JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 3
·2212-2225
·
IF 3.553
Guo Yue,Sun Qiaozhi,Song Kai,Ding Jiawei,Shi Chunsheng,He Fang
With the aim to obtain microwave (MW) absorber possessing simultaneous light weight and broad absorption bandwidth, FeCo imbedded 3D porous carbon network microspheres (3DC@FeCo) were synthesized via spray-drying followed by calcination processes. 3DC@FeCo exhibits 3D porous carbon microspheres structure with submicrometer-sized macropores. The FeCo imbedded carbon structure not only restrains the growth and agglomeration of FeCo nanoparticles, but also effectively introduces polarization and suppresses the skin effect from FeCo. In addition, the 3D porous carbon microspheres provide more channels which enhance the multiple reflection for microwave. The microwave absorption performance of 3DC@FeCo can be adjusted through changing the carbonization temperature, and the sample after carbonized at 630 °C (3DC@FeCo-630) shows the best microwave absorption property. It is worth mentioning that there is only 21.8 wt% FeCo in 3DC@FeCo, indicating that the 3DC@FeCo microspheres proposed in this study are one kind of lightweight microwave absorbers. The minimum reflection loss (RL) value of 3DC@FeCo-630 is − 47.4 dB at 6.35 GHz and the effective absorption bandwidth (RL < − 10 dB) can reach up 5.66 GHz (12.08–17.74 GHz) with the matching thickness of only 2.7 mm. The excellent microwave absorption ability can be attributed to favorable impedance matching, strong dielectric loss, magnetic loss, FeCo imbedded carbon and unique 3D porous structure. 3DC@FeCo microspheres as broadband and lightweight microwave absorbers exhibit a promising prospect applied in complex electromagnetic environments.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Guofu Ma,Xuan Xie,Kanjun Sun,Hui Peng,Shuzhen Cui,Xiaozhong Zhou,Qintao Wang,Ziqiang Lei
Novel Fe 3 C nanoparticles that decorate three-dimensional N-rich porous carbon (Fe 3 C@3DNC) catalysts were designed and synthesized by double templates assisted high-energy ball milling and subsequent high-temperature pyrolysis for the oxygen reduction reaction (ORR). NaCl and Na 2 SiO 3 are used as the mixed template while Fe(NO 3 ) 3 ·9H 2 O and 2-Methylimidazole were used as the iron, nitrogen and carbon sources. The optimized Fe 3 C@3DNC catalyst (Fe 3 C@3DNC-1-900) had good ORR performance in alkaline medium , with an Eonest value of 0.968 V and E 1/2 value of 0.861. In addition, the catalytic process exhibited selectivity–nearly four-electron transfer kinetics and possesses a lower Tafel slope compared to commercial Pt/C catalyst as well as good methanol tolerance. In addition, the Fe 3 C@3DNC-1-900 catalyst also had excellent ORR activity (E 1/2 = 0.72 V) and long-term stability (the half-wave potential only occurs at 10 mV after 5000 cycles) in acidic media. The good catalytic performance of the Fe 3 C@3DNC-1-900 catalyst can be attributed to the 3D hierarchically porous structure and extremely high number of active sites around the porous carbon. The double template assisted high-energy ball milling strategy can be a promising and scalable method to prepare three-dimensional porous carbon-based composite materials for energy conversion and storage applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 5
·262
·
IF 4
Dezhi Kong,Qingwei Zhang,Lin Li,Huimin Zhao,Ruixin Liu,Ziyang Guo,Lei Wang
Aqueous zinc-ion batteries (ZIBs) have received much attention because of their high safety, low pollution, and satisfactory energy density (840 mAh g−1), which is important for the research of new energy storage devices. However, problems such as short cell cycle life and low coulombic efficiency (CE) of zinc (Zn) anodes due to disorderly growth of Zn dendrites and side reactions of hydrogen corrosion have delayed the practical application of ZIBs. In this work, a new “self-growth” method is proposed to build a robust and homogeneous three-dimensional (3D) nanoporous structure of tin (Sn)-coated Zn anodes (ZSN) in just 10 min by a simple and fast reaction, which can largely raise the surface area of the electrode plate. The ZSN not only provides abundant Zn nucleation sites, but also reduces the corrosion current, thus alleviating the self-corrosion of the electrolyte, reducing the occurrence of hydrogen precipitation side reactions, and effectively inhibiting the growth of Zn dendrites during cycling. Thus, a symmetric cell with a ZSN anode can be stabilized with very low voltage hysteresis (30 mV) for 480 h of stable plating/stripping cycles and can operate well for 200 h even at high current densities of 10 mA cm−2. Supercapacitors and button cells were assembled, respectively, to verify the performance of ZSN electrodes in different energy storage tools. The ZSN||AC supercapacitor exhibited superior capacity (75 mAh g−1) and high reversibility (98% coulombic efficiency) at a current density of 2 A g−1. With a MnVO (MVO) electrode as the cathode, the ZSN||MVO full cell presents excellent cycling stability with a capacity retention of 95.4% after 500 cycles at 2 A g−1, which far exceeds that of the bare Zn cell.Keywords:nanoporous anode;aqueous Zn-based battery;dendrite-free;3D metal versatile protective layer
