Energy Technology
·
2021
·Vol. 9
·期 7
·2001086
·
IF 3.631
Lin Li,Shijie Li,Tao Zeng,Lisheng Deng,Hongyu Huang,Jun Li,Noriyuki Kobayshi,Lin Liu,You Zhou
3D Graphene (3D-GF) modified with different additive concentrations (phytic acid [PA] and ascorbic acid [AA]) is developed and then combined with different LiOH contents by the hydrothermal method to obtain composite materials. It can be found that the addition of PA and AA will not destroy the carbon skeleton structure of 3D-GF. With increasing additive content, the thermal conductivities of modified 3D-GF first increase and reach their maximum values at 8 mg mL −1 . The modified 3D-GF with the highest thermal conductivity is selected to be combined with different LiOH contents. The addition of PA and AA can broaden the charging temperature range from 60–110 to 30–200 °C and improve the LiOH hydration rate and heat storage density. Compared with the PA-modified composite, the AA-modified composite shows smaller (about 7.6 nm) and more uniform LiOH·H 2 O particles (the particles size standard deviation of 3D-GF-AA-LiOH·H 2 O is 1.1503), a larger specific surface area (119 m 2 g −1 ), higher heat storage density (the highest value of 2763 kJ kg −1 for LiOH⋅H2O, which can be about 4.2 times of pure LiOH), and less influenced by the change of LiOH content (the thermal conductivity standard deviation of 3D-GF-AA-LiOH·H 2 O is 0.123).
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 83
·79459-79469
·
IF 3.289
Yue Guan,Zhiyu Dou,Yan Yang,Juanhong Xue,Zhen Zhu,Lili Cui
We have synthesized hierarchically 3D porous Fe5C2/N-doped graphene (3D Fe5C2/N-PG) with numerous micro/meso-pores by a controllable and facile strategy. The density of the micro/meso-pores can be accurately tailored by adjusting the reaction conditions. It is found that the ORR performance of the electrocatalyst is strongly dependent on the pore structures under the same conditions. The electrocatalyst exhibits comparable activity in an acidic solution together with superior activity in an alkaline solution to the state-of-the-art Pt/C catalyst in terms of onset potential, half-wave potential, diffusion-limiting current density and kinetic current density. The excellent electrocatalytic activity is attributed to the balance of the surface area, hierarchical porosity, chemical composition (pyridinic N, graphitic N and Fe5C2 nanoparticles) and conductivity of the 3D interconnected graphene. This strategy for the tunable synthesis of hierarchically 3D porous graphene materials offers a platform for developing catalysts with superior activity in energy devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 5
·1901170
·
IF 3.217
Liping Wang,Bingli Pan,Jiayu Gao,Saisai Huang,Mengxin Xie,Chunyan Li,Denglin Luo,Jichun Liu,Honggang Wang
A porous 3D graphene lubricant is designed using a polyurethane (PU) foam vehicle and a self-lubricating composite is thereafter prepared by pouring monomer casting polyamide 6 (MCPA6) into the 3D graphene lubricant. The microstructure of the composite is studied using infrared (IR), thermogravimetric analysis (TGA), X-ray diffractometer (XRD), and scanning electron microscopy (SEM). The results of tribological properties and mechanical properties show that the composite exhibits enhanced tribological behaviors while inheriting excellent mechanical properties of neat MCPA6; the wear resistance of the composite is over 160 times higher than that of neat MCPA6 (1.3 m s −1 , 140 N). The friction and wear mechanism of the composite is determined. The designed porous 3D graphene composite shows the merits of the increased friction reduction and antiwear performances with decreased loading content of graphene. This research opens a new insight for designing 3D graphene composite in severe tribological conditions.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Hongyu Liang,Yongfeng Bu,Fuping Pan,Junyan Zhang
Transforming carbon-containing wastes into useful porous carbon materials is highly desired. The strategy can not only relieve environmental pollution but obtain porous carbon electrodes for energy storage devices. Herein we report an efficient method to transform the ozone-depleting gas of Freon (CCl 3 F) into 3D graphene (3DG) frameworks for supercapacitor electrode materials . The 3DG possesses self-supporting interconnected meso- and macropore channels supported by the multilayer graphene frameworks, which can be well kept in actual 3DG electrodes. This characteristic, together with high conductivity, enables 3DG supercapacitors to present high rate performance through the effective synergy between ion and electron transports , thus achieving the high capacitance retention of 76.1% (156 F g −1 at 100 A g −1 ) relative to the original capacitance (205 F g −1 at 1 A g −1 ), as well as high energy density retention (42.3% at 100 A g −1 ). The capacitance retention is much higher than that of typical reduced graphene oxide , and comparable to those of the reported state-of-the-art carbon-based materials. This study provides new strategy to dispose carbon-rich environmental pollutants for useful porous carbon electrode materials.
