption bandwidth reaches 6.5 GHz. This work presents a valuable method to prepare outstanding EMW absorption materials with a necklace-like 3D network hierarchical structure.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Jingyang Li,Haiyu Cao,Hongying Qi,Yuexiang Li,Sha Zhu,Xue Ye,Jintao Zhang,Zifeng Yu,Jiao Zhu,Xin Zhao
A series of CoFe-LDHs@MoS 2 -x (x = 0.1, 0.2 and 0.5) samples were successfully synthesized to activate peroxymonosulfate (PMS) for tetracycline (TC) removal. With the introduction of MoS 2 could promote the catalytic performance via accelerating the Fe 2+ /Fe 3+ and Co 2+ /Co 3+ cycle. About 98.8 % of TC could be removed over 12 min under a neutral condition in the CoFe-LDHs@MoS 2 -0.2/PMS system, which was 4.4 times higher than that of CoFe-LDHs/PMS system. The main reactive oxygen species (ROS) in CoFe-LDHs@MoS 2 -0.2/PMS system were also explored by using quenching and free radical capture experiments. The singlet oxygen ( 1 O 2 ) played a major role for the TC removal. Besides, the decomposition pathways of TC were deduced by UPLC-QTOF/MS, and the stability of catalysts had also been studied. This work provided theoretical and experimental basis for designing and preparation more effective heterogeneous catalysts for PMS activation .
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Canadian Journal of Chemistry
·
2022
·Vol. 100
·期 11
·
IF 1.051
Xia Gao,Peng Deng,Kehua Han,Yu Cao
In this work, CoFe-based oxide nanosheets were prepared by a facile method and its catalysis effects on the thermal decomposition of ammonium perchlorate (AP) were studied. CoFe-based oxide nanosheets were obtained from hydrothermal process and high-temperature treatment of CoFe-layered double hydroxide. The samples were characterized by scanning electron microscopy and high-resolution transmission electron microscopy. The thermal catalytic decomposition of AP with CoFe-based oxide nanosheets as catalysts was investigated by differential scanning calorimetry and coupling Fourier transform infrared spectrometer. The results showed that the CoFe-based oxide samples with the width size of 200–300 nm and the thickness size of ∼10 nm show the inherent catalytic ability. With 10 wt% of CoFe-based oxide nanosheets added, the decomposition temperature of AP was reduced by 127.5 °C from 431.0 °C to 303.5 °C. The apparent activation energy was decreased by 61.1 kJ/mol from 177.3 kJ/mol of raw AP to 116.2 kJ/mol of AP with 10 wt% of CoFe-based oxide nanosheets added. The thermal catalysis decomposition mechanism of AP with CoFe-based oxide nanosheet material promoting was proposed. This work offered a novel idea toward preparation and application of functional material layered double hydroxide in the field of energetic materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Yuanting Lei,Lili Zhang,Danni Zhou,Chengli Xiong,Yafei Zhao,Wenxing Chen,Xu Xiang,Huishan Shang,Bing Zhang
Electrocatalytic overall water splitting is considered to be a promising strategy for hydrogen production . However, the development of high-efficient and robust bifunctional catalysts with earth-abundant elements for water splitting is of great significance. Herein, interconnected CoFe alloy nanosheets supported on NiO nanosheets (NiO/CoFe alloy) were synthesized on carbon cloth via a simple electrochemical activation of NiO/CoFe-layered double hydroxide (NiO/CoFe-LDH). The as-prepared NiO/CoFe alloy exhibits excellent activity and durability toward HER (hydrogen evolution reaction) and OER (oxygen evolution reaction). Impressively, it requires comparatively low overpotentials of 218 and 280 mV to deliver the current density of 10 and 30 mA cm −2 for HER and OER in 1.0 M KOH, respectively. The superior catalytic behavior may derive from the interconnected nanosheets structure, abundant exposed active sites, and the fast electron transfer of NiO/CoFe alloy. This work may shed light on the rational construction and design of precious metal-free catalysts with remarkable performance for overall water splitting and beyond.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 8
·e202200113
·
IF 3.82
Minglong Xia,Mengjie Yang,Yuchao Guo,Xi Sun,Shuo Wang,Yi Feng,Huili Ding
Graphical The CoFe−P/Ti 3 C 2 T x nanosheets have been synthesized via reflux hydrothermal and phosphorization. The obtained CoFe−P/Ti 3 C 2 T x is an excellent OER catalyst, and its performance exceeds that of the noble metal catalyst RuO 2 . Oxygen evolution reaction (OER) is a crucial step in many sustainable energy technologies. Exploring cost-effetive electrocatalysts with high efficiency is one of the most critical but challenging problems to overcome the slow reaction rate and high overpotential in OER. Layered double hydroxide (LDH) has excellent OER performance. However, their poor electrical conductivity and easy agglomeration limit their use. Currently, further phosphorizaton or incorporating with conductive substrates is an effective method to improve the OER performance. In this study, a hybrid product denoted as CoFe−P/Ti 3 C 2 T x were successfully prepared by facile reflux hydrothermal and phosphorization. The optimized CoFe−P/Ti 3 C 2 T x possesses a low overpotential of 270 mV at a current density of 10 mA cm −2 and a small Tafel slope (57.7 mV dec −1 ). In addition, an overpotential of 337 mV was needed for affording 50 mA cm −2 in the 1 M KOH.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Feng Zhang,Yu Lei,Guang Li,Yangchen Xie,Xinjia Guo,Xiaoyan Zhang,Xianyou Wang
