JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Dongfeng Sun,Songmin Lin,Yuan Yu,Fangyou Meng,Gaohui Du,Bingshe Xu
It is still challenging to design and synthesize highly efficient and noble-metal-free electrocatalysts for hydrogen/oxygen evolution reaction (HER/OER). Herein, we developed an in-situ phosphating Co@nitrogen-doping graphene to obtain N and P co-doped carbon-coated cobalt phosphide (CoP@N,P C) that could be used for overall water splitting. The unique 3D porous structure of CoP@N,P C is characterized by a large number of active catalytic sites. High wettability of catalyst in electrolyte solution facilitates the transfer of ions. The synergism between the CoP cores and N, P C shells improves the total hydrolysis performance of the electrocatalyst during the HER and OER. At the current densities of 10 mA/cm 2 (1 M of KOH), the HER overpotential recorded for the CoP@N,P C is 113 mV, and the OER overpotential is 320 mV. The cell voltage of the CoP@N,P C as bifunctional electrode for overall water splitting is 1.67 V (at 10 mA/cm 2 ), which is close to that of the full noble-metal electrode (RuO 2 || Pt/C, 1.58 V). The CoP@N, P C bifunctional catalyst can be potentially used to replace noble-metal electrodes to realize water splitting.
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高影响因子
Journal of Energy Storage
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2021
·
IF 6.583
Jie Xu,Cuili Xiang,Songwen Fang,Luping Zhu,Fen Xu,Lixian Sun,Yongjin Zou,Jian Zhang
Supercapacitors, such as pseudocapacitors (PCs), are widely used because of their excellent electrochemical activity and capacitance; however, it is still challenging to fabricate PCs with high stability and good electrochemical properties. Therefore, suitable templates and transition metal composite materials should be selected for improving their performance. Binary transition metal sulfides exhibit excellent electrochemical performance owing to their rich valence, electrical conductivity, and abundant electrochemical active sites. In this study, we prepared porous Mn-Co-S nanospheres (MCSN) via the hydrothermal method using silica colloidal particles was as the template; to the best of our knowledge, this is the first study to synthesize MCSN. Results suggest that the MCSN composite exhibited excellent conductivity and enhanced stability owing to the porous structure formed by the vertical growth of MnS 2 -CoS 2 nanosheets on silica nanoparticles. The porous MCSN electrode showed an excellent specific capacitance of 1158 F g −1 at 1 A g −1 . Moreover, when coupled with an activated carbon (AC) positive electrode, the supercapacitor of MCSN//AC exhibited stability of 90.4% after 5000 cycles at 10 A g −1 (the specific energy of 34 W h kg −1 at 775 W kg −1 ). Given the results, we believe that the prepared MCSN material has potential application prospects for high-efficiency supercapacitors.
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Journal of Magnesium and Alloys
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2021
·
IF 10.088
Bogu Liu,Bao Zhang,Haixiang Huang,Xiaohong Chen,Yujie Lv,Zhongyu Li,Jianguang Yuan,Ying Wu
Ni and carbon materials exhibit remarkable catalysis for the hydriding reaction of Mg. But the underlying mechanism of Ni/C hybrid catalysis is still unclear. In this work, density functional theory (DFT) calculation is applied to investigate the effect of Ni/C co-incorporation on the hydriding reaction of Mg crystal. The morphology and crystal structure of the Ni/C co-incorporated Mg sample show that the co-incorporated structure is credible. The transition state searching calculation suggests that both the incorporations of Ni and C are beneficial for the H 2 dissociation. But Ni atom has a dramatic improvement for H 2 dissociation and makes the H diffusion become limiting step of the hyriding reaction. The Ni d z 2 orbit and H s orbit accept the electrons and combine together compactly, while the Ni d xy orbit is half-occupied. The catalytic effect of Ni on H 2 dissociation can be ascribed to the bridging effect of Ni d xy orbit. The incorporation of C can weaken the over-strong interaction between Ni and H which hindered the H diffusion on Mg(0001). The Ni/C co-incorporated Mg(0001) shows the best performance during hyriding reaction compared with the clean and single incorporated Mg(0001).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Lingyu Sun,Yu Wang,Xiaoxuan Zhang,Feika Bian,Luoran Shang,Yuanjin Zhao,Weijian Sun
