APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qian Zhang,Si Chen,Zhi Huang,Yanying Liu,Jun-ming Hong
Nitrogen atom doping can effectively improve the electrocatalytic performance of graphene materials, and different nitrogen species play various roles. At present, high calcination temperature is commonly used to promote the production of graphitic N. To realize the oriented low-temperature doping of nitrogen atoms in graphene structure, we used O 3 -annealing method in this study to successfully prepare high-content graphitic N doped graphene oxide at 200 °C. Characterization results revealed that O 3 -annealing method can effectively promote the doping of N and O atoms. In addition, O 3 -annealing creating large amount defects for graphene, which directionally promoted the formation of graphitic N (reach 96.82%), which positively affected the improvement of material electrocatalytic properties. The results of bisphenol A (BPA) electrocatalytic degradation by O 3 -5 min-60 °C NGO showed that the degradation efficiency of BPA can reach 100% in 50 min under optimal conditions. The main active substances, namely O 2 − and 1 O 2 were probably generated from the edge oxygen functional groups (O-C=O and C=O) of the materials. BPA underwent a series of reactions, and was finally mineralized to CO 2 and H 2 O. This study provides a new strategy for the directional preparation of high content graphitic N doped graphene oxide for practical application.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yaping Zhang,Xi Chen,Fengqiu Jiang,Yuyu Bu,Jin-Ping Ao
In this work, we fabricate a semitransparent BiVO4 photoanode via the synergistic effect of indium (In) doping and anoxic annealing. An optimized photocurrent density of 3.6 mA cm–2 at 2 V versus reversible hydrogen electrode is obtained in a sacrificial free electrolyte system (AM 1.5G 100 mW cm–2). In-doping increases the difficulty to form bonds between Bi atoms and O atoms in the crystal bulk. Thus, quasi-oxygen vacancies in the bulk of the BiVO4 crystal can be induced under anoxic annealing to increase the mobility, lifetime, and concentration of the photogenerated carriers. On the other hand, anoxic annealing can inhibit the conversion rate of the BiOI nanosheet arrays to BiVO4 to form a nanonet structure with a large surface reaction area. Therefore, through a simple In-doping and controlled anoxic annealing process, the photogenerated carriers and the nanomorphology of BiVO4 photoanode are synergistically optimized.
研究领域:
材料科学
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光电化学
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2017
·
IF 2.714
Congfei Yin,Xiaojuan Liang,Guangcai Hu,Xie Hu,Xipeng Chen,Pengzhi Li,Weidong Xiang
The titanate , is a material of interest for various energy applications, including photovoltaics , catalysts, and high-rate energy storage devices. Herein, its related materials, CuO/CaTi 4 O 9 [CCTO] thin films , were successfully fabricated on SrTiO 3 (100) substrates by RF magnetron sputtering assisted with subsequent oxygen annealing. This obtained CCTO thin films were then systemically studied by X-ray powder diffraction (XRD), atomic force microscopy (AFM), scan electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). It was found that CuO and CaTi 4 O 9 (001) particles were closely accumulated together on the surface of the substrate in the annealing process after comparing with that of the as-prepared thin film, which was verified by SEM and AFM results. Furthermore, we investigated the third-order nonlinear optical (NLO) properties of the as-prepared and annealed CCTO thin film by means of the Z-scan technique using 650 nm femtosecond laser pulse. Post-deposition oxygen annealing was found to modify the morphological characteristics of the films, resulting in enhancing their NLO properties. The observation of NLO performance of annealed CCTO thin film indicates that RF magnetron sputtering is a feasible method for the fabrication of optical thin films, which can be expanded to fabricate other NLO materials from the corresponding dispersions. Naturally, we concluded that the CCTO thin film occupy a better NLO property, and thus enlarge its application in nonlinear optics .
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2019
·Vol. 9
·期 10
·492
·
IF 2.061
Zili Zhang,Lei Wang,Jianhua Liu,Qiuliang Wang
ErBa2Cu3O7−δ(Er123) superconductor is one of the best candidates of superconductor solder for the fabrication of superconducting joint between GdBa2Cu3O7−δ(Gd123) coated conductor, due to its highTcvalue (93 K) and highest optimized oxygen annealing temperature among RE123 compounds. In this paper, we systematically research the effect of sintering parameters on the phase formation, microstructure and superconducting properties of Er123 powder. The optimized synthesis route to acquire high purity Er123 powder with as good superconducting properties as Gd123 has been uncovered. The melt temperature of Er123 with different dopant compared to Gd123 is also investigated, and the feasible operating temperature range of Er123 superconductor solder is discussed. This work reveals a very important starting point on fabrication high-quality superconducting joint between the commercial Gd123 coated conductor, which can further improve the development of the persistent operating mode on ultra-high field nuclear magnetic resonance and magnetic resonance imaging.
研究领域:
材料科学
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超导材料
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应用物理学
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电子工程
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低温物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）