INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Xiaoming Liu,Yinchu Zhang,Hongwei Wang,Jiajun Yan,Liushui Yan,Kexin Li,Huiqin Guo,Wang Gong,Jun Lin
In this work, a series of Zn x Cd 1-x S solid solutions are firstly prepared by a solvothermal process. The optimized composition of Zn x Cd 1-x S solid solution is determined to be Zn 0·2 Cd 0.8 S. On this basis, the Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst with a binary p-n heterojunction has been synthesized by a co-precipitation process followed by a solvothermal method . Owning to the synergistic effect of the heterojunction structure in the interface of Cu 7 S 4 (p-type) and Zn 0·2 Cd 0·8 S (n-type) and the built-in electric field in binary p-n heterojunction, the as-prepared Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst exhibits a significantly improved photocatalytic activity toward hydrogen production from water with visible light response, which is approximately 5.0 times and 16.5 times higher than of pristine Zn 0·2 Cd 0·8 S and CdS, respectively. The possible photocatalytic mechanism has been proposed basing on a series of experimental results. The current work might be valuable inspirations for designing highly efficient heterojunction composite photocatalyst for solar hydrogen evolution .
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ENERGY & FUELS
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2022
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IF 4.654
Xing Yin,Junjie Shao,Wenbiao Zhang,Qingsheng Gao
Cost-efficient electrocatalysts derived from earth-abundant resources are urgently demanded for sustainable hydrogen production from water electrolysis. Here, biomass kapok fibers (KFs) are introduced to fabricate Mo2C@N, P co-doped carbon (Mo2C@NPC) core@shell electrocatalysts that are highly active for acidic and alkaline hydrogen evolution reaction (HER). After facile prestabilization in the presence of (NH4)2HPO4 and subsequent carbonization under an inert flow, naturally available kapok fibers convert to hollow carbon microtubes with N, P co-doping, which afterward serve as the self-template and support to obtain ultrafine Mo2C nanoparticles encapsulated by N, P co-doped carbon shells. Such shells not only boost the HER performance due to the optimized electronic configuration and the promoted conductivity but also protect Mo2C from corrosive electrolytes and result in satisfactory long-term durability. In 1.0 M HClO4 and 1.0 M KOH, Mo2C@NPC exhibits excellent performance among recently reported electrocatalysts free from noble metals, featured by low overpotentials of 127 and 155 mV at the current density of −10 mA cm–2 and the Tafel slope of 63 and 64 mV dec–1, respectively. The long-term durability of Mo2C@NPC can be confirmed by both accelerated degeneration and chronoamperometric tests. Elucidating efficient electrocatalysis on biomass-derived nanomaterials, this work will inspire further exploration of efficient electrocatalysts.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 33
·期 10
·3490-3500
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IF 3.348
Wu Zhang,Weikang Xia,Yasheng Shi,Changlin Zhou,Ran Chen,Lei Wang,Jinqing Qu
Flame-retarded epoxy thermosets are highly desirable for electronics-related basic materials in the new-generation information applications. Herein, a DOPO-anchored benzothiadiazole flame retardant, namely DOPO-BTD , is designed and synthesized for P/N/S synergistic flame-retarded epoxy thermosets. DOPO-BTD possesses good thermal stability and excellent compatibility with the epoxy matrix. As reflected by UL 94 test, the DOPO-BTD coated EP passes the V0 rating and achieves a higher LOI value of 34.6% at ultralow P content of 0.39 wt%. The investigation of the DOPO-BTD -triggered P/N/S synergistic flame-retarded effect by thermal images further validated the flame retarded efficacy and dramatic inhibition of the flame. Meanwhile, the incorporation of 4.8 wt% DOPO-BTD into the epoxy matrix, the PHRR, THR, SPR, TSP, and COP are significantly decreased by 37.97%, 27.44%, 25.49%, 19.83%, and 31.70%, respectively. Additionally, the fire growth index (FGI) is sharply dropped 26.06%. Moreover, the TGIR and TGMS results convince the flame-retarded mechanism of DOPO-BTD through the combination of the gas-phase and condensed-phase pathways. The P/N/S synergistic DOPO-BTD can serve as a promising flame retardant for efficiently fabricating the flame-retarded epoxy thermosets, and this study sheds light on the development of multiple elements synergistic flame-retardants for functional polymers with great application potential.
