ENERGY & FUELS
·
2019
·
IF 3.021
Yanliang Song,Xiaoyou Shi,Xue Yang,Xu Zhang,Tianwei Tan
A successive organic solvent fractionation was reported in this work to obtain lignin fractions with narrow molecular weight distribution and high purity from p-toluenesulfonic acid-extracted lignin. A decrease was found in PDI of fractionated lignin compared with parent substrate from 3.31 to 1.44 and the amount of carbohydrate derivates was detected to decline implying an increase of purity. Calculated from the results of DTG, thermal stability of lignin samples was enhanced through successive fractionation, and TG data showed that the mass of remaining char over 500 °C decreases from 51% of initial lignin to 25% of fractionated ones. There was also a decline of glass transition temperature (Tg) determined, from 142.5 to 100.8 °C. Lignin fractions that were dissolved in ethanol and acetone possessed high contents of summed aliphatic and phenolic hydroxyls might due to formation of numerous hydrogen bonds. As shown in 1H–13C HSQC NMR spectra, lignin fractions dissolving in ethyl acetate contained more C–C bonds, mainly β–β, compared with other samples.
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JOURNAL OF ORGANIC CHEMISTRY
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2021
·
IF 4.354
Ming Li,Jun-Yang Tao,Liang-Neng Wang,Jia-Wei Li,Yue-Jin Liu,Ming-Hua Zeng
Modification of commercially available biaryl monophosphine ligands via ruthenium(II)-catalyzed P(III)-directed-catalyzed ortho C–H secondary alkylation is described. The use of highly ring-strained norbornene as a secondary alkylating reagent is the key to this transformation. A series of highly bulky ligands with a norbornyl group were obtained in excellent yields. The modified ligands with secondary alkyl group outperformed common substituted phosphines in the Suzuki–Miyaura cross-coupling reaction at a ppm mole level of Pd catalyst.
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CHEMOSPHERE
·
2019
·
IF 5.108
Yusi Tian,Minghua Zhou,Yuwei Pan,Jingju Cai,Gengbo Ren
Pre-magnetized Fe 0 (Pre-Fe 0 ) was for the first time applied as heterogeneous catalyst to enhance the oxidation efficiency of electro-Fenton (EF) for the degradation of p -nitrophenol (PNP). The parameters including current, initial pH and pre-Fe 0 dosage of Pre-Fe 0 /EF process were optimized and compared with other two processes (conventional Fe 0 /EF and electro-oxidation) to confirm its advantage. The rate constants of PNP removal were 1.40–3.82 folds of those by Fe 0 /EF process under various experimental conditions. The application of pre-Fe 0 as catalyst could extend the working pH range from 3.0 to neutral conditions for PNP removal and reduce the Fe 0 dosage from 2 to 0.5 mM corresponding to Fe 0 /EF, avoiding the second pollution of iron sludge . The superiority of Pre-Fe 0 /EF process was also verified to improve the degradation and mineralization of other phenols and antibiotics. Furthermore, a possible pathway of PNP degradation was revealed by the identification of intermediates and organic acids, and the possible mechanism of pre-Fe 0 efficiently enhanced the EF efficiency was proposed. This work demonstrated that such a novel heterogeneous EF process using pre-Fe 0 catalyst was clean and promising for the degradation of refractory organic pollutants .
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Catalysts
·
2021
·Vol. 11
·期 12
·1550
·
IF 4.146
Hongzhou Dong,Yingjie Chen,Chong Gong,Lina Sui,Qiong Sun,Kangle Lv,Lifeng Dong
Due to slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during discharging and charging processes, it is essential to rationally design and synthesize non-precious metal bifunctional electrocatalysts with good performance for metal-air batteries. Herein, Ag-MnFe2O4heterojunction nanoparticles supported on N, S, P-codoped graphene (NSPG) are developed with enhanced ORR and OER bifunctional electrocatalytic activities and stability. In contrast, S, P-doped graphene (SPG) and N, P-doped graphene (NPG) show less stabilization for the heterojunction particles. For example, under alkaline conditions, the ORR half-wave potential of Ag-MnFe2O4/NSPG can reach 0.831 V, and the over potential for OER is 0.56 V at the current density 10 mA·cm−2. Furthermore, Ag-MnFe2O4/NSPG shows better methanol resistance and durability than Pt/C catalysts.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52918
·
IF 3.057
Yukun Tian,Yongzhi Hong,Yunlong Wang,Yuan Tian,Zhihao Wang,Meixing Ai,Jun Ma
The emerging stretchable and tough hydrogels find their extraordinary contributions in widespread use. However, the applicability of existing tough hydrogels in harsh environments like highly acidic stomachs has remained a challenge. Here, we develop superior stretchable and tough P(AA -co- AAm)/SiO 2 hybrid hydrogels through radiation-induced polymerization and crosslinking in the presence of acids. The performance of the nanocomposite gels was optimized by altering fabrication variables including acid concentration, monomer composition and absorbed dose. The mechanic tests show that the protonated hybrid hydrogels displayed a high elongation at break (1919%), fracture strength (117 kPa), and compressive strength at 50% strain (126 kPa). These values are superior to those of conventional polyelectrolyte hydrogels and expect to significantly broaden the application. The proposed strategy is quite general and offers an alternative strategy to develop tough hydrogels.
