RSC Advances
·
2017
·Vol. 7
·期 65
·40761-40766
·
IF 3.108
Jin Jiang,Feixiang Liu,Kunyi Zhuang,Danqing Chen,Guohua Chen
In this work, we developed a single-step process to cast epoxy composites having a high thermal conductivity but a low electric conductivity. Performance of the epoxy was improved by incorporating diamond microparticles that were covered with few-layer graphene sheets on surfaces. We found not only did this modified filler improve the dispersion of diamond in the polymer matrix but it also decreased the interfacial thermal resistance between the diamond and epoxy while preserving an excellent electrical insulation. Graphene on diamond particle surfaces was synthesized by a vacuum-based heating procedure. After 70 wt% of diamond fillers were added, we obtained a composite having a thermal conductivity of 2.85 W m−1 k−1, which is 101% better than that of the composite with 70 wt% pure diamond as the filler, and 1190% better than that of a neat epoxy, with electrical resistivity maintained at 2.2 × 1010 Ω m.
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TALANTA
·
2017
·
IF 4.162
Sheng Niu,Lijuan Zheng,Abdul Qayyum Khan,Guang Feng,Heping Zeng
A fast and sensitive analysis for trace level heavy metals in aqueous solution was realized by using an improved laser induced breakdown spectroscopy (LIBS) methodology. Solutions containing heavy metal elements, Ni, Cr, and Cd, were concentrated in a laser-pretreated area (25 × 20 mm 2 ) of a polished aluminum target surface, wherein pretreated grooves enabled homogeneous distribution of the metallic solutions in the well-defined area, and laser ablation of the aluminum target produced unique plasma excitation of various metallic ions . For 1-mL solutions deposited, we obtained an analytical precision of about 7% relative standard deviation (RSD), and limits of detection (LODs) of 22, 19, and 184 μg/L for Ni, Cr, and Cd, respectively. Moreover, the laser-pretreated metallic microstructure allowed more solution deposited with the help of a hot plate, which supported improvement of LODs to sub-μg/L level for Cr and Ni and μg/L level for Cd with about 20-mL solution engaged in the enrichment processes. The applicability of the proposed methodology was validated on certified reference materials and real river water.
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Small
·
2017
·Vol. 13
·期 41
·1701648
·
IF 8.643
Qian Zhang,Pengsong Li,Daojin Zhou,Zheng Chang,Yun Kuang,Xiaoming Sun
Hydrogen evolution reaction (HER) has prospect to becoming clean and renewable technology for hydrogen production and Ni–Mo alloy is among the best HER catalysts in alkaline electrolytes. Here, an in situ topotactic reduction method to synthesize ultrathin 2D Ni–Mo alloy nanosheets for electrocatalytic hydrogen evolution is reported. Due to its ultrathin structure and tailored composition, the as-synthesized Ni–Mo alloy shows an overpotential of 35 mV to reach a current density of 10 mA cm −2 , along with a Tafel slope of 45 mV decade −1 , demonstrating a comparable intrinsic activity to state-of-art commercial Pt/C catalyst. Besides, the vertically aligned assemble structure of the 2D NiMo nanosheets on conductive substrate makes the electrode “superaerophobic,” thus leading to much faster bubble releasing during HER process and therefore shows faster mass transfer behavior at high current density as compared with drop drying Pt/C catalyst on the same substrate. Such in situ topotactic conversion finds a way to design and fabricate low-cost, earth-abundant non-noble metal based ultrathin 2D nanostructures for electrocatalytic issues.
