CELLULOSE
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2020
·Vol. 27
·期 13
·7591-7605
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IF 4.21
Wang Haiyong,Hu Xiaohong,Liu Siwei,Cai Chiliu,Zhu Changhui,Xin Haosheng,Xiu Zhongxun,Wang Chenguang,Liu Qiying,Zhang Qi,Zhang Xinghua,Ma Longlong
The bi-functional Ni–W@C catalysts were prepared by one-pot reduction–carbonization method and used in hydrogenolysis of cellulose as well as raw lignocellulosic biomass to chemicals. The catalytic performance for cellulose conversion showed that it was more favorable for ethylene glycol (EG) production, obtaining the highest EG yield 60.1% over the Ni–W@C 700 catalyst. The Ni–W@C bimetallic catalysts are systematically characterized with BET, XRD, Raman, XPS, TEM techniques and experiments to probe the active catalytic sites of the catalysts. The effects of calcination temperature of Ni–W catalysts, reaction time, temperature and H 2 pressure on cellulose hydrogenolysis were investigated in detail. The Ni particles could lead to produce more W 5+ active sites, which promotes the glucose retro-aldol condensation to break the target C–C bonds. Metallic Ni catalyzed C=O hydrogenation and C–C hydrogenolysis, which could also avoid the coke formation. The EG selectivity was dependent on the synergy of WO x and Ni metal sites. In addition, this synergistic effect between the metal and WO x could promote lignin component degradation in direct conversion of untreated raw lignocellulosic biomass, obtaining the propyl monophenolics including guaiacylpropane, syringylpropane and p-n-propylphenol with a total yield of 17.3 wt% besides EG.
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JOURNAL OF RARE EARTHS
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2020
·
IF 3.104
Weili Li,Qi Wang,Lei Wang,Xian-Zhu Fu,Jing-Li Luo
The development of direct methanol fuel cells (DMFCs) is partially limited by the poor kinetics of methanol oxidation reaction (MOR) at the anode side. It was reported that the interaction between Pt and CeO 2 enhances the electrocatalytic performance of Pt catalyst for MOR. In this work, a hybrid material (CeO 2 –C) composed of CeO 2 and carbon was successfully prepared by a simple hydrothermal method followed by calcination in inert atmosphere . The hierarchically porous nanostructure and especially good electronic conductivity of CeO 2 –C make it an excellent support for Pt particles for application in electrocatalytic process. TEM investigation reveals that triple-phase interface of Pt, carbon and CeO 2 forms in Pt/CeO 2 –C catalyst. Performance of the as-prepared catalyst for MOR was studied in alkaline medium. The Pt/CeO 2 –C catalyst shows superior catalytic performance for MOR compared with Pt/CeO 2 and the physical mixture of Pt/CeO 2 and acetylene black (Pt/CeO 2 +C). The significantly improved performance can be attributed to the synergetic effect between Pt particles and CeO 2 –C support, and the better conductivity of CeO 2 –C. This study provides a possible method to expand the application potential of CeO 2 materials in MOR, and may also be used in other electrocatalytic process.
