FUEL PROCESSING TECHNOLOGY
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2023
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IF 7.5
Yanwei Liu,Hongbiao Du,Yanghao Meng,Shuai Lu,Jinglai Zhang,Huansheng Wang
In this study, a reduced graphene oxide (RGO) material loaded with nickel was prepared, and to the best of the authors' knowledge, it was the first time that RGO material used as a catalyst in the hydrothermal liquefaction (HTL) of microalgae. The effect of RGO support Ni catalyst on the yield and quality of bio-oil derived from HTL of Spirulina was studied in this research. The results showed that the catalyst could improve the yield of bio-oil, and the performance in improving the quality of bio-oil was significantly increased. GC–MS analysis showed that RGO catalyst could promote the formation of hydrocarbons. When the loading amount of Ni was 5%, the oxygen content of bio-oil was the lowest (14.79%), and when the loading amount of Ni was increased to 25%, the content of hydrocarbons was the highest (11.41%). In addition, RGO catalyst also increased the content of low boiling point components (<400°C) in bio-oil from 68% to 81%. This study can provide valuable information for the further application of graphene in microalgae HTL and the production of high-quality bio-oil in the future.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ruixue Li,Xiaoping Shen,Zhenyuan Ji,Yinxiu Xue,Peng Song,Hu Zhou,Lirong Kong,Shiping Zeng,Caixia Chen
Zinc-ion hybrid supercapacitors (ZHSs) with a fiber-shaped form are strongly desired for flexible electronics, but the construction still remains a great challenge. Herein, by using a graphene/multi-walled carbon nanotubes (MWCNTs) hybrid tube (GMHT) as cathode and a 2D nanostructured Zn modified graphene/MWCNTs tube (Zn@GMHT) as anode, we, for the first time, fabricate a ‘sword-scabbard’ like coaxial fiber-shaped all-solid-state ZHSs. The core-sheath structure notably accelerates electron transport and ion diffusion, and in comparison with the commonly used Zn metal electrode, an astounding 84.1 % anode mass reduction has been realized. Specifically, the optimized GMHT//Zn@GMHT ZHSs presents a superb length specific capacitance of 470.6 mF cm −1 (relevant to an outstanding areal/volumetric capacitance of 735.3 mF cm −2 /19.6 F cm −3 ) at the current density of 1 mA cm −1 , which is obviously better than most of the reported fiber-shaped ZHSs. Meanwhile, the device shows a maximum energy density of 167.3 μWh cm −1 at the power density of 533.5 μW cm −1 , and an attractive power density of 5988.1 μW cm −1 at 16.8 μWh cm −1 . Moreover, the capacitance retentions of 84.6 % after 5000 charge–discharge cycles and 100–88.3 % under bending angles from 0 to 150° demonstrate great electrochemical stability and mechanical flexibility of the device. The admirable properties, together with this creative architecture and ultralight function, endow GMHT//Zn@GMHT with a broad prospect in wearable application.
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Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 6
·2793-2803
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IF 14.511
Yiwang Ding,Chang Yu,Jiangwei Chang,Xuedan Song,Jinhe Yu,Siyi Hou,Yuanyang Xie,Jieshan Qiu
The intrinsic nature of micro/nano-structured carbon materials is fundamentally relevant to the states of surface charge distribution at the nano-scale level, and the corresponding relationship urgently needs to be modulated and probed. Herein, we modulate the in-plane local charge density on reduced graphene oxide (rGO) by a carbon quantum dot (CQD)-mediated interface-chemistry strategy, realizing charge enrichment over the surface of rGO, which is firstly probed and synchronously visualized with nano-scale topography measurements by electronic mapping. The short-range-ordered CQDs that possess a higher surface potential than the long-range-ordered rGO can act as a charge modulator for efficient and intrinsic electron injection from CQDs to rGO. As a proof-of-concept, the CQDs with a tunable loading are integrated into the surface of rGO by gradient centrifugation. Compared with the basal-plane sites (about 0 nA), the edge sites of rGO and the attached CQDs manifest a strong response of TUNA current, where the responsive current is positively correlated with the density of edge-plane sites and can be modulated up to 160 nA, visualized using PeakForce TUNA. The characteristics of local charge enrichment are also conducive to improving the intrinsic electrocatalytic properties of rGO with π electron delocalization, proved by using the obtained CQD-coupled rGO materials as an effective electrocatalyst comparable to Pt for the triiodide reduction. This work builds an efficient method for modulating and probing the micro-electron characteristics of advanced carbon materials, further achieving an intuitive and visualized verification regarding the relationship between edge-plane sites and the in-plane surface charge density of the carbon substrate.
