CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Mengxia Shen,Jiale Qi,Kun Gao,Chao Duan,Jun Liu,Qingqing Liu,Hao Yang,Yonghao Ni
Fe-N x C single-atom catalysts have been immensely explored as the most promising ORR catalysts for replacing noble metals. Nevertheless, how to precisely introduce Fe atoms to optimize their spatial distribution and coordination environment in carbonaceous matrices while constructing the hierarchical porous structures to facilitate the mass transport process and ensure the accessibility of Fe-N x sites remain significant challenges. Here, we propose a strategy to prepare porous N -doped carbon aerogels anchored with single atomic Fe sites (Fe-SA@PNC) as highly efficient ORR electrocatalysts via directional freeze-casting and chemical vapor deposition. Fe-SA@PNC exhibit remarkable ORR activity and stability due to the highly stable honeycomb morphology and hierarchical pore structure, as well as the atomically dispersed Fe-N 4 sites in the carbon support. Furthermore, the practical application of Fe-SA@PNC catalysts as cathode materials in Zn-air batteries was demonstrated with encouraging performance. This study provides a promising approach for constructing high-efficiency ORR single-atom catalysts.
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MATERIALS RESEARCH BULLETIN
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2023
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IF 5.4
Kangtai Ou,Zheming Liu,Zixuan Liu,Qiang Fu,Yang Cao,Qichao Liu,Youyi Sun
It is still a high challenge to develop environmental-friendly and highly efficient flame retardant for application in thin polymer coating. Here, a graphene@glass sheets composite flame retardant is developed and prepared by a new in-situ liquid-phase exfoliation process. When the flame retardant is doped into polymer coating, it exhibits excellent flame retardancy for flammable plastic, wood and nonflammable steel. The limiting oxygen index (ca.32.3%) and UL-94 V-0 rating of a ultra-thin polymer coating (ca.65 um) can be obtained for fire protection of wood. The long fire-retardant time (55.0min) is also observed, which is far longer than that of the conventional polymer coating (1.0 min) for fire protection of steel. This work provides a new strategy for creating cost-effective thin flame retardant polymer coatings for various industrial applications.
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SOLID STATE SCIENCES
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2023
·
IF 3.5
Beibei Zhu,Jie Zhou,Lubin Ni,Guowang Diao
Rapid pollutant removal technology has increasingly become one of the main components of environmental governance technology. Herein, porous g-C 3 N 4 /three-dimensional high elastic graphene sponge (CN/HEGS) composites were fabricated by introducing porous g-C 3 N 4 into three-dimensional highly elastic graphene sponge. The structure, morphology, light absorption ability and charge separation of the composite were characterized by a series of detection methods. The optimal CN/HEGS-90 presented high adsorption capacity and photocatalytic activity for tetracycline. The synergism of adsorption and photocatalysis is the main reason for the rapid degradation of the composites. The polymerization of amino compounds with epoxy bonds is the essence of the formation of three-dimensional interconnected porous sponge with high adsorption performance. The introduction of CN with visible light adsorption property and the composite structure formed between CN and HEGS promote efficient photogenerated charge transfer and transmission. This work provides an idea for the design and synthesis of composite catalysts with high efficiency and rapid pollutant degradation.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2023
·Vol. 24
·期 5
·4981
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IF 5.6
Meiling Zhang,Xiaoming Yu,Mengyi Sheng,Hua Chen,Bailin Chen
