Journal of Energy Storage
·
2023
·
IF 9.4
Haidong Xie,Chunping Hou,Zeyu Yue,Lidong Zhai,Hehang Sun,Hui Lu,Jiandong Wu,Shaolin Yang,Yong Ma
SiO x has high specific capacity for lithium-ion batteries, but the rate and the cycling performances need to be further improved to satisfy the needs of the future. In this study, the C, N, P doping SiO x /G@CNP anodes are prepared by a facile ball milling and heat treatment process . The electrochemical performances of SiO x are improved by the synergistic effect of C, N, P doping. The SiO x /G@CNP-2 anode with the addition of 20 wt% phytate shows the best electrochemical performances and maintains a specific capacity of 77.45% after 150 cycles at 0.2 A·g −1 . Importantly, it exhibits a remarkable rate performance with specific capacities of 528.2 mAh·g −1 and 370.0 mAh·g −1 even at 3.0 and 5.0 A·g −1 , respectively. Artificial graphite and the carbon shell formed by the thermal decomposition of citric acid contribute to the structural stability of SiO x and improve the cycling performance of the material. Moreover, the addition of P element and high content of pyridine N accelerates the rate of Li + deintercalation, and the conductivity and ion diffusion coefficient of the material are effectively promoted, thus greatly improving the rate performance of the material. This work presented herein provides a simple and feasible method for the preparation of high-performance anode materials.
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高影响因子
POLYMER INTERNATIONAL
·
2023
·Vol. 72
·期 7
·664-670
·
IF 3.2
Bin Li,Mengjing Zhou,Xiaojia Xu,Jizhen Liu,Wenrui Hao,Aolin Wu
Choline chloride, acrylamide (AM) and acrylic acid (AA) were used as raw materials to prepare deep eutectic solvent, and β-cyclodextrin (β-CD) was used as filler to prepare β-CD/P(AM- co -AA) composite hydrogel by frontal polymerization. The composite hydrogel was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The pH response, mechanical properties and self-healing of the hydrogel were studied. The results show that AA contains easily ionized –COOH, which makes the composite hydrogel have excellent pH response and super-high swelling ratio under alkaline conditions. With the addition of β-CD, due to the increase of hydrogen bonds and the combination of β-CD and polymer chains the mechanical properties of the hydrogel are obviously improved and the tensile strength and compressive strength are increased by 4.12 and 2.26 times respectively. The introduction of β-CD can improve the self-healing performance of the composite hydrogel. With the increase of β-CD content, the healing rate and healing speed of the composite hydrogel show an upward trend. In this study, a simpler and faster method is proposed to prepare self-healing composite hydrogel with excellent mechanical properties and pH responsiveness. The self-healing property and the existence of a hydrophobic cavity of β-CD make β-CD/P(AM- co -AA) composite hydrogel have potential application in wound healing. © 2023 Society of Industrial Chemistry.
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JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Yue Shen,Chun Chen,Zidan Zou,Zhi Hu,Zhen Fu,Wenchao Li,Shenglong Pan,Yunxia Zhang,Haimin Zhang,Zhixin Yu,Huijun Zhao,Guozhong Wang
Exploring the interactions among doping heteroatom, carbon and metal atoms has great potential to significantly enhance the catalytic performance and can gain an insightful understanding of the heterogeneous catalysis mechanism. Here, we present an N,P co-doped carbon-coated cobalt (Co@NPC) as a highly selective and water-durable catalyst applicable to aqueous-phase hydrogenation of cinnamaldehyde, featuring a precise control of products by adjusting N and P doping. These di-heteroatoms display a synergistic effect of geometry and electrons in Co@NPC, thus can selectively reduce C O to produce unsaturated alcohols. In contrast, Co@NC without P doping is highly active, but shows significant productivity of saturated alcohols under equivalent conditions. Theoretical calculations manifest that the electronegativity difference among N, C and P atoms leads to the interaction between electrons, thus can adjust the chemical states of the active metal and enhance the catalytic performance in hydrogenation. It provides a desirable way for regulating the catalysis of heterogeneous catalysts.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Dechan Lu,Rongyuan Cai,Yuqin Liao,Ruiyun You,Yudong Lu
