SOLAR ENERGY
·
2022
·
IF 7.188
J. Yan,B.W. Yang,C.Y. Zhao
Thermochemical energy storage (TCES) is a promising energy storage method because of its high energy storage density and long-term storage ability. The reactor is the most critical part of the TCES system, and the fluidized bed reactor (FBR) is a novel reactor, which is not restricted by the low effective thermal conductivity of energy storage materials. However, there is little theoretical guidance about the design and operation of the FBR for a TCES system. In this study, we investigated the performance of an FBR using MgO/Mg(OH) 2 as reaction materials by establishing a numerical model followed by experimental validation. The influence of operating parameters on the bed temperature was discussed based on numerical results. According to the sensitivity analysis, the reactor inner diameter, material mass, and inlet gas velocity were the main factors affecting the bed temperature. The optimal boundary surface temperature was analyzed, which influences the proportion of TCES in the total heat storage.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Y.F. Wang,X. Luo,W.J. Lu,L. Yang,B. Huang,P.T. Li,Y.Q. Yang
Pt group metals display lower HER activity in alkaline solution than in acidic solution, because they are inefficient in the water dissociation step (Volmer step). Compared with Pt, the activity difference of Rh in alkaline and acidic media is much smaller. Meanwhile, Ni(OH) 2 is proved to be an effective catalyst for water dissociation. Therefore, Rh–Ni(OH) 2 /C nanocomposites with different Rh:Ni(OH) 2 ratios were synthesized by a co-deposition/partial reduction method, and their microstructures as well as electrocatalytic properties were studied. The results show that Rh and Ni(OH) 2 display synergistic effect in Rh–Ni(OH) 2 /C nanocomposites. The Rh–Ni(OH) 2 /C nanocomposite with a molar ratio of Rh to Ni(OH) 2 of 1:1 exhibits the highest activity. It shows an overpotential of 36 mV at 10 mA cm −2 and a Tafel slope of 32 mV dec −1 for HER in alkaline media , which is superior to commercial Pt/C. In addition, the Rh–Ni(OH) 2 /C (1:1) nanocomposite shows excellent durability in alkaline media as well.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Debin Jiang,Xiaoping Wang,Li Feng,Yichang Yu,Jie Hu,Xiaoying Liu,Hong Wu
In this study, a novel nano-La(OH) 3 /porous carbon composites derived from La alginate xerogel with egg-box structure had been successfully synthesized by a gradient heat treatment in nitrogen atmosphere. This facile fabrication strategy can be easily employed to considerably encapsulate La(OH) 3 nanoparticles uniformly into the porous carbon matrix derived from the alginate macromolecule framework. The optimized sample, labeled as LS-550(N), exhibited extremely high phosphate uptake and great selectivity. The adsorption kinetic process dramatically followed pseudo-second-order model. The Langmuir model fitted maximum equilibrium adsorption capacity is 133.58 mg·g −1 . The phosphate adsorption mechanisms could be consist of electrostatic interaction, complexation and ligand exchange interaction on the surface of LS-550(N). The prominent practical applicability of LS-550(N) in the regeneration test suggests that the LS-550(N) could be a potential adsorption candidate for the decontamination of phosphate-containing natural water bodies.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zeyu Jiang,Rui Dong,Mingjiao Tian,Chi He,Yani Wu,Mudi Ma,Shouning Chai
Realizing the simultaneous adsorption and activation of O 2 and reactants over supported noble metal catalysts is crucial for the oxidation of organic hydrocarbons. Herein, we report a facile one-step ethylene glycol reduction method to synthesize difunctional Au(OH)K x sites, which were anchored on a hierarchical hollow MFI support and adopted for acetone decomposition. The alkali ion-associated adjacent surface hydroxyl groups were coordinated with Au nanoparticles , resulting in partially oxidized Au 1+ sites with improved dispersion. The results obtained from exclusive ex situ and in situ experiments illustrated that the proper content of K and hydroxyl groups significantly enhanced the adsorption of surface O 2 and acetone molecules around the Au sites simultaneously, whereas the excess K species inhibited the catalytic performance by blocking the pore structure and decreasing the acidity of catalysts. The Au(OH)K 0.7 /h-MFI catalyst exhibited the highest efficiency for acetone oxidation, over which 1500 ppm acetone can be completely oxidized at just 280 °C with an extremely low activation energy of 32.5 kJ mol −1 . The carbonate species were detected as the main intermediates during acetone decomposition over the difunctional Au(OH)K x sites through a Langmuir − Hinshelwood (L − H) mechanism. This finding paves the way for designing and constructing efficient functional active sites for the complete oxidation of hydrocarbons.