Herein, we present a mussel-inspired supramolecular polymer coating to improve the an-ti-corrosion and self-healing properties of an AZ31B magnesium alloy. A self-assembled coating of polyethyleneimine (PEI) and polyacrylic acid (PAA) is a supramolecular aggregate that takes advantage of the weak interaction of non-covalent bonds between molecules. The cerium-based conversion layers overcome the corrosion problem between the coating and the substrate. Catechol mimics mussel proteins to form adherent polymer coatings. Chains of PEI and PAA interact electrostatically at high density, forming a dynamic binding that causes strand entanglement, enabling the rapid self-healing properties of a supramolecular polymer. The addition of graphene oxide (GO) as an anti-corrosive filler gives the supramolecular polymer coating a superior barrier and impermeability properties. The results of EIS revealed that a direct coating of PEI and PAA accelerates the corrosion of magnesium alloys; the impedance modulus of a PEI and PAA coating is only 7.4 × 103Ω·cm2, and the corrosion current of a 72 h immersion in a 3.5 wt% NaCl solution is 1.401 × 10−6Ω·cm2. The impedance modulus of the addition of a catechol and graphene oxide supramolecular polymer coating is up to 3.4 × 104Ω·cm2, outperforming the substrate by a factor of two. After soaking in a 3.5 wt% NaCl solution for 72 h, the corrosion current is 0.942 × 10−6A/cm2, which is superior to other coatings in this work. Furthermore, it was found that 10-micron scratches were completely healed in all coatings within 20 min, in the presence of water. The supramolecular polymer offers a new technique for the prevention of metal corrosion.Keywords:supramolecular polymer;self-healing;anti-corrosion;graphene oxide;cerium conversion
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JOURNAL OF POROUS MATERIALS
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2023
·Vol. 30
·期 5
·1485-1497
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IF 2.6
Jiang Leilei,Hu Xuebing,Yang Boshen,Yang Zhiyong,Lu Chuanbiao
Diethylene triamine (DETA) reduced graphene oxide aerogel (DRA) was fabricated by self-assembly and freeze-drying method. The effects of preparation processes, including reduction temperature and DETA concentration, on the aerogel performance were investigated. It can be found that the density of the as-prepared DRA-8 is as low as 11. 15 mg/cm 3 when the DETA concentration is 16 µL/mL, and the reduction temperature is 95 °C. And the DRA-8 has abundant macro-pores between 10 and 100 μm in size. Meanwhile, using azo dyes as adsorbates, the adsorption capacities of DRA-8 under different process conditions were examined. The results demonstrate that the pseudo-second-order model and the Langmuir isotherm model agree well with the experimental data. At 298 K, the adsorption capacities for methyl orange (MO) and methylene blue (MB) are up to 227.24 and 266.82 mg/g, respectively. The thermodynamics analysis presents the adsorption belongs to a spontaneous thermodynamic reaction. The adsorption mechanism of DRA-8 for MO and MB was also explained. Meantime, DRA-8 can have a high adsorption capacity for MB and MO after multiple cycles. All of these point to the possibility of using DRA-8 as a suitable adsorbent material for dye elimination from aqueous environments.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Kaicheng Zhang,Ming Yan,Yue Li,Faguang Ma,Yilin Wu
Membrane-based imprinted sites for achieving specific molecule transport and precise recognition have great potential to revolutionize nanofiltration technology . Nonetheless, how to efficiently prepare imprinted membrane structures with accurate identification - ultrafast molecular transport - high stability in mobile phase remains a key issue and serious challenge. Herein, we have developed a dual-activation strategy to constructing nanofluid-functionalized membranes with double imprinted nanoscale channels (NMDINCs), realizing ultrafast transport performance as well as structure&size-exclusion selectivity in allusion to particular compounds. The resultant NMDINCs, founded on principal nanofluid-functionalized construction companied by the boronate affinity sol-gel imprinting systems, illustrated that delicate regulation towards polymerization framework as well as functionalization belonging to distinctive membrane structures was crucial for realizing ultrafast molecules transport combined with prominent molecules selectivity. The synergistic recognition of covalent bonds and non-covalent bonds driven by two functional monomers effectively realized the selective recognition to template molecules, leading to the high selective separation factors of Shikimic acid (SA)/ Para hydroxybenzoic