CHEMISTRY OF MATERIALS
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2020
·
IF 9.567
Xiaowen Zhang,Simin Liu,Dezhi Tan,Yuehui Xian,Duoduo Zhang,Zuxing Zhang,Yi Liu,Xiaofeng Liu,Jianrong Qiu
Establishing a new photonic material with large optical nonlinearity in the near-infrared regime is significant for ultrafast optical science and devices. In this paper, we developed a facile photochemical approach to fabricate covellite CuS plasmonic nanocrystals (NCs) with high chemical stability and strong oxidation resistance under ambient conditions. The photochemically derived CuS NCs possess strong absorption in the visible-to-near-infrared optical range caused by the localized surface plasmon resonance effect (LSPR). We further demonstrate superior saturable absorption behavior of CuS NCs with a large modulation depth and a high damage threshold. Using CuS as an optical switch, a highly stable mode-locked pulsed laser operating in the telecommunication band with a signal-to-noise ratio over 70 dB and a pulse duration of 1.57 ps has been achieved. Our results suggest that the photochemical method is an effective technique to fabricate plasmonic NCs, which can be developed as an excellent candidate for ultrafast photonic devices in the visible-to-near-infrared region.
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ChemPlusChem
·
2020
·Vol. 85
·期 6
·1339-1346
·
IF 2.753
Qilun Ye,Xiyan Hou,Husileng Lee,Hongzhen Liu,Liangjie Lu,Xiujuan Wu,Licheng Sun
Graphical Looks like a sea urchin : Cobalt-Copper (hydr)oxides with urchin-like nanostructure were successfully prepared. They have a high electrocatalytic activity and a relatively robust structure towards oxygen evolution reaction under alkaline conditions. The suitable Cu 2+ dopant and the anion exchange process promote the formation of high-valent active Co species. This leads to the reconstruction of the catalyst morphology and structure with a larger surface area, which is beneficial for the electrocatalytic water splitting. The development of efficient and low-cost oxygen evolution reaction (OER) catalysts is essential for the generation of clean hydrogen energy from water splitting. Herein, a novel hierarchical urchin-like cobalt-copper (hydr)oxide in situ grown on copper foam (CoCuO x H y (S)/CF) was synthesized through the electrochemical transformation of cobalt-copper sulfides (Co 9 S 8 -Cu 1.81 S) via anodization process. This CoCuO x H y (S)/CF anode exhibited a low overpotential ( η ) of 274 mV at a current density of 100 mA cm −2 with a robust durability over a period of 40 h when operated at 10 mA cm −2 . Further investigations imply that the unique nanowires aggregated urchin-like structure of CoCuO x H y (S) derived from the in situ anion exchange process could facilitate the exposure of active sites and accelerate electron transfer. More importantly, the incorporation of copper resulted in an electronic delocalization around the cobalt species, which contributed to reach a high-valent catalytically active cobalt species and further improved the OER performance.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
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IF 4.551
Shushu Huang,Dengyao Yang,Qianxi Tang,Wei Deng,Long Zhang,Ziye Jia,Zhengfang Tian,Qiang Gao,Limin Guo
In this study, the Pt-loaded ellipsoidal nanozeolite (Pt/ZSM-5-OS) was successfully synthesized by the mercaptosilane modification assisted Pt dispersion method and investigated for the catalytic combustion of toluene, which was used as a model compound of volatile organic compounds (VOCs). The catalytic activity evaluation showed that Pt/ZSM-5-OS exhibited an excellent activity in toluene catalytic combustion, with 90% conversion (T 90 ) occurring at just 164 °C. The catalytic activity was much higher than the catalyst prepared by traditional impregnation method (Pt/ZSM-5-IM, T 90 = 196 °C). In addition, the excellent properties of anti-water vapor and catalytic stability were observed for Pt/ZEM-5-OS. The as-prepared catalysts were characterized by X-ray diffraction (XRD), N 2 physisorption , scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Characterization of the as-prepared catalysts demonstrated that the enhanced catalytic performance was related to the improved Pt dispersion and higher Pt 0 proportion of Pt-ZSM-5-OS. Hence, Pt/ZSM-5-OS and its preparation method are attractive for the practical VOCs catalytic combustion.
