CELLULOSE
·
2020
·Vol. 27
·期 7
·4043-4052
·
IF 4.21
Wang Binshou,Shen Peiyan,Zhu Wenyuan,Pang Zhiqiang,Dong Cuihua
Size reduction of biomass is an energy-extensive operation for biorefinery, and fundamentals of size effect on biomass fractionation is pressing to be unraveled. Herein, we investigated effect of ground wood particle size on properties of biomass fractionation using p -toluenesulfonic acid ( p -TsOH) treatment. Both carbohydrates and lignin dissolution increased with smaller ground wood particle size. Comparatively, delignification performance was much affected by ground wood particle size, and the percentage of lignin dissolution was dramatically enhanced at small ground wood particle size. The excellent delignification selectivity was warranted at small ground wood particle size accordingly. In addition, mechanism of ground wood particle size effect on lignin dissolution was proposed. On one hand, dissolution of lignin by p -TsOH primarily was an aggregation effect, and diffusion of lignin from the microfibril network in biomass became growingly troublesome at large size. On the other hand, depolymerization of lignin mainly occurred in the liquid phase, which essentially led to production of large p -TsOH-lignin aggregates with low diffusivity.
研究领域:
生物化学
·
可再生资源工程
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DOI
高影响因子
OZONE-SCIENCE & ENGINEERING
·
2021
·
IF 2.562
Xiaojie Fu,Yuanxing Huang,Yaowei Wang,Manli Liang,Ya Yang,Zhihao Jin,Junhao Yang,Shouxun Hu,Liang Li
Catalyst of Fe–Co-layered double hydroxide (LDH) prepared by co-precipitation could effectively improve the degradation of pharmaceutical intermediate – p-toluenesulfonic acid (p-TSA) in the water during ozonation. The experimental results showed that under the condition of pH 7.9, catalyst dosage 0.1 g/L and aqueous ozone concentration 6.2 mg/L, 20 mg/L of p-TSA obtained a TOC removal percentage of 85%. To search for the mechanism of Fe–Co LDH catalytic ozonation and degradation of organic pollutants, hydroxyl radicals were measured with dimethyl sulfoxide (DMSO) and high-performance liquid chromatography (HPLC). The existence of hydroxyl radicals in catalytic ozonation system was also indirectly detected by observing the influence of quenching agents of HCO3− and PO43- on the p-TSA removal. Furthermore, we used electron paramagnetic resonance (EPR) to directly detect the hydroxyl radicals generated during the catalytic ozonation of p-TSA. The experiment results fundamentally revealed the mechanism of catalytic ozonation to degrade organic pollutants.
研究领域:
环境化学
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水处理技术
·
高级氧化工艺
·
催化
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Zhaoxiang Zhang,Shaoqi Li,Shilun Gao,Yiyang Pan,Xinyuan Shan,Hao Feng,Dandan Yang,Huabin Yang
Tin/phosphide (Sn/P) based alloys have been regarded as one of the promising anodes for advanced sodium-ion batteries due to their advantages of low-cost and proper redox potentials to Na/Na + . However, because of the serious volume expansion in the Na storage process, Sn/P-based materials generally suffer from rapid capacity decay during the cycle. Herein, a novel tin/phosphorus@graphite-carbon nanotubes (Sn/P@G-CNTs) composite was synthesized via a rational high-energy ball milling (HEBM) method. SEM and TEM results reveal that the separated Sn/P species are homogeneously dispersed in the G-CNTs matrix, which can accommodate large volume expansion and generate good electrical contact during cycle. As a result, the fabricated Sn/P@G-CNTs electrode exhibits a high reversible capacity (1048 mA h g −1 after 100 cycles at 100 mA g −1 ) with an initial Coulombic efficiency of 79.84% and good rate capability, better than those of Sn/P@G and Sn/P@CNTs counterparts. The design strategy and synthesis method of Sn/P@G-CNTs can provide an insight on constructing cost-effective sodium-ion batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Hongxiang Chen,Sheng Li,Jun Deng,Zhilong Zhang,Jianeng Huang,Fa Chang,Li Huang,Shixuan Du,Pinqiang Dai