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CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Baoyun Ye,Hongyi Chen,Binhao Shen,Chang Liu,Chongwei An,Jingyu Wang,Yong Zhang
In this work, a novel CuO-based nanocomposite was successfully prepared by hydrothermal method . The results of FT-IR, XRD , XPS and SEM indicated that the nano CuO was successfully loaded on GO/MoS 2 sheets. The catalytic ability of the CuO-based composite was researched by the AP thermal decomposition behavior and the combustion behavior of AP/HTPB. The CuO-based composite could significantly enhance the AP thermal decomposition performance through decreasing the activation energy of AP during the thermal decomposition process. Especially for CuO(90)@MG(10), the AP thermal decomposition temperature was reduced from 437.5 to 334.9 °C and the heat release increased from 396.7 to 1576.8 J/g by adding 4% of the CuO-based nanocomposite. After adding the CuO-based nanocomposite, the ignition delay time of AP/HTPB solid propellant decreased obviously from 0.346 s to 0.109 s with a higher flame height and a stronger flame brightness during the combustion process, indicating that the CuO-based nanocomposite could effectively promote the combustion behavior of AP/HTPB composite solid propellant. In summary, the CuO-based nanocomposite could be applied as an excellent catalyst for improving AP thermal decomposition and a combustion catalyst for AP-based composite solid propellants.
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Materials Today Communications
·
2022
·
IF 3.662
Miao He,Dengdeng Xie,Lian Yin,Kaili Gong,Keqing Zhou
It is well known that poor thermal conductivity , easy leakage in melting, and low fire safety will hinder the practical application of phase change materials (PCMs) in energy storage. In this work, a series of graphene aerogels with different reduction degrees were obtained by regulating the reaction temperature and then compounded with paraffin wax to form composite PCMs. Satisfactorily, the composite PCMs not only showed a considerably improved shape stability compared to pure paraffin wax, but also an improvement in thermal conductivity from 13.56% to 44.44% with the increase of reduction temperature. Besides, the composite PCMs exhibited promising thermal stability and flame resistance. The peak heat release rate of the composite PCMs decreased by 27.5%, 32.1% and 41.3% respectively as the reduction temperature increased. More importantly, the composite PCMs had outstanding photothermal conversion capability, and the temperature of the composite phase change material could rise from 20 ℃ to 63 ℃ after absorbing light for 4 min. Overall, the increase of the reduction temperature of graphene aerogel has an outstanding contribution to improving the energy storage performance and thermal properties of the composite PCMs.
