JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiachen Li,Shengwen Li,Jun Pu,Chenglin Zhong,Qingwen Zhou,Zihan Shen,Huigang Zhang,Haixia Ma
Fe-doped Ni 2 P nanoparticles have been fabricated on wrinkled graphene (rGO@Fe–Ni 2 P NPs) by a facile hydrothermal reaction followed by phosphorization. By adjusting the content of iron in Fe–Ni 2 P, optimal OER performance is achieved (Ni/Fe = 1.67). rGO@Fe–Ni 2 P displays pronounced alkaline OER activity with a small overpotential (260 mV vs RHE) at a current density of 10 mA cm −2 , and a low Tafel slope (35.7 mV dec −1 ) with long-term durability (17 h). The superior catalytic performance of rGO@Fe–Ni 2 P is attributed to the rational incorporation of iron into Ni 2 P, leading to a higher valence of nickel with more oxidation ability and inducing faster OER process. In addition, highly conductive graphene promotes electron transfer for oxygen generation, improves the stability of the catalyst, and provides more active sites facilitating the OER process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiaowei Ma,Mao Huang,Juan Jia,Han Wang,Jing Wang,Yanyan Zhu
Rational design porous nanomaterials with high specific surface area (SSA) have become an effective approach to improve their electrocatalytic activity, and thus enhancing the electrochemical sensing performance. However, increasing of SSA generally accompanied by magnifying the background current signal, which results in the electrochemical sensors may not achieve the optimal sensing performance. For porous nanomaterials, not only the appropriate SSA but also the pore size probably impacts the electrochemical sensing performance, while this aspect has seldomly studied in electrochemical sensor. Herein, the different SSA and pore size of graphene frameworks (GFs) are successfully synthesized by adjusting the ratio of the mixture of glucose and Na 2 CO 3 via one-step fast pyrolysis process. The tailored GFs has been used as electrode material for constructing non-enzymic electrochemical sensor with catechol (CC) used as model analyte. Electrochemical analysis result suggests that GFs with the highest SSA do not obtain the best behavior, while GFs with abundant hierarchical pore structure and relatively large SSA can achieve the best performance. The optimized GFs as electrode materials for electrochemical detection of CC exhibit a low detection limit of 0.19 μM, and a relatively wide linear range between 1 and 201 μM. This work provides a guide for developing new porous carbon materials for electrochemical sensor with better performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2017
·Vol. 1
·期 7
·1557-1567
·
IF 0
Haiyan Duan,Tingting Yan,Zhenying Li,Guorong Chen,Jianping Zhang,Liyi Shi,Dengsong Zhang
As one of the most desired alternatives for supercapacitor electrodes, three-dimensional graphene-based materials have attracted massive attention. However, they are still far from meeting the requirements for feasible and promising applications due to their low accessible surface area, poor electrical conductivity, unavailable interconnected self-supported frameworks, and complicated fabrication process. Herein, we originally and rapidly fabricated self-supported three-dimensional bubble-like graphene frameworks via the simpler and greener photopolymerization, which can be completed in a few seconds. The obtained graphene frameworks feature interconnected bubble networks composed of few-layered graphitic membranes, which are spatially and mutually supported. Besides, the simultaneously achieved huge available surface area, excellent conductivity, and superior wettability of the graphene frameworks can ensure sufficient active sites and promote efficient ion transportation, which can synergistically result in superior electrochemical performance when used as an electrode for supercapacitors. The resultant graphene-based supercapacitors exhibit a high gravimetric capacitance of 277 F g−1 at 1 A g−1, a remarkable rate-capability maintained at a level of 85% even at 50 A g−1 and superior cycling stability with 94% capacitance retention and ∼100% coulombic efficiency after 10 000 cycles at 5 A g−1. A soft package symmetrical supercapacitor is also successfully assembled to power light-emitting diodes to demonstrate the promising application of the graphene frameworks. Therefore, the self-supported graphene bubble-networks overcome the defects of currently available graphene products and open avenues for fabricating high-performance, low-cost, high-quality graphene-based electrodes useful for supercapacitors.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Hongli Cheng,Gaojie Han,Mengjie Su,Chengen He,Chuntai Liu,Yuezhan Feng
