APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Sathish Reddy,Ran Du,Lixing Kang,Nannan Mao,Jin Zhang
Preparation of electrocatalysts with high activity and low cost are essential for mass production of hydrogen. However, preparation of such catalyst are still highly challenging thus far. In this paper, we focus on preparation of a three- dimensional CNTs aerogel/MoS x catalyst by using solvothermal process. The MoS x material has been successfully combined with three- dimensional CNTs aerogel and creates a sufficient active site exposure as well as 3D conductive networks for fast charge transport. Due to this the catalyst exhibited high activity for HER with a small onset over potential of ∼150 mV, a Tafel slope of 62 mV dec −1 , and an exchange current density of 6.4 mA cm −2 . The catalysts also show excellent stability during long-term 1000 cycles and electrolysis confirm the durability of the catalyst. The enhanced performance is attributed to synergistic effects of CNTs aerogel and MoSx, which enhance the activities for both components for HER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wei Yu,Wenhua Dai,Zixin Hong,Guoxian Li,Ziying Wang,Chuizhou Meng,Jiaping Wang,Changhong Liu,Shijie Guo,Shoushan Fan
Efficient heat transfer control is highly demanded for dynamic thermal management of equipment and buildings especially when the environmental temperature dramatically changes. Thermal switches, the current approach of heat transfer control, suffer from the issues of low switching ratios below eight and sharp state transition between “on” and “off”. Herein, a continuously-tuned thermal regulator with an ultrahigh thermal-conductivity change ratio of 43 based on superaligned carbon nanotube aerogel is reported, which works on the regulation of both thermal interfacial resistance and conduction pathways by compressive deformation-induced microstructure evolution. This thermal regulator can stabilize the device temperature at 25 °C when the environmental temperature varies by 7 and 11 °C under the natural convection and forced convection conditions, respectively. Toward practical application, the thermal regulator with flexibility is wrapped around a cylindrical lithium-ion battery to control the operation temperature within the optimal range of 20–40 °C for enhanced discharging performance even at an environmental temperature of −20 °C. Besides, by combining the thermal regulator with radiative cooling film, the house model temperature can be lowered by 2.7 °C during daytime and raised by 1.1 °C during nighttime compared with the bare one. This efficient thermal regulation approach offers an effective solution for practical thermal management.
研究领域:
材料科学
·
能源工程
·
建筑技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dong Li,Weiyu Wang,Jie Liu,Maoshuai He
Lithium-sulfur (Li-S) battery has been recognized as a new energy storage device with broad prospects because of its satisfactory specific capacity and theoretical energy density. Nevertheless, the shuttle effect of polysulfides seriously hinders the real applications of high-sulfur-loaded Li-S batteries. To remove the hurdle, hierarchical lamellar single-walled carbon nanotube aerogels (SWCNTAs) are herein fabricated and applied as multifunctional interlayers in Li-S batteries, which exhibit an initial area-specific capacity as high as 7.1 mAh cm −2 at a sulfur loading of 8.02 mg cm −2 . The introduced SWCNTA interlayers can lower the internal resistance and suppress the shuttling of polysulfides by a layer-by-layer physical blocking mechanism. Moreover, owing to the super wettability of SWCNTAs, electrolytes with a dosage of 10 μL mg −1 could effectively wet and infiltrate the interlayers, rendering the lean-electrolyte Li-S batteries a high specific capacity of 559 mAh g −1 at a sulfur loading of 10.35 mg cm −2 after 60 cycles. This work presents an example for rationally designing the interlayers structures for high-sulfur loading batteries, which paves a stepping stone for the future commercialization of Li-S batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wenlong Liang,Biao Wang,Jingli Cheng,Douxin Xiao,Zhengang Xie,Jinhao Zhao