acid（PHA）, SA/ P nitrophenol（PN）and catechol（CL）for 8.9, 8.14 and 7.23, respectively. The dynamic consecutive transport outcomes exhibited that numerous SA-dependent recognition sites could still keep reactivity under pump-driven permeation pressure for appreciable time, forcefully proving the successful construction as to high-efficiency membrane-based selective separation system. It is anticipated that this strategy as to the in situ introduction of nanofluid-functionalized construction into porous membrane would hold great promise in preparing high-intensities membrane-founded discriminating separation systems, which was equipped with prominent consecutive permeability as well as excellent selectivity.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xin Zhang,Yukai Lin,Lingchao Zhang,Zhenguo Huang,Limei Yang,Zhenglong Li,Yaxiong Yang,Mingxia Gao,Wenping Sun,Hongge Pan,Yongfeng Liu
Sodium alanate, NaAlH 4 , has great potential as a hydrogen carrier but suffers from sluggish kinetics and poor reversibility caused by high energy barriers. Transition metal-based catalysts are especially effective in reducing kinetic energy barriers for hydrogen cycling of NaAlH 4 . Herein, we demonstrate a facile fabrication of TiC nanoparticles with 2–4 nm in size supported on carbon (nano-TiC@C). The resultant product consists of approximately 49.2 wt% of TiC and 50.8 wt% of C, and exhibits high and stable catalytic activity for hydrogen storage process of NaAlH 4 . The 7 wt% nano-TiC@C-containing NaAlH 4 releases 5 wt% H 2 starting from 65 °C and reabsorbs all released hydrogen at 30 °C under 100 bar H 2 , outperforming NaAlH 4 modified by commercial TiC nanoparticles (∼50 nm in size). The enhancement is related to the ultrasmall size and high reactive activity of as-synthesized TiC nanoparticles. Moreover, the weak electronegativity of C prevents the formation of Na-based by-products, which are often observed in oxide and halide-containing systems. This finding sheds light on how to design and synthesize high-performance catalytic additives for light-metal hydride-based hydrogen storage materials.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Jabrane Jouha,Fengli Li,Hai Xiong
Due to their distinctive physical, chemical, electrical, and optical properties as well as their prospective uses, 2D covalent organic framework (COF) have attracted much attention. Herein, TaTPA-COF was effectively synthesized from the condensation of TTA and TFPA using a facile solvothermal method and characterized by SEM image, FT-IR spectra, and PXRD pattern. The generated bulk TaTPA-COF materials combined with DNA aptamers are utilized as the acceptor (quencher) for the highly sensitive and selective detection of adenosine 5′-triphosphate (ATP) and thrombin, with a novel fluorescence biosensing platform and a proof-of-concept application.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Jianbo Xiong,Jiali Chen,Yu Han,Jianguo Ma,Shujuan Liu,Zhenzhen Xu,Xiaoting Liu,Xiaolan Tong,Jianqiang Luo
Uranium extraction from environment is not only conducive to the sustainable development of the nuclear energy industry but also significant to the remediation of radioactive contamination. Herein, effective adsorption sites for uranium extraction were introduced via the in situ growth of cobalt vanadate porous nanospheres on the graphene oxide (GO) layer (GO@Co 2 VO 4 PNSs). Uranium adsorption capacity of the GO@Co 2 VO 4 PNSs composite promoted significantly with 221.6% promotion compare to the pristine single GO and 80.8% promotion to the pristine Co 2 VO 4 PNSs. The adsorption efficiency also enhanced distinctively to the single components of either GO or Co 2 VO 4 PNSs at a wide pH value span from 3 to 6. The reusability efficiency kept at 89.94% even after five cycles of adsorption-desorption. XPS measurements and DFT calculations reveal that the adsorption affinity mainly originated from the oxygens of the cobalt vanadate porous nanospheres . What's more, the GO@Co 2 VO 4 PNSs composite show effective uranium adsorption under a wide pH range, which paved the real application in the spent fuel disposal. The outstanding adsorption capacity, reliable reusability, and excellent removal efficiency further provide a theoretical guidance and potential application for environmental uranium-pollution remediation.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Bingke Zhang,Dongbo Wang,Jiamu Cao,Chenchen Zhao,Jingwen Pan,Donghao Liu,Sihang Liu,Zhi Zeng,Tianyuan Chen,Gang Liu,Shujie Jiao,Zhikun Xu,Yuewu Huang,Liancheng Zhao,Jinzhong Wang