321 phases are an atypical series of MAX phases, in which A = As/P, with superior elastic properties, featuring in the MA-triangular-prism bilayers in the crystal structure. Until now, besides Nb 3 As 2 C, the pure phases of the other 321 compounds have not been realized, hampering the study of their intrinsic properties. Here, molten-salt sintering (MSS) and solid-state synthesis (SSS) were applied to synthesize As/P-containing 321 phases and 211 phases. Analyzing the phase composition of the end-product via multiple-phase Rietveld refinement, we found that MSS can effectively improve the purity of P-containing MAX phases, with the phase content up to 99% in Nb 3 P 2 C and 75.4(5)% in Nb 2 PC. In contrast, MSS performed poorly on As-containing MAX phases, only 8.9(4)% for Nb 3 As 2 C and 64(2)% for Nb 2 AsC, as opposed to the pure phases obtained by SSS. The experimental analyses combined with first-principles calculations reveal that the dominant formation route of Nb 3 P 2 C is through NbP + Nb + C → Nb 3 P 2 C. Moreover, we found that the benefits of MSS on P-containing MAX phases are on the facilitation of three considered chemical reaction routes, especially on Nb 2 PC + NbP → Nb 3 P 2 C. Furthermore, the intrinsic physical properties and Fermi surface topology of two 321 phases consisting of electron, hole, and open orbits are revealed theoretically and experimentally, in which the electron carriers are dominant in electrical transport. The feasible synthesis methods and the formation mechanism are instructive to obtain high-purity As/P-containing MAX phases and explore new MAX phases. Meanwhile, the intrinsic physical properties will give great support for future applications on 321 phases.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Dan Xu,Pengcheng Jian,Weijie Liu,Shizhou Tan,Yiming Yang,Meng Peng,Jiangnan Dai,Changqing Chen,Feng Wu
Modulating the electrical properties of two-dimensional (2D) materials is a fundamental prerequisite for their development to advanced electronic and optoelectronic devices. Substitutional doping has been demonstrated as an effective method for tuning the band structure in monolayer 2D materials. Here, we demonstrate a facile selective-area growth of vanadium-doped molybdenum disulfide (V-doped MoS2) flakes via pre-patterned vanadium-metal-assisted chemical vapor deposition (CVD). Optical microscopy characterization revealed the presence of flake arrays. Transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were employed to identify the chemical composition and crystalline structure of as-grown flakes. Electrical measurements indicated a light p-type conduction behavior in monolayer V-doped MoS2. Furthermore, the response time of phototransistors based on V-doped MoS2 monolayers exhibited a remarkable capability of 3 ms, representing approximately 3 orders of magnitude faster response than that observed in pure MoS2 phototransistors. This work hereby provides a feasible approach to doping of 2D materials, promising a scalable pathway for the integration of these materials into emerging electronic and optoelectronic devices.
研究领域:
材料科学
·
纳米电子学
·
光电子学
·
二维材料
·
半导体掺杂
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DOI
高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Wenxin Wang,Shikun Chen,Xin Chen,Hao Qian,Yajun Zhang,Yi Liu,Dongming Yan
In this study, Mg–P coatings, prepared on steel alloy substrates, were exposed to temperature from 25 °C to 900 °C. The effects of high temperature exposure and the salt spray test on the anti-corrosion ability of Mg–P coating were investigated in detailed. The results show that the corrosion resistance of coatings decreases continuously from 25 °C to 700 °C, then increases at 900 °C of exposure. However, the corrosion resistance of coatings after 2000h salt spray test was significantly improved. In particular, the corrosion rate of the coating is only one-ninth that of the coating before the salt spray test when the temperature is 900 °C. Furthermore, the microscopic characterization test revealed that a dense oxide layer form between the steel alloy substrate and the coating when temperature exceed 400 °C. Besides the crystal phase transition and oxide layer , the synergistic effect of the secondary reaction of the raw material is the key factor to ensure that the coating still has good corrosion resistance at a high temperature.
