INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 11
·8567-8577
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IF 3.741
Ning Xie,Junyi Niu,Xuenong Gao,Yutang Fang,Zhengguo Zhang
Summary Latent heat storage system using phase change materials (PCMs) has been recognized as one of the most useful technologies for energy conservation. In this study, a novel type of fatty acid eutectic of methyl palmitate (MP) and lauric acid (LA)/polyacrylonitrile (PAN) composite phase change fiber is prepared by single electrospinning method. Additionally, copper nanoparticles (CNPs) with different mass ratio are combined for improving the thermal conductivity of the PCM. The structure and morphology of the fabricated composite PCMs are observed by scanning electron microscopy (SEM), and the thermal properties and performance are also characterized. SEM results show that the liquid fatty acid has been fully stabled by the three-dimensional structure of the fibers. Good compatibility among the components of the composites is also demonstrated. Besides, the addition of nanoparticles leads to an improved thermal conductivity by over 115.2% and a phase transition temperature 21.24 °C as well as a high latent heat of 85.07 J/g. Moreover, excellent thermal reliability of the phase change fiber is confirmed by multiple thermal cycles. Hence, the composite PCM prepared in this study shows a promising potential for thermal energy system such as building insulating and thermal mass regulating textiles.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 11
·8442-8454
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IF 3.741
Abdul Haleem,Zeeshan Haider,Rafi u Shan Ahmad,Uzabakiriho Pierre Claver,Afzal Shah,Gang Zhao,Wei-Dong He
Summary There have been tremendous efforts made to investigate various materials to enhance the electrical performance of triboelectric nanogenerators (TENGs) but there is still demand for some techniques to further enhance the performance of tribomaterials. Therefore, we fabricated a bimetallic hybrid cryogel via cheap and facile UV-radiation as well as in situ reduction method. Fabricated TENG device made up of porous hybrid bimetallic cryogel film containing silver and gold nanoparticles as tribopositive material and poly dimethyl siloxane (PDMS) as a tribonegative layer with dimension of 1 × 2 cm 2 has the ability to produced output voltage of 262.14 V with current density of 27.52 mA/m 2 and 7.44 W/m 2 peak power density, which was sufficient to light up more than 120 white light emitting-diodes (LEDs). Porous and rough structure, interaction of nanoparticles was the reason behind the performance enhancement of tribopositive material. Thus, this study introduces a very stable and easily synthesized bimetallic hybrid cryogel as a tribopositive material to enhance the performance of tribomaterials to design high performance TENG devices.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 14
·12169-12179
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IF 3.741
Jianan Li,Xiujuan Lin,Guanliang Chen,Eugenie Uwiragiye,John G. Fisher,Shifeng Huang,Xin Cheng
Summary Dielectric composites are regarded as potential energy storage materials for electric power systems and advanced electronics because of the tunable permittivity, excellent flexibility, and high electric breakdown strengths. However, for the moment, it is still a challenge to fabricate dielectric composites combining large electrical breakdown strength and high discharged energy density. Ferroelectric (K 0.5 Na 0.5 )NbO 3 (KNN) particles are fabricated by solid-state reaction and introduced into poly(vinylidene fluoride) to improve energy storage capability. Particularly, the properties such as dielectric constant ( ε r ), electric displacement, breakdown strength ( E b ) and discharged energy density ( U dis ) are enhanced with the introduction of KNN particles. The composite containing 3 vol% KNN particles exhibits an ultrahigh U dis of 14.70 J·cm −3 at 480 kV·mm −1 , which is approximately three times that of pure PVDF of 4.80 J·cm −3 at the applied electric field of 350 kV·mm −1 . This research is of critical significance for proposing a convenient and effective way to design high discharged energy storage dielectric composites for future flexible portable capacitors. Keywords: dielectric composite, (K 0.5 Na 0.5 )NbO 3 particle, breakdown strength, discharged energy density.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 14
·11564-11582
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IF 3.741
Wei Liu,Hong Yuan