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Cong Gui,Dengxu Wang,Jinfeng Cao,Shengyu Feng
Three-dimensional (3D) hierarchically porous materials are widely used owing to their unique pore structures and rich specific surface areas. Herein, we design a 3D macroporous and mesoporous silicone sponge via a one-pot efficient thiol oxidative coupling reaction between polysiloxanes and HS-modified mesoporous polymers. The diameters of the macropores and mesopores are higher and lower than 50 nm, respectively. The sponge possesses a surface area of 20.72 m2 g–1, a porosity of 61.39%, and good compression and thermal insulation properties. A dye adsorption evaluation confirmed that the sponge selectively removed cation dyes from a mixed dye solution. This synthesis method for 3D macroporous and mesoporous sponges can potentially synthesize composites of other mesoporous materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Xianfei Xie,Xiaoyu Deng,Sheng Wang,Jianfeng Dai
Three-dimensional porous carbon-based materials have garnered significant attention due to their outstanding structural properties and remarkable microwave absorption capabilities. However, the construction of well-defined 3D carbon material structures currently relies on complex preparation processes and stringent conditions. In this study, hollow nitrogen-doped carbon flowers (HNC) with large specific surface area and multilevel pore structure were successfully prepared by a simple carbonization and etching process. This unique structure not only greatly reduces the material density, but also introduces nitrogen atoms that can generate more dipole polarization, effectively improving impedance matching and enhancing electromagnetic wave absorption performance. Notably, the material exhibits optimal electromagnetic wave absorption at a 25 % fill rate, with a minimum reflection loss (RL min ) of −55.49 dB at a thickness of 3.248 mm and an effective absorption bandwidth of 4.4 GHz. Given its straightforward preparation process, HNC holds the potential to be one of the options for high-performance microwave absorber materials.
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
·
2022
·Vol. 15
·期 3
·925
·
IF 3.748
Weihua Chen,Jiancheng Tang,Peidong Cheng,Yunlong Ai,Yi Xu,Nan Ye
2D layered MXene (Ti3C2Tx) with high conductivity and pseudo-capacitance properties presents great application potential with regard to electrode materials for supercapacitors. However, the self-restacking and agglomeration phenomenon between Ti3C2Txlayers retards ion transfer and limits electrochemical performance improvement. In this study, a 3D porous structure of Ti3C2Txwas obtained by adding alkali to a Ti3C2Txcolloid, which was followed by flocculation. Alkaline-induced flocculation is simple and effective, can be completed within minutes, and provides 3D porous networks. As 3D porous network structures present larger surface areas and more active sites, ions transfer accelerates, which is crucial with regard to the improvement of the superior capacitance and rate performance of electrodes. The sample processed with KOH (K-a-Ti3C2Tx) exhibited a high capacity of approximately 300.2 F g−1at the current density of 1 A g−1. The capacitance of the samples treated with NaOH and LiOH is low. In addition, annealing is essential to further improve the capacitive performance of Ti3C2Tx. After annealing at 400 °C for 2 h in a vacuum tube furnace, the sample treated with KOH (K-A-Ti3C2Tx) exhibited an excellent specific capacitance of approximately 400.7 F g−1at a current density of 1 A g−1, which is considerably higher than that of pristine Ti3C2Tx(228.2 F g−1). Furthermore, after 5000 charge–discharge cycles, the capacitance retention rate reached 89%. This result can be attributed to annealing, which can further remove unfavourable surface groups, such as –F or –Cl, and then improve conductivity capacitance and rate performance. This study can provide an effective approach to the preparation of high-performance supercapacitor electrode materials.Keywords:Ti3C2Tx;alkaline treatment;annealing treatment;3D porous structure;supercapacitors
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shuqing Ma,Chunyan Ding,Zhuoyang Li,Yu Ma,Xiaozhen Ren,Songsong Wu,Shan Gao,Chuncheng Wei,Weiwei Zhou,Guangwu Wen,Xiaoxiao Huang