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Feihui Li,Jingkuo Zhou,Chunjuan Gao,Haixia Qiu,Yunlan Gong,Jinghan Gao,Yu Liu,Jianping Gao
In the present work, magnetically recyclable Bi/Bi 25 FeO 40 -C nanocomposites were synthesized through a one-step hydrothermal approach and then analyzed. The analysis results manifested that non-toxic and biodegradable sodium alginate takes a key role in successful preparation of Bi/Bi 25 FeO 40 -C. Sodium alginate can totally suppresses the formation of BiFeO 3 because it changes the alkalinity of the medium, and at the same time Fe precursor greatly restrains the reduction of Bi 3+ to Bi by sodium alginate, so the final product is Bi/Bi 25 FeO 40 with a small amount of Bi instead of Bi, BiFeO 3 or Bi/BiFeO 3 . Bi/Bi 25 FeO 40 -C showed enhanced photocatalytic activity in hydrogen generation as compared with pure Bi 25 FeO 40 due to the surface plasmonic resonance effect of Bi and electron conductivity of carbon, which promote electron-hole separation and light absorption of the Bi/Bi 25 FeO 40 -C, resulting in high photocatalytic efficiency. The Bi/Bi 25 FeO 40 -C even exhibited higher catalytic efficiency than noble metallic nanoparticles and good reusability in p-nitrophenol reduction. This work provides a green way to prepare Bi/Bi 25 FeO 40 -C for catalytic reactions.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Qiulan Zhang,Zhi Zhu,Yongnian Ni
Foods generally contain special ingredients which easily to interact with drugs human intaking, thus affecting drug efficacy and excretion, and even cause adverse reactions. Vitamin C (Vit. C) is abundant in fresh fruits and vegetables. It plays a regulatory role in redox metabolism, and its absence can cause scurvy. Aspirin (ASP) can be used to treat many diseases, is the earliest, common and widely used as antipyretic, analgesic and antirheumatic medicine. Human serum albumin (HSA) is the most abundant protein in vertebrate plasma and has the property of combining and transporting endogenous and exogenous substances. In this paper, the effects of Vit. C on the combination of ASP and HSA were studied by multi-spectra and voltammetric approaches. Fluorescence spectra showed that the quenching mode between Vit. C and HSA is dynamic, and the main binding force is hydrophobic force . The quenching mode between ASP and HSA is static one, and the main binding force is hydrogen bond and van der Waals force . For ternary biological system of (HSA–ASP)–Vit. C, the binding constant decreases compared with HSA–Vit. C system. However, for (HSA–Vit. C)–ASP system, the binding constant does not change when compared with binary system of HSA–ASP. Based on the technology combination of voltammetry , infrared, three-dimensional fluorescence and circular dichroism (CD), it is proved that the existence of ASP will influence the binding process of Vit. C to HSA. It could be concluded that taking Vit. C first doesn't affect the absorption of ASP and may be good for health; in contrast, it is not good to take Vit. C immediately as one have just taken ASP, because the existence of ASP reduce the absorption of Vit. C for human body.
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高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 6
·1034
·
IF 4.324
Qing Liu,Shihang Zhang,Yan Xu
In this study, the dense cloud-like structured CuS nanoparticles were successfully prepared using a simple two-step hydrothermal method. The experimental temperature was the most important factor that affected the microstructure and surface functions of CuS/C. Therefore, the CuS/C electrodes were synthesized at different temperatures (80 °C, 120 °C, and 160 °C). Subsequently, their crystallographic phase and morphologies as well as the structure of the as-prepared electrodes were analyzed in detail. The electrode prepared at 120 °C (CuS/C-120) was determined to have a perfect microstructure, high specific capacitance, and good rate performance. To further improve the electrochemical performance of this electrode, it was combined with polyaniline (PANI) to obtain a CuS/C-120@PANI electrode via the cyclic voltammetric electrodeposition method. The CuS/C-120@PANI electrode exhibits a specific capacitance of 425.53 Fg−1at a current density of 1 Ag−1and a good cycling stability of 89.86% after 3000 cycles. The perfect architecture of CuS/C-120@PANI maximizes the synergistic effect between its different components and provides abundant electrochemically reactive sites, promoting the diffusion and transfer of electrolyte ions during the electrochemical reaction processes. Detailed analysis shows that the CuS/C-120@PANI electrode has great potential for use in high-performance energy storage devices.Keywords:CuS/C-120@PANI;nanocomposites;supercapacitor;electrode material
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Rumeng Wang,Dongjin Feng,Tianhua Chen,Shimou Chen,Yuwen Liu
In this paper, we report a mussel-inspired polydopamine coating on the Si/C electrode via a simple immersion process to improve the electrochemical performance such as cycle stability and rate capability. The nanometer-thick polydopamine coating layer enables fast Li + transport at the interfaces and takes part in the formation of SEI due to the electron-rich amine group. The PD coated Si/C electrode exhibits good performance in long cycling test. Compare with the uncoated Si/C electrode, the capacity retention of the coated electrode is improved from 59.5% to 80% after 200 cycles. X-ray photoelectron spectroscopy, transmission electron microscopy and scanning electron microscopy prove that PD coating really promotes the formation of uniform and dense SEI and reduces cracks on the electrode surface. Meanwhile, the pulverization of electrodes which breaks the electrical contact with the current collector is alleviated.