Graphical ORR or OER : CoFe layered double hydroxide (CoFe-LDH) nanosheets are deposited on nitrogen-doped graphite-carbon polyhedra with FeCo alloy nanoparticles to form a composite bifunctional oxygen electrocatalyst. The FeCo/LDH-NGCP catalyst shows wonderful ORR and OER bifunctional electrocatalytic performance, which is superior to that of the precious metal based catalyst. Reasonably screening the targeted oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) constituents and constructing high-efficiency and stabilized ORR/OER bifunctional electrocatalysts are pivotal for the advancement of rechargeable zinc-air batteries (ZABs). Here, CoFe layered double hydroxide (CoFe-LDH) nanosheets are deposited on nitrogen-doped graphite-carbon polyhedra with FeCo alloy nanoparticles (FeCo/LDH-NGCP). Due to the synergic effect between FeCo-NGCP, CoFe-LDH and FeCo/LDH-NGCP, the electrocatalyst with the abundant and accessible active sites can provide good charge/mass transfer, and thus shows wonderful ORR and OER bifunctional electrocatalytic performance. In ORR tests, FeCo/LDH-NGCP catalyst displays larger half-wave potential (E 1/2 , 0.89 V vs. 0.85 V), higher limiting current density (J L , 5.91 mA/cm 2 vs. 5.14 mA/cm 2 ) and better stability than commercial Pt/C. As for OER, FeCo/LDH-NGCP possesses a smaller overpotential (η) of 299.6 mV at a current density of 10 mA/cm 2 and more durable stability than commercial RuO 2 (330.6 mV). Furthermore, in ZAB tests, the cycling stability of ZAB-FeCo/LDH-NGCP (over 470 h) outperforms the ZAB-Pt/C+RuO 2 (92 h) with commercial electrocatalyst (Pt/C+RuO 2 ). Therefore, the FeCo/LDH-NGCP catalyst offers a new perspective to construct ZABs bifunctional catalysts and their commercial application in ZABs.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Yi Liu,Guangyao Qiu,Yongfeng Liu,Yuzhong Niu,Rongjun Qu,Chunnuan Ji,Ying Wang,Ying Zhang,Changmei Sun
Two kinds of metal organic framework (MOF) materials with Fe family elements as bimetallic center were synthesized via two different methods of one pot flux and MOF-on-MOF, respectively. The thermal stability and pore structure of the prepared MOF materials were different from each other. The prepared MOF materials were utilized to remove Congo red from aqueous solution to test their potential use in the treatment of wastewater containing organic dyes. Parameters affecting adsorption properties like contact time, initial concentration, ionic strength and pH of Congo red solution were systematically investigated. The adsorption capacity of CoFe-MOF material can reach as high as 1935.68 mg/g for Congo red and those of MOF materials with monometallic Fe and Co were 775.19 and 628.93 mg/g, respectively, indicating CoFe-MOF exhibited more defects leading to higher adsorption efficiency. It was surprising and interesting to find that the adsorption behaviors of the CoFe-MOF materials prepared by two different methods were different from each other. The prepared MOF materials can be used as potential candidates to treat organic dyes pollution especially anionic dyes from wastewater. This study provided guiding significance in the preparation of mixed MOF materials with more defects to be used in the remediation of effluents including organic dyes.
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
Nanomaterials
·
2023
·Vol. 13
·期 18
·2579
·
IF 5.3
Yue Chang,Minmin Han,Yehui Ding,Huiyun Wei,Dawei Zhang,Hong Luo,Xiaogang Li,Xiongbo Yan
Effectively regulating and promoting the charge separation and transfer of photoanodes is a key and challenging aspect of photoelectrochemical (PEC) water oxidation. Herein, a Ti-doped hematite photoanode with a CoFe-LDH cocatalyst loaded on the surface was prepared through a series of processes, including hydrothermal treatment, annealing and electrodeposition. The prepared CoFe-LDH/Ti:α-Fe2O3photoanode exhibited an outstanding photocurrent density of 3.06 mA/cm2at 1.23 VRHE, which is five times higher than that of α-Fe2O3alone. CoFe-LDH modification and Ti doping on hematite can boost the surface charge transfer efficiency, which is mainly attributed to the interface interaction between CoFe-LDH and Ti:α-Fe2O3. Furthermore, we investigated the role of Ti doping in enhancing the PEC performance of CoFe-LDH/Ti:α-Fe2O3. A series of characterizations and theoretical calculations revealed that, in addition to improving the electronic conductivity of the bulk material, Ti doping also further enhances the interface coupling of CoFe-LDH/α-Fe2O3and finely regulates the interfacial electronic structure. These changes promote the rapid extraction of holes from hematite and facilitate charge separation and transfer. The informative findings presented in this work provide valuable insights for the design and construction of hematite photoanodes, offering guidance for achieving excellent performance in photoelectrochemical (PEC) water oxidation.
