ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Lei Ding,Tianyue Huang,Dawei Zhang,Pan Qi,Lihao Zhang,Cong Lin,Hao Luo
Rational design and synthesis of high-performance bifunctional oxygen electrocatalysts with increased effective active sites and facilitated mass/electron transfer are in demand for the lithium-oxygen batteries (LOBs) to overcome the sluggish oxygen reduction/evolution kinetics. Herein, a simple yet effective strategy is proposed by annealing the Prussian blue analog (PBA) precursor under altered calcination conditions to achieve the efficient nano-heterojunction catalysts with optimized active sites. As a result, the obtained porous Co 3 O 4 /Co nano-heterostructures embedded in N-doped graphitized carbon matrix (Co 3 O 4 /Co@NC) exhibit outstanding electrochemical performance with a high specific capacity of 22,156 mA h g −1 at the current density of 100 mA g −1 and excellent stability, obviously superior to the LOBs based on the other single-component catalysts. Systematic investigations suggest that the enhanced electrochemical performance is ascribed to the Co 3 O 4 /Co nano-heterostructure interface and the N-doped porous carbon matrix. This study presents a simple and effective approach for boosting the PBA-derived catalysts with efficient reactivity for various catalytic applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
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产品关联
DOI
高影响因子
BIOMATERIALS
·
2022
·
IF 15.304
Haiyan Pan,Quan Zou,Tingting Wang,Dong Li,Shao-Kai Sun
Diverse oxygen generation strategies have been developed to overcome hypoxia in tumors for enhancing the therapeutic efficacy, but inevitably suffering from tedious synthesis process of oxygen generators in vitro before in vivo administration. Herein, we show direct injection of commercially and clinically used KMnO 4 into solid tumors enables in situ formation of MnO 2 as an oxygen depot for cascade oxidation damage and enhanced photodynamic therapy. KMnO 4 can damage tumor tissues by oxidation and generate MnO 2 , and subsequent intravenous injection of Ce6 allows MnO 2 -triggered hypoxia-modulated photodynamic therapy of tumors. Excellent cascade tumor suppression effect is realized both in vitro and in vivo based on the KMnO 4 –Ce6 system without the need of synthesis. The proposed strategy lays down a novel way with unprecedented superiors of no need of synthesis process and ultra-facile administration procedure for tumor hypoxia-modulated cascade therapy.
研究领域:
肿瘤学
·
生物医学工程
·
药理学
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产品关联
DOI
PubMed
高影响因子
Nano Research
·
2022
·Vol. 16
·期 6
·8405-8410
·
IF 10.269
Cao Renfei,Cui Yangfeng,Huang Gang,Liu Wanqiang,Liu Jianwei,Zhang Xinbo
Li-O 2 batteries with extremely high specific energy density have been regarded as a kind of promising successor to current Li-ion batteries. However, the high charge overpotential for the decomposition of Li 2 O 2 discharge product reduces the energy efficiency and triggers a series of side reactions that cause the Li-O 2 batteries to have a limited lifetime. Herein, Co-doped C 3 N 4 (Co-C 3 N 4 ) photocatalysts were designed by an in situ thermal evaporation method to take advantage of the photo-assisted charging technology to conquer the shortcomings of Li-O 2 batteries encountered in the charge process. Different from the commonly used photocatalysts, the Co-C 3 N 4 photocatalysts perform well no matter with and without illumination, owing to the Co doping induced conductivity and electrocatalytic ability enhancement. This makes the Co-C 3 N 4 reduce the charge and discharge overpotentials and improve the cycling performance of Li-O 2 batteries (from 20 to 106 cycles) without illumination. While introducing illumination, the performance can be further improved: Charge voltage reduces to 3.3 V, and the energy efficiency increases to 84.84%, indicating that the Co-C 3 N 4 could behave as a suitable photocathode for Li-O 2 batteries. Besides, the low charge voltage and the continuous illumination together weaken the corrosion of the Li anode, making the long-term high-efficiency operation of Li-O 2 batteries no longer just extravagant hope.