Three-dimensional (3D) porous carbon has sufficient specific surface area and anchor positioning points. The pore structure facilitates uniform charge distribution, and buffers volume changes during stripping. However, single carbon materials have limited theoretical capacity and short cycle life. Here, 3D porous carbon material BCN/Mn-6 (B,N and Mn co-doped porous carbon with 6 mmol Mn content) co-doped with manganese, boron and nitrogen was synthesized by heat treatment. Affective modulation of the material structure and surface functional groups was achieved by adjusting the amount of manganese doping. The metal element doping can promote the diffusion of lithium ions , and the formed vacancies and defects can be used as lithium storage sites. Nitrogen doping can improve the dispersion and stability of metals and oxides , and regulate the redox capacity. Co-doping of metals and heteroatoms synergistically improves electrical conductivity . Thus, BCN/Mn-6 exhibits excellent cycling stability (99.60 % Coulombic efficiency after 300 cycles) and specific capacity (779.9 mAh/g), and shows capacity rise. This study provides a new direction for the preparation of carbon-based electrode materials doped with heteroatoms and the study of capacitive energy storage mechanisms.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zexiang He,Deshun Huang,Guozong Yue,Jing Zhu,Pengxiang Zhao
Three-dimensional (3D) porous MXene gel (MXene-Ca) was synthesized through a fast gelation of Ti 3 C 2 T x MXene nanosheets initiated by calcium ions. The MXene-Ca showed efficient phosphate adsorption ability through the strong chemical reaction between Ca 2+ and phosphate with a fast adsorption equilibrium (within 2 min). Furthermore, the recovered P/MXene-Ca gel after phosphate sorption could be used for adsorption of uranium in aqueous solution. Various analysis including SEM, TEM, XRD, XPS, FT-IR, BET surface area and zeta potential were carried out to fully characterize the materials. Increased specific surface area of the 3D porous structure and the formation of newly active adsorption sites of hydroxyapatite in P/MXene-Ca gel, are two main factors promoting the removal of U(VI). The maximum adsorption capacity was 823.6 mg/g at 298 K by Langmuir isotherm model. Kinetic studies disclosed that the of U(VI) followed the major chemical adsorption process. Overall results from batch experiments, leaching experiments, and characterizations demonstrated that the main mechanisms of the U(VI) removal by P/MXene-Ca including chemical adsorption on hydroxyapatite via dissolution precipitation and surface complexation with the oxygen-containing functional groups of MXene.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Qiang Zhang,Yi Zhang,Sainan Liu,Huaming Yang
Halloysite nanotubes were investigated as a hard template for the preparation of multi-functional porous carbon due to their one-dimensional ordered structures and the composition of aluminosilicate . Herein, a novel N-doped three-dimensional porous carbon nanofiber (3D PCN) was obtained following electrospinning, pyrolysis and demineralization of natural halloysite. When used as anodes in Na + -batteries, the obtained 3D PCN exhibited a high specific capacity of 266 mAh·g −1 at a current density of 100 mA·g −1 and super cycling stability with a capacity retention of 91.1% after 5000 cycles at 1 A·g −1 . This work can not only extend the application of halloysite in energy storage but also provide a low-cost and promising three-dimensional porous carbon material for advanced Na + batteries .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Li Lv,Yinglin Wang,Pengfei Cheng,Bao Zhang,Fan Dang,Luping Xu
The preparation process and gas sensitivity test of three-dimensional sphere spinel ferrites with well-assembled macroporous structures have been reported in this paper. The three-dimensional ZnFe 2 O 4 macroporous spheres (3D ZnFe 2 O 4 MPs) were prepared by one-step ultrasonic spray pyrolysis (USP), in which self-assembly sulfonated polystyrene (S-PS) spheres were employed as sacrificial template. The as-prepared samples possessed interconnected macroporous with pore diameters about 200 nm can be observed in TEM characterization, which provided more reactive active sites. The catalyst Pd was doped in 3D ZnFe 2 O 4 MPs with the attempt of enhancing gas-sensing performance, which has been confirmed existed as Pd 2+ formation by XRD and XPS analysis. In a comparison with pure 3D ZnFe 2 O 4 MPs, the 0.5% PdO-dopded 3D ZnFe 2 O 4 MPs exhibited a 2 times higher response (18.9) to 100 ppm acetone at 275 °C. Furthermore, the PdO- dopded 3D ZnFe 2 O 4 MPs-based sensor also presented excellent selectivity and good long-term stability towards acetone. The outstanding sensing performance can be attributed to the 3D spheres with interconnect macroporous structure, electronic sensitization and catalytic effects of PdO. The relative sensing mechanism has been discussed in detail.