Summary Hydrogen is considered an ideal energy carrier. However, the use of fossil fuels to produce hydrogen depletes natural resources and causes environmental problems. Therefore, there is an urgent need to find alternative raw materials and technologies for the production of hydrogen. Waste cooking oil (WCO) is a renewable energy source that has emerged as a potential raw material for hydrogen production. This study describes the production of hydrogen and carbon nanotubes (CNTs) by catalytic cracking of a WCO model compound (WCOMC) performed in a lab-scale fixed bed using Ni-Co/SBA-15 catalysts. The phase, structure and reduction properties of the catalyst were analysed by using different characterisation methods. The effects of the nickel-cobalt metal content and the reaction temperature on both the hydrogen production and the quality of the CNTs were investigated. The deposited carbonaceous products were characterised to analyse their external appearance, internal structure, oxidation stability and graphitisation degree. The results indicated that the catalyst containing 20% Ni and 30% Co showed the highest activity. When reaction temperature was 800°C, the instantaneous volume fraction of hydrogen was close to 43.5 vol% and the content of hydrogen in the gas product was close to 66.5 vol%. A few multi-walled CNTs having a small diameter and some CNTs with an open-topped structure were deposited on 10%Ni-40%Co/SBA-15 and 30%Ni-20%Co/SBA-15, respectively. Thermogravimetric analysis and Raman spectroscopic analysis indicated that all CNTs showed high oxidation stability and a high degree of graphitisation.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 9
·7580-7590
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IF 3.741
Jiale Mao,Shuang Wang,Lei Zhang,Yu Chen,Yonghong Cheng
Summary Energy storage media is the kernel for the rapidly developing new energy systems, while it remains a challenge to achieve admirable service capability at high temperature. This manuscript purposes crosslinking as an effective method to address the issue. The epoxy is innovatively studied as energy storage media in this research. We figure out that crosslinking density is a critical factor to determine its energy storage performance. With adequate crosslinking, attractive energy storage density/efficiency (6.9 J/cm 3 /90%@room temperature; 1.2 J/cm 3 /90% and 1.7 J/cm 3 /75%@100°C) can be achieved. However, excessive crosslinking density and lack of crosslinking point are found to induce obvious energy storage performance decaying at high electric field and high temperature, respectively. This manuscript demonstrates that the general epoxy materials can be used as energy storage media and concludes that proper crosslinking can improve the energy storage performance of polymers, which provides directions for future research on high-temperature energy storage films.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 9
·7568-7579
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IF 3.741
Hejing Wen,Zhongsheng Liu,Jia Qiao,Ronghua Chen,Ruijie Zhao,Jianchun Wu,Guanjun Qiao,Jianhong Yang
Summary Aluminum-air battery (AAB) is a very promising energy generator for electric vehicles (EVs) due to its high theoretical capacity and energy density, low cost, earth abundance, environmental benignity and rapid refuel. In this study, the practical energy efficiency and power density of AAB are improved by optimizing its factors, such as anode-cathode distance, operation temperature, electrolyte flow rate and the atmosphere. Under air atmosphere, the peak power density reaches 381 mW cm −2 , and the optimum output power density is 258 mW cm −2 with the anode efficiency of 90.9% and energy efficiency of 44.4%; and under pure O 2 atmosphere, the peak power density is up to 545 mW cm −2 , and the optimum output power density is 430.5 mW cm −2 with the anode efficiency of 94.2% and energy efficiency of 42.6%. These results are promising to constitute a foundation for future development of Al-air battery systems for EVs. Highlights There is rare literature on the influence of ACD and electrolyte flow rate on Al-air battery performances. The optimum parameters for Al-air flow battery are operating at 60°C with parameters of ACD of 0.5 mm, electrolyte flow rate of 15 mL min −1 under pure O 2 atmosphere. Pure O 2 atmosphere can help to keep high energy efficiency at high power density for Al-air flow battery due to the increased oxygen solubility, but slightly reduced anode efficiency. Under pure O 2 atmosphere, the peak power density is up to 545 mW cm −2 , the anode efficiency reaches 96.2%. The optimum output of power density is 430.5 mW cm −2 with the energy efficiency of 42.6%.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 44
