CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Fuming Wu,Jianping Gao,Saisai Zuo,Wei Wang,Haixia Qiu
In this paper, Cu 2 O-loaded S-doped worm-like hierarchical porous carbon flakes (SCu-HPCFs) have been prepared for supercapacitor applications by using cheap sweet potato starch as a raw material via a controlled carbonization–activation-hydrothermal reaction process. The as-prepared SCu-HPCFs possess hierarchical porous structure, large specific surface area (2543.68 m 2 g −1 ), s doping state and good electrical conductivity. The SCu-HPCFs electrode exhibits a high specific capacitance of 451 F g −1 at 1 A g −1 and good rate capability (retention of 79% from 1 to 15 A g −1 ). Moreover, the asymmetric supercapacitor assembled using the SCu-HPCFs as a negative electrode and NiO/RGO as a positive electrode shows a high energy density of 30.2 W h kg −1 at a high power density of 800.4 W kg −1 and can still achieve 23.5 W h kg −1 at 8070.9 W kg −1 . At the same time, it has excellent cycling stability (90.8% retention after 10,000 cycles). The high capacity performance can be attributed to rich porous structure, high specific area and pore volume, Faraday contribution caused by S doping and the fast redox reaction of Cu 2 O.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yiyuan Shi,Sisi Li,Zhimiao Tian,Xiansen Yang,Yubing Dong,Yaofeng Zhu,Yaqin Fu
The construction of three-dimensional (3D) hierarchically porous nanostructures is an effective microstructural design strategy for the fabrication of lightweight electromagnetic wave (EMW) absorption materials . In this work, 3D hierarchically porous Ti 3 C 2 T x MXene@polyaniline (PANI) hybrids are prepared via a self-assembly process. The as-prepared hybrids possess excellent microwave absorption performance with the minimum reflection loss ( RL min ) of the optimal Ti 3 C 2 T x MXene@PANI hybrid reaching − 53.79 dB at 12.67 GHz with a thickness of 1.33 mm and a loading amount of 10 wt% in paraffin. The light weight and high-efficiency microwave absorption properties of the hybrids result from their 3D hierarchically porous structure and well-matched impedance characteristics, which provide multiple reflection channels and loss mechanisms for incident EMWs. This strategy offers a rational, simple and practical design approach for high-performance MXene-based EMW absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 34
·50849
·
IF 3.125
Shao-Xia Zhang,Long Xu,Zhi-Hui Chen,Shu-Ting Fan,Zhen-Jiang Qiu,Zi-Jun Nie,Bang-Jing Li,Sheng Zhang
γ-cyclodextrin (CD)-metal-organic framework (MOF)-K is developed as a new kind of green template for the preparation of hierarchical porous carbon (HPC). Three-level porous structure (micro-, meso-, and macro-pores) has been successful constructed by calcined γ-CD-MOF-K at 600°C. The fabricated carbon (HPC-600) shows good microwave adsorption ability due to its unique hierarchical porous structure (macropores allow microwave enter the interior of the absorbents, and then micro- and meso-pores attenuate the incident microwave effectively by multiple reflections and polarization loss caused.) The minimum reflection loss (RL) is − 23.5 dB and the effective absorption bandwidth (EAB, RL≤− 10 dB) is 4.3 GHz. This work provides a good reference for efficient and environment-friendly microwave absorbents. In addition, the applications of HPC-600 may further expand to adsorption, sensing and supercapacitors due to the hierarchically porous structure.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Zekai Miao,Zhenkun Guo,Guofeng Qiu,Wenke Jia,Keran Jiao,Yixin Zhang,Jianjun Wu
Coal gasification fine slag (FS), classified as an industrial solid waste, is composed of residual carbon (RC) and slag particles (SP). The simultaneous utilization of RC and SP to prepare hierarchical porous composite (HTC) could realize the value-added utilization of FS. The role of SP in FS on HTC preparation is extremely vital and worthy of study. In this paper, FS was successfully used to synthesize HTCs for CO 2 adsorption. Orthogonal experiment was conducted to study the effect of SP on the properties of the synthesized HTCs. The changes of impregnation conditions could be effective for developing pore structure of HTCs and the surface area increased by 226 m 2 /g. Furthermore, the role of SP in FS on HTCs preparation was analyzed. After chemical activation, there was generation of many new pores in SP that the surface area and pore volume could reach 302 m 2 /g and 0.271 cm 3 /g. Besides, the leached metallic elements in the process of KOH impregnation could affect the mesopore development. The HTCs also proved to be attractive for CO 2 capture. The highest CO 2 adsorption capacity of 2.35 mmol/g at 25 °C was achieved with 5-PH-FSHCT sample. It also exhibited good selectivity of CO 2 over N 2 of 9.5. Furthermore, the sample had not only fast adsorption kinetics that it reached saturation levels in about 1.5 min, but also excellent regeneration efficiency 97% after ten cycles. All results suggest that FS has a great potential to be reused as a high performance adsorbent for practical and industrial CO 2 adsorption applications.