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
IONICS
·
2017
·Vol. 23
·期 9
·2377-2385
·
IF 2.062
Pan Guangxing,Song Yonghai,Miao Longfei,Wang Li
A novel ascorbic acid (AA) electrochemical biosensor based on ferrocene dicarboxylic acid (Fc(COOH) 2 )/zeolitic imidazolate framework-8 (ZIF-8)/three-dimensional (3D) kenaf stem-derived macroporous carbon (3D-KSCs) was proposed for the first time. The formation and properties of Fc(COOH) 2 /ZIF-8/3D-KCSs nanocomposites were characterized by scanning electron microscopy, Fourier transform-infrared spectroscopy, N 2 adsorption/desorption isotherms, X-ray powder diffraction, and energy dispersive X-ray spectroscopy. The results showed that a large number of short rod-like ZIF-8/Fc(COOH) 2 was arrayed on the 3D-KSCs surface via a simple one-step hydrothermal method. Fc(COOH) 2 was firmly encapsulated into the pores of ZIF-8 simultaneously during the synthesis process of ZIF-8. The Fc(COOH) 2 /ZIF-8/3D-KCSs nanocomposites were employed to prepare integrated Fc(COOH) 2 /ZIF-8/3D-KSCs electrode directly for electrochemical AA sensing, and the integrated electrode showed better performance for AA detection than traditional enzyme-based biosensors and nonenzymatic sensors. A wide detection range of 0.06 μM~5.01 mM and a low detection limit of 0.017 μM were obtained with good stability and selectivity. The work also sheds new light on developing ZIF-8-based nanocomposites for electrochemical sensing.
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研究领域:
材料科学
·
分析化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·808
·
IF 4.324
Yuhao Liu,Xiaoxiao Qu,Guangxu Huang,Baolin Xing,Fengmei Zhang,Binbin Li,Chuanxiang Zhang,Yijun Cao
Three-dimensional porous carbon is considered as an ideal electrode material for supercapacitors (SCs) applications owing to its good conductivity, developed pore structure, and excellent connectivity. Herein, using longan shell as precursor, 3-dimensional porous carbon with abundant and interconnected pores and moderate heteroatoms were obtained via simple carbonization and potassium hydroxide (KOH) activation treatment. The electrochemical performances of obtained 3-dimensional porous carbon were investigated as electrode materials in symmetric SCs with aqueous and solid electrolytes. The optimized material that is named after longan shell 3-dimensional porous carbon 800 (LSPC800) possesses high porosity (1.644 cm3g−1) and N content (1.14 at %). In the three-electrode measurement, the LSPC800 displays an excellent capacitance value of 359 F g−1. Besides, the LSPC800 also achieves splendid specific capacitance (254 F g−1) in the two electrode system, while the fabricated SC employing 1 M Li2SO4as electrolyte acquires ultrahigh power density (15930.38 W kg−1). Most importantly, LSPC800 electrodes are further applied into the SC adopting the KOH/polyvinyl alcohol (PVA) gel electrolyte, which reaches up to an outstanding capacitance of 313 F g−1at 0.5 A g−1. In addition, for the all-solid-state SC, its rate capability at 50 A g−1is 72.73% and retention at the 10,000th run is 93.64%. Evidently, this work is of great significance to the simple fabrication of 3-dimensional porous carbon and further opens up a way of improving the value-added utilization of biomass materials, as well as proving that the biomass porous carbons have immense potential for high-performance SCs application.Keywords:3-dimensional porous carbon;biomass;high nitrogen content;all-solid-state supercapacitors
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）