研究领域:
材料科学
·
环境科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Qiuqi Zhang,Xiao You,Huiying Ouyang,Yuanhang Yang,Zhenzhong Xing,Haodong Gu,Li Tian,Qingliang Shan,Xiangyu Zhang,Jinshan Yang,Shaoming Dong
In this work, a high-performance electromagnetic wave (EMW) absorber is prepared by the in situ growth of BN and SiC into a self-assembled 3D graphene skeleton via chemical vapor infiltration (CVI). The porous conductive graphene network extends the transmission path of incident microwaves by multiple scattering, and the ceramic coating effectively improves the impedance matching degree. Notably, the EMW absorbing performance of 3D-rGO/BN/SiC can be regulated by the high-temperature oxidation in air. Compared to the original absorbers, after being oxidized at 600 °C for 4 h in air, the optimal RLmin of the composites drops to −47.1 dB and the broadest EAB reaches 11.96 GHz, which can be attributed to the enhanced impedance matching degree. The controllable fabrication of 3D-rGO/BN/SiC composites can provide a guideline for rational design and fabrication of high-performance EMW absorbing materials in practical applications under medium oxidizing temperature.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 13
·4555-4566
·
IF 4.39
Ishaq Muhammad,Maher Jabeen,Peiran Wang,Yu-Shi He,Xiao-Zhen Liao,Zi-Feng Ma
The advancement of novel synthetic approaches for micro/nanostructural manipulation of transition metal phosphide (TMP) materials with precisely controlled engineering is crucial to realize their practical use in batteries. Here, we develop a novel spray-drying strategy to construct three-dimensional (3D) N,P co-doped graphene (G-NP) microspheres embedded with core–shell CoP@C and MoP@C nanoparticles (CoP@C⊂G-NP, MoP@⊂G-NP). This intentional design shows a close correlation between the microstructural G-NP and chemistry of the core–shell CoP@C/MoP@C nanoparticle system that contributes towards their anode performance in lithium-ion batteries (LIBs). The obtained structure features a conformal porous G-NP framework prepared via the co-doping of heteroatoms (N,P) that features a 3D conductive highway that allows rapid ion and electron passage and maintains the overall structural integrity of the material. The interior carbon shell can efficiently restrain volume evolution and prevent CoP/MoP nanoparticle aggregation, providing excellent mechanical stability. As a result, the CoP@C⊂G-NP and MoP@⊂G-NP composites deliver high specific capacities of 823.6 and 602.9 mA h g−1 at a current density of 0.1 A g−1 and exhibit excellent cycling stabilities of 438 and 301 mA h g−1 after 500 and 800 cycles at 1 A g−1. The present work details a novel approach to fabricate core–shell TMPs@C⊂G-NP-based electrode materials for use in next-generation LIBs and can be expanded to other potential energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 8
·4815-4825
·
IF 3.917
Yang Xixian,Li Shijie,Zhang Shiyi,Chen Xin,Peng Shuai
Abstract Commonly used nanocarbon composite materials are routinely synthesized from petroleum-based resources. To avoid their bad impact on the environment, using cellulose-based materials as the promising resources is a better choice due to its easy acquisition and rich reserves. In this study, microcrystalline cellulose was selected as the carbon precursor to synthesize novel cellulose-derived 3D-graphene/LiOH·H 2 O nanomaterials for chemical heat storage to improve the efficiency of thermal energy utilization. The characterization and performance test results show that LiOH·H 2 O particles (5–20 nm) were highly dispersed on the 3D graphene carbon skeleton. These materials had excellent heat storage densities and thermal conductivities due to a completely new, hydrophilic, nano-reactive interface on 3D graphene. Among the materials, 3D-GF-VC-LiOH·H 2 O (Ascorbic acid-modified 3D-graphene/LiOH·H 2 O) exhibited the best heat storage and thermal conductivity properties. It achieved a thermal conductivity of 2.6 W/m K, which was 1.5 times that obtained with pure LiOH·H 2 O, and its heat storage density (2157 kJ/kg) was 3.3 times that of pure LiOH·H 2 O (661 kJ/kg). The activation energy could decrease to 27.5 kJ/mol. Moreover, the heat storage temperature range of LiOH·H 2 O was clearly expanded by introduction of 3D graphene. Hence, the addition of cellulose-derived 3D graphene is a very efficient means by which the design of chemical heat storage materials can be improved. Graphical abstract