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INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Jianming Liu,Yao Feng,Juanjuan Yin,Tifeng Jiao
In this work, a new composite nanomaterial prepared by hydrothermal synthesis, it not only offers a convenient and stable method, but beneficial for the stable of nanomaterials. The obtained composite was explored use CNT-COOH and CuCl2, after deal with ultrasound and magnetic stirring then transferred to Teflon-lined stainless-steel autoclave for reaction. CNT-COOH not only increases the mechanical strength of the composite, but also provides a growth site of Cu nanocrystalline. The final production has a shorter reaction time for reducing 4-nitrophenol with NaBH4 than other products and has a high utilization rate. Studies have shown that the preparation of excellent nanocomposite has the potential for catalytic degradation.
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TENSIDE SURFACTANTS DETERGENTS
·
2021
·Vol. 58
·期 5
·342-352
·
IF 1.049
Haiyan Gao,Yue Zhou,Jianguo Wang,Hujun Xu
A temperature-sensitive hair dye was prepared with a poloxamer-sodium alginate mixture. When the hair dye was applied to the hair (< 32 °C), it retained its flow dynamics. The hair dye was able to undergo a phase change and formed a solid as soon as it touched the scalp (32°C), which reduced the transdermal amount of p -phenylenediamine (PPD) and also adverse effects and toxicity. Compared to a conventional hair dye, the temperature-sensitive hair dye achieved a reduction of the transdermal amount of p -phenylenediamine by almost 65% at different concentrations. At the same time, the colouring effect was not significantly reduced. The poloxamer alginate hydrogel can be used as a novel colouring material to reduce the harm of the dye intermediate to the human body when colouring hair.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Li Gong,Kai Lan,Xiang Wang,Xiaokang Huang,Pengbo Jiang,Kaizhi Wang,Ming Yang,Lei Ma,Rong Li
Exploration of noble-metal-free, highly-efficient and durable catalysts for Hydrogen evolution reaction (HER) remains a challenge. In this work, the development of carbon-coated cobalt-molybdenum-phosphide nanosheets supported on carbon cloth (Co-Mo-P@C) is successfully demonstrated. To obtain a better electrocatalystic performance, the different amount of glucose was added into the reaction system during hydrothermal process. Benefiting from the 2D structure, high electrical conductivity and sufficient active sites, the Co-Mo-P@C contained 0.5 mmol glucose exhibits relatively good catalytic activity for HER with low over poentials at −96 mV and −162 mV @ 10 mA cm −2 in acidic and alkaline medias respectively and the Tafel slope of 52.9 mV dec −1 and 34.3 mV dec −1 . Additionally, the catalyst also shows good durability in the both electrolytes.