研究领域:
能源与环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
·
2020
·Vol. 51
·期 9
·1295-1303
·
IF 0.744
Y. Qian,H. Zhang,L. Li,Y. Duan
In this study, ZSM-5 zeolite with hierarchical porosity structure was synthesized by hydrothermal method using Al(OH) 3 , SiO 2 extracted from coal fly ash as aluminum source and silicon source. The optimal synthesis parameters of ZSM-5 zeolite were determined via an orthogonal analysis table. The optimum synthesis conditions were: SiO 2 /Al 2 O 3 /Na 2 O/hexadecyltrimethylammonium bromide/tetrapropyl ammonium bromide/H 2 O = 1/0.08/0.25/0.05/0.17/50, and the optimum crystallization temperature and crystallization time were 160 °C and 48 h, respectively. Scanning electron microscopy showed that the synthesized ZSM-5 zeolite exhibited a spherical shape. Nitrogen adsorption-desorption and Brunauer-Emmett-Teller measurement analysis displayed that the best sample ZSM-5 molecular sieve showed a typical type IV isotherm, and the micropores and mesopores coexisted in the sample, indicating the successful preparation of ZSM-5 zeolite with hierarchical porosity structure. The crystal growth of ZSM-5 under different hydrothermal conditions follows the “S” adjustment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Qin Li,Jing Zhao,Peng Li,Zhengrong Xu,Jie Feng,Bo Chen,Rui Liu
Promotion of oxygen reduction reaction (ORR) kinetics, to a large extent, depends on the rational modulation of the electronic structure and mass diffusion of electrocatalysts. Herein, a ferrocene (Fc)–assisted strategy is developed to prepare Fc-trapped ZnMo–hybrid zeolitic imidazolate framework (Fc@ZnMo-HZIF-50) and the derived Fe single atom coupling with MoC nanoparticles, coembedded in hierarchically porous N-doped carbon cubes (MoC@FeNC-50). The introduced Fc is utilized not only as an iron source for single atoms but also as a morphology regulator for generating a hierarchically porous structure. The redistribution of electrons between Fe single atoms and MoC nanoparticles effectively promotes the adsorption of O2 and the formation of *OOH intermediates during the ORR process. Along with a 3D hierarchically porous architecture for enhanced mass transport, the as-fabricated MoC@FeNC-50 presents excellent activity (E1/2 = 0.83 V) and durability (only 9.5% decay in current after 40000 s). This work could inspire valuable insights into the construction of efficient electrocatalysts through electron configuration and kinetics engineering.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2021
·
IF 3.846
Liangshuo Li,Shuhua Pang,Xin Fan,Yanfang Wang,Hua Cheng,Dong Fang,Lin Qin,Ming Deng,Zhouguang Lu
Aqueous supercapacitor shows a narrow operating voltage range because of the limitation of the water electrolysis, resulting in low energy density. In this work, a nanoporous MnO2 entangled hierarchical porous carbon skeleton (simplified to MHPC) has been successfully prepared. Aqueous asymmetric supercapacitor has been assembled by employing the MHPC as a positive electrode, a hierarchical porous carbon skeleton (HPC) as a negative electrode, and a neutral Na2SO4 aqueous solution as electrolyte. The assembled asymmetric supercapacitor can be stably charged in an aqueous medium in a wide voltage range of 0–2.5 V and delivers a maximum energy density of 20.8Wh/kg at a power density of 0.25 kW/kg and 25 kW/kg at an energy density of 11.1 Wh/kg in a 1 M Na2SO4 aqueous solution. This strategy provides a new idea for developing high-energy supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Desheng Liu,Pan Jiang,Xiaochun Li,Jianxi Liu,Lincheng Zhou,Xiaolong Wang,Feng Zhou
Combination of porous catalyst carriers and high-performance catalysts has attracted increasing attention due to their efficient, reusable and durable characteristics in water purification. Herein, we report a design of three dimensional printed hierarchical porous ceramics that can in-situ load metal-organic frameworks-based catalysts by facile hydrothermal treatment. The resultant supported catalysts with hierarchical features are capable to completely decompose organic dyes based on Fenton reaction, exhibiting the highest removal efficiency and dye degradation rate ( k obs ) of 99.68% and 0.2915 min −1 , respectively. Moreover, its catalytic degradation rates are much greater than other reported Fe-/Cu-based metal organic framework heterogeneous Fenton catalysts. The outstanding catalytic degradation performance towards organic dyes is ascribed to their large surface area, numerous active sites, and hierarchical matter transport channels in the interconnected porous networks. Also, the three-dimensional (3D) printed hierarchical porous catalysts demonstrate lasting degradation efficiency (>75%) over 50 reusable cycles. More importantly, two types of catalytic reactors, such as 3D-printed catalytic filter and impeller agitator, have been successfully manufactured by the present strategy. This work uncovers a novel strategy that not only enables complex and efficient multiscale porous 3D catalysts, but also presents considerable prospects in the aspects of functional devices for water treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Hedong Jiang,Xingke Ye,Yucan Zhu,Lingling Wang,Peng Zhao,Ziyu Yue,Jianliang Xie,Zhongquan Wan,Chunyang Jia