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Green Energy & Environment
·
2024
·
IF 10.7
Meng-Ying Liu,Zhe-Hui Zhang,Xue-Qi Wang,Qian Sun,Chen Zhang,Yu Li,Zhuohua Sun,Katalin Barta,Feng Peng,Tong-Qi Yuan
Developing a cost-effective and environmentally friendly process for the production of valuable chemicals from abundant herbal biomass receives great attentions in recent years. Herein, taking advantage of the “lignin first” strategy, corn straw is converted to valuable chemicals including lignin monomers, furfural and 5-methoxymethylfurfural via a two steps process. The key of this research lies in the development of a green and low-cost catalytic process utilizing magnetic Raney Ni catalyst and high boiling point ethylene glycol. The utilization of neat ethylene glycol as the sole slovent under atmospheric conditions obviates the need for additional additives, thereby facilitating the entire process to be conducted in glass flasks and rendering it highly convenient for scaling up. In the initial step, depolymerization of corn straw lignin resulted in a monomer yield of 18.1 wt%. Subsequently, in a dimethyl carbonate system, the carbohydrate component underwent complete conversion in a one-pot process, yielding furfural and 5-methoxymethylfurfural as the primary products with an impressive yield of 47.7 %.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ali Asghar,Muhammad Shahid Rashid,Muhammad Saqib,Karim Khan,Zhiyuan Liu,Changyong Liu,Zhangwei Chen
The quest for sustainable energy storage solutions has led to the development asymmetric supercapacitors (ASCs) that promise high specific power and energy. However, the challenge lies in synthesizing electrode materials that can meet these demands while maintaining stability. Herein, we introduce a paradigm-shifting approach by harnessing the power of direct ink writing (DIW) 3D printing to fabricate SiOC/Bi 2 O 3 nanocomposites for ASCs. Through a facile hydrothermal synthesis, we prepared SiOC/Bi 2 O 3 nanocomposites that, when 3D printed (3DP), delivered an impressive energy density of 98.2 Wh/kg and a power density of 882.4 W/kg at 1 A/g. These ASCs exhibited remarkable cyclic stability, retaining 95.55 % of their capacitance after 5,000 cycles. The synergy between the high surface area of DIW-printed SiOC/Bi 2 O 3 and its capacitive properties satisfies the high-voltage profile requirement and enhances both specific power and energy. Our study paves the way for a new generation of ASCs with superior electrochemical performance, offering a sustainable and environmentally friendly solution to the future of energy storage. This work stands at the forefront of merging advanced material science with cutting-edge manufacturing techniques, showcasing the potential of 3D printing to revolutionize the energy storage landscape.
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NEW CARBON MATERIALS
·
2024
·
IF 6.5
Xu Chen,Jin-yu Zhao,Wen-sheng Zhang,Xiao-min Wang
Designing efficient and robust catalysts for hydrogen evolution reaction (HER) is imperative for saline water electrolysis technology. A catalyst composed of Co x P nanowires array with N-doped carbon nanosheets (NC) was fabricated on Ni foam (NF) by an in-situ growth strategy. The material is designated as NC/Co x P@NF. In the preparation process, Co(OH) 2 nanowires were transformed into a metal organic framework of cobalt (ZIF-67) on NF by the dissolution-coordination of endogenous Co 2+ and 2-methylimidazole. The resulting cactus-like microstructure gives NC/Co x P@NF abundant exposed active sites and ion transport channels, which improve the HER catalytic reaction kinetics. Furthermore, the interconnected alternating nanowires and free-standing nanosheets in NC/Co x P@NF improve its structural stability, and the formation of surface polyanions (phosphate) and a NC nanosheet protective layer improve the anti-corrosive properties of catalysts. Thus, the NC/Co x P@NF has an excellent performance, requiring overpotentials of 107 and 133 mV for HER to achieve 10 mA cm −2 in 1.0 mol L −1 KOH and 1.0 mol L −1 KOH + 0.5 mol L −1 NaCl, respectively. This in-situ transformation strategy is a new way of constructing highly-efficient HER catalysts for saline water electrolysis.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 47
·33301-33313
·
IF 10.7
Yantong Long,Guoliang Zhao,Liuxin Yang,Yongjun Xu,Chen Xu
Efficient bifunctional catalysts for hydrogen/oxygen evolution reactions (HER/OER) are critical for industrial application of overall water splitting. Herein, a self-supported nanostructure consisting of CoNi–P and embedded carbon dots (denoted as CoNi–P/CDs/NF) with large specific surface area has been designed and fabricated, through a phosphorization process on precursors grown on 3D porous Ni foam. The resultant electrocatalyst exhibited excellent electrocatalytic performance for both the HER (45.2 mV@10 mA cm−2) and OER (184.8 mV@20 mA cm−2) under alkaline conditions. The cell voltage of the full water splitting device assembled was only 1.50 V to achieve 20 mA cm−2 and exhibited great durability benefiting from the self-supported nanostructure. The density functional theory (DFT) calculations and XPS analysis suggest that the synergistic coupling effect between CDs and substrate CoNi–P could tune the electronic structure. Moreover, the embedded CDs increase electrical conductivity and active sites of the catalyst. Both of these and the high specific surface benefited from the 1D/3D hierarchical structure could explain the excellent electrocatalytic performance. The rational materials design of 1D/3D hierarchical structured non-noble bimetallic phosphide catalysts in this work may suggest a new strategy for designing bifunctional electrocatalysts.