Abnormal uric acid (UA) content in body fluids can fully reflect the status of metabolism and immunity in the body. We have developed a simple, efficient and label-free surface enhanced Raman scattering (SERS) method for UA detection. Briefly, p-aminothiophenol (p-ATP) was used as the internal standard molecule and linking molecule to prepare a glass/p-ATP/Ag NPs SERS substrate. The Raman characteristic peak of p-ATP at 1076 cm −1 can be used as an internal standard molecule to correct the signal fluctuation of UA detection. The results show that the SERS method owns a linear response with a ranging from 5 × 10 -6 to 10 -3 M of UA characteristic peak of both 693 cm −1 and 493 cm −1 with a determination coefficient (R 2 ) of 0.9878 and 0.9649, respectively. Additionally, the SERS sensor has been further used for the analysis of UA in sweat and good recoveries were obtained for the sensing of sweat. We believe that the developed SERS substrate has potential for applications in healthcare monitoring.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jinwei Tian,Yu Cui,Lele Zhang,Chao Peng,Xiangfei He,Liang Chen,Yulin Bai,Chunli Guo,Yuede Pan,Gang Li,Yanzhen Liu,Han Chen
The cruising range of lithium batteries in new energy vehicles became main issue, so lithium-sulfur batteries (LSBs) with high theoretical energy density are becoming great expectations. However, the polysulfide-shuttle behavior and slow redox kinetics of the electrochemical processes result in a fast capacity and cycle life fade in LSBs, especially at high sulfur loads. In this paper, MoP nanoparticles were dispersed on P, N co-doped graphitic nanosheets (MoP/PNC) by one-step high-temperature phosphating method, which as a separator-modified material achieved an excellent electrochemical performance. The initial discharge specific capacity can reach 1470 mAh g −1 at a current density of 0.2C and the capacity attenuation per cycle in 600 cycles is only 0.074% (1C). Surprisingly, LSBs with MoP/PNC -modified separator can deliver a high area capacity of 9.30 mAh cm −2 with a sulfur loading up to 7.43 mg cm −2 on the positive electrode. The above-mentioned excellent electrochemical performances benefited from the synergistic effects of strong catalytic conversion ability of MoP and the physical/chemical adsorption and catalytic capability of PNC, which resulted in low polysulfide permeability and high sulfur utilization.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xiaoyu Zhong,Linyang Li,Wenhao Xiang,Chuanbao Xiao,Nianbing Zhong,Quanhua Xie,Dengjie Zhong,Yunlan Xu,Haixing Chang,Shih-Hsin Ho
Herein, a highly stable and efficient photoelectrocatalytic system was developed for the rapid degradation of tetracycline . The photoelectrocatalytic system comprised two Ag/N-doped TiO 2 nanotube photoanodes, a bipolar membrane, and a P–Pd cathode. The Ag/N-doped TiO 2 nanotube photoanodes were coupled with a P–Pd cathode to enhance the hydroxyl free radical (·OH) generation at the cathode surface. The bipolar membrane can separate tetracycline pollutants and degradation products from the photoanodes, which can minimize the contamination of the photocatalyst by tetracycline or products, thereby enhancing the repeatability and stability of the photoelectrocatalytic system. photoelectrocatalytic uses ultraviolet–visible light as the input energy for the effective removal of tetracycline and total organic carbon . The initial pH in the cathode and photoanode chambers was 7.0. The Na 2 SO 4 concentration in the photoanode chamber and the addition amount of H 2 O 2 were 0.2 M and 4% (v/v), respectively. Under these conditions, 100 mL of 100 mg/L tetracycline was completely degraded within 60 min, and 82.3% total organic carbon was removed within 5 h. The pseudo-first-order reaction rate constant of the Ag/N-doped TiO 2 nanotube with 0.15 M Ag was 0.0637 min-1, which was 12 times higher than that of N-doped TiO 2 nanotube. The mechanisms underlying·OH generation and the tetracycline degradation pathway were also elucidated. The photoelectrocatalytic system, which is an eco-friendly and low-energy system, exhibits excellent stability and reliability toward tetracycline and total organic carbon degradation and significantly aids the development of wastewater remediation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junjie Fu,Afei Zhang,Dongxing Kou,Zewen Xiao,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