研究领域:
材料科学
·
能量存储
·
纳米技术
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Zihan Chen,Xihong Zu,Liheng Chen,Yi Qi,Wenbin Jian,Yaoying Wu,Wenli Zhang,Xuliang Lin,Guobin Yi,Quanbing Liu,Zilun Tang,Jianyu Wu,Huafeng Dong,Yanlin Qin
The development of high-performance flexible supercapacitors is desperately desired for application in wearable electronics, but the fabrication of a flexible self-supporting 3D electrode with light weight and high energy density remains challenging. Herein, we report an approach to fabricate the flexible self-supporting and lightweight 3D G-PPy@Fe-MnCo2O4 hierarchical electrode for flexible solid-state supercapacitors (FSSCs), which utilizes the active material 3D G-PPy as a substrate to vertically grow Fe-MnCo2O4 nanowire (NW) arrays. Importantly, the experimental results and DFT simulations indicate that Fe-MnCo2O4 NWs obtain metallic characteristics by doping Fe into a MnCo2O4 lattice, which induces the free propagation of electrons in the electrode. Thus, MnCo2O4 utilization efficiency and cycle performance are both greatly enhanced. The electrode has a high areal specific capacitance of 5136 mF cm–2 (422.4 F g–1) at 2 mA cm–2 with long-term cycle stability. The capacitance retention is about 94.7% after 7000 cycles. It presents a viable design route toward advanced wearable energy storage devices.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2557-2574
·
IF 11.806
Lai Changwei,Guo Yao,Zhao Huihui,Song Haixiang,Qu Xiaoxiao,Huang Mina,Hong Suck Won,Lee Kwan
The double ion-buffering reservoirs of asymmetric supercapacitors (ASC) have drawn enormous interest due to their excellent electrochemical performance. Herein, we have prepared the hierarchical porous sandwich-like Co 3 O 4 -rGO-CNT > N-PEGm (Co 3 O 4 -RGOC, in which rGO was short for reduced graphene oxide and CNT > N-PEGm was modified with methoxypolyethylene glycol by nitrene chemistry) ternary composites via a solvothermal method. Remarkably, the Co 3 O 4 -RGOC composites exhibited unique structural features of the opened honeycomb-like structures as “ion-buffering reservoirs.” Moreover, in Co 3 O 4 -RGOC composites, both the intermediate sandwich layers of rGO sheets and the interpenetrating CNT > N-PEGms can form double conductive networks as express electron transport channels to improve the electronic conductivity by synergistic effect. The promising Co 3 O 4 -RGOC composites can be summarized as capacity of 138.5 mAh g −1 (capacitance of 1420.5 F g −1 ) at 0.5 A g −1 . Furthermore, the 3D rGO-PANI (PANI, polyaniline) aerogels as negative electrode materials also have been prepared by facile in situ polymerization and chemical reduction process. The 3D rGO-PANI presented excellent electrochemical performance of 218.8 F g −1 (capacity of 60.8 mAh g −1 ) at 0.5 A g −1 due to the hierarchical interconnected porous network structures. Finally, the corresponding asymmetric supercapacitors of Co 3 O 4 -RGOC//3D rGO-PANI devices exhibited a high energy density of 41.3 Wh kg −1 at power densities of 775 Wk g −1 with excellent electrochemical performance and long cycle performance. Our work can present a new concept to design the innovative asymmetric supercapacitors with double ion-buffering reservoirs as a combinatorial strategy for useful energy storage and conversion.