To construct a high-efficiency thermally conductive graphene nanoplate (GNP) framework, ball-milling technique and silver nanowires (AgNW) bridging strategy were employed to improve the compatibility of GNP and the interfacial thermal resistance (ITR) in GNP skeletons, respectively. By using unidirectionally freeze casting technique, long range ordered GNP frameworks containing a small amount of AgNW as “bridge” were obtained, which were used to encapsulation phase change material (PCM). As a result, the honeycomb-like micropores of the framework with strong capillary effect give PCM anti-leakage and shape stability. The vertically aligned and AgNW bridged GNP skeletons form high-speed heat transfer paths endowith low ITR, thus significantly improve thermal conductivity to 7.24 W/mK. More importantly, GNP framework with strong light absorption ability endows PCM with well solar-to-heat conversion and storage ability. Therefore, AgNW bridged GNP framework endowing PCM with comprehensive thermal management ability exhibits a high potential in addressing the thermal problems of electronics.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Li Ji,Guannan Guo,Hongyuan Sheng,Shanli Qin,Biwei Wang,Dandan Han,Tongtao Li,Dong Yang,Angang Dong
Three-dimensional (3D) porous graphene frameworks, which combine the advantages of both porous materials and graphene, have recently attracted enormous attention for electrochemical energy storage. Despite the tremendous progress, it remains a grand challenge to synthesize graphene frameworks with ordered porosity and well-defined macroscopic morphologies. Herein, we report the design and synthesis of centimeter-scale, free-standing thin films of ordered mesoporous graphene frameworks (MGFs) from 2D nanocrystal superlattices self-assembled at the solid– or liquid–air interface. The resultant MGF films possess uniform thicknesses tunable in the range from a few hundred nanometers to several tens of micrometers, highly ordered and interconnected mesoporosity, ultrathin pore walls comprising few-layer graphene, and high surface areas. To demonstrate their potential applications in energy storage, MGF films are used as electrode materials to build supercapacitors, which exhibit high specific capacitances with excellent cycling stabilities in both aqueous and organic electrolytes, with the capacitive performance comparable to or higher than that of most graphene-based materials developed previously.
研究领域:
材料科学
·
纳米技术
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 7
·1002-1014
·
IF 4.1
Wang Bo-Wen,Zhang Heng,He Qing-Xia,Yu Hui-Tao,Qin Meng-Meng,Feng Wei
With the rapid development of high-power-density electronic devices, interface thermal resistance has become a critical barrier for effective heat management in high-performance electronic products. Therefore, there is an urgent demand for advanced thermal interface materials (TIMs) with high cross-plane thermal conductivity and excellent compressibility to withstand increasingly complex operating conditions. To achieve this aim, a promising strategy involves vertically arranging highly thermoconductive graphene on polymers. However, with the currently available methods, achieving a balance between low interfacial thermal resistance, bidirectional high thermal conductivity, and large-scale production is challenging. Herein, we prepared a graphene framework with continuous filler structures in in-plane and cross-plane directions by bonding corrugated graphene to planar graphene paper. The interface interaction between the graphene paper framework and polymer matrix was enhanced via surface functionalization to reduce the interface thermal resistance. The resulting three-dimensional thermal framework endows the polymer composite material with a cross-plane thermal conductivity of 14.4 W·m −1 ·K −1 and in-plane thermal conductivity of 130 W·m −1 ·K −1 when the thermal filler loading is 10.1 wt%, with a thermal conductivity enhancement per 1 wt% filler loading of 831%, outperforming various graphene structures as fillers. Given its high thermal conductivity, low contact thermal resistance, and low compressive modulus, the developed highly thermoconductive composite material demonstrates superior performance in TIM testing compared with TFLEX-700, an advanced commercial TIM, effectively solving the interfacial heat transfer issues in electronic systems. This novel filler structure framework also provides a solution for achieving a balance between efficient thermal management and ease of processing.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xinling Yu,Nian Li,Shudong Zhang,Cui Liu,Liqing Chen,Shuai Han,Yanping Song,Mingyong Han,Zhenyang Wang