研究领域:
材料科学
·
电化学
·
能源技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Danhua Ma,Wei Chen,Liang Wang,Renlu Han,Keqi Tang
Tumor hypoxia and high levels of intracellular glutathione (GSH) significantly limit the efficacy of photodynamic therapy (PDT). In addition, a single PDT treatment strategy is relatively insufficient to eliminate tumor, further limiting its application in biomedicine . Therefore, we demonstrated an omnipotent nanoplatform based on 2,2′-azobis [2-(2 imidazolin-2-yl)propane] dihydrochloride (AIPH) loaded manganese dioxide (MnO 2 ) nanoflower (abbreviated as MnO 2 -AIPH) with simultaneously self-supplying oxygen (O 2 ), depleting GSH, performing PDT, photothermal (PTT) and thermodynamic therapy (TDT) for boosting antitumor effects . By 808 nm near infrared (NIR) light irradiation , MnO 2 -AIPH not only reveals highly toxic reactive oxygen species (ROS) generation and excellent photothermal conversion ability for PDT and PTT, but also generates alkyl radicals by decomposing AIPH for TDT simultaneously to eliminate tumor effectively. Once internalized into the tumor, MnO 2 will be degraded to Mn 2+ which catalyzes endogenous hydrogen peroxide (H 2 O 2 ) into O 2 for enhanced PDT. Moreover, MnO 2 can facilitate GSH oxidation to amplify oxidative stress , further enhancing ROS and alkyl radicals mediated cancer cell killing. In brief, this study provides a paradigm of antitumor efficiency amplification by the combination of sustained oxygen supply, potent GSH depletion, and phototherapy synergistic TDT.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jianxiong Lin,Hui Guo,Kun Sun,Liang Fang
Nickel (Ni)-rich layered oxides have high specific capacities and are inexpensive, but their synthesis and electrochemical performance continue to present difficulties. In this study, we investigated the effect of a dual conductive compound of dot-like Nb 12 WO 33 and film-like lithium boron oxide (Li-B-O; applied using a simple dry-coating method) on the Ni-rich oxide layer in Li batteries. The film-like Li-B-O homogeneous coating segregated the cathode from the electrolyte, which improved the initial efficiency and cycle stability, and the dot-like Nb 12 WO 33 provided a fast Li-ion transition channel, which improved the rate performance of the Ni-rich oxide layer. The modified cathode with dual conductive coating exhibited significantly improved electrochemical performance. Its discharge capacity was 225.6 mAh g −1 , with high initial efficiency of 92.73% in the voltage range of 3.0–4.3 V at 0.1 C, whereas that of the uncoated sample was 219.4 mAh g −1 , with an initial efficiency of 90.4%. The modified cathode had a discharge capacity of 179.1 mAh g −1 at 5 C, compared with that of 161.1 mAh g −1 for the uncoated sample; the capacity retention of the coated sample was 92.84% at 0.5 C after 50 cycles at 25 ℃, whereas that of the uncoated sample was only 81.41%. A similar strategy could be utilized to enhance the performance of other cathode materials .
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ChemMedChem
·
2023
·
IF 3.4
Wei Meng,Hongbo Ye,Zhifang Ma,Lei Liu,Tianci Zhang,Qiaoyi Han,Zehong Xiang,Yu Xia,Yue Ke,Xinghua Guan,Qiang Shi,Fazly I. Ataullakhanov,Mikhail Panteleev
Ischemic stroke primarily leads to insufficient oxygen delivery in ischemic area. Prompt reperfusion treatment for restoration of oxygen is clinically suggested but mediates more surging reactive oxygen species (ROS) generation and oxidative damage, known as ischemia-reperfusion injury (IRI). Therefore, the regulation of oxygen content is a critical point to prevent cerebral ischemia induced pathological responses and simultaneously alleviate IRI triggered by the sudden oxygen restoration. In this work, we constructed a perfluorocarbon (PFC)-based artificial oxygen nanocarrier (PFTBA-L@GB), using an ultrasound-assisted emulsification method, alleviates the intracerebral hypoxic state in ischemia stage and IRI after reperfusion. The high oxygen solubility of PFC allows high oxygen efficacy. Furthermore, PFC has the adhesion affinity to platelets and prevents the overactivation of platelet. The encapsulated payload, ginkgolide B (GB) exerts its anti-thrombosis by antagonism on platelet activating factor and antioxidant effect by upregulation of antioxidant molecular pathway. The versatility of the present strategy provides a practical approach to build a simple, safe, and relatively effective oxygen delivery agent to alleviate hypoxia, promote intracerebral oxygenation, anti-inflammatory, reduce intracerebral oxidative stress damage and thrombosis and caused by stroke.