One important issue limiting the development of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is the severe recombination loss at CZTSSe/Mo(S,Se) 2 /Mo back contact, primarily arising from the non-matched potential barrier and inferior electric contact between absorber and weak n -type Mo(S,Se) 2 interfacial layer. It is expected that a p-type Mo(S,Se) 2 can effectively improve the hole extraction and enhance the device performance. In this work, we propose a plausible direction to build up an electrically benign back surface field by in-situ doping Mo(S,Se) 2 with group VB elements (TM = V, Nb and Ta). It is turned out that the generated V Mo , Nb Mo , or Ta Mo shallow acceptors could convert Mo(S,Se) 2 from weak n -type to p-type conductivity and increase its work function ( W F ) and hole concentration. With the contact of p-type absorber ( W F,absorber < W F,Mo(S,Se)₂ ), a benign ohmic contact with favorable downward band bending is formed, thereby accelerating the holes extraction and minimizing interface recombination loss. With significant gains in open-circuit voltage ( V oc ) and fill factor (FF), the Mo(S,Se) 2 :Ta device finally increases the efficiency from 10.82 % to 12.72 %. This convenient in-situ Mo(S,Se) 2 doping strategy is different from previous complicated or unstable cases and should serve as a basis for high-quality back contact engineering in kesterite photovoltaics.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 6
·1051-1057
·
IF 1.248
Dong Yanying,Yu Ping,Sun Qilong,Lu Yang,Tan Zhenjiang,Yu Xiaopeng
Effective molecularly imprinted membranes(MIMs) were developed as an efficient adsorbent for the selective removal of p -hydroxybenzoic acid( p -HB) from acetylsalicylic acid(ASA, aspirin). The MIMs were grafted successfully from poly(vinylidene fluoride) microfiltration membranes via reversible addition-fragmentation chain transfer(RAFT) polymerization. The graft copolymerization of acrylic acid(AA) in the presence of template p -hydroxybenzoic acid led to molecularly imprinted polymer(MIP) film coated membranes. The obtained MIMs were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectrophotometer(FTIR) and Raman spectra, and batch mode adsorption studies were carried out to investigate the specific adsorption equilibrium, kinetics and selective recognition properties of different MIMs. The kinetic properties of the MIMs could be well described by the pseudo-second-order rate equation. Selective permeation experiments were performed to evaluate the permeation selectivity of the p -HB imprinted membranes. The observed performances of the MIMs are applicable to the further purification of aspirin.
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Solar RRL
·
2018
·Vol. 3
·期 2
·1800274
·
IF 0
Like Huang,Shixiao Bu,Danli Zhang,Ruixiang Peng,Qiang Wei,Ziyi Ge,Jianjun Zhang
Electron transport layer (ETL)-free perovskite solar cells (PSCs) are getting much more attention with their simpler structure and potentially low cost as well as higher stability. However, the elimination of ETL (such as TiO 2 ) with intrinsically deep valance band level leads to the absence of the hole blocking mechanism and thus serious charge recombination at the FTO/perovskite interface compared with ETL-based devices. An interface band bending associated built-in electric field is an essential driving force of charge separation. Here, by intentional polarity tailoring of perovskite via incorporation of Sb as a shallow donor, ETL-free PSCs with optimized energy level alignment both at the front and rear interfaces are constructed, resulting in an enhanced built-in electric field and thus efficient majority carrier collection and minority blocking as well as reduced interfacial charge recombination at both interfaces. Device simulation calculations also confirm the importance of polarity control for device performance improvement. The effect of doping on the perovskite films properties and device performance are systematically demonstrated. Correspondingly, ETL-free PSCs with a champion power conversion efficiency of 12.62% is achieved.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Haichao Fu,Peng Zhao,Shengjun Xu,Gong Cheng,Zhuoqian Li,Yi Li,Kai Li,Shuanglong Ma