研究领域:
材料科学
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腐蚀工程
·
表面涂层
·
高温材料
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 41
·51218
·
IF 3.125
Di Bao,Fei Xu,Yexiang Cui,Sicheng Yuan,Xiguang Zhang,Yanji Zhu,Yueyang Gao,Huaiyuan Wang
High loadings of fillers are usually needed to achieve high-thermal conductivity (TC) of polymer-based composites, which inevitably sacrifices processability and meanwhile causes high-cost. Therefore, it is of great significance to achieve high-TC composites under low-filler loading. Here, a novel p-phenylenediamine (PPD) modified expanded graphite (EG-PPD)/epoxy (EP) composite with high TC and low-filler content was successfully prepared via pre-dispersion and vacuum assisted mixing strategy. With the improved interfacial compatibility between EG and EP by PPD, the prepared EG-PPD/EP composite exhibited excellent thermal management performance, resulting in the TC of which reached 4.00 W·m −1 ·K −1 with only 10 wt% (5.59 vol%) of EG-PPD, which is approximately 19 times higher than that of pure EP. Meantime, the interface thermal resistance of EG-PPD/EP composite between EG-PPD and EP is reduced by 33% compared with EG/EP composite. This composite with excellent TC property is expected to be used in thermal management field.
研究领域:
材料科学
·
聚合物复合材料
·
热管理
·
纳米复合材料
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DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 6
·1393-1398
·
IF 5.976
Shengbin Nie,Ao Liu,You Meng,Byoungchul Shin,Guoxia Liu,Fukai Shan
In this study, transparent p-type CuCrxOy semiconductor thin films were fabricated using spin coating and integrated as channel layers in thin-film transistors (TFTs). The structural, morphological components, and optical properties of CuCrxOy thin films, together with device performance, were systematically investigated. The phase conversion from a mixture of CuCr2O4 and CuO to pure CuCrO2 was achieved when the annealing temperature (Ta) was higher than 700 °C. The electrical performance of the CuCrxOy TFTs on SiO2 dielectric is improved with increasing Ta from 500 °C to 800 °C. The optimized CuCrO2 TFT exhibits an on/off current ratio of ∼105 and a hole mobility of 0.59 cm2 V−1 s−1, which is much better than those previous works on solution-processed binary CuxO TFTs. To our best knowledge, this work demonstrates the ternary p-type CuCrO2 TFTs fabricated via a low-cost solution process for the first time, which represents an important advancement towards the development of all-oxide, low-cost p–n junctions and CMOS logic circuits.
研究领域:
材料科学
·
半导体器件
·
薄膜技术
·
电子学
·
纳米技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9665-9672
·
IF 10.733
Kanghua Li,Siyu Wang,Chao Chen,Rokas Kondrotas,Manchen Hu,Shuaicheng Lu,Chong Wang,Wei Chen,Jiang Tang
Sb2Se3 is a promising non-toxic, Earth-abundant, stable thin-film solar cell absorber material. However, the low built-in potential caused by the low intrinsic doping density (∼1013 cm−3) and the low carrier collection efficiency due to the low carrier mobility (∼1.5 cm2 V−1 s−1) hinder further efficiency improvement of Sb2Se3 solar cells. Therefore, an effective hole-transport layer (HTL) is necessary to further boost the built-in potential and assist carrier collection. Herein we attempt to improve the efficiency of Sb2Se3 solar cells by using CuSCN as an HTL. CuSCN as an HTL suppresses the back surface recombination, and enhances the built-in potential and carrier collection efficiency. Meanwhile, materials and physical properties characterization reveals that CuSCN provides Cu ions which induce grain boundary inversion, and therefore separate photo-generated carriers more efficiently. Consequently, we obtained a device efficiency of 7.50%.