·期 2
·833-844
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IF 3.343
Xiao Wang,Wei Li,Shu-ao He,Qiong Ma,Bingchang Yan,Nan Meng,Lifen Hao
Summary With the improvement of people's living standard, energy shortage is increasingly severe. Photocatalysis technology is one of the most effective means to solve this problem. Generally, poor visible-light response and fast combination of photo-induced carriers are the main limiting factors to traditional photocatalysts. Aiming at this problem, in this paper, AgBr was used as the photosensitizer to immobilize on the surface of reduced graphene oxide (rGO) for the complexation of Ag + ions and carboxyl groups of precursor graphene oxide (GO), then the two-dimensional rGO-AgBr/Ag composites (2D rGAA-α, α = 1, 2 and 3) were synthesized by solvothermal method. The structures, morphologies, chemical bonding states and photoelectrochemical properties of the samples were analyzed to study the samples, and the corresponding visible-light-driven (VLD) catalytic performances were studied by hydrogen evolution reaction (HER). Compared with pure rGO, the light absorption of rGAA-α was almost extended to full spectral range for the Z-scheme heterointerface (rGO-AgBr) construction, and the separation of photo-induced carriers can be promoted effectively. The HER results showed that the average hydrogen evolution rate ( ) of rGAA-α was significantly increased, and the rGAA-2 catalyst presented the highest (72.71 μmol h -1 g -1 ). After six recycling experiments, the very faint activity decrease and unobvious structure change suggested the high photostability. Accordingly, the enhanced catalytic activity of rGAA-α catalysts was attributed to the formation of Z-scheme heterointerface and generation of Ag plasmas, so this study will provide a simple, effective and promising method for hydrogen energy development.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 44
·期 2
·977-987
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IF 3.343
Chuan Ding,Weilong Xu,Min Wang,Xueqin Zeng,Wei Wang
Summary ZnCo 2 O 4 /C microhydrangeas with controllable microstructure are successfully synthesized through a simple citrate-guided solvothermal method and following thermal decomposition. The experimental results reveal that the citrate-directed self-regulation of Zn-Co-EG agglomerates play a critical role in the formation of the hydrangea-like precursors. When applied as anode material in lithium ion batteries (LIBs), ZnCo 2 O 4 /C microhydrangeas exhibited high available capacities of 964.6 mAh g −1 at 1 A g −1 after 200 cycles and 704.4 mAh g −1 at 4 A g −1 over 1000 cycles. The excellent reliability is attributed to the superior microstructure that provides many benefits including enhanced electron or ion transport and improved structure stability, etc.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 43
·期 13
·7095-7106
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IF 3.343
Fen Zhou,Liuli Zeng,Wei Guo,Yizhi Yan,Fan Wu,Mu Pan
Summary A series of different α-Fe 2 O 3 nanoparticles composites containing different amounts of graphene coatings have been successfully prepared using a simple electrostatic self-assembly (ESA) method. The structure and electrochemical properties of these α-Fe 2 O 3 @graphene composites have been investigated. The α-Fe 2 O 3 nanoparticles composite containing 40 wt% graphene coating exhibits the highest specific capacity (385 mAh g −1 ) under 1000 mA g −1 , resulting in superior cycle stability with no downward trend after 500 cycles. These results demonstrate that graphene coatings can be used to enhance the electrochemical properties and morphological stability of α-Fe 2 O 3 nanoparticles as anodic materials for high performance lithium-ion batteries (LIBs). The low-energy self-assembly method employed in the paper has good potential for the broad-scale preparation of other graphene-modified materials because of its simplicity and the relatively low temperature conditions.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 43
·期 13
·6970-6982
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IF 3.343
Yong Jiao,Chongyang Wang,Liqin Zhang,Wenting An,Na Zhou,Guangming Yang,Wei Wang,Wei Zhou,Si-Dian Li