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NATURAL PRODUCT RESEARCH
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2022
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IF 2.488
Xin Liu,Zhihong Cheng
Euphorbia factor L1 (EFL1, 1) is a natural tri-ester of 6,17-epoxylathyrol with cancer multidrug resistance (MDR) reversal activity. Several EFL1 derivatives (2–9) were prepared by chemical and microbial transformations and their ability to inhibit P-glycoprotein (P-gp) activity was estimated. Six de-acylated derivatives (2–7) were obtained through base-hydrolysis of 1, and the base-catalysed hydrolysis via KOH and NaOH yielded different hydrolysed products of 1. Two biotransformed products (8–9) were directly obtained via microbial transformation of 1, and 8 was also formed by microbial conversion of the hydrolysed product 3. The P-gp modulation of 1–9 was assessed by a zebrafish model. The substrate 1 and its biotransformed product 9 as the tri-esters of lathyranes possessed the highest P-gp inhibitory activity with IC50 values of 34.97 and 15.50 µM, respectively, through down-regulating P-gp expression at the protein level rather than at MDR1 mRNA level.
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高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Yu Liu,Yingying Xing,Xinyu Zheng,Shengjie Xu,Di Li,Deli Jiang
Designing high-performance and earth-abundant bifunctional catalysts for electrocatalytic water splitting remains a great challenge. Herein, a novel electrode composed of Cr-doped Co 2 P with P vacancies nanowire arrays (denoted as CrCo 2 P(V p ) NWs) grown on nickel foam was fabricated via a hydrothermal and successive calcination method. The Cr doping and vacancy engineering synergistically enable the exposure of more active sites, optimize electronic structure, and accelerate the charge transport capability, thus enhancing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances. As a result, the obtained Cr 0.4 Co 2 P(V p ) NWs catalyst exhibits superior catalytic activities in 1.0 M KOH solution with low overpotentials of 37 mV at −10 mA cm −2 for HER and 253 mV at 20 mA cm −2 for OER, respectively. Furthermore, using Cr 0.4 Co 2 P(V p ) NWs as a dual-function catalyst only requires 1.54 V voltage at 10 mA cm −2 for overall water splitting. Notably, the Cr 0.4 Co 2 P(V p ) NWs catalyst displays satisfactory stability with only a small attenuation of 3.2% after 50 h in a constant current testing. This study highlights the synergistic effect between doping and anion-vacancies in the enhancement of electrocatalytic activities and provides a feasible strategy to design effective, earth-abundant, and stable bifunctional electrocatalysts for water splitting.
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APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Xianwei Li,Shuangxiu Ma,Fang Luo,Zehui Yang
Electrochemical hydrogenerations of nitrogen and oxygen molecules are of significance for nitrogen reduction and oxygen reduction reactions. Strengthening the binding between active sites and gaseous molecules is beneficial for enhancing the catalytic performance, especially in NRR catalysis. In this work, we have engineered the oxygen vacancies in Co 3 O 4 nanoparticles to boost the catalytic activity towards NRR and ORR. Ascribing to the p-d hybridization between Co and N atoms, N 2 electrochemical adsorption is promoted and the related energy barrier of N 2 protonation is significantly decreased by 50%; as a consequence, Faradaic efficiency is 11.2% at −0.4 V vs. RHE, 3-fold higher than Co 3 O 4 /CNT; moreover, due to the oxygen vacancies in Co 3 O 4-x /CNT leading to a higher oxophilicity, Co 3 O 4-x /CNT showed a better selectivity in ORR catalysis and kinetic current density at 0.85 V vs. RHE is boosted by 2.4 times. Consequently, Co 3 O 4-x /CNT exhibits a better rechargeable zinc air battery performance than Pt/C-IrO 2 by a factor of 2.2.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Zhengjun Qu,Xiaoshen Xu,Hongfei Ren,Ting Sun,Lihui Huang,Zhenhui Gao