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Advanced Science
·
2024
·Vol. 11
·期 41
·2405544
·
IF 14.3
Kejun Wang,Siyuan Chen,Guanyu Bao,Tao Sun,Junqiu Zhang,Daobing Chen,Lining Sun,Zhiwu Han,Chao Liu,Qian Wang
Numerous plants evolve ingeniously microcantilever-based hairs to ultra-sensitively detect out-of-plane quasi-static tactile loads, providing a natural blueprint for upgrading the industrial static mode microcantilever sensors, but how do the biological sensory hairs work mechanically? Here, the action potential-producing trigger hairs of carnivorous Venus flytraps ( Dionaea muscipula ) are investigated in detail from biomechanical perspective. Under tiny mechanical stimulation, the deformable trigger hair, composed of distal stiff lever and proximal flexible podium, will lead to rapid trap closure and prey capture. The multiple features determining the sensitivity such as conical morphology, multi-scale functional structures, kidney-shaped sensory cells, and combined deformation under tiny mechanical stimulation are comprehensively researched. Based on materials mechanics, finite element simulation, and bio-inspired original artificial sensors, it is verified that the omnidirectional ultra-sensitivity of trigger hair is attributed to the stiff-flexible coupling of material, the double stress concentration, the circular distribution of sensory cells, and the positive local buckling. Also, the balance strategy of slender hair between sensitivity and structural stability (i.e., avoiding disastrous collapse) is detailed revealed. The unique basic biomechanical mechanism underlying trigger hairs is essential for significantly enhancing the performance of the traditional industrial static mode microcantilever sensors, and ensure the stability of arbitrary load perception.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yanling Wang,XueYi Zhao,YaXiao Cui,Xianan Wang,Yu Wang,Yanru Liu,Mingming Zhang,Lei Wang
The keys to future energy transformation is the development of stable and efficient non-precious electrocatalysts . Here, we demonstrate a novel synthesis method for ultra-thin carbon coated Ni 3 N nanosheets supported by carbon array with bionic flower structure in-situ grown on nickel foam (C@Ni 3 N@C/NF), in which the hollow carbon rods supporting the carbon-coated Ni 3 N nanosheets at the bottom. And the hollow carbon rod can accelerate the transport of electrons to the ultra-thin 2D Ni 3 N nanosheet through a one-dimensional directional structure. The obtained C@Ni 3 N@C/NF as a monometallic nickel-based catalyst exhibits excellent HER electrocatalytic performance in 1 M KOH, which only need the overpotential of 60 mV to reach the current density of −10 mA cm −2 . More importantly, this method can provide new ideas for the synthesis of other non-precious metal electrocatalysts with biomimetic structure.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xu Chen,Yunrui Duan,Huanglin Dou,Wensheng Zhang,Xiaomin Wang
The development of transition metal phosphides (TMPs) electrocatalysts with appropriate binding strength towards intermediates and resistant to chlorine in alkaline seawater electrocatalysis remains a formidable challenge. Herein, an approach for manipulating electron redistribution in Ni 2 P/Ni 5 P 4 treated by Co cationic doping engineering (denoted as Act-Co-NiPx) is proposed, exhibiting excellent catalytic activities and stability toward HER in alkaline seawater solution. First-principles calculations demonstrate that the Co doping can effectively adjust the electron redistribution of Ni 2 P/Ni 5 P 4 , resulting in a reduction in the hydrogen adsorption free energy for HER and an acceleration in the interfacial charge transfer. Furthermore, the enhanced Cl - adsorption energy avoids the toxicity of Cl - to the active sites in alkaline seawater splitting. Consequently, the resulting Act-Co-NiPx catalyst demonstrates remarkable HER performance with low overpotentials of 77 and 97 mV at a current density of 10 mA cm −2 in both 1.0 M KOH and 1.0 M KOH+Seasalt electrolytes. Furthermore, the seasalt electrolyzer assembled from Act-Co-NiPx achieves the low cell voltage of 1.63 V at 10 mA cm −2 . This work demonstrates a feasible method for designing cost-effective and stable catalysts with excellent selectivity via regulating the electronic structure of TMPs for seawater electrolysis.