Summary Solid oxide fuel cells (SOFCs) can directly utilize solid carbon as fuel by integrating with the reverse Boudouard reaction in the anode chamber. Efficiency of the Boudouard gasification of solid carbon fuel is one of the crucial factors influencing the performance of direct carbon SOFCs (DC-SOFCs). In this paper, a novel Boudouard reaction catalyst derived from steel slag was first introduced into DC-SOFCs for improving the electrochemical performance. The catalytic activity of the steel slag was activated using the molten alkali method to decompose the inert mineral phases of the raw material. The steel slag–derived catalyst was loaded on the activated charcoal by a wet ball milling method. This kind of catalyst can match up to the readily available solid carbon fuels in cost. Promoted by this highly active Boudouard reaction catalyst, the initial Boudouard gasification temperature of the carbon fuel decreased by 99°C, and the producing rate of carbon monoxide doubled. Furthermore, the power outputs of the fuel cells increased from 91 to 159 mW cm −2 , and the fuel utilization increased from 17.10% to 46.43% at 825°C. This study demonstrates that the steel slag–derived catalyst is a promising material for the performance improvement of DC-SOFCs and may make a valuable contribution to their commercial application.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 13
·7058-7074
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IF 3.343
Zhiwei Yang,Zijuan Yang,Jinhong Li,Yong Deng,Lijie Liu,Xuezhu Luan,Kaiyue Huang
Summary In this work, diatomite (DM) was calcined at 400°C to obtain the pure surface and pores (DM-1); then, the three kinds of shape-stable composite phase change materials (ss-CPCMs) of CaCl 2 ·6H 2 O (CCH)/DM-1, CH 3 COONa·3H 2 O (SAT)/DM-1, and Na 2 SO 4 ·10H 2 O (SSD)/DM-1 were prepared by impregnation method. The hydrated salts were uniformly adsorbed on the surfaces and into the pores of DM-1 by capillary action and surface tension. The addition of nucleating agent effectively reduced the supercooling degrees of hydrated salts, and the heterogeneous nucleation mechanism was employed to explain the supercooling suppression. The results showed that the supercooling degrees of the three hydrated salt ss-CPCMs with optimal nucleating agent were less than or equal to 0.6°C. Moreover, the thermal conductivities of ss-CPCMs were significantly improved by adding graphite, and the addition of 10 wt% graphite could increase the thermal conductivity of hydrated salt ss-CPCMs by at least 70%. The package capacity of CCH, SAT, and SSD in three ss-CPCMs with appropriate contents of nucleating agent and graphite was 58.1, 56.1, and 56.3 wt%, respectively. The DSC results showed that the phase change temperatures of the three ss-CPCMs were approximately 28.8 to 57.8°C, and the latent heat was approximately 108.7 to 149.4 J/g. The XRD and FT-IR results exhibited that the three ss-CPCMs indicated understanding chemical compatibility. In addition, the results of 200 melt-solidification cycles demonstrated that the ss-CPCMs had excellent thermal cycle reliability. Thus, the hydrated salt/DM-1 ss-CPCMs showed great potential as heat storage materials for various heat storage applications.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 13
·7529-7540
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IF 3.343
Fei Xie,Mingchen Zhou,Guoyu Wang,Qiyang Wang,Manqing Yan,Hong Bi
Summary In this work, the binary N-CDs@PANI hybrids were fabricated by introducing zero-dimensional nitrogen-doped carbon dots (N-CDs) into reticulated PANI. Firstly, N-CDs were prepared by one-pot microwave method, and then, the N-CDs were introduced into in situ oxidative polymerization of aniline (ANI) monomer. The N-CDs with abundant functional groups and high electronic cloud density played a significant role in guiding the polyaniline-ordered growth into intriguing morphologies. Moreover, morphology-dependent electrochemical performances of N-CDs@PANI hybrids were investigated and N-CDs improve static interaction and enhance the special capacitances in the N-CDs@PANI hybrids. Especially, the specific capacitance of PC4 hybrid can reach 785 F g −1 , which exceed that of pure PANI (274 F g −1 ) at current density of 0.5 A g −1 according to three-electrode measurement. And the capacitance retention of the PC4 hybrid still keeps 70% after 2000 cycles of charge and discharge. The N-CDs@PANI hybrids can have potential applications in electrode materials, supercapacitors, nonlinear optics, and microwave absorption.
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高影响因子
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