研究领域:
光伏技术
·
材料科学
·
半导体器件
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DOI
高影响因子
Systems Microbiology and Biomanufacturing
·
2023
·
IF 0
Zhang Landong,Gao Changzheng,Song Wei,Wei Wanqing,Gao Cong,Chen Xiulai,Liu Jia,Liu Liming,Wu Jing
D -p -hydroxyphenylglycine (D-HPG) is an important intermediate in the pharmaceutical industry, and it is commonly synthesized by cascading D-hydantoinase (DHase) and D-carbamoylase (DCase). In this study, the stability of DCase was identified as the main problem that limits its application. Therefore, the complexed structure of Ak DCase (DCase from the Agrobacterium sp . strain KNK712) with the substrate N-carbamoyl-D- p -hydroxyphenylglycine (C p HPG) (with 2.52 Å resolution) and catalytic mechanism were resolved. Based on the catalytic mechanism and electrostatic stabilization, salt bridge engineering was adopted to improve Ak DCase thermostability. The best variant, Ak DCase D30A , increased the T m by 2.91 °C and half-life (t 1/2 ) at 40 and 60 °C by 18.43 h and 23.21 min, respectively. After Ak DCase D30A was assembled with Gs DHase (DHase from Geobacillus stearothermophilus SD-1) in a single Escherichia coli cell, the recombinant strain could produce 29.53 g/L D-HPG within 12 h, with a 97% conversion and a 2.46 g/(L·h) space–time yield (STY). The titer of D-HPG increased by 40.55% compared to the E. coli cell harboring pETduet-1- Ak DCase- Gs DHase. The recombinant strain could be used for two cycles. Our research provides a basis for the industrial production of D-HPG.
研究领域:
生物催化
·
蛋白质工程
·
工业微生物学
·
结构生物学
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DOI
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Jun-Fei Shen,Sheng-Nan Hu,Na Tian,Meng-Ying Li,Shuang-Li Yang,Si-Yi Tian,Ming-Shu Chen,Zhi-You Zhou,Shi-Gang Sun
Highly active and durable electrocatalysts for the cathodic oxygen reduction reaction (ORR) are vital for the large-scale commercialization of proton exchange membrane fuel cells. Alloying Pt with transition metals is a promising method to enhance the ORR catalytic activity, but the leaching of transition metals is inevitable, which deteriorates the stability. Here, we report the design of a P-doped PtCo electrocatalyst supported on carbon via a facile one-pot hydrothermal method. On the one hand, the introduction of P into the carbon support by phytic acid can enhance the anchoring ability of the PtCo alloy and inhibit the migration of nanoparticles. On the other hand, the doping of P into the lattice of the PtCo alloy further tunes the electronic effect, which improves activity and stability simultaneously. The mass activity of as-prepared P5-PtCo/C at 0.9 V can reach 0.72 A mgPt–1, which is 4.5 times higher than that of commercial Pt/C. After an accelerated durability test (ADT) of 30,000 potential cycles, the mass activity only decreased by 9.4%. Meanwhile, the average particle size of the catalyst slightly increased from 4.94 to 5.15 nm after the ADT of 70,000 potential cycles. This study provides a facile approach for constructing nonmetal-doped PtM catalysts with improved durability for the ORR.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
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DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2021
·
IF 0.782
Xiao-Yun He
A novel and convenient approach to the synthesis of various tertiary phosphine oxides via nickel-catalyzed cross-coupling of (het)aromatic tosylates with secondary phosphine oxides is developed. The reaction employs cheap nickel as the catalyst, 1-(2-(di-tert-butylphosphanyl)phenyl)-4-methoxypiperidine (L3) as the ligand, and pyridine as the base. This reaction produces the corresponding (het)aromatic phosphorus compounds in good to high yields. Moreover, four new tertiary phosphine oxides are reported in this process.
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DOI
高影响因子
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