Constructing 3D graphene frameworks with ultra-thickness and rich ion transport paths is of great significance for the practical application of graphene supercapacitors . Herein, 3D porous graphene frameworks, with thickness up to 320 μm, are directly grown by laser induction on the synthesized polyimide by optimizing the thermal sensitivity of polyimide to increase laser penetration depth. Simultaneously, hierarchical pores are obtained due to fast liberation of gaseous products during laser radiation, which facilitates fast ion transport. Coupled with its conductive interconnection network, the as-prepared 3D graphene delivers a high specific capacitance of 132.2 mF cm −2 at 0.5 mA cm −2 , which is nearly one order of magnitude larger than that of most reported laser induced graphene electrodes. Pseudocapacitive polypyrrole is further introduced into the graphene frameworks to prepare composite electrodes, which show specific capacitances as high as 2412.2 mF cm −2 at 0.5 mA cm −2 . Accordingly, flexible solid-state micro-supercapacitors are constructed, with a high energy density of 134.4 μW h cm −2 at a power density of 325 μW cm −2 . Furthermore, 95.6% of initial capacitance is retained after 10,000 cycles, indicating superior cycling stability. These results suggest that the ultra-thick hierarchical porous graphene frameworks have promising prospects for high-performance flexible micro-supercapacitors.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Yan Zheng,Fei He,Jiaming Wu,Delong Ma,Huailin Fan,Shufei Zhu,Xiang Li,Yizhong Lu,Qing Liu,Xun Hu
Iron (Fe)- and nitrogen (N)-codoped carbon materials hold broad application prospects in the oxygen reduction reaction (ORR) because of their abundant reserves, low cost, and excellent catalytic activity. In this study, a N-doped carbon nanotube (CNT)–graphene framework with encapsulated Fe/Fe3N nanoparticles (Fe–N–CNT@RGO) is designed and synthesized by annealing a mixture of iron acetylacetonate, dicyandiamide, and graphene oxide via a one-step calcination strategy. Fe–N–CNT@RGO has a better ORR catalytic activity than reduced graphene oxide (RGO), N-doped graphene, and N-doped CNTs with encapsulated Fe/Fe3N nanoparticles with respect to the onset potential, limiting current density, and kinetic current density. Fe–N–CNT@RGO also has high stability and a high discharging cell voltage, which approaches those of platinum/carbon in zinc–air batteries. The relationship between the structure and activity of Fe–N–CNT@RGO demonstrates that the high density of Fe–N and pyridinic N sites, moderate wettability, and positive ζ potential promote exposure of the active sites, accelerate the transmission of hydrated oxygen, and enhance the adsorption of HO2– for the 4e– ORR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 47
·24128-24138
·
IF 7.443
Guowei Huang,Hao Liu,Shengping Wang,Xi Yang,Binhong Liu,Hongzheng Chen,Mingsheng Xu
Hierarchical architecture of ultrathin interlayer-expanded WS2 nanosheets supported on three-dimensional graphene (3DG) frameworks is fabricated by a facile hydrothermal method for the first time. The 3DG frameworks could provide large surface area for assembling WS2 nanosheets and continuous pathways for rapid electron transfer and ion transport; and the WS2 nanosheets with an expanded interlayer spacing of 9.58 Å, due to oxygen incorporation, could afford more space for lithium ion intercalation and more active sites for hydrogen evolution. The as-prepared WS2/3DG composite exhibits a high capacity of 766 mA h g−1 and excellent cycling stability for lithium storage, much better than its annealed counterpart and bulk WS2. The hydrated sheet of WS2/3DG also demonstrates boosted electrocatalytic activity for the hydrogen evolution reaction, possessing a low onset overpotential of 75 mV and an extremely large current density of 137 mA cm−2 at 300 mV with remarkable durability. This work may open up a new pathway for improving the electrochemical properties by synergistically optimizing the electrode architectures and the intrinsic electroactivity of the active materials.