Graphical abstract
The novel double “ion-buffering reservoir” asymmetric
supercapacitors are fabricated with the double conductive networks of
battery-type Co 3 O 4 -RGOC ternary composites as positive
electrode and 3D rGO-PANI aerogels as negative electrode for energy storage-conversion application.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 21
·12853-12869
·
IF 12.732
Tahereh Sadeghian Renani,Seyyed Mehdi Khoshfetrat,Jalal Arjomandi,Hu Shi,Sadegh Khazalpour
Great efforts have been made to design and fabricate low-cost, high efficiency advanced electrode materials for energy storage devices such as batteries and high-performance supercapacitors. Choosing organic and redox active species that increase the faradaic charge storage of electrode systems has thus become a challenge to increase energy density and conductivity. To this aim, herein, azure A/3D graphene aerogel (Az–GA), and trypan (Try) blue–nickel metal–organic framework (Try–Ni-MOF) nanosheet array redox active electrodes are fabricated via a hydrothermal method and used in an asymmetric supercapattery. Az links to 3D GA via π–π interactions to form an anode. A nickel chloride hexahydrate array combines with Try as a MOF to form a cathode. These redox active materials increase the faradaic charge storage of the system. The as-prepared asymmetric device shows a high specific capacitance of 319 F g−1 at 1 A g−1, a specific energy of 66.55 W h kg−1, a specific power of up to 4.45 kW kg−1, and a higher capacity retention of 92.12% after 5000 charge–discharge cycles at 10 A g−1. This device exhibits a broad potential window of 1.60 V and represents a promising strategy toward safe and sustainable energy storage devices.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wu Huixiang,Huo Danqun,Zhao Yanan,Ma Na,Hou Jingzhou,Liu Miao,Shen Caihong,Hou Changjun
In this study, a simple, robust and effective electrochemical sensor was constructed for ultrasensitive and selective detection of organophosphorus (OPs). DCNP (diethylcyanophosphonate, a nerve agent mimic) was selected as a representative OP to investigate the analytical performance of the presented sensor. 3 dimession graphene-gold nanoparticles (3DGH-AuNPs) composites were simply synthesized via one-pot hydrothermal reaction and characterized using TEM and XRD. Preparation of 4-aminoacetophenone oxime (APO) was performed via oximation reaction of 4-aminoacetophenone using hydroxylamine hydrochloride and characterized by FT-IR. And analytical performance of GCE/3DGH-AuNPs/APO based sensor for DCNP discrimination was carried out under optimized detection condition. A decent linear relationship for DCNP was obtained in the range from 1 × 10 −11 to 7 × 10 −8 M, with low detection limit of 3.45 × 10 −12 M. Additionally, the presented sensor displayed decent selectivity towards not only DCNP, but also other OPs, such as diphenyl chlorophosphate (DCPP), dimethoate, fenitrothion etc. And reproducibility and stability of the sensor were also evaluated. These results demonstrated that the presented electrochemical sensor can be a promising sensing platform for OPs analysis.
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2018
·
IF 2.526
Chengqiang Ding,Ziqian Li,Wensheng Tan,Hongda Li,Jianfeng Ma,Zhongping Chen,Yongxin Tao,Yong Qin,Yong Kong
A novel ultraviolet (UV)- and visible-light-active 3D graphene aerogels (3DGA)/Sb 2 WO 6 hybrid photocatalyst was prepared by electrostatic self-assembly (ESSA) method. The photocatalytic activity of the 3DGA/Sb 2 WO 6 hybrid was studied by monitoring the change in the concentration of methyl orange (MO) under UV-light and visible-light irradiation. The results demonstrated that the as-prepared hybrid exhibited significantly enhanced efficiency for the photodegradation of MO in comparison with pure Sb 2 WO 6 . This was ascribed to the efficient separation of the photogenerated electrons (e–) and holes (h + ) with the aid of 3DGA as well as the generated reactive superoxide radical anions (O 2 •–). Moreover, the 3DGA/Sb 2 WO 6 hybrid exhibited high recyclability, because the highly hydrophobic 3DGA in the hybrid was very advantageous to the separation of the hybrid photocatalyst from the MO solutions.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 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）