JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2017
·
IF 3.471
Leilei Dai,Liangliang Fan,Dengle Duan,Roger Ruan,Yunpu Wang,Yuhuan Liu,Yue Zhou,Zhenting Yu,Yuezhen Liu,Lin Jiang
Fast microwave-assisted catalytic pyrolysis (fMACP) of soapstock for hydrocarbon-rich bio-oil using different catalysts was investigated in this study. Effects of catalyst, pyrolysis temperature and catalyst to feed ratio on product fractional yields and chemical composition were studied. Experimental results indicated that the use of catalyst increased the relative content of hydrocarbons and selectivity of aromatics. Moreover, HZSM-5 catalyst enhanced the bio-oil yield. When HZSM-5 zeolite was used as a catalyst, 600 °C was the optimal pyrolysis temperature, which provides the maximum bio-oil yield and high content of hydrocarbons. At the cost of the decrease of bio-oil yield, the increase of catalyst to feed ratio increased the relative content of hydrocarbons from 65.41% to 88.59% and selectivity of aromatics from 5.99% to 29.46%. In addition, the analytical results of bio-char show that bio-char with micropore structure and high contents of the essential plant nutrients and micronutrients can be used as a soil amendment to improve soil productivity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Runze Wang,Tengpeng Wang,Fangsheng Liu,Yuyao Ma,Tao Wei,Dehua Dong
Carbon-assisted solid oxide electrolysis cell (CA-SOEC) presents a promising solution for water electrolysis with reduced energy consumption and enhanced efficiency of hydrogen production. However, one key issue in optimizing CA-SOEC performance is the inefficient mass transfer at the anode layer, particularly in improving the CO–CO 2 shuttle mechanism. To address this issue, this study designs a dendritic channel anode for CA-SOEC, which significantly enhances the CO–CO 2 shuttle, realizing improved mass transfer and reduced polarization resistance. Further, an additional Pd/GDC-Ni nano-catalyst layer was incorporated at the electrode-electrolyte interface, which greatly improved the efficiency and stability of anode layer for long-term electrolysis process, presenting a current density of 1.41 A cm −2 under a low voltage of 1.0 V. This research will help to provide new ideas and technical support for the design of highly efficient and environmentally friendly anode layer of CA-SOEC for water electrolysis.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 1
·e70063
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IF 3.4
Yawen Li,Guoyang Ma,Shaohong Xu,Zaheer Ahmad,Muhammad Ali,Saad Ahmed,Naveed Ahmed
In the present study, hexagonal boron nitride (h-BN) nanosheets were first functionalized with hydroxyl groups (h-BN-OH), and then phosphonic acid groups were grafted onto the h-BN surface (BNP) using aminotris(methylenephosphonic acid) (ATMP) through a condensation reaction. The BNP was then incorporated into a polyvinyl chloride (PVC) matrix to prepare PVC/BNP composites. Thermogravimetric analysis showed an increase in thermal stability, with BNP/PVC composites exhibiting greater resistance to degradation at elevated temperatures. The addition of BNP improved the dispersion and interfacial adhesion within the PVC matrix, as confirmed by Scanning Electron Microscopy (SEM). Furthermore, the PVC/BNP composites exhibited a 22.5% increase in tensile strength (21.2 MPa) and an 82% improvement in elongation at break (464%) compared to pristine PVC composites, which showed a tensile strength of 17.3 MPa and an elongation at break of 255%. Moreover, the addition of BNP notably improved the thermal conductivity from 0.18 to 1.50 W/m K as the BNP content increased from BNP-0 to BNP-4. These improvements in thermal stability and mechanical strength, as well as excellent migration resistance, make BNP/PVC composites highly promising for advanced applications.