研究领域:
材料科学
·
能源存储与转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Yanhong Lu,Zhantong Ye,Yating Zhao,Qing Li,Meiyu He,Congcong Bai,Xiaotong Wang,Yalu Han,Xingchen Wan,Suling Zhang,Yanfeng Ma,Yongsheng Chen
Carbon coating has been an effective procedure to tackle the severe structural degradation and poor conductivity during cycling of silicon-based anodes in lithium-ion batteries (LIBs). However, the traditional coated carbon usually is tight and thus limit the fast-charging rate and high specific capacity. Herein, through in-situ formation of metal-organic frameworks on the surface, silicon particles were firstly coated by an inside carbon layer . Followed by a solvothermal reaction with the mixture of sucrose and graphene oxide , the second carbon layer outside the silicon particles was deposited, and simultaneously a highly conductive graphene network was formed. After a high temperature pyrolysis process , a graphene matrix supported silicon material with inward multi-channel carbon and outward tight activated carbon was prepared. This unique core/double-layer carbon structure, combined with the highly conductive graphene frameworks, render the material to demonstrate excellent electrochemical performance as anode materials for LIBs in terms of both lithium storage capacity and cycling stability. Thus, the electrode materials deliver a high specific capacity of 1528.1 mA h g −1 at the current density of 0.1 A g −1 and rate capacity retention of 45.5% at 1 A g −1 to 0.1 A g −1 . Simultaneously, a highly stable reversible capacity of 1182 mAh g −1 with 89.5% retention over 240 cycles at a current density of 0.2 A g −1 and 484 mAh g −1 with 76.8% retention after 450 cycles at 1.0 A g −1 were obtained. This work can offer an alternative approach for high-energy and low-cost silicon-based anodes for LIBs.
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
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 6
·2100055
·
IF 4.367
Yanjuan Liang,Yelong Tong,Zechao Tao,Quangui Guo,Baoyi Hao,Zhanjun Liu
A paraffin-based shape-stabilized composite phase change material (CPCM) is fabricated with dramatically enhanced thermal conductivity and excellent electromagnetic interference (EMI) shielding capacity. The as-prepared CPCMs are supported by graphene-based frameworks with many bubble-like micropores that are prepared by the addition of polystyrene microspheres into graphene oxide hydrogel as hard templates. These bubble-like micropores can encapsulate paraffin wax (PW) due to the strong capillary force between the graphene-based framework and PW and leading to enhanced shape stability of the as-prepared CPCMs. Moreover, the continuous thermally and electrically conductive network formed by graphene nanoplatelets endows the as-prepared CPCMs with a high thermal conductivity and an excellent EMI shielding effectiveness. When the ratio of graphene-based framework is 23.0 wt%, the thermal conductivity and latent heat of CPCM reaches 28.7 W m −1 k −1 and 175.8 J g −1 , respectively, and the EMI shielding effectiveness is higher than 45 dB in the frequency of 8.2–12.4 GHz. Their outstanding thermal and EMI shielding performance makes the as-prepared CPCMs promising candidates for use in thermal management and EMI shielding of electronic devices.
研究领域:
材料科学
·
热管理
·
电磁学
✓ 已验证
DOI
高影响因子
CARBON
·
2013
·
IF 5.868
Yuezeng Su,Yi Zhang,Xiaodong Zhuang,Shuang Li,Dongqing Wu,Fan Zhang,Xinliang Feng
The development of metal-free catalyst for oxygen reduction reaction (ORR) is one of the most challenging tasks in fuel cells. Heteroatom doped graphenes have been recognized as the promising candidate. In this work, we have developed a one-pot hydrothermal approach towards three-dimensional nitrogen and sulfur co-doped graphene frameworks (N/S-GFs) employing graphene oxide and ammonium thiocyanate as the precursors. N/S-GFs manifest excellent catalytic behavior with mainly four electron transfer pathway in ORR in alkaline condition.
研究领域:
材料科学
·
电化学
✓ 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）