Functional materials with specific wettability have broad technological implications in various fields. Herein, inspired by the rapid replenishment of Nepenthes nectaries, we present novel lubricant infused hierarchical porous surfaces with self-replenishing and self-reporting capacities. As the porous surfaces were replicated from colloidal co-assembly templates, they were composed of an inverse opal nano-porous structured outer surface layer to lock the lubricant and maintain the surface stability, together with an embedded macro-porous network as reservoirs to store and supply the lubricant for self-healing. We have demonstrated that the hierarchical inverse opal films are in possess of liquid-repelling feature on liquids with different surface tensions (22.3 mN/m to 72.8 mN/m) and favorable self-replenishment capacity for stable droplet manipulation. In addition, the structural colors arisen from the periodic nanostructure could serve as an optical indicator to monitor the wettability of the resultant slippery surfaces, thus greatly expanding their practical values. These features make the self-replenishing slippery surfaces ideal candidates for various applications such as optical sensing, fluid transportation, medical self-cleaning, and so on.
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高影响因子
CARBON
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2021
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IF 9.594
Feng Liu,Zeyu Li,Yu Li,Yiyu Feng,Wei Feng
The spin-forbidden nature of triplet exciton transitions is a limitation for achieving a carbon dots-based material with room-temperature phosphorescence (RTP). Here, fluorine-nitrogen co-doped carbon dots (FNCDs), prepared using the solvothermal method and further gas-phase fluorination from fructose and diethylenetriamine (DETA), were found to exhibit RTP lifetime and quantum yield of 1.14 s and 8.3%. By comparing the structure and performance of the nitrogen-doped carbon dots (NCDs) and FNCDs, it was found that the RTP of FNCDs originates from the π→π∗ and n→π∗ electron transitions C–N/C N, which can be attributed to the small energy gap between the singlet and triplet states. We further explored the mechanism of RTP by analyzing the hydrogen bonding between carbon dots and polyvinyl alcohol matrix. The semi-ionic C–F bonds also enhance intramolecular and intermolecular hydrogen bonding and reduce the quenching of RTP without the oxygen barrier. Furthermore, we applied the prepared aqueous FNCDs as an advanced security ink for information printing and anti-counterfeiting.
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高影响因子
Molecular Catalysis
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2021
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IF 5.062
Fei Peng,Qing-Sheng Chen,Min-Hua Zong,Wen-Yong Lou
Sequential immobilization of multiple enzymes can not merely improve the enzymatic activity and enzyme stability but also facilitate the recovery for reuse, well imitating the natural enzyme complexes. Here, we developed a novel approach of preparing sequential multienzyme nanomachineries based on chemical crosslinking and protein assembly, and then characterized the nanodevice. In the preparation process, Kg BDH-SC (SpyCatcher-fused (2 R ,3 R )-2,3-butanediol hydrogenase) was firstly immobilized onto the functionalized silicon dioxide nanoparticles with glutaraldehyde, and then FDH-ST (SpyTag-fused formate hydrogenase) was immobilized by the spontaneous protein reaction between SpyTag and SpyCatcher to achieve the sequential co-immobilized enzymes FDH-ST-SC- Kg BDH@SiO 2 , which can asymmetrically reduce 2-hydroxyacetophenone to ( R )-1-phenyl-1,2-ethanediol by cofactor regeneration. In comparison to the mixture of free enzymes, the sequential co-immobilized enzymes created under the design conditions performed around 50% activity recovery. Furthermore, FDH-ST-SC- Kg BDH@SiO 2 presented wider pH tolerance and greater organic solvents tolerance than the mixture of free enzymes as well as retained 51.7% of overall activity after being recycled eight times. Finally, the sequential co-immobilized enzyme enabled the biosynthesis of ( R )-1-phenyl-1,2-ethanediol from 80 mM 2-hydroxyacetophenone in the phosphate buffer reaction system, with 87.4% yield and over 99% optical purity.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 28
·期 32
·43815-43830
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IF 4.223
Liu Yaxin,Ma Yongwen,Wan Jinquan,Wang Yan,Sun Jian,Xue Yangyang