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Xin Huang,Zijun Ran,Zhi He,Jingyu Ran
Mercury has a significant impact on environment and is mainly derived from coal-fired power plant. Herein, we report a potential route for efficient removal of Hg 0 via oxidation reactions using Ce-doped LaCoO 3 supported on CeO 2 catalyst. Catalyst characterization results proved that Ce can successfully substitute a desired part of Co into the LaCoO 3 crystal lattice via a sol–gel method. The Hg 0 removal experiments suggest that Hg 0 removal efficiency decreased in the order of La 0.875 Ce 0.125 CoO 3 /CeO 2 > La 0.875 Ce 0.125 CoO 3 > LaCoO 3 . The presence of O 2 provided more active oxygen and resulted in approaching 100% Hg 0 removal efficiency. Introducing H 2 O and sole SO 2 would significantly reduce the Hg 0 removal efficiency as a result of competitive adsorption on the actives sites of the catalyst. On the other hand, SO 2 could reacted with Hg 0 in the presence of O 2 and thereby recover the high Hg 0 removal efficiency and the La 0.875 Ce 0.125 CoO 3 /CeO 2 catalyst presented a good performance towards sulfur resistance. Furthermore, the catalyst still exhibited a high Hg 0 removal efficiency performance after five times consecutive recycles.
研究领域:
环境科学
·
催化
·
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Tong Zhang,Liming Deng,Pei Li
Previous studies demonstrate that decarboxylation cross-linking improves both the plasticization resistance and gas separation properties of a polymer precursor. However, when the decarboxylation reactions were carried out at low temperatures (350–400 °C), gas permeability was low because of the intrinsically low gas permeability of the polymer precursor. In this work, we synthesized a series of highly permeable polymer precursors having a triptycene-based Tröger’s base (TB) backbone structure and different amounts of carboxylic acid side groups. The TB polymer precursors were heated in a temperature range of 275–400 °C to induce cross-linking. After cross-linking, a more open polymer structure was obtained, resulting in an increase in the free volume fraction and gas permeability. The lowest cross-linking temperature was 350 °C and the separation performances of the cross-linked polymers surpassed the “2008 Robeson Upper Bound” for the CO2/CH4 and O2/N2 gas pairs. Moreover, the cross-linked polymers were not plasticized by CO2 at a pressure up to 30 bar.
研究领域:
材料科学
·
聚合物化学
·
气体分离
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jiajun Long,Longqian Xu,Linghui Zhao,Huaqiang Chu,Yunfeng Mao,Deli Wu
In this study, Cu(0) was synthesized with NaBH 4 as a reducing agent for Cu(II) and used to activate dissolved molecular oxygen (O 2 ) under acidic conditions. The Cu(0) synthesized had much higher activity than the purchased. The roles of Cu was clarified and the formation of reactive oxygen species was discussed through direct detection for the first time. By detecting the valence change of Cu in a CuO system, Bisphenol A (BPA) was found to accelerate the transformation of Cu(II) to Cu(I). Besides, the evidence from electron spin resonance (ESR) studies and scavenging tests revealed the new roles of Cu(0) that Cu(0) could not only convert O 2 to produce ·O 2 − , but also catalyze H 2 O 2 to ·OH. The results from this study offer evidence of new reaction pathways in Cu-activated O 2 systems and deepen understanding of the reaction between Cu species and O 2 .