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Advanced Science
·
2020
·Vol. 7
·期 16
·2001013
·
IF 15.84
Kai Shen,Yu Zhang,Xiaoqing Wang,Chizhu Ou,Fei Guo,Hongbing Zhu,Cong Liu,Yanyan Gao,Ruud E. I. Schropp,Zhiqiang Li,Xianhu Liu,Yaohua Mai
Environmentally benign and potentially cost-effective Sb 2 Se 3 solar cells have drawn much attention by continuously achieving new efficiency records. This article reports a compatible strategy to enhance the efficiency of planar n–i–p Sb 2 Se 3 solar cells through Sb 2 Se 3 surface modification and an architecture with oriented 1D van der Waals material, trigonal selenium (t-Se). A seed layer assisted successive close spaced sublimation (CSS) is developed to fabricate highly crystalline Sb 2 Se 3 absorbers. It is found that the Sb 2 Se 3 absorber exhibits a Se-deficient surface and negative surface band bending. Reactive Se is innovatively introduced to compensate the surface Se deficiency and form an (101) oriented 1D t-Se interlayer. The p-type t-Se layer promotes a favored band alignment and band bending at the Sb 2 Se 3 /t-Se interface, and functionally works as a surface passivation and hole transport material, which significantly suppresses interface recombination and enhances carrier extraction efficiency. An efficiency of 7.45% is obtained in a planar Sb 2 Se 3 solar cell in superstrate n–i–p configuration, which is the highest efficiency for planar Sb 2 Se 3 solar cells prepared by CSS. The all-inorganic Sb 2 Se 3 solar cell with t-Se shows superb stability, retaining ≈98% of the initial efficiency after 40 days storage in open air without encapsulation.
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MATERIALS SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.7
Qingyu Cai,Shishun Ye,Haiyang Sun,Yalin Liao,Hui Chen
The heteroatom-doped graphene has attracted a lot of research due to its excellent physical, chemical and electrochemical properties considered to be the most promising electrocatalytic material for oxygen reduction reaction (ORR). Multi-doping can exert the synergistic effect between different doped heteroatoms and effectively improve the catalytic activity of doped graphene catalysts. N, P, S tri-doped graphene catalysts were prepared by simple and convenient hydrothermal and high-temperature treatment. The experimental results show that different phosphorus sources have a significant impact on the structure and performance of the prepared catalyst materials. The NSP-Gr-1 catalyst shows the high onset potential (1.035 V), half-wave potential (0.79 V) and limiting current density (−5.33 mA cm−2) for ORR. The power density of the zinc-air battery assembled with the NSP-Gr-1 catalyst achieves 163.1 mW cm−2 at 186.7 mA cm−2, which is much higher than the maximum power density of 140.0 mW cm−2 at 190 mA cm−2 for commercial Pt/C. The discharge stability under different current densities is outstanding.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Xu Chenyang,Wang Hongxin,Guo Hongying,Liang Ke,Zhang Yuanming,Li Weicong,Chen Junze,Lee Jae Sung,Zhang Hemin
Developing transparent and efficient photoanodes is a challenging but essential task in tandem photoelectrochemical cell for unassisted solar water splitting without an external bias. Here we report construction of p–n homojunction hematite photoanodes by hybrid microwave annealing-induced single antimony doping, which results in the gradually-increased valence states from the surface to the inside by the unique features of hybrid microwave annealing. The Sb-doped p–n homojunction hematite photoanode exhibits improved performance and displays a good transparency, achieving a stable photocurrent density of ~4.21 mA cm −2 at 1.23 V RHE under 100 mW cm −2 solar irradiation, which is comparable to the reported state-of-the-art hematite photoanodes. More importantly, a parallel-connected stack of six photoanodes of transparent p–n homojunction records a near-theoretical photocurrent density of ~10 mA cm –2 at 1.23 V RHE under standard photoelectrochemical water splitting conditions, which serves as a useful reference for hematite photoanodes and promises its practical application for unbiased photoelectrochemical water splitting.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Zeming Gu,Qi Wang,Xiaoqin Sun,Lingwei Lu,Yuwei Zhang,Ran Wang,Shu Jin,Yinlin Shao,Jun Qian,Xiaoxiang Xu
P-type semiconductivity has been observed in solid solution series (SrTiO 3 ) 1- x (CaCr 0.5 Nb 0.5 O 3 ) x (0.0 ≤ x ≤ 0.15), which all adopt cubic symmetry and own intense absorption in the visible light region. These solid solutions are superior H 2 evolution photocatalysts under visible light illumination (λ ≥ 400 nm). An AQE as high as 1.02 % at 420 ± 20 nm has been achieved at optimal composition (SrTiO 3 ) 0.85 (CaCr 0.5 Nb 0.5 O 3 ) 0.15 which significantly surpasses the parent compounds. Stoichiometric H 2 /O 2 production under visible light illumination has been successfully realized using Z-scheme system containing (SrTiO 3 ) 0.85 (CaCr 0.5 Nb 0.5 O 3 ) 0.15 , WO 3 and I − /IO 3 − redox couple.
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