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Nano-Micro Letters
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2020
·Vol. 12
·期 1
·1-17
·
IF 12.264
Ding Chenfeng,Liu Tianyi,Yan Xiaodong,Huang Lingbo,Ryu Seungkon,Lan Jinle,Yu Yunhua,Zhong Wei-Hong,Yang Xiaoping
An ultra-microporous carbon material simultaneously with high specific surface area (1554 m 2 g −1 ) and packing density (1.18 g cm −3 ) is designed and fabricated.
The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g −1 and 507 F cm −3 at 0.5 A g −1 ) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xiaohui Liu,Yongqiang Wang,Shaoyong Lu,Ying Liu,Bin Zhao,Beidou Xi,Xiaochun Guo,Wei Guo,Jian Zhang
This study aims to investigate the removal efficiency and mechanism of sulfamethoxazole (SMX) and fate of corresponding sul genes in an electrolysis-integrated tidal flow constructed wetland system (EC-TFCWs). Compared with the single-stage TFCWs, excellent SMX removal was obtained in EC-TFCWs (increased by nearly 20%) owing to synergistic effect of electrolysis-integrated microbial degradation and flocculation. However, SMX removal in EC-TFCWs can be affected by electrode materials with iron electrode higher removal (average removal efficiency = 81.86%) than that of graphite electrode (average removal efficiency = 77.83%). In addition, the removal efficiency of SMX increased from 65.52% to 84.23%, from 42.32% to 87.22% and from 66.33% to 91.9% with the increase of current intensity from 0.21 mA cm 2 to 1.50 m A cm 2 , hydraulic retention time (HRT) from 6 h to 48 h and electrolytic time from 2 h to 8 h, respectively. This result indicated that the current intensity, electrolytic time and HRT played an important role in SMX removal. The absolute abundance of sul genes in zeolite and effluent in EC (iron)-TFCWs was lower than that of in TFCWs at long stress of SMX. However, iron sludge can become a reservoir of sul genes. A novel EC (iron)-persulfate-integrated TFCWs was developed to further improve the performance of EC (iron)-TFCWs (increased by nearly 10%), which achieved a better removal effect and lower abundance of sul genes than that of in EC (iron)-TFCWs, and SO 4 − played a key important role.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 5
·51589
·
IF 3.125
Ben Li,Guangming Zhu,Yujia Hao,Tianning Ren
The research for self-healing epoxy vitrimers has attracted a lot of attention over the years. However, due to the special structure of the epoxy molecular chain, which limits its movement ability, epoxy vitrimers usually need to be healed under high temperature and pressure. So it is relatively difficult to healing. Here, a new type of cross-linked network is obtained by cross-linking hydrogenated bisphenol A epoxy resin and polypropylene glycol diglycidyl ether (PPGDGE) as hard and soft segments with an amine curing agent containing disulfide bonds. The addition of PPGDGE can improve the mobility of the molecular chains in the cross-linked network we designed, thereby obtaining a novel epoxy vitrimers with better healing properties. The effect of PPGDGE content on the mechanical properties and self-healing properties of the material was studied. The ideal sample HEP-3 has a good tensile strength (33.4 MPa) and a completely broken sample can achieve a good self-healing rate (71.5%) at 100°C for 3 h without high pressure. In addition, the ideal sample also has excellent shape memory properties (shape memory fixity ratio R f = 97.1%, shape recovery ratio R r = 94.9%). Moreover, due to the existence of the dynamic disulfide bond introduced by the curing agent 2-aminophenyl disulfide, compared with traditional thermosetting epoxy resins, epoxy vitrimers prepared by us can be reshaped or postprocessed like thermoplastic polymers under specific conditions. These characteristics will become the guarantee for expanding the application range of epoxy materials.