研究领域:
环境科学
·
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 28
·285701
·
IF 3.953
Lei Guo,Huifang Li,Dandan Liu,Yurong Zhou,Lizhong Dong,Siqi Zhu,Yulong Wu,Zhenzhong Yong,Lixing Kang,Hehua Jin,Qingwen Li
Carbon nanotube (CNT)/copper (Cu) composite fibers are placed great expectations as the next generation of light-weight, conductive wires. However, the electrical and mechanical performances still need to be enhanced. Herein, we demonstrate a strategy that is electrodeposition Cu on thiolated CNT fibers to solve the grand challenge which is enhancing the performance of CNT/Cu composite fibers. Thiol groups are introduced to the surface of the CNT fibers through a controllable O2 plasma carboxylation process and amide reaction. Compared with CNT/Cu composite fibers, there are 82.7% and 29.6% improvements in electrical conductivity and tensile strength of interface thiol-modification composite fibers. The enhancement mechanism is also explored that thiolated CNT fibers could make strong interactions between Cu and CNT, enhancing the electrical and mechanical performance of CNT/Cu composites. This work proposes a convenient, heat-treatment-free strategy for high-performance CNT/Cu composite fibers, which can be manufactured for large-scale production and applied to next-generation conductive wires.
研究领域:
材料科学
·
纳米技术
·
复合材料
·
电气工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Suzhou Xu,Can Liu,Xuping Jiang,Xinyu Wang,Shijin Zhang,Yanting Zhang,Qingguo Wang,Weiling Xiong,Jing Zhang
The performance and mechanisms of a titanium carbide (Ti 3 C 2 ) MXene modified Fe 3+ /hydrogen peroxide (H 2 O 2 ) system were compared in detail under dark and visible light conditions, with a new mechanism proposed for the reaction and reduction of MXene by Fe 3+ . Using Bisphenol A (BPA) as the target pollutant, the degradation of BPA by the Fe 3+ /H 2 O 2 system was improved after adding MXene in the dark, and the degradation rate of BPA was ≥ 95 % within 12.5 min under visible light, six times higher than that in the dark. Fe 2+ was ascertained to be the effective component responsible for H 2 O 2 activation to produce ·OH. SEM , XPS, ICP, XRD, and FTIR spectroscopy , analyses show that MXene and Fe 3+ form a complex, and then MXene reacts with Fe 3+ by breaking the Ti–C bonding to accelerate the Fe 3+ /Fe 2+ cycle. MXene uses photogenerated electrons to promote this reaction under visible light. In addition, quenching experiments and electron spin resonance spectroscopy results show that ·OH and O 2 •− are the main reactive oxygen species under visible light, while ·OH is the main active species in the dark. MXene thus effectively uses O 2 to form O 2 •− under visible light and promotes the Fe 3+ /Fe 2+ cycle. This study provides a theoretical basis for the combination of visible light catalysis and the advanced oxidation process of a Ti 3 C 2 MXene.
研究领域:
环境科学
·
化学工程
·
材料科学
·
高级氧化过程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Kaiwei Wang,Hao Ruan,Fumin Wang,Yi Zhai,Mingshuai Sun,Yan Chen,Jiaxing Zhang,Yihao Wang,Xuyang Zou,Xubin Zhang
The construction of abundant TiO 6 active sites within the zeolite framework is essential for further enhancing the catalytic performance of TS-1 zeolite. Here, we employ a strategy involving treatment with a mixture of amines and ammonium salts to generate abundant TiO 6 species within zeolites synthesized with the assistance of N,N-dimethylformamide (DMF). It was observed that during the post-treatment process, the presence of amines and ammonium salts plays a key role for the formation of highly active TiO 6 species. The incorporation of DMF can significantly enhance the TiO 6 content in the post-treated zeolite, increasing it to 61.5 % compared with 28.5 % in the zeolite synthesized without DMF. The effect of the DMF/SiO 2 ratio in the synthesized gel on the morphology and catalytic performance was also examined. It is noteworthy that the incorporation of DMF influences the microenvironment of the Ti active sites following post-treatment. 1 H MAS NMR analysis reveals that the characteristic peaks corresponding to Ti-OH and isolated Si-OH groups in the DMF-synthesized catalyst are significantly intensified after treatment with amines and ammonium salts. When H 2 O 2 is employed as an oxidant, the optimal catalytic performance achieves a cyclohexene conversion of 51.1 % and a cyclohexene oxide yield of 39.4 %, with a high TOF value of 92.77 h −1 . Notably, the catalyst exhibits a significantly conversion rate of 79.4 % and a yield of 72.7 % using O 2 as the oxidant.
研究领域:
催化化学
·
材料科学
·
无机化学
·
石油化工
·
绿色氧化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）