研究领域:
材料科学
·
能源转换
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 15
·5718
·
IF 4.6
Xiya Yang,Xun He,Lang He,Jie Chen,Longcheng Zhang,Qian Liu,Zhengwei Cai,Chaoxin Yang,Shengjun Sun,Dongdong Zheng,Asmaa Farouk,Mohamed S. Hamdy,Zhaogang Ren,Xuping Sun
Seawater electrolysis has great potential to generate clean hydrogen energy, but it is a formidable challenge. In this study, we report CoFe-LDH nanosheet uniformly decorated on a CuO nanowire array on Cu foam (CuO@CoFe-LDH/CF) for seawater oxidation. Such CuO@CoFe-LDH/CF exhibits high oxygen evolution reaction electrocatalytic activity, demanding only an overpotential of 336 mV to generate a current density of 100 mA cm−2in alkaline seawater. Moreover, it can operate continuously for at least 50 h without obvious activity attenuation.Keywords:hierarchical CuO@CoFe-LDH nanoarray;alkaline seawater electrolysis;oxygen evolution reaction
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
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zihao Chen,Senjie Dong,Minghui Wang,Zunpeng Hu,Huiling Chen,Ye Han,Ding Yuan
Constructing three-dimensional (3D) hierarchical heterostructures is an appealing but challenging strategy to improve the performance of catalysts for electrical energy devices. Here, an efficient and robust flexible self-supporting catalyst, interface coupling of ultrathin CoFe-LDH nanosheets and Co3O4 nanowire arrays on the carbon cloth (CC/Co3O4@CoFe-LDH), was proposed for boosting oxygen evolution reaction (OER) in rechargeable liquid/solid Zn–air batteries (ZABs). The strong interfacial interaction between the CoFe-LDH and Co3O4 heterostructures stimulated the charge redistribution in their coupling regions, which improved the electron conductivity and optimized the adsorption free energy of OER intermediates, ultimately boosting the intrinsic OER performance. Besides, the 3D hierarchical nanoarray structure facilitated the exposure of catalytically active centers and rapid electron/mass transfer during the OER process. As such, the CC/Co3O4@CoFe-LDH catalyst achieved excellent OER catalytic activity in alkaline medium, with a small overpotential of 237 mV at 10 mA cm–2, a low Tafel slope of 35.43 mV dec–1, and long-term durability of up to 48 h, significantly outperforming the commercial RuO2 catalyst. More impressively, the liquid and flexible solid-state ZABs assembled by the CC/Co3O4@CoFe-LDH hybrid catalyst as the OER catalyst presented a stable open circuit voltage, large power density, superb cycling life, and satisfactory flexibility, indicating great potential applications in energy technology. This work provides a good guidance for the development of advanced electrocatalysts with heterostructures and an in-depth understanding of electronic modulation at the heterogeneous interface.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 42
·e56087
·
IF 2.7
Ke Shang,Huijing Jiang,Jing Zhao,Bi Zhao,Xing Jin,Guide Lin,Jinjun Yang,Junsheng Wang
In order to improve the flame retardancy and smoke suppression of silicone rubber foam (SRF), the CoFe-LDH was fabricated by coprecipitation method and used as flame-retardant ingredient in SRF. The influence of CoFe-LDH on the flame retardancy, combustion behavior, and thermal stability of SRF was investigated. The results demonstrate that SRF containing only 1.0 phr CoFe-LDH can pass V-0 rating in the vertical combustion test, with a limiting oxygen index of 28.6%. The total heat release and total smoke production are 22.2% and 61.1% lower than that of SRF, respectively. Moreover, CoFe-LDH can improve the thermal stability of SRF in the high temperature range, and the char residue at 900°C of SRF/LDH composite is obviously higher than that of pure SRF. In addition, to further understand the flame-retardant mechanism of CoFe-LDH, the micromorphology of the char residue and the gaseous products during heating for SRF and SRF/LDH composite were analyzed. The results indicate that CoFe-LDH exhibits excellent flame-retardant effects in both condensed and gaseous phases for its functions of catalysis, carbonization, and nonflammable gas release. This study provides a more efficient and convenient strategy for the flame retardant and smoke suppression research of SRF.
研究领域:
材料科学
·
燃烧学
✓ 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）