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Surfaces and Interfaces
·
2025
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IF 6.3
Chunlin Wen,Zhenhua Tang,Tingsu Liu,Fan Qiu,Yan-Ping Jiang,Xin-Gui Tang,Yi-Chun Zhou,Xiangjun Xing,Ju Gao
Recently, Ga 2 O 3 -based devices with a wide bandgap have gained great attention in power semiconductor devices. However, Ga 2 O 3 -based devices with the substable crystalline phase and high performances need be further developed and discussed. In this work, the α-Ga 2 O 3 thin films and GQDs/α-Ga 2 O 3 heterojunctions were prepared by magnetron sputtering on the transparent FTO substrates with a buffer TiO 2 layer. And, the good self-powered deep-ultraviolet photodetection performance and mechanisms were discussed in the GQDs/α-Ga 2 O 3 /α-TiO 2 /FTO devices: its responsivity to 254 nm UV light can reach 1.72 mA/W at a bias voltage of 0 V, a normalized detection rate of 1.7 × 10 10 Jones and the light-to-dark current ratio (PDCR) of ∼1 were achieved due to the change of heterojunction energy band type from II to I. Moreover, the good self-powered deep UV photodetection for GQDs/α-Ga 2 O 3 /α-TiO 2 /FTO devices were demonstrated: a PDCR of 1.1 × 10 3 , a self-powered responsivity (R) improved by a factor of 5 to 8.7 mA/W, the rise time (τ r )/fall time (τ f ) of 86/39 ms, and a normalized detectivity (D*) with an improved magnitude of 1.3 to 2.3 × 10 11 Jones were achieved by constructing GQDs/α-Ga 2 O 3 heterojunctions on the outer surface of α-Ga 2 O 3 thin film. These results can provide a reference for the future development of Ga 2 O 3 thin film devices.
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OPTICS EXPRESS
·
2025
·Vol. 33
·期 6
·13895-13906
·
IF 3.3
Xiaoxiao Chen,Xueguang Lu,Lu Tang,Kefan Chen,Wanxia Huang
Despite striking advances in terahertz (THz) sources and detectors, the exploitation of active materials that can alter their properties in response to external excitations for the manipulation of THz waves is another major issue. Here, freestanding and easily scalable composite film based on vanadium dioxide/carboxymethyl cellulose (VO2/CMC) is proposed to realize thermally and optically tunable THz waves. This VO2/CMC composite film exhibits broadband modulation with a modulation depth of up to 76%, a response time of about 1.2 s and high stability both in mechanical deformation and in air. Based on the above VO2/CMC composite film, a THz metamaterial with absorption-reflection switchability is demonstrated. By controlling the temperature-dependent phase transition of VO2 particles, the reflection dip of the metamaterial at 0.423 THz with an amplitude of -25 dB first shifts to lower frequencies accompanied by an increase in amplitude, and finally disappears with the THz metamaterial reflecting THz waves almost completely. The experimental results agree well with numerical simulations and the modulation mechanism of the metamaterial is also investigated. This work provides a simple and low-cost method for developing VO2-based THz multifunctional smart devices with promising applications in areas such as but not limited to THz modulators and sensors.
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JOURNAL OF NUCLEAR MATERIALS
·
2024
·
IF 2.8
Jiaqi Li,N. Daghbouj,Xiaoxun He,Ke Chen,Xingzhong Cao,Shuoxue Jin,Jun Li,Haiyuan Wei,Junjun Zhou,Tongmin Zhang,Shuai Xu,Fangfang Ge,J. Duchoň,A.T. AlMotasem,T. Polcar,Bingsheng Li
Layered carbides and borides, blending ceramic and metallic characteristics, present compelling prospects for future nuclear reactor applications due to their complex nanolaminate crystal structure. To explore the behavior of Fe 2 AlB 2 under different conditions, helium irradiation is conducted across saturation fluences and under different annealing and irradiation temperatures. Room temperature (RT) irradiation causes some changes: a-lattice expands 0.3 %, c-lattice contracts 0.07 %, and an embedded amorphous layer into the matrix is formed. 400 °C annealing keeps an amorphous structure whereas 800 °C annealing fully recrystallizes with bubble growth. Increasing the irradiation temperature to 400 °C with the same fluence, smaller bubbles form without an amorphous layer, indicating defect recombination depends on helium attachment to vacancies. Under irradiation at 700 °C, faceted bubbles develop exclusively within Fe 2 AlB 2 , with no such bubbles in Al 2 O 3 . These faceted bubbles align themselves along (110) planes. Simultaneously, irradiation prompts tangled dislocations within the damaged layer, fostering the congregation of polygonal bubbles along grain boundaries (GBs) and creating denuded areas at GBs. Fe 2 AlB 2 demonstrates remarkable oxidation resistance under high-temperature irradiation, maintaining surface stability without the cracks seen in ion-irradiated Ti 3 SiC 2 and Ti 2 AlC at RT. Fe 2 AlB 2 shows promise for use in reactors operating at temperatures above 500 °C due to its resilience to irradiation. Further investigation is warranted for its application in reactors operating in environments exceeding this threshold temperature.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuyin Dai,Qiuyu Lin,Qi Wang,Hongguang Zhao,Yinghua Li