Clay-based composite materials have been widely used for environmental remediation due to their excellent physicochemical properties , however, there are few studies on clay-based composite materials as ozone catalyst carriers. In this study, Ce-loaded sepiolite (Ce/SEP) catalyst was synthesized using an impregnation-calcination method. Ce/SEP catalysts had a higher efficiency for heterogeneous catalytic ozonation than sepiolite alone. Among different mass ratios of Ce element to sepiolite (5 % Ce/SEP, 7 % Ce/SEP, 10 % Ce/SEP, and 15 % Ce/SEP), 10 % Ce/SEP showed the best catalytic performance with the mineralization efficiency of p-nitrophenol (PNP) as 71 % that was 1.15, 1.08, and 1.18 times higher than that of 5 % Ce/SEP, 7 % Ce/SEP, and 15 % Ce/SEP, and increased by 30 % compared to that of the ozonation alone. Larger surface area and abundance of strong acid sites of Ce/SEP favored adsorption of ozone molecules on the catalyst surface. High content of oxygen vacancies in the catalyst promoted Ce 3+ /Ce 4+ cycling and subsequently a superior catalytic activity of the Ce/SEP catalyst. In addition, free radical quenching experiments as well as electron spin resonance analysis indicated that hydroxyl radical (∙OH) was the main contributor to the mineralization of PNP in this system. This study provides a novel strategy for the heterogeneous catalytic ozonation of refractory organic pollutants in water.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 19
·2200320
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IF 5.006
Lin Xu,Yu Fu,Robert J. Wagner,Xiang Zou,Qingrui He,Tao Li,Wenlong Pan,Jianning Ding,Franck J. Vernerey
Hydrogels containing thermosensitive polymers such as poly( N -isopropylacrylamide) (P(NIPAm)) may contract during heating and show great promise in fields ranging from soft robotics to thermosensitive biosensors. However, these gels often exhibit low stiffness, tensile strength, and mechanical toughness, limiting their applicability. Through copolymerization of P(NIPAm) with poly(Acrylic acid) (P(AAc)) and introduction of ferric ions (Fe 3+ ) that coordinate with functional groups along the P(AAc) chains, here a thermoresponsive hydrogel with enhanced mechanical extensibility, strength, and toughness is introduced. Using both experimentation and constitutive modeling, it is found that increasing the ratio of m(AAc):m(NIPAm) in the prepolymer decreases strength and toughness but improves extensibility. In contrast, increasing Fe 3+ concentration generally improves strength and toughness with little decrease in extensibility. Due to reversible coordination of the Fe 3+ bonds, these gels display excellent recovery of mechanical strength during cyclic loading and self-healing ability. While thermosensitive contraction imbued by the underlying P(NIPAm) decreases slightly with increased Fe 3+ concentration, the temperature transition range is widened and shifted upward toward that of human body temperature (between 30 and 40 °C), perhaps rendering these gels suitable as in vivo biosensors. Finally, these gels display excellent adsorptive properties with a variety of materials, rendering them possible candidates in adhesive applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Chuanbai Yu,Tao Wu,Feihao Yang,Heng Wang,Wenhui Rao,Hai-Bo Zhao
Nano flame retardants , as one of the key flame retardants in recent years, have been limited by poor efficiency and weak compatibility. In this study, we propose an interfacial hollow engineering strategy to tackle this problem by assembling P-phytic acid into the hollow cavity of mesoporous SiO 2 grafted with a polydopamine transition metal. In this design, the grafted polydopamine-metal coatings on the hybrids can greatly improve their interface compatibility with the polymer matrix, while the loaded phytic acid in the cavity contributes to enhance flame retardancy. Consequently, the resultant hierarchical P-loaded nanohybrids show both high flame retardancy and mechanical reinforcement for the polymer. Taking epoxy resin (EP, a typical thermosetting resin used in large quantities) as a representative, at only 1 wt% loading of the nanohybrids, the impact strength of the nanocomposites improved by 35.7% compared to pure EP. Remarkably, the hybrids can simultaneously endow EP with high flame retardancy (low heat release rate) and satisfactory smoke inhibition. Additionally, the flame-retardant mechanism analysis confirmed that the nanohybrid had a better catalytic carbonization effect on promoting the highly graphitized carbon layer, thereby suppressing the fire hazard of epoxy resins. This research offers a new interfacial hollow engineering method for the construct and design of high-performance EP with nanohybrids.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 25
·12229-12236