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ANALYTICA CHIMICA ACTA
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2020
·
IF 5.977
Xiaobin Zhou,Mengke Wang,Junyang Chen,Xiaolei Xie,Xingguang Su
Single atom nanozymes are the artificial enzymes with enzyme-like activity, which have attracted a great deal attention in recent years due to their unique merits such as remarkable stability, excellent atom utilization and low cost. Herein, a convenient and sensitive colorimetric strategy was developed for the sensing of galactose based on Fe–N–C single-atom nanozyme (Fe-SAzyme). The Fe-SAzyme was prepared through “isolation-pyrolysis” method that exhibited intrinsic peroxidase mimicking activity, which can quickly catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue-colored oxTMB in the presence of hydrogen peroxide (H 2 O 2 ). Galactose can be oxidized by galactose oxidase (Gal Ox) to generate H 2 O 2 , and Fe-SAzyme can be utilized for quantitative colorimetric detection of galactose. A good linearity between absorbance and the galactose concentration in the range of 50–500 μM was obtained with a detection limit of (LOD) 10 μM. The Fe-SAzyme based colorimetric strategy offered a rapid, convenient and economic way for galactose quantification detection, which could be used as an alternative method for galactosemia diagnosis.
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RSC Advances
·
2020
·Vol. 10
·期 16
·9723-9729
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IF 3.119
Yuchan Ma,Jiao Yang,Tong Yang,Yan Deng,Mengqiao Gu,Min Wang,Rong Hu,Yunhui Yang
C-reactive protein (CRP) has become a recognized indicator of inflammation. CRP concentration in serum is an important indicator for monitoring early heart damage, and it is also a newly discovered coronary heart disease-associated inflammatory factor. A conductive nano-hybrid material composed of Au NPs and ionic liquid functionalized molybdenum disulfide (Au NPs/IL-MoS2) was prepared and utilized to immobilize primary CRP antibodies. Subsequently, 1,5-diaminonaphthalene (DN) was adsorbed onto graphene oxide (GO) through π–π stacking, which was used to load iridium nanoparticles (Ir NPs) as a tag to label secondary CRP antibodies. The large surface area of Au NPs/IL-MoS2 and the excellent electrocatalytic properties of Ir NPs/GO-DN toward the reduction of H2O2 resulted in a highly sensitive assay for CRP antigens. This immunosensor exhibited wide linear ranges from 0.01 to 100 ng mL−1 and a lower detection of limit of 3.3 pg mL−1 (S/N = 3). This CRP immunosensor can be applied in real serum sample analysis with satisfactory results, indicating that the immunosensor has potential applications in biomedical detection.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-16
·
IF 12.264
Deng Baiwen,Xiang Zhen,Xiong Juan,Liu Zhicheng,Yu Lunzhou,Lu Wei
Sandwich-like laminated Fe&TiO 2 @C nanocomposites were successfully prepared from the MXene–MOFs hybrids.