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Environmental Science-Nano
·
2023
·Vol. 10
·期 10
·2744-2753
·
IF 7.3
Jiaxin Lv,Ruixin Chen,Zhen Wu,Yang Bai,Han Song,Chen Tian,Mengye Wang,Zhang Lin
The enrichment of microplastics in polar ice is a typical phenomenon discovered in recent years. Thus, it is worthwhile to explore the degradation behavior of microplastics in frozen environments, which is crucial to evaluate their impact on polar ecosystems. Here, taking polystyrene (PS) as an example, the degradation behaviors of MPs in frozen anoxic Fe(II)-containing solutions were investigated. The results revealed that PS degradation rate in frozen solution was 14.6-fold higher than that in water. Mechanism study showed that freezing-induced aggregation and extrusion of PS enhanced the generation of environmentally persistent free radicals (EPFRs), which in turn contributed to the formation of H2O2. Moreover, freezing-induced enrichment of Fe(II) further interreacted with H2O2 to form Fe(IV) and OH free radicals at a pH of ∼6.5, and thus accelerated the degradation of PS. Such reaction was accompanied by the formation of Fe(III)-containing products, which would further react with aged PS to produce new EPFRs and Fe(II). Such cycles of aged PS/EPFRs and Fe(III)/Fe(II) continued to accelerate the degradation of PS in the frozen solution. This study provides an overlooked pathway for microplastic degradation in frozen Fe(II)-containing solutions, which would be of key importance to understand the degradation behaviors of microplastics in frozen environments.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Tingting Fan,Li Cai,Zhulin Huang,Haibin Tang,Lijun Zhang,Zhongbo Li
A simple and reliable method is developed to fabricate Ag-nanoparticle-decorated Co(OH)2 nanoflowers grafted on polyacrylonitrile (PAN) nanopillar arrays as uniform and sensitive surface-enhanced Raman scattering (SERS) substrates. First, Co(OH)2-nanosheet-assembled nanoflowers are achieved on the highly uniform PAN nanopillar arrays via electrochemical deposition. Then, Ag nanoparticles (Ag-NPs) are decorated onto the Au-nanoparticle-precoated Co(OH)2 nanoflowers based on a spontaneous redox reaction (SRR) between the silver ions and Co(OH)2 nanosheets at room temperature. Ag-NPs can be successfully in situ synthesized on the Co(OH)2 nanoflowers, and Au nanoparticles precoated on the surface of the Co(OH)2 nanosheets can ensure that the Co(OH)2 nanoflower structure does not collapse. Because of the highly uniform PAN nanopillar arrays and the high-density sub-10 nm gaps between the neighboring Ag-NPs on the surface of the Co(OH)2 nanoflowers, the hierarchical three-dimensional Ag@Co(OH)x grown on PAN nanopillar arrays can produce a reproducible and sensitive SERS effect. To verify the SERS performance of the substrate, 4-aminothiophenol (4-ATP) is used as the probe molecule, and the Ag@Co(OH)x grown on PAN nanopillar arrays is employed as the SERS substrate. As a result, 4-ATP concentrations as low as 10–10 M can still be identified, exhibiting high SERS activity. Additionally, the relative standard deviation value of the main characteristic peak of 10–5 M 4-ATP is 9.43%, indicating good uniformity of the SERS signal of the substrate. The SRR between silver ions and Co(OH)2 can provide a simple route to prepare heterostructures as SERS substrates, which has great potential for application in the field of analysis.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Tongchen Zhang,Huan Wu,Matin Naghizadeh,Qian Zheng,Sheying Dong