Copper oxides (CuO), by virtue of their exceptional electrical conductivity, benign environmental profile, and economic viability, have emerged as indispensable constituents in the design and development of binder-free electrodes for advanced supercapacitor systems. The ongoing quest for the synthesis of CuO nanomaterials through gentle yet economically feasible methodologies held considerable promise for broadening their applicability within the domain of energy storage devices. In this investigation, a novel architectural innovation was achieved through the integration of carbon nanotubes (CNTs) within the framework of an in-situ electrooxidation process, culminating in the formation of a distinctive CuO-CNT nanorod configuration. Subsequent to this fabrication, the electrode material was subjected to an extensive cyclic voltammetry (CV) activation for 2000 cycles, which precipitated a profound morphological evolution. This process resulted in the emergence of 2D hierarchical nanosheet arrays enveloping 1D nanorods, a configuration herein designated as CuO-CNT-2000. This meticulously engineered lamellar structure conferred upon the material an extraordinary specific surface area, quantified at 219.6 m 2 g⁻ 1 , and an impressive specific capacitance of 709.1 F g⁻ 1 . Moreover, the asymmetric supercapacitor (ASC) assembled utilizing this advanced material exhibited a remarkable energy density, measured at 38.09 Wh kg⁻ 1 . Notably, even after enduring 60,000 charge-discharge cycles, the device demonstrated a retention of 82.36 % of its initial energy density, coupled with a Coulombic efficiency of 99.43 %, thus attesting to its superior electrochemical stability and longevity. The efficacy of the CV activation technique in facilitating significant morphological refinement, augmenting the specific surface area, and enhancing the electrochemical performance of the material suggests a broad applicability of this method to a diverse array of other electrode materials, potentially revolutionizing the design and fabrication of next-generation energy storage systems.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruoyu Chen,Hongbin An,Jie Zhan,Saisai Li,Aiqin Mao,Haiming Wen
A high entropy carbide (TaNbTiV)C was fabricated via spark plasma sintering of high entropy powders that were prepared using a molten salt method. The as-fabricated high entropy carbide was then investigated for its high-temperature oxidation behavior at 850 °C, under atmospheres with three different oxygen contents (20 vol%, 40 vol%, and 60 vol%). After the high-temperature oxidation process, the main phases observed in all the specimens were incompletely oxidized phase (Nb x Ti 1-x )C y O 2-y and oxides (Nb 0.5 Ta 0.5 ) 2 O 5 , TiO 2 , and Nb 2 O 5 . Importantly, the thickness of the oxide layer initially increased and then decreased as the oxygen content increased. When the oxygen content reached 40 vol%, the ceramic displayed severe oxidation behavior with observed thicker of the oxide layer, as well as numerous pores and cracks in the oxide layer. This work provides new insights into the oxidation behavior of high entropy carbides.
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Polymers
·
2024
·Vol. 16
·期 23
·3254
·
IF 4.7
Jiaqi Wang,Zhaoyutian Chu,Sijia Zheng
Considering the demand for the construction of a sustainable future, it is essential to endow the conventional thermoset silicone adhesive with reuse capability and recyclability. Although various research attempts have been made by incorporating reversible linkages, developing sustainable silicone adhesives by natural linkers is still challenging, as the interface between the natural linker and the silicone is historically difficult. We exploited the possibility of utilizingα-lipoic acid, a natural linker, to construct a sustainable silicone adhesive. Via the simultaneous ring-opening reaction between the COOH and epoxide-functionalized silicone and the polymerization of theα-lipoic acid, the resulting network exhibited dynamic properties. The shear strength of the LASA90 presented strong adhesion (up to 88 kPa) on various substrates including steel, aluminum, PET, and PTFE. Meanwhile, reversible adhesion was shown multiple times under mild heating conditions (80 °C). The rheology, TG-DTA, DSC, and1H NMR showed that the degradation of the LASA occurred at 150 °C via the retro-ROP of the five-membered disulfide ring, indicating their recyclability after usage. Conclusively, we envision that a silicone adhesive based onα-lipoic acid as a natural linker is more sustainable than conventional silicone thermosets because of its desired properties, strong adhesion, reversibility, and on-demand heat degradation.