Hierarchical porous carbon (HPC) as binder-free electrode attracts enormous attention due to its favorable structure, which is advantageous for the improvement of supercapacitor capacitance and rate capability. In this paper, texture controllable HPC binder-free electrode with high capacitive performance is successfully prepared by polymerization induced phase separation method. Solvents with various viscosities and hydroiodic acid with various amounts are used to regulate the texture. The desired hierarchical porous structure endows the carbon material with a high specific surface area and ideal transportation paths. The optimized HPC binder-free electrode reaches a high specific capacitance of 180.6 F g −1 at 0.2 A g −1 in a two-electrode configuration in 6 M KOH. Surprisingly, the capacitance of the electrode still remains 79.1% (142.9 F g −1 ) at 100 A g −1 . Furthermore, energy density of the supercapacitor device ranges from 6.27 Wh kg −1 to 4.23 Wh kg −1 with the power density ranging from 100 W kg −1 to 46195 W kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Fen Ran,Kuiwen Shen,Yongtao Tan,Bowu Peng,Shaohua Chen,Weijie Zhang,Xiaoqin Niu,Lingbin Kong,Long Kang
Homopolymer PAN and triblock copolymer PAN- b -PMMA- b -PAN synthesized by RAFT polymerization were used to fabricate activated hierarchical porous carbon membranes by combining phase inversion , carbonization , and HNO 3 activation method; during the preparation process, a lot of micro- and meso-pores generated because of phase separation of PAN and microphase separation of PAN- b -PMMA- b -PAN. The hierarchical porous structure shortened ions transport paths and facilitated the rapid migration of electrolyte ions . When the polymer membrane was prepared by the casting solution with 5 wt% of PAN- b -PMMA- b -PAN and the electrochemical performance was tested at the current densities from 0.5 to 5 A g −1 , a high-end specific capacitance of 297.0 F g −1 and a capacitance retention of 75% were obtained in three-electrode configuration; this specific capacitance remained above 90% of initial value after 2000 cycles at 2 A g −1 in 6 M KOH aqueous solution. Moreover, symmetric supercapacitors assembled with the prepared materials achieved high energy density (15.8 Wh Kg −1 ) and power density (4000 W Kg −1 ) in 1 M Na 2 SO 4 solution. The unique features and structures endowed the electrode membrane with good capacitive performance in both three-electrode and two-electrode configuration, which can be used as electrode membranes for high-performance energy storage devices and other applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 44
·445501
·
IF 3.953
Qi Yu,Jin Zou,Guanwei Peng,Feng Gao,Yansha Gao,Guorong Fan,Shangxing Chen,Limin Lu
Herein, a facile ratiometric electrochemical method was developed for sensitive sensing of riboflavin (RF) based on hierarchical porous biochar (HPB) modified electrode. In this sensing system, the reference paracetamol (PA) was directly added into electrolyte solution without the requirement of complex immobilization process. HPB derived from KOH-activated Soulangeana sepals displays hierarchical porous structure, high specific surface area and rich oxygen-containing functional groups, which is favorable for RF adsorption and enrichment. Besides, the excellent electronic conductivity and superior electrocatalytic activity of HPB can effectively promote the electrooxidation of RF. Moreover, the dual-signal strategy greatly improves the reproducibility and reliability of electrochemical detection. Based on the proposed ratiometric sensing platform, the sensor exhibits a wider linear range of 0.0007–10 μM and a lower limit of detection of 0.2 nM. The method also presents good selectivity and has been applied to the determination of RF in milk samples with satisfactory results.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Yaohui Qu,Zhian Zhang,Xiahui Zhang,Guodong Ren,Xiwen Wang,Yanqing Lai,Yexiang Liu,Jie Li
Sulfur has a high specific capacity of 1675 mAh g −1 as lithium battery cathode, but its rapid capacity fading due to polysulfides dissolution presents a significant challenge for practical applications. Here we report a novel hierarchical porous honeycomb carbon (HPHC) for lithium-sulfur battery cathode with effective trapping of polysulfides. The HPHC was prepared by a simple template process, and a sulfur-carbon composite based on HPHC was synthesized for lithium-sulfur batteries by a melt-diffusion method. It is found that the elemental sulfur was dispersed inside the three-dimensionally hierarchical pores of HPHC based on the analyses. Electrochemical tests reveal that the sulfur-HPHC composite shows high rate capability and long cycling stability as cathode materials. The sulfur-HPHC composite with sulfur content of 66.3 wt% displays an initial discharge capacity of 923 mAh g −1 and a reversible discharge capacity of 564 mAh g −1 after 100 cycles at 2 C charge-discharge rate. In particular, the sulfur-HPHC composite presents a long term cycling stability up to 300 cycles at 1.5 C. The results illustrate that the electrochemical reaction constrained inside the interconnected macro/meso/micropores of HPHC would be the dominant factor for the excellent high rate capability and long cycling stability of the sulfur cathode, and the three-dimensionally honeycomb carbon network would be a promising carbon matrix structure for lithium-sulfur battery cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）