Further improvement on the adsorption performance of microporous organic polymers (MOPs) by delicate design remains a challenge. Herein, a magnetic hydroxyl-functioned microporous organic polymer (Fe3O4/Hy-MOP) was prepared and characterized by a series of techniques, including transmission electron microscopy, vibration sample magnetometry, Fourier transform infrared spectrometry, thermal gravimetric analysis, and zeta potential analysis. As an adsorbent for ultrasound-assisted magnetic solid phase extraction of three personal care products (PCPs, triclosan, triclocarban, and 2-hydroxy-4-methoxybenzophenone), the obtained Fe3O4/Hy-MOP exhibited excellent performance in extracting three PCPs (89–95%) from water samples owing to its hydrophilicity, inherent microporous structure, and easy magnetic separation. Moreover, probing of adsorption behavior by triclosan upon Fe3O4/Hy-MOP surfaces demonstrated that the adsorption process followed the models of Freundlich isotherm, together with pseudo-second-order kinetics. The extraction and adsorption mechanism involved polar force, π–π interaction, and hydrophobic interaction between Fe3O4/Hy-MOP and PCPs. Particularly, the stability and magnetism of Fe3O4/Hy-MOP confer excellent cycling performance, allowing for five recycling iterations without a significant decrease in performance. Such results indicated that magnetic adsorbent Fe3O4/Hy-MOP has potential for application in the extraction and removal of PCPs from actual water samples.
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COMBUSTION AND FLAME
·
2023
·
IF 4.4
Yuxiang Li,Kaili Zhang
Metastable intermolecular composites (MICs) comprising solid fuels and oxidizers at nano-scale exhibit high energy densities and fast reaction speeds. As most metal and metalloid fuels are passivated by the natural oxide layer on the surface which acts as a reaction barrier, fluorine-containing oxidizers are of particular interest to promote the reactivity through interfacial fluoridation. In this work, cobalt hydroxy fluoride (Co(OH)F) was introduced as a functional fluorine-containing oxidizer, and core-shell structured Co(OH)F@Al nanoarray was fabricated onto a glass substrate . The thermal behavior and reaction mechanism of pure Co(OH)F and Co(OH)F@Al composites were thoroughly investigated, and Co(OH)F@Al was compared with CoO@Al and Co 3 O 4 @Al with identical morphology. In the Co(OH)F@Al composite, a pre-ignition reaction was observed which was attributed to the etching of Al 2 O 3 shell by HF and the fluoridation of Al core by HF and CoF 2 . With the assistance of pre-ignition reaction, Co(OH)F@Al can complete main exothermal reaction before Al melting in a solid-state mechanism, and its peak temperature is around 200 ℃ lower than those of MICs employing CoO and Co 3 O 4 as oxidizers.
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Micromachines
·
2023
·Vol. 14
·期 4
·870
·
IF 3.4
Huan Wang,Mingxuan Dong,Baorui Shao,Yaodan Chi,Chao Wang,Sa Lv,Ran Duan,Boqi Wu,Xiaotian Yang
N-TiO2/Ni(OH)2nanofiber was successfully prepared by combining the electrospinning and solvothermal method. It has been found that under visible light irradiation, the as-obtained nanofiber exhibits excellent activity for the photodegradation of rhodamine B, and the average degradation rate reaches 3.1%/min−1. Further insight investigations reveal that such a high activity was mainly due to the heterostructure-induced increase in the charge transfer rate and separation efficiency.