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高影响因子
IONICS
·
2022
·Vol. 29
·期 3
·917-930
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IF 2.961
Zhong Weixu,Hong Jiabin,Wang Chunxiang,Li Zhifeng,Chen Jun,Dmytro Sydorov
Nano-MoS 2 and MoS 2 /graphene nanocomposites are prepared by a simple xylitol auxiliary ball milling method. Xylitol can increase the shear force in the ball milling process and overcome the interlayer van der Waals force between MoS 2 and the graphite layer, thus improving the efficiency of preparing nanomaterials by ball milling method. As a result, the MoS 2 /graphene hybrid nanosheets exhibit higher discharge capacity and better cycle stability as lithium-ion anode materials. When the original addition amount of MoS 2 and graphite is 1:1, the materials have the best electrochemical behaviors. The initial discharge capacity is as high as 1014 mAh·g −1 at a current density of 50 mA·g −1 , after 300 cycles at a current density of 250 mA·g −1 , the capacity remains at 664 mAh·g −1 without decay. Therefore, the xylitol auxiliary ball milling method is suitable for the scalable preparation of new transition metal sulfide (TMDS)-based anodes for lithium-ion batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Weiye Chen,Lei Chen,Liangyu Li,Chuanshuai Dong,Lizhi Zhang
Phase change energy storage technology has broad applications in many engineering fields, such as building energy conservation, aerospace, and thermal management of electric equipment. However, the inorganic phase change materials suffer a lot from supercooling, phase separation, and low thermal conductivity. Therefore, this paper aims at developing a novel electrically-triggered phase change composite by making use of its supercooling characteristics, achieving a controllable release of latent heat as it is wanted. Polished by radial and axial grinding respectively, both surface-triggered electrodes (STE) with a uniform rough structure and point-triggered electrodes (PTE) with the gradient rough structure were prepared to investigate the effect of surface structure on the electrical crystallization. The 100-cycle test results indicated the newly-prepared electrode achieved a stable electrically-triggering ability. The oxidation rate of electrodes was significantly affected by interface characteristics of the gas–liquid-solid interfaces. What’s more, the effect of voltage and supercooling degree on the crystallization behaviours, like induction time, morphology, and growth of the dendrite, and heat transfer process, were comprehensively investigated. With the increase of the supercooling degree, the dendrite shape gradually changed from acicular crystal to flocculent crystal, and the induction time decreased rapidly. To improve the thermal conductivity, a novel phase change composite using sodium acetate trihydrate/carboxymethyl cellulose/expanded graphite (SAT/CMC/EG) was developed. Considering both thermal conductivity and electrical nucleation, the optimized mass ratio of SAT: CMC: EG was 100:1:8. These research findings would provide valuable guidance in the intelligently-controllable energy storage technology.
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PROGRESS IN NUCLEAR ENERGY
·
2022
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IF 2.461
Changlong Bi,Jinru Nian,Chunhong Zhang,Lijia Liu,Lien Zhu,Ruiqi Zhu,Qi Qi,Fuqiu Ma,Hongxing Dong,Chao Wang
In this study, a novel amidoxime functionalized graphene oxide adsorbent (GO-D-AO), based on the reaction of dopamine modified graphene oxide with acrylamide diacetonitrile and on the reaction of amidoximation, was successfully designed and prepared to effectively adsorb U(VI) ions. GO-D-AO was characterized by SEM , FT-IR, XRD and XPS techniques, and then applied as the adsorbent for the U(VI) adsorption. The GO-D-AO contained more amidoximation groups after the amidoximation modification due to the use of acrylamide diacetonitrile modifier. A series of adsorption experiments were carried out to investigate the influence factors in the adsorption process , including the pH values, contact time, temperature and initial concentration of U(VI) solution. The U(VI) maximum adsorption capacity of GO-D-AO was 1823.6 mg·g -1 , which was significantly higher than that of GO because of the excellent chelating ability of amidoxime group with U(VI) ions. And the U(VI) adsorption process of GO-D-AO fitted well with the Langmuir model and the pseudo-second-order kinetic model , indicating the adsorption process was monolayer and chemical adsorption .