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TALANTA
·
2025
·
IF 6.1
Ruifang Liu,Zhenting Wu,Qiang Li,Sara Shamim,Long Ba
With the advancement of flexible electronics, the demand for low-cost, high-performance flexible humidity sensors for wearable devices has increased significantly. However, commercial humidity sensors require complex preparation methods and are expensive. Therefore, we report polyvinyl alcohol/chitosan/nano carbon powder (PVA/CS/NCP) humidity-sensitive composite materials, which were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and contact angle measurements. A resistive humidity sensor was fabricated using screen printing, and the device showed a good response at 33%RH-98%RH humidity, and at 98 % RH, the sensor achieved a response of 1.74. A fully printed field-effect transistor (FET) humidity sensor was prepared by integrating an ion gel transistor with a CS/PVA/NCP humidity-sensitive resistor to improve the response. The comparison reveals a significant improvement in the FET humidity sensor's response, reaching 6.27 at 98 % RH. In addition, both types of sensors exhibit less hysteresis and good repeatability. Lastly, we tested the constructed humidity sensors under non-contact and variable breathing conditions, laying the groundwork for future wearable applications.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Hongchao Shi,Huihui Wang,Xia Cui,Ziang Gao,Jiao Jia,Haifeng Xu
Nickel vanadium layered double hydroxide (NiV-LDH) is a highly promising electrode material for supercapacitors , but its poor electrochemical durability and conductivity limit its capacitance performance as a high-performance supercapacitor electrode. In contrast, titanium nitride (TiN) stands out for its outstanding electrochemical durability and superior conductivity. In this work, a composite material (TiN@NiV-LDH) with outstanding electrochemical performance was prepared by a simple hydrothermal method , where nickel vanadium layered double hydroxide nanosheets were vertically grown in a staggered manner on the surface of amorphous titanium nitride nanoparticles . The results demonstrate that at a current density of 2 A g −1 , the capacitance of TiN@NiV-LDH reaches 712.4 F g −1 . In addition, the assembled TiN@NiV-LDH//AC asymmetric supercapacitor exhibits a high energy density of 136.5 Wh kg −1 at a high power density of 1549.9 W kg −1 , and after 10,000 cycles at a high current density of 20 A g −1 , it retains 80.2 % excellent cyclic stability. This work, based on nickel vanadium layered double hydroxide and utilizing titanium nitride modification, aims to enhance the long-term stability of nickel vanadium layered double hydroxide while preserving its advantageous properties, providing a promising strategy for designing efficient supercapacitor electrodes.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Zhenya Zhang,Bolong Li,Jianghao Wang,Jing Li,Jie Fu
The quest for economical and efficient heterogeneous catalysts for the synthesis of long-chain α-olefins from biomass-derived fatty acids is of utmost significance. Regrettably, the generation of olefins by the dehydrative decarbonylation of fatty acids without the inclusion of additives is seldom documented. This scarcity is mostly attributed to the occurrence of competing decarboxylation and cracking processes. In this study, bimetallic CoZn@NC catalysts were prepared by decomposing ZIFs (CoZn) via a semisacrificial template-assisted strategy. The resulting CoZn@NC-900 catalysts are highly efficient and outperform Pt/C in stearic acid decarbonylation. In a batch reactor, these catalysts demonstrate 85.8% stearic acid conversion with up to 52.4% combined alkene yield at 350 °C for 1 h. The binding of N and Co forms the active decarbonylation sites, while Zn promotes the formation of Co subnanoparticles through spatial segregation effects, effectively reducing the acidity of the catalyst and thus ultimately inhibiting C–C cracking. Moreover, the CoZn@NC catalysts showed good stability, and the catalytic decarbonylation activity was maintained after several consecutive uses. This work presents a cost-effective strategy for the efficient catalytic decarbonylation of carboxylic acids with the inhibition of C–C cracking and shows promise for enabling the production of high-value olefins from biomass sources.
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