In this work, Co-Ce-Zr/γ-Al 2 O3 3 particle electrodes were prepared for the efficient degradation of ciprofloxacin (CIP). Co-Ce-Zr/γ-Al 2 O 3 particle electrodes were analyzed with a scanning electron microscope (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence Spectrometer (XRF), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). According to the results, significant amounts of Co 3 O 4 , CeO 2 , and ZrO 2 were formed on the Co-Ce-Zr/γ-Al 2 O 3 particle electrodes. It was shown that when the conditions of the reaction system were at pH=6, conductivity of 4 ms/cm, current of 0.2 A, initial pollutant concentration of 100 mg/L, and material dosage of 15 g, CIP could be completely degraded within 40 min, and the energy consumed in the reaction was 41.3 kWh/kg CIP. The rate of total organic carbon (TOC) removal by Co-Ce-Zr/γ-Al 2 O 3 particle electrodes was recorded to be approximately 52.6%. Using a response surface methodology, we explored the optimal operating conditions. At the same time, we also explored the influence of inorganic anions in water and actual water medium on the rate of CIP removal. In addition, the ESR data proved that the main active substance in the reaction system was ·OH. The degradation intermediates were investigated, and the possible mechanism was proposed. Thus, this research provided a new solution for the treatment of antibiotic-containing wastewater.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Yu Zeng,Chenhan Xiong,Jingxuan Li,Zhiyong Huang,Guoping Du,Zhaoyang Fan,Nan Chen
Ceramic/polymer composites have great potential to achieve the concomitant enhancement of both dielectric constant and breakdown field while maintaining other superior properties of the polymer matrix , ideal for elastomer sensors, actuators, capacitive energy storage, and many other applications. However, material incompatibility between the ceramic filler and the polymer matrix often leads to void formation , particle aggregation and phase separation, with significantly degraded performance. Herein, through surface modification, co-doped TiO 2 particles were uniformly dispersed and bridged onto the silicone rubber matrix via a silane coupling agent for fabricating composites via mechanical mixing and hot-pressing. The synthesized composites exhibit enhanced dielectric constant, increased from 2.78 to 5.06 when 50 wt% co-doped TiO 2 particles are incorporated. Their dielectric loss is less than 0.001 in a broad frequency range. Theoretical modelling and experimental results reveal that the morphology and dispersion state of co-doped TiO 2 particles were crucial to the dielectric properties of the silicone rubber-based composites. Besides, the composites are thermally stable up to 400 °C. Significantly increased tensile strength (612 kPa) and elongation at break (330%) were obtained for the composite incorporated with 30 wt% co-doped TiO 2 particles, accompanied by a moderate increased elastic module (540 kPa). Such composites have the potential for different applications.
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DRUG DELIVERY
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2021
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IF 6.419
Mingming Song,Wentao Xia,Zixuan Tao,Bin Zhu,Wenxiang Zhang,Chang Liu,Siyu Chen
Malignant melanoma is a life-threatening form of skin cancer with a low response rate to single-agent chemotherapy. Although combined therapies of metformin (MET) and doxorubicin (DOX) are effective in treating a variety of cancers, including breast cancer, their different physicochemical properties and administration routines reduce the effective co-accumulation of both drugs in tumors. Nanoparticles (NPs) have been demonstrated to potentially improve drug delivery efficiency in cancer therapy of, for example, liver and lung cancers. Hence, in this study, we prepared pH-sensitive, biocompatible, tumor-targeting NPs based on the conjugation of biomaterials, including sodium alginate, cholesterol, and folic acid (FCA). As expected, since cholesterol and folic acid are two essentials, but insufficient, substrates for melanoma growth, we observed that the FCA NPs specifically and highly effectively accumulated in xenograft melanoma tumors. Taking advantage of the FCA NP system, we successfully co-delivered a combination of MET and DOX into melanoma tumors to trigger pyroptosis, apoptosis, and necroptosis (PANoptosis) of the melanoma cells, thus blocking melanoma progression. Combined, the establishment of such an FCA NP system provides a promising vector for effective drug delivery into melanoma and increases the possibility and efficiency of drug combinations for cancer treatment.