To alleviate the secondary risks of using metal-organic frameworks (MOFs) nanoparticles as adsorbent, a novel method of loading two MOFs (ZIF-8 or UiO66-NH 2 ) on the carbon nanotube aerogels (MPCA) by in situ nucleation and growth of MOFs nanoparticles onto carbon nanotubes were developed. The prepared MOFs@MPCA aerogels were well characterized via SEM, TEM, EDS, FT-IR, XRD and XPS to reveal the microstructure and formation mechanism of MOF@MPCA. Besides, the hydrophilia, mechanical property and thermostability of MOF@MPCA were investigated. The results showed that MOF@MPCA had good hydrophilia, compression resilience and thermostability. The study on the ability to adsorb herbicides (chipton and alachlor) showed that the adsorption capacity of MOF@MPCA was stronger compared with single MOFs nanoparticles, which indicated that there was a synergistic effect between MOFs and MPCA. The equilibrium adsorption capacity of chipton adsorbed by UiO66-NH 2 @MPCA was 227.3 mg/g, and can be expediently reused for 5 cycles without a significant decrease in adsorption performance. Moreover, the results of biosafety experiments showed that MPCA can reduce the risk of MOFs nanoparticles leakage into the environment and accumulation in organisms. This work can provide a new research idea, which has potential applications to remove pollutants effectively and safely from the environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 22
·5495-5504
·
IF 4.495
Chuang Zhang,Ben Ma,Yingke Zhou
Graphical 3D N-doped CNT aerogel is facilely synthesized by pyrolysis of the template polymerized PPy, and displays superior ORR activity and stability due to the dominant role of the graphitic-N and the graphitization degree of the carbon materials. A novel N-doped carbon nanotube aerogel has been synthesized by pyrolysis of the three-dimensional tubular polypyrrole networks and evaluated as a metal-free electrocatalyst for the oxygen reduction reaction. The carbon aerogel catalysts are pyrolyzed at 500 °C (PPy/C-500), 700 °C (PPy/C-700), 900 °C (PPy/C-900) and 1050 °C (PPy/C-1050), and display the pyrolyzed temperature-dependent activity and stability. The catalytic activity is increased with the increase of pyrolysis temperature from 500 °C to 1050 °C, ascribed to the high electronically conductive graphitic phases, the thin wall of the three-dimensional tubular carbon aerogel framework and the increased effective active sites. The nitrogen content is reduced with the increase of pyrolysis temperature, and which plays an important role in the stability of the pyrolyzed catalyst. After 1500 cycles, the PPy/C-1050 catalyst shows more positive half-wave potential than the commercial Pt/C catalyst, and displays a quasi-four-electron pathway toward the oxygen reduction reaction in the acid solution. This work provides an effective strategy for preparing the low cost and metal-free N-doped carbon aerogel catalyst from the conjugated conducting polymer, to achieve high activity and stability.
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 CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yuyang Liu,Xuemin Liu,Yaping Zhao,Dionysios D. Dionysiou
The self-assembled synthesis of a hierarchical graphene oxide (GO)-carbon nanotubes (CNTs)-α-FeOOH decorated composite aerogel (α-FeOOH@GCA) through a facile in-situ hydrolysis route is reported for the first time and the materials was tested for its performance as Fenton-like catalyst. The introduction of GO-CNTs clearly mediated the morphology to aligned α-FeOOH nanorods ( ca. 100 nm) within aerogel matrix comparing with pristine urchin-like α-FeOOH three-dimensional microstructures ( ca. 1 μm). This three dimensional porous aerogel network provided efficient charge/mass-transfer leading to great enhancement of the catalytic activity of α-FeOOH. The outstanding catalytic performance of this composite in degradation of organics with different charge and structure, i.e. Orange II (OII), rhodamine B (RhB), methylene blue (MB), phenol and endocrine disruptor bisphenol A (BPA) was demonstrated. For example, the discoloration of OII with pseudo first-order rate constant of 0.10 min −1 significantly exceeded that of pristine α-FeOOH. At relatively low concentration of α-FeOOH@GCA catalyst (125 mg L −1 ) and H 2 O 2 (0.55 mM) showed excellent catalytic activity for efficient (∼99%) discoloration of OII (40 mg L −1 ) under a 60 min UV 365 irradiation in the pH range 3–10. The different charge of five target contaminats greatly determined the surface-catalyzed degradation kinetics at natural solution pH in the order of cationic > neutral > anionic organics due to the negatively charged carbon-based