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Catalysts
·
2021
·Vol. 11
·期 9
·1079
·
IF 4.146
Song Zhou,Xi Liu,Jian Xu,Hui Zhang,Xiaosong Liu,Pengcheng Li,Xiaodong Wen,Yong Yang,Yongwang Li
As an alternative to noble metal hydrogenation catalysts, pure molybdenum carbide displays unsatisfactory catalytic activity for arene hydrogenation. Precious metals such as palladium, platinum, and gold are widely used as additives to enhance the catalytic activities of molybdenum carbide, which severely limits its potential applications in industry. In this paper, iron-promoted molybdenum carbide was prepared and characterized by various techniques, including in situ XRD, synchrotron-based XPS and TEM. while the influence of Fe addition on catalytic performance for toluene hydrogenation was also studied. The experimental data disclose that a small amount of Fe doping strongly enhances catalytic stability in toluene hydrogenation, but the catalytic performance drops rapidly with higher loading amounts of Fe.Keywords:molybdenum carbide;Fe-promoter;toluene hydrogenation;synchrotron-based XPS;in situ XRD
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Huaguo Jiang,Zeming Lu,Bin Qian,Shun Wang,Bo Yin,Yifeng Zheng,Lin Ge,Han Chen,Caizhi Zhang
Bi-doped La 1.5-x Bi x Sr 0.5 Ni 0.5 Mn 0.5 O 4+δ (LBSNM-x, x = 0, 0.05, 0.1, 0.15) was investigated as a potential air electrode for solid oxide electrolysis cell (SOEC). The effect of Bi doping on the structure, electrical conductivity , chemical compatibility with GDC electrolyte, electrochemical performance and thermal expansion coefficients (TECs) were investigated. XRD characterization results show that the solid solution content of Bi is less than or equal to 0.1. XPS characterization results indicate that Bi doping increases the oxygen vacancy content of LBSNM-x air electrode and thus greatly benefits its oxygen evolution reaction . Among the Bi-doped samples, LBSNM-0.1 electrode has the best electrochemical performance with its lowest Rp (polarization resistance) of 0.28 Ω cm 2 at 800 °C based on LBSNM-0.1/GDC half-cell. LBSNM-0.1 single cell with 70%CO 2 + 30%CO fuel gas feed on the fuel electrode has achieved current density of 811 mA cm −2 at 800 °C and 1.4 V, a 62.2% increase relative to that of LSNM single cell. In addition, LBSNM-0.1 single cell exhibits excellent stability at 800 °C and 1.3 V with 70%CO 2 + 30%CO feed gas on the fuel electrode. These results prove that Bi-doped LBSNM-0.1 is an efficient air electrode for SOEC.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 11
·6054-6063
·
IF 3.784
Xing Zhang,Cheng Liu,Liang Shi,Wenhao Xu,Hongyang Zhang,Rui Zeng,Huaiwu Zhang
Ti 4+ -modified MgZrNb 2 O 8 (MgZr 1- x Ti x Nb 2 O 8 , x = 0, 0.1, 0.2, 0.3, 0.4) ceramics were synthesized using the traditional solid-state reaction method. Pure MgZr 1– x Ti x Nb 2 O 8 was detected without any secondary phase via the X-ray diffraction patterns. According to the sintering behavior and the surface morphology results, the introduction of Ti 4+ reduced the sintering temperature and promoted the grain growth. The correlations between the dielectric properties and the crystal structure were analyzed through the Rietveld refinement and Raman spectroscopy. The slight shifts of the Raman peaks, corresponding to different vibration modes, were induced by the substitution of Ti 4+ for Zr 4+ and related to the improved quality factor. In general, the sample of MgZr 0.9 Ti 0.1 Nb 2 O 8 sintered at 1320°C for 4 h exhibited promising microwave dielectric properties with an ultra-high Q × f value of 130 123 GHz (at 7.308 GHz, 20°C), which is potential for 5G communication applications.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 35
·19466-19475
·
IF 4.22
Ding Jinjin,Zhang Mengke,Wei Xiaoqing,Song Wenwu,Wang Jin,Sun Tongming,Zhu Jinli,Wang Minmin