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Small Methods
·
2026
·
IF 8.7
Rimsha Abbas,Muhammad Umair,Zhao Fu,Jingjing Luo,Suzhu Yu,Jun Wei
Omnidirectional strain sensors capable of detecting large and complex deformations are highly promising for wearable motion monitoring; however, achieving both multidirectional strain perception and enhanced electrical sensitivity remains challenging. Herein, a peelable circular piezoresistive strain sensor based on KH570-modified hydroxylated multi-walled carbon nanotubes (m-MWCNT-OH)/Ecoflex is developed through a screen-printing strategy and further functionalized with a copper (II) 2,3,6,7,10,11-hexahydroxytriphenylene (Cu 3 (HHTP) 2 ) conductive metal-organic framework (c-MOF)/poly(3,4-ethylenedioxythiophene) nanofiber (PEDOT-NFs) nanolaminate. The circular sensing architecture facilitates uniform strain distribution and orientation-independent strain transfer, while the c-MOF/PEDOT-NFs coating constructs additional conductive pathways, enhancing strain-induced resistance variation. The sensor is fabricated using a sequential process involving screen printing of the m-MWCNT-OH/Ecoflex sensing layer, peel transfer, and spray deposition of the functional coating. The resulting sensor demonstrates a wide strain detection range of 0%–300%, a gauge factor (GF) of 8, a fast response time of 33 ms, a recovery time of 420 ms, and stable performance over 10 000 loading-unloading cycles. Compared with unmodified sensor, c-MOF/PEDOT-NFs functionalization significantly improves electrical sensitivity while maintaining the intrinsic omnidirectional sensing capability. Finite element analysis (FEA) confirms similar strain-transfer characteristics under different loading directions. The sensor enables accurate monitoring of multidirectional human motions, highlighting its potential for wearable electronics, soft robotics, and human-machine interfaces.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xupo Liu,Ran Wang,Mengyun Wei,Xihui Wang,Jiayao Qiu,Jingru Zhang,Shilong Li,Ye Chen
Electrochemical oxidation of biomass-based 5-hydroxymethylfurfural (HMF) is an effective approach for achieving the high-value products of 2,5-furandicarboxylic acid (FDCA). However, the restricted formation of high-valence metal active species for electrocatalysts results in a sluggish kinetic process of HMF oxidation reaction (HMFOR). Herein, we fabricated the Ni 3+ -rich cross-linked α-Ni(OH) 2 nanosheets for accelerating the HMFOR through an anion-mediated strategy. It is identified that the Cl − ions with strong penetrability replace a portion of lattice oxygen atoms in α-Ni(OH) 2 to form Ni-Cl bonds, contributing to breaking the inherent lattice order and generating a special Ni 3+ -rich structure. Owing to the promoted adsorption and accelerated oxidation of hydroxyl and aldehyde groups by the affluent Ni 3+ active species, the large oxidation current density of 116.5 mA cm −2 and HMFOR kinetic constant of 0.067 min −1 has been achieved at 1.45 V (vs. RHE). By analyzing the oxidation products, the FDCA yield and Faradic efficiency are both higher than 99.25 % and 99.36 % for five successive determinations. Therefore, this work provides an insightful anion-mediated strategy for designing high-performance electrocatalysts for biomass conversion application.
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Jingyi Lu,Pengfei Jia,Can Liao,Zhoumei Xu,Fukai Chu,Mutian Zhou,Bin Yu,Bibo Wang,Lei Song
The progress of super-robust, high ductile polymeric nanocomposite with superior safety have been caught increasing eyesight for the application in electronic products. In this article, strontium hydroxystannate (SSO) nanorods were in-situ fabricated on the surface of titanium carbide (Ti 3 C 2 T x ) MXene nanosheets (MSSO) for improving fire safety and mechanical property of thermoplastic polyurethane (TPU) to further applications of portable devices. With biomimetic method, the tensile robustness and toughness of TPU-2.0MSSO was enhanced by 46% and 126%, respectively. In addition, the TPU-MSSO nanocomposites performed leaf vein-inspired hierarchical structure during the stretching behavior, resulting 55% enhancement of elongation at break . Furthermore, the fire safety was systematically evaluated, and the peak heat release rate (pHRR) decreased by 37.31%. Above all, hazardous pyrolysis products of TPU during the combustion were also efficiently reduced, especially the generation of carbon oxide (CO) and carbon dioxide (CO 2 ) were decreased by 96.04% and 89.85% when the additive of MSSO was only 2 wt%. As a result, ternary catalytic effect and labyrinth structure improved the safety of TPU in modern electronic products. Hence, this leaf vein-inspired TPU-MSSO nanocomposites not only exhibit superior toughness but also reinforce fire safety while facing thermal runaway, which was significant to destroy the formation of thermal disaster chain and maintain further applications of additional products for portable devices, and package materials for flexible electronics.
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危险品化学品经营许可证（带存储）