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PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
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2021
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IF 2.436
Yihang Dong,Zhaoyang Liu,Lipeng Pang,Ye Han,Shuyu Yao,Xiangnan Wang
{(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6) is synthesized by co-precipitation method. Thermal analysis, phase structure, lattice constant , micro-morphology, elements distribution, density, open porosity and electrical conductivity are measured by TG, DSC , XRD , GSAS, SEM , EDS, Archimedes method and EIS respectively, and the influence of CeO 2 content on the above properties are investigated. TG-DSC results show that the weight loss of the sample is mainly due to the decomposition of the initial powder, forming a solid solution above ~600 °C. XRD results show that {(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6) is a cubic solid solution, and the lattice parameters and volume increase with the increase of CeO 2 content. SEM results show that YZC is a dense sintered body. Density and open porosity of YZC sample are ~4.5 g cm −3 and ~0.12, respectively. The electrical conductivity results show that the conductivity of {(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.2) is equivalent, and then the conductivity decreases due to defect association with the increase of CeO 2 content.
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高影响因子
CRYSTENGCOMM
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2021
·Vol. 23
·期 25
·4451-4458
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IF 3.545
Wenxuan Ma,Shuhua Hao,Lei Zhang,Baoyi Lv,Gang Zhao,Jinzhao Huang,Xijin Xu
CdS is widely used in the field of photocatalysis owing to its excellent photocatalytic H2 evolution (PHE) activity, but the photocatalytic stability of CdS is inhibited because of the drawback of photocorrosion. Under light, the introduction of WS2 cocatalysts induces the growth of layered CdS on the WS2 nanosheets. Through the photocatalytic activity measurement, after adding ultrathin WS2 nanosheets, the amount of H2 released can reach 139.15 mmol g−1 after 7 h, which is 11.3 times higher than that of pure CdS nanoparticles. Furthermore, these composites illustrate excellent light absorption performance in the near-infrared region. A heterojunction is formed between WS2 and CdS under light, which greatly promotes the mobility of interface carriers and limits the recombination of photogenerated carriers. The hydrogen evolution output remains stable after 42 h, and the photocorrosion problem is effectively suppressed. In this work, we provide an effective and simple method to improve photocatalytic activity and stability, which is beneficial to the practical development of photocatalysis.
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JOURNAL OF MATERIALS RESEARCH
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2021
·Vol. 36
·期 6
·1250-1261
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IF 3.089
Lin Zhilan,Zhu Jianhui,Zhang Peixin,Deng Libo
Abstract Spherical carbonaceous materials are considered as ideal electrode materials for supercapacitors because of their high electrical conductivity and excellent electrochemical and mechanical stability. However, their overall performances are yet to be enhanced to meet the future demands. Herein, we prepared a supercapacitive carbon microsphere with hierarchical porous structure and doped them with both nitrogen and phosphor. This was achieved by a facile hydrothermal treatment of cyclodextrin, followed by pyrolysis in the presence of ammonium dihydrogen phosphate and finally by KOH activation. Benefiting from the porous microspheres structure, large surface area, and rich nitrogen and phosphorus heteroatoms, the as-prepared materials demonstrated excellent capacitive performance, with a specific capacitance of 182 F g −1 at 1.0 A g −1 and good rate performance as well as 100% retention after repeated charging and discharging for 5000 cycles, which are superior to the carbon microspheres without heteroatom doping. Graphic abstract
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危险品化学品经营许可证（带存储）