A rational structural strategy to design rambutan-like NiFe-LDH nanocluster arrays electrode via a buffer-salt-assisted hydrothermal method was reported. For our developed electrode, large stable current density of 100 and 200 mA cm −2 at overpotential of only 283 and 300 mV in oxygen evolution reaction in alkaline electrolyte was obtained, which is dramatically lower than many previous reported overpotentials. It also exhibits low Tafel slope at current range from 10 to 25 mA cm −2 (56.47 mV dec −1 ). Further analysis demonstrates the key role of higher carriers of the rambutan-like NiFe-LDH nanocluster arrays electrode in boosting the water-splitting performance of the resulting system. Benefiting from the fine geometry shape of the self-supported nanocluster nanoarrays electrode, the transfer process of the reactants and oxygen/hydrogen bubbles is accelerated. In addition, a 19-time enhancement of carrier concentration for our developed rambutan-like NiFe-LDH nanoclusters (2.9 × 10 29 m −3 ) is obtained. Notably, the resultant rambutan-like NiFe-LDH nanocluster arrays electrode exhibits enhanced stability (in high and low current density) for the full water splitting in 1 M KOH, remaining nearly 100% of the original current density after continued testing for 20 h. This finding may provide new insight on rational structural design LDH nanostructures with high performance for electrocatalysis. Graphic abstract A highly hydrophilic NiFe-LDH nanocluster arrays electrode is developed for efficient full water splitting. Large and stable current density of 200 mA cm −2 is obtained at overpotential of 300 mV. Besides, the faraday efficiency is nearly 100%.
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Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Yongmei Ge,Kui Wang,Huili Li,Ye Tian,Yutong Wu,Zhaowei Lin,Yangyang Lin,Yansong Wang,Jiarong Zhang,Bin Tang
Bone pain is the primary problem for patients with osteoporosis. Ketoprofen is clinically used to treat osteoporotic pain, while long-term oral administration of ketoprofen can cause some side effects. In addition, osteoporosis is also accompanied by bone mass loss and inflammation. In this study, we designed a multifunctional drug (Ket@Mg-MOF-74) adopted Mg-MOF-74 to load ketoprofen to treat osteoporotic pain, bone loss and inflammation comprehensively. Mg-MOF-74 was prepared, and the physicochemical characterization proved that it had excellent physical and chemical stability. Ket@Mg-MOF-74 was synthesized by post-synthetic modification method and a high loading rate of ketoprofen was confirmed. Drug release and ion release experiments indicated Ket@Mg-MOF-74 had a good controlled release of ketoprofen and Mg in solution. Cell experiments in vitro proved the compound drug could significantly reduce the expression of pain-related genes of cyclooxygenase 2 (COX2), obviously up-regulated the expression of osteogenic cytokines and remarkably down-regulated the secretion of pro-inflammatory factors. Therefore, Ket@Mg-MOF-74 is believed a promising painkiller for osteoporotic bone pain, with the function of anti-inflammatory and promoting bone formation.
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Nano Energy
·
2021
·
IF 17.881
Gabriel Sikukuu Nambafu,Kumar Siddharth,Cheng Zhang,Tianshou Zhao,Qing Chen,Khalil Amine,Minhua Shao
Symmetric redox flow batteries utilizing a single redox active material as catholyte and anolyte, offer a plausible and unique strategy to alleviate cross-contamination issues during cycling, making them an ideal energy storage device for large scale applications. In this work, a low-cost riboflavin organic molecule is coupled with a 2,2,6,6-Tetramethylpiperidinyl-N-oxyl (TEMPO) radical molecule to form a single Riboflavin-TEMPO (RIBOTEMPO) bifunctional redox active material, which is used in both aqueous anolyte and catholyte. Cyclic voltammetry analysis of the combined molecule displays electrochemically reversible reactions for the redox couples at −0.72 V and 0.51 V versus Hg/Hg 2 SO 4 , leading to a theoretical cell voltage of 1.23 V. A symmetric cell testing demonstrated over 100 consecutive charge/discharge cycles with nearly 80% coulombic efficiency and capacity retention of 44.7% at a current density of 2.5 mA cm −2 . By utilizing a pH neutral supporting electrolyte , a low-cost, safe, and environmental-friendly redox flow battery is achieved. This work provides a pathway for the design and development of bifunctional redox active molecules for symmetric battery applications.
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