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IF 3.925
Lin Yang,Jingxian Wang,Anchang Li,Honghai Liu,Ming Zhang,Zhongrong Shen
Porous carbon has attracted great interest as an anode for lithium-ion capacitors (LICs) due to its high lithium-ion storage capacity. However, its low electrical conductivity and tap density are major challenges facing its commercialization. In this study, a low-cost Fe3C@N-doped C material has been synthesized via the polymerization and carbonization of the natural biomass material sodium alginate (SA) and commercial p-Phenylenediamine (PPD). FeCl3 is used as both a crosslinking agent and catalyst to promote the PPD oxidation reaction and the degree of carbonization. The as-obtained graphite-like Fe3C@N-doped C with a carbonization treatment at 700 °C exhibits both high Fe and N contents of 3.93 wt% and 5.34 wt%, respectively, and a high electrical conductivity equivalent to graphite, which would be favorable for lithium-ion storage due to the synergistic effect of the high electrical conductivity and pseudocapacitive characteristics. Moreover, the Fe3C@N-doped C exhibits a superior lithium-ion storage capacity of 566.0 mA h g−1, higher than that of commercial graphite, and a high tap density of 0.59 g cm−3. As the negative electrode for an LIC, the capacitor delivers a high specific energy of 86.6 W h kg−1 at a current density of 0.1 A g−1. Meanwhile, good cyclability has also been achieved for the cell. The superior electrochemical properties of the LICs could be attributed to the high lithium-ion storage capacity and good cycling stability of the Fe3C@N-doped C material.
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CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Zhufeng Hu,Yinxiang Xu,Wenchao Xiang,Xiaodong Guo,Yuchen Tong,Junbo Xu,Chao Yang
The oxygen evolution reaction (OER) is the key to prepare electrocatalysts for water splitting. Heteroatom doping is an effective way to improve the catalytic performance of OER by modulating the local electronic environment and stimulating the synergy. However, the complicated manufacturing methods have hindered their practical application. Herein, we demonstrate a method based on FeOOH/CC precursor to realize the preparation of Ni-P-S@FeOOH/CC catalyst through fast electrodeposition method. The overpotential of Ni-P-S@FeOOH/CC catalyst is 210 mV (10 mA cm −2 ), and still has an initial voltage of 97.35 % for 48 h. The surface area analysis shows a higher electrochemically active surface area for the amorphous structure prepared by electrodeposition method. XPS and DFT results show that the co-doping of P and S can stimulate the synergistic effect and the minimum energy of adsorption/desorption in OER process is only 0.83 eV. The strategy shows good prospects for preparing efficient OER pre-catalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
He Guo,Hao Yang,Jingwen Huang,Jie Tong,Xueying Liu,Yawen Wang,Weichuan Qiao,Jiangang Han
This paper aims to investigate plasma-catalytic degradation of p-nitrophenol (PNP) with graphene-ZnO nanoparticles based on theoretical and experimental perspects. The graphene-ZnO nanoparticles were firstly prepared by hydrothermal process, which were then systematically characterized with scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectrum, UV–Vis spectrophotometer, X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption desorption analyzer. Combined with the analysis of Discrete Fourier Transform (DFT), the morphology, structure, specific surface area, absorption light range and electron transfer of the prepared catalyst are described in detail. The prepared graphene-ZnO nanocomposites displayed larger specific surface area and wider light absorption range. The charge could be transferred from ZnO to graphene. The catalytic degradation performace was further examined. Results indicated that degradation rate of PNP was enhanced from 68.5% to 80.2% with ZnO, which could futher improved to 97.6% with graphene (6%)-ZnO nanocomposites. The prepared samples exhibited good stability. Active species including OH, O 2 – , HO 2 , 1 O 2 , h + and e - played crucial role in PNP degradation. The degradation pathways were proposed based on DFT calculation and relevant literatures. Lastly, ECOSAR algorithm illustrated that the toxicity of PNP can be relieved after plasma-catalytic treatment.
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