A broad effective bandwidth of 6.5 GHz at a thickness of only 1.6 mm was achieved.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395401
·
IF 3.551
Peng Zhang,Yang Liu,Min Zhou,Yuxiong Xue,Xianghua Zeng,Junlei Qi,Minghua Chen,Fenglian Sun
Nanostructured transition metal sulfides are promising anode materials for lithium-ion batteries. Nevertheless, it is still a great challenge to prepare capacity-improved electrodes without reducing their rate capability and cycle stability. In this paper, we present a C/Co9S8@SnS2 composite material by loading SnS2 nanocrystals onto MOF-derived C/Co9S8 nanostructures. The C/Co9S8@SnS2 composite has multiple active sites to store lithium ions. The specific capacity reaches 3.1 mAh cm−2 when the current density is 0.224 mA cm−2. The asynchronous electrochemical reaction between Co9S8 and SnS2 offsets the volume expansion of the anode material. Meanwhile, the compact adhesion of carbon layers on the interfaces suppresses the destruction of the anode during the charging–discharging processes. Consequently, the synthesized electrode presents favorable capacity with high current density or under long-term cycling conditions. The prepared battery has a reversible specific capacity of 0.452 mAh cm−2 and a coulomb efficiency of 99.7% after 500 cycles with a high current density of 2.24 mA cm−2. The research results obtained in this work provides a feasible strategy to improve the performance of electrodes systematically.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Mingliang Ma,Wenting Li,Zhouyu Tong,Yong Ma,Yuxin Bi,Zijian Liao,Jian Zhou,Guanglei Wu,Mingxia Li,Jiewei Yue,Xinyu Song,Xinyue Zhang
One-dimensional (1D) ZnFe 2 O 4 @SiO 2 (ZS) nanochains were prepared with Stöber method under external magnetic field. Then, 1D ZS nanochains were covered with a uniform polydopamine (PDA) shell, and the pyrolysis process was completed to obtain 1D ZnFe 2 O 4 @SiO 2 @C (ZSC) nanochains. Finally, 1D flower-like ZnFe 2 O 4 @SiO 2 @C@NiCo 2 O 4 (ZSCNC) nanochains were fabricated through a simple hydrothermal method. The carbon layer with strong dielectric loss enabled the 1D ZSC nanochains to achieve an ultra-wide effective absorption bandwidth (EAB) of 6.22 GHz. Compared with the above nanochains, the 1D ZSCNC nanochains showed more excellent microwave absorption (MA) properties because of the unique 1D flower-like architectures having large surfaces and multiple interfaces. The sample loaded with 30 wt% 1D flower-like ZSCNC nanochains showed strong MA performances with a minimum reflection loss (RL) value of −54.29 dB (11.14 GHz) and an EAB of 5.66 GHz (11.94–17.60 GHz) at the thickness of 2.39 mm. The 1D flower-like ZSCNC nanochains with strong absorption, broad absorption bandwidth (almost the entire Ku band) and thin layer has a good application prospect for the absorption of electromagnetic waves in Ku band.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Zhenyu Zhao,Zuoyi Xiao,Yaru Xi,Guoxiang Wang,Youchen Zhang,Jiajun Li,Li Wei
Manufacturing heteroatom-doped porous C with controllable N species is an important issue for supercapacitors. Herein, we report a low-cost and simplified strategy for synthesizing B,N-codoped porous C (BNPC) by a freeze-drying chitosan–boric acid aerogel beads and subsequent carbonization treatment. The BNPC samples were studied using various characterization technologies. The introduction of boric acid to chitosan successfully induced the formation of B,N-codoped C with a well-developed 3D interconnected porous structure. The B doping had a significant impact on the distribution of N species in the samples. Moreover, the good wettability of the sample resulting from B doping is favorable for electrolyte diffusion and ion transport. As a consequence, the optimal BNPC sample showed an excellent specific capacitance of 240 F g–1 at 0.5 A g–1 and an outstanding capacitance retention of 95.1% after 10000 cycles at 5 A g–1. An assembled symmetrical supercapacitor displayed an energy density of 11.4 Wh kg–1 at a power density of 250 W kg–1. The proposed work provides a simple and effective method to obtain B,N-codoped C-based materials with high electrochemical performance.
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