The construction of heterojunction photocatalysts is an effective method to improve photocatalytic efficiency since the potential gradient and built-in electron field established at the junction could enhance the efficiency of charge separation and interfacial charge transfer. Nevertheless, heterojunction photocatalysts with strong built-in electron fields remain difficult to build since the two adjacent constitutes must be satisfied with an appropriate band alignment, redox potential, and carrier concentration gradient. Here, an efficient charge transfer-induced doping strategy is proposed to enhance the heterojunction built-in electron field for stable and efficient photocatalytic performance. Carrier transfer tests show that the rectification ratio of the n-TiO2–X/n-BiOI heterojunction is significantly enhanced after being coated with graphene oxide (GO). Consequently, both the hydrogen production and photodegradation performance of the GO composite heterojunction are considerably enhanced compared with pure TiO2–X, BiOI, and n-TiO2–X/n-BiOI. This work provides a facile method to prepare heterojunction photocatalysts with a high catalytic activity.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shiqi Zhang,Peidong Ling,Yi Chen,Jun Liu,Chun Yang
Herein, 2D/2D porous Co 3 O 4 nanosheets/rGO composites modified GCE (Co 3 O 4 /rGO/GCE) were proposed for electrochemical detection of tryptophan (Trp). The surface morphology and structure of Co 3 O 4 /rGO nanosheets were carried out using SEM, XRD , and Raman spectra . Electrochemical performance of Trp on as-synthesized modified electrodes were discussed by CV and EIS techniques. Moreover, the best electrochemical property was also investigated by varying test condition detailedly. Consequently, oxidation peak intensity and current density were 130.3 μA and 336.7 μA·cm −2 on Co 3 O 4 /rGO/GCE at working potential of 0.78 V ( vs. SCE electrode), respectively. They were more than 23-times greater than these on bare GCE in electrochemical detection of Trp. It was attributed to the synergy effect of 2D porous Co 3 O 4 nanosheets (high catalytic activity) and 2D rGO nanosheets (large electrochemical active area). After the optimization, wide linear determination ranges (from 1.0 to 800 μM) and low LOD of 0.26 μM (S/N = 3) were acquired. In addition, these electrodes were further successfully applied to the determination of Trp in commercial amino acid injection samples. This 2D porous Co 3 O 4 /rGO modified GCE sensor could provide a slight view on the design of 2D/2D composite materials with high electrochemical properties.
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ENERGY & FUELS
·
2023
·
IF 5.3
Tao Feng,Yufan Mo,Shuo Lv,Gang Liu
Integrating polyaniline (PANI) with two-dimensional (2D) nanostructures is a promising strategy to improve electrochemical performance. In this work, 2D laminar van der Waals heterostructures of graphene and WS2 nanosheets were prepared for the enhancement of the supercapacitive performance of PANI. With well-dispersed graphene/WS2 nanosheet hybrids (G-LS/WS2-LS) as deposition supports, the in situ polymerization of aniline delivered a ternary nanocomposite PANI/G-LS/WS2-LS. Benefiting from the good electrical conductivity and chemical stability of graphene, as well as the high redox activity of WS2, the ternary nanocomposite (PANI/G-LS/WS2-LS) exhibited significantly enhanced electrochemical performance as compared with PANI. Typically, a high specific capacitance of 421.5 F/g was delivered at a current density of 1 A/g in a three-electrode system, which is more than 1.5 times that of PANI (274.1 F/g at 1 A/g). Additionally, the symmetric supercapacitor based on PANI/G-LS/WS2-LS showed good electrochemical stability with a 71.6% capacitance retention after 10,000 cycles at 5 A/g and a high specific energy of 9.96 W h/kg at a specific power of 250.04 W/kg. The study provides a facile approach to boost the electrochemical performance of conductive polymers for efficient and reliable energy storage.
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