The novel Fe 3 O 4 and porous biochar originated from Myriophyllum aquaticum composites (Fe 3 O 4 /MC) with graphitized structure, hierarchical porous and strong magnetism were used as efficient catalysts for degradation of organic pollutants in the presence of peroxymonosulfate (PMS). Three types of catalysts pyrolyzed at 600, 700, 800 °C manifested quit different PMS activation effect with the much better p-hydroxybenzoic acid (HBA) degradation efficiency at 700 and 800 °C than that of 600 °C, which was assigned to the high graphitization degree and mesopores ration of catalysts pyrolyzed at higher temperature. Based on radicals quenching experiments and electron paramagnetic resonance (EPR) analyses, the radical pathway dominated by surface-bound SO 4 − was the prevailing way while the non-radical pathway performed as electro-transfer was the recessive way during the degradation process. The large amount of surface-bound SO 4 − radicals were produced through the reduction of PMS by Fe(II), which was regenerated by participation of O 2 − /O 2 . The non-radical pathway was achieved by the graphitized structure which acted as electron transfer bridges accepting electrons form organic pollutants and denoting electrons to PMS. Six HBA intermediates were detected and the possible HBA degradation pathway was proposed tentatively. Consequently, the conversion of Myriophyllum aquaticum to composite catalyst provides a brand-new idea for efficient utilization of waste biomass in a high value-added way and simultaneously achieving the contaminants elimination.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8307-8312
·
IF 1.354
Xu Peng,Chen Nannan,Lin Huan,Cen Changli,Wu Zhenguo,Xu Nanfang,Tang Jingen,Teng Zhaogang
Anchoring metal cores inside porous shells can endow metal catalyst with high selectivity and stability. Herein, multiple silver nanoparticles were successfully anchored in hollow mesoporous silica nanospheres (Ag@HMSNs) through a facile one-pot method. Polyacrylic acid aggregates self-assembled
in water/ethanol solvent were used as core templates and Ag nanoparticles captors, and hexadecyl trimethoxysilane (C16TMS) was used as the pore-making agent. The hollow cavity, encapsulated multiple Ag nanoparticles, and mesoporous silica shell of the Ag@HMSNs were confirmed by
X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and nitrogen sorption analysis. Just as expected, Ag nanoparticles (2–5 nm) were encapsulated in the cavity of hollow mesoporous silica nanospheres with the size of about 200 nm. The fabricated Ag@HMSNs showed excellent
performance for catalytic reduction of p-nitrophenol (4-NP). Also, catalytic activity of the Ag@HMSNs for 4-NP reduction was increased with the addition amount of the pore-making agents and surface areas. The superior catalytic performance was attributed to the unique structural features
of Ag@HMSNs architecture, in which the mesoporous shell provided readily accessible pathway for fast transport of reactants to the encapsulated Ag nanoparticles.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 26
·10517-10522
·
IF 3.069
Shasha Pang,Xianwen Kan
Developing an accurate and sensitive method for the detection of environmental pollutants is of great significance. However, traditional single signal based electrochemical sensors are usually susceptible to external and internal effects. To overcome these influences, in the present work, ferrocene (Fc) was covalently functionalized on multi-walled carbon nanotubes (MWNTs) to fabricate a facile electrochemical sensor for the detection of o-nitrophenol (o-NP) and p-nitrophenol (p-NP). With an increase in the concentration of both the nitrophenols, the peak currents of nitrophenols increased while the peak current of Fc remained constant. Thus, Fc can be used as an inner reference element to obtain a ratiometric signal by dividing nitrophenol current by Fc current, which endowed the sensor with a built-in correction of environmental effects. Moreover, Fc can effectively separate the reduction peaks of o-NP and p-NP, which made it possible to detect o-NP and p-NP individually and simultaneously. Due to the self-calibration based on the ratiometric strategy and the good conductivity of MWNTs, the prepared sensor showed high accuracy, reliability, and sensitivity for o-NP and p-NP detection with the linear range of 1.0 × 10−7 to 1.0 × 10−4 M. The facile, low cost, and sensitive sensor reported here has promising potential for accurate and reliable detection of other compounds.
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高影响因子
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