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CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 22
·e202203546
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IF 4.3
Zhaohui Yang,Meilin Guo,Pengyu Meng,Min Jiang,Xiangyun Qiu,Jiao Zhang,Chaopeng Fu
Graphical The suitability of aqueous binders for aluminum ion batteries (AIBs), especially the compatibility with ionic liquids and the distribution on the cathode surface, is systematically investigated. Typically, AIBs with sodium alginate (Na−Alg) as binder exhibit outstanding electrochemical performance in terms of specific capacity, rate capability, and cycling stability. The incompatibility of poly(vinylidene difluoride) (PVDF) with acidic ionic liquid electrolytes and the use of toxic and high-cost N-methyl pyrrolidone (NMP) solvents hinder the wide application of aluminum-ion batteries (AIBs). In this work, sodium alginate (Na−Alg) is developed as an aqueous binder for the fabrication of graphite positive electrodes in AIBs. The compatibility of various binders with the ionic liquid electrolyte is evaluated, and interaction between various binders and graphite particles before and after cycling is compared and discussed. The results demonstrate that the well compatibility of Na−Alg in ionic liquids and its reasonable distribution on the graphite surface facilitate fast charge transfer and ion diffusion, reduce electrode polarization, and thus contributing to significantly improved cycling stability and rate capability of AIBs. This work provides a new insight into the development of low-cost, eco-friendly, and high-performance binders for AIBs.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Lina Kong,Liyin Hou,Meichen Liu,Wen Chen,Xueyan Xu,Xufeng Zhou,Zhaoping Liu,Guangjie Shao
The energy density of present Li-ion capacitors (LICs) is severely limited by the carbon-based cathode with supercapacitor properties. Herein, to address the low specific capacitance of the cathode, we prepared a structurally stable carbon composite consisting of polypyrrole-derived highly defective carbon nanotubes and highly conductive reduced graphene oxide (rGO) nanosheets, using a facile one-step hydrothermal self-assembly method. The highly defective structures serve as effective electrochemically active sites to enhance ion adsorption for high-performance capacitance characteristics. Meanwhile, the interconnected porous three-dimensional network structures constructed by one-dimensional carbon nanotubes and two-dimensional rGO nanosheets act as rapid electrons/ions dual transport channels, which synergistically promotes fast energy storage/release with abundant defect structures in the material. The carbon composite with optimized structure exhibits significantly improved specific capacitance of 160.6 F g −1 at 0.3 A g −1 and 91.0 F g −1 at a high current density of 60 A g −1 as a cathode material in half-cells pairing with lithium metal. Furthermore, the carbon composite was employed as a cathode paired with a carbon-coated FeO x (FeO x @N-3DG) anode for LIC applications, which demonstrates a superior energy density of 129.1 Wh kg −1 at a power density of 1.7 kW kg −1 and still maintains an outstanding energy density of 32.9 Wh kg −1 at an extremely high power density of 43.9 kW kg −1 . The findings of this work provide an effective and rational strategy for designing high energy density LICs cathode materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qu Zhang,Chao Xue,Gary Owens,Zuliang Chen
Biodegradation using free cells is limited to low cell density, biological activity, and subsequent cell collection and regeneration are difficult. Meanwhile the limitations of using graphene-based nanomaterials for the removing emerging contaminants are adsorption and required further regeneration. To address these problems, reduced graphene oxide (rGO) synthesized by green tea extract as the carrier served to immobilize Ochrobactrum sp. FJ1 to form a functional bionanomaterial (FJ1@rGO). Its function was to degrade 17beta-estradiol (E2). To obtain a highly functional bionanomaterial, response surface methodology (RSM) with central composite design (CCD) was deployed to evaluate the synthesis conditions, which guided the ability of FJ1@rGO to remove pollutants. Results show that inoculation amount and immobilization time greatly affect removal efficiency, and the efficiency in removing E2 utilizing the optimized FJ1@rGO reached 93.7 % within 10 days. This proved to be significantly higher than prior to optimization. To provide evidence for functional FJ1@rGO, a series of advanced characterization results confirmed that FJ1 was successfully immobilized on rGO. It appears that FJ1@rGO has: firstly, excellent removal effect on E1, BPA, and triclosan; and secondly, excellent recycling properties.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Yi Yang,Cheng-Long Luo,Xu-Dong Chen,Ming Wang
Herein, a sustainable graphene/nanocellulose electromagnetic shielding composite film was fabricated via nanocellulose inducing graphite in-situ mechanical exfoliation. Cations were added to enhance properties of the films via cation crosslinking. The few-layer graphene produced by this strategy was ∼3.4 nm in average thickness and good dispersion in the films. The electrical conductivity , electromagnetic shielding effectiveness and mechanical property of the film were enhanced by cation crosslinking, while cation-π interactions between metal and graphene-enhanced the electrical conductivity and electromagnetic shielding effectiveness. For example, the films cross-linked Cu 2+ cations exhibit a tensile strength of 64.3 MPa, elongation at broken of 17.1%, and electromagnetic shielding effectiveness of 30.7 dB and a conductivity of 3172 S/m at a thickness of 40 μm. In addition, the different Joule heating performance and electromagnetic shielding effectiveness were found in the films by cross-linking with different cations. We provide a new route to prepare low-cost, sustainable, and tunable electromagnetic shielding films with good Joule heating and mechanical property.
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