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FOOD CONTROL
·
2024
·
IF 5.6
Kai Jiang,Yiwei Huang,Rui Cui,Yuyue Qin,Thanapop Soteyome,Margaret Brennan,Charles Brennan
In this study, we screened out the dominant spoilage microorganisms during the cold storage of morels, prepared composite paper with a targeted selection of antimicrobial active substances, applied the composite paper to morels for cold storage and preservation, and investigated the changes of physicochemical indexes, flavor-presenting nucleotides and enzyme activities throughout the process of storage, and evaluated the freshness preservation effect. The pathogenic microorganisms during the natural spoilage of Morels were isolated and purified at 4 °C. The dominant spoilage microorganisms obtained were: bacterium B1 ( Lelliia amnigena ), fungi F2 ( Paecilomyces penicillatus ) and F3 ( Mucor hiemalis ). Inhibition experiments were carried out by selecting various active antimicrobial agents—lemon essential oil, clove essential oil and nisin (NI)—against the dominant spoilage microorganisms B1, F2 and F3. Comparing the inhibitory effects, NI was selected as an inhibitor for the dominant spoilage microorganisms following comprehensive consideration. The antimicrobial system (NI/C-CNC) was prepared by incorporating NI into carboxylated cellulose nanocrystals (C-CNC), and it exhibited a strong blocking effect on ultraviolet rays, which became more pronounced with the increase of NI addition. The composite paper NI-C was prepared using the NI/C-CNC antimicrobial system and absorbent paper (100 % virgin wood pulp), which showed better mechanical properties and reduced water vapor transmission rate (WVP). NI-C composite paper was applied to the preservation of morels, which effectively inhibited the dominant pathogenic bacteria. The flavor 5′-nucleotides were effectively protected, and it significantly slowed down the change in hardness during storage of morels. It also inhibited lipid peroxidation, as evidenced by the accumulation of malondialdehyde (MAD) content and reactive oxygen species (ROS), and had a positive effect on the control of enzyme activity. NI-C antimicrobial composite paper has good application prospects in the field of packaging of morels.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 39
·2404772
·
IF 27.4
Ning Sun,Zhichuan Zheng,Zhuangzhuang Lai,Junjie Wang,Peng Du,Tianping Ying,Haifeng Wang,Jianchun Xu,Runze Yu,Zhiwei Hu,Chih-Wen Pao,Wei-Hsiang Huang,Ke Bi,Ming Lei,Kai Huang
While high-entropy alloys, high-entropy oxides, and high-entropy hydroxides, are advanced as a novel frontier in electrocatalytic oxygen evolution, their inherent activity deficiency poses a major challenge. To achieve the unlimited goal to tailor the structure–activity relationship in multicomponent systems, entropy-driven composition engineering presents substantial potential, by fabricating high-entropy anion-regulated transition metal compounds as sophisticated oxygen evolution reaction electrocatalysts. Herein, a versatile 2D high-entropy metal phosphorus trisulfide is developed as a promising and adjustable platform. Leveraging the multiple electron couplings and d–p orbital hybridizations induced by the cocktail effect, the exceptional oxygen evolution catalytic activity is disclosed upon van der Waals material (MnFeCoNiZn)PS 3 , exhibiting an impressively low overpotential of 240 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 32 mV dec −1 , and negligible degradation under varying current densities for over 96 h. Density functional theory calculations further offer insights into the correlation between orbital hybridization and catalytic performance within high-entropy systems, underscoring the contribution of active phosphorus centers on the substrate to performance enhancements. Moreover, by achieving electron redistribution to optimize the electron coordination environment, this work presents an effective strategy for advanced catalysts in energy-related applications.
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