Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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Numerical simulation of fluidization: Driven by challenges
No full textIn the century-long development of fluidization technology, simulation methods have evolved in response to scientific and engineering demands, which in turn have produced advances in technology. Faced with the pro-found global challenges of climate change and sustainable development, fluidization has found new applications in carbon capture and utilization, non-energy uses of fossil fuels, production of functional materials, and the continuous production of drugs and fine chemicals. Revolutionary research and development tools, such as digital virtual reactors and even factories, are highly desirable for the effective and efficient conceptualization, scaling-up, and optimization of the processes and equipment in these sophisticated applications, and require unprecedented advances in the accuracy and speed of simulations. After a short review of the existing simulation methods for fluidization, this article focuses on how such advances could be achieved through the organic integration of multiscale modeling, scalable algorithms, and supercomputing
CoaST Maritime Test Centre: an investigation of biofouling propensity
No full textThe performance of fouling control coatings (FCC) is evaluated based on static exposure on test sites worldwide. There are different standards concerning the evaluation of the performance of the FCC. However, to the knowledge of the authors, there is not a standardized reporting guideline for how to evaluate the test site in which the FCC is exposed. Several factors such as water conditions, seasonal biofouling, and accessibility of sunlight can vary dependent on placement within or between test sites. This in turn makes it difficult to compare the performance of FCC exposed at different locations within a or at another test site. In this study, an analysis of the CoaST Maritime Test Centre (CMTC) has been performed to investigate how geographical orientation and changes in depth influence the biofouling propensity on coated panels. The investigation showed no statistical significance in the biofouling propensity between panels exposed to different geographical orientations at the CMTC. Similarly, no statistical significance was found between panels placed at different depths at the CMTC. If similar reporting was performed at other test sites, a better basis for comparison of FCC worldwide would be obtained, and this could be achieved with a standardized reporting guideline
High-performance asymmetric supercapacitor based on nickel-MOF anchored MXene//NPC/rGO
No full textMXene has been considered a viable 2D electrode material for supercapacitors due to its good conductivity and remarkable cycling stability. However, its low specific capacitance has limited its applications. To address this, we deposited nickel-metal-organic-framework (Ni-ZIF-67) on MXene. Firstly, Ni-ZIF-67 composites were syn-thesized at various temperatures (150-450 celcius), with different masses of Ni. Among the Ni-ZIF-67 (NZ) compos-ites, the NZ-R-2-200 electrode exhibited the largest specific surface area of 549.78 m2/g, and the highest specific capacity of 365.5 C/g at 0.5 A/g. Then, the NZ-R-2-200/K-Ar-MXene composite was prepared by dec-orating intercalated 2D MXene (K-Ar-MXene) with NZ-R-2-200. NZ-R-2-200 were anchored on the surface of K-Ar-MXene. Significantly, an electrode based on NZ-R-2-200/K-Ar-MXene composite demonstrates a remarkable specific capacity of 557 C/g at 0.5 A/g and long-time stability of 66 % capacitance retention after 5000 cycles at 2 A/g. An assembled asymmetric supercapacitor (ASC) based on NZ-R-2-200/K-Ar-MXene as the positive and porous carbon composite of (NPC/rGO) as the negative electrodes showed a high energy density of 27.48 Wh/Kg and a power density of 400 W/Kg combined with cyclic stability up to 2000 cycles
Synergistic modification of Ni-rich full concentration gradient materials with enhanced thermal stability
No full textMajor challenge hindering the large-scale applications of Ni-rich cathode materials (CAMs) lies on the poor cycle (especially under elevated temperature or high cutoff voltage) and thermal stability due to the highly reactive Ni4+. Herein, the full concentration strategy is combined with Ti pillar and Li2ZrO3 (LZO) coating modification, on which a high-performance CAM with elevated kinetics and stability, CGTZ-1, is obtained. It proves that both cycle and thermal stability can be greatly enhanced by the concentration gradient design and the LZO coating. Whereas the promoted Li+ diffusion coefficient is largely attributed to the Ti pillar. The optimal resultant CAM shows high capacity retention of 88.1% after 200 cycles under 55 degrees C, while that of pristine is only 32.1%. More importantly, it also shows a high thermal release temperature of 261.5 degrees C (vs 222.3 degrees C of the pristine), which demonstrates the effectiveness of this synergistic modification strategy