aerogel matrix. The new identified desulfonation intermediates elucidated through UPLC–MS analysis indicated two reaction pathways: 1) hydroxylation and 2) desulfonation by-products followed by cleavage of the azo bond as the predominant degradation pathway of OII. The elimination of the acute toxicity of the parent contaminant to luminescent bacterium Q67 was consistent with the formation of less toxic degradation by-products identified. Free radical quenching studies accessed the role of hydroxyl radical ( OH), superoxide anion radical (O 2 − ) and singlet oxygen ( 1 O 2 ) as the dominating reactive oxygen species (ROS). The quantitative studies to measure radical concentrations using relative molecular probes showed the effective activation of H 2 O 2 led to high rate production of ROS accounted for OII degradation. The greatly enhanced photocatalytic property of this hybrid was correlated with the efficient conversion between Fe 2+ /Fe 3+ and synergistic coupling between α-FeOOH and carbon-based aerogel matrix evidenced through the formation of Fe O C chemical bonds was verified by X-ray photoelectron (XPS) analysis. Based on its simple and scalable preparation route as well as its excellent UV 365 or visible light-responsive catalytic performance, this hybrid exhibits a high potential to be used as an efficient and environmental-friendly catalyst for water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Zixun Wang,Chen Chen,Lin Fang,Bao Cao,Xinbo Tu,Renyun Zhang,Kai Dong,Ying-Chih Lai,Peihong Wang
With the rapid development of sensors and triboelectric nanogenerators (TENGs), multifunctional self-powered sensors have received extensive attention. In this study, we prepare cellulose carbon nanotubes aerogel TENG (CCA-TENG) with high output, moisture-proof, simplified structure, and biodegradability for ambient energy harvesting and self-powered sensing. The cellulose carbon nanotubes aerogel (CCA) can be used not only acts as a tribolayer, but also as an electrode, with the characteristics of a 3D porous structure , high specific surface area, and dielectric enhancement. CCA-TENG exhibits improved output performance due to the advantages of the enhanced dielectric constant and 3D porous structure. Since regenerated cellulose is a dense polymer, it still keeps high output performance under high humidity. More importantly, CCA-TENG can be rapidly degraded in cellulase, and the output performance of the CCA-TENG prepared from recycled CNTs reaches 91.04% output of the original TENG. This study demonstrates the preparation, degradation, and reuse of CCA-TENGs and their applications, providing new avenues for high-performance, moisture-proof, and ambient self-powered systems.
研究领域:
纳米技术
·
能源材料
·
自供电传感器
·
可持续电子器件
·
可穿戴设备
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Jiayi Xie,Yinglin Yan,Yiming Zou,Rongfu Xu,Zhiying Meng,Nana Zhao,Lisheng Zhong,Xianhui Wang,Rong Yang,Yunhua Xu
The development of free-standing hosts represents an effective strategy for enhancing the energy density and cycling stability of lithium‑sulfur (Li S) batteries. This study proposes a CNT aerogel-modified wood-derived carbon skeleton as a free-standing host for Li S battery cathodes. The anisotropic microchannels of wood are preserved to accelerate electrolyte transport, while the homogeneous filling of CNTs within these microchannels introduces abundant active sites for polysulfide adsorption and a large specific surface area for sulfur loading. Additionally, this design significantly improves the electrical conductivity. The free-standing CBW/CNT@S cathode demonstrated a high initial discharge capacity of 1218.2 mAh g −1 and excellent cycling stability (retaining 900.4 mAh g −1 after 100 cycles at 0.1C). Even at 0.5C, it maintained 509.8 mAh g −1 after 600 cycles. Under a high sulfur areal loading of 7.96 mg cm −1 , a discharge capacity of 664.5 mAh g −1 was achieved. Electrochemical impedance spectroscopy and cyclic voltammetry at varying scan rates confirmed enhanced electrochemical kinetics and improved polysulfide adsorption ability. Overall, the synergistic integration of CNTs with wood-derived carbon hosts serves as a validated strategy for optimizing Li S battery performance, providing foundational insights for the rational design of next-generation energy storage systems.
研究领域:
材料科学
·
储能
·
电化学
·
纳米技术
·
复合材料
·
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）