Unveiling the role of mixing in [Fe(CN)6]4− defects and Na content for preparing NaxMn[Fe(CN)6]y · nH2O via microreactor

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2025-01-20 DOI:10.1002/aic.18735

Hao-Tian Tong, Shi-Xiao Wei, Yan-Jiang Liu, Ting-Liang Xie, Shuang-Feng Yin

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引用次数: 0

Abstract

Taking advantage of strong mixing performance in oscillating feedback microreactor (OFM), the manganese hexacyanoferrates (Na_xMn[Fe(CN)₆]_y · nH₂O, MnHCFs) with low defects and high sodium content were controllably prepared. First, fluid mixing performance in OFM was investigated via dye-tracer and Villermaux-Dushman experiments, and the fluid mixing mechanism in OFM was investigated through CFD simulations. Then, MnHCFs were prepared using OFM at different flow rates, and the role of mixing in [Fe(CN)₆]⁴⁻ vacancies and sodium content during co-precipitation synthesis of MnHCFs was discussed. The results indicate that an increase in flow rates can increase fluid chaos strength, enhancing the mass transfer process to match the extremely fast reaction rate of MnHCFs, thus preparing MnHCFs with high sodium content and low defects. Relevant electrochemical tests indicate that the MnHCF prepared at the largest throughput (180 mL/min) has the highest initial specific capacity (132 mAh/g at 15 mA/g), minimum electrochemical impedance, and fastest sodium ion transport rate.

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揭示了在微反应器中混合[Fe(CN)6]4−缺陷和Na含量对制备NaxMn[Fe(CN)6]y·nH2O的作用

利用振荡反馈微反应器（OFM）的强混合性能，可控制备了缺陷低、钠含量高的六氰高铁锰酸盐（NaxMn[Fe(CN)6]y·nH2O, MnHCFs）。首先，通过染料示踪剂和Villermaux - Dushman实验研究了OFM中的流体混合性能，并通过CFD模拟研究了OFM中的流体混合机理。然后，用OFM在不同流速下制备了mnhcf，并讨论了共沉淀法合成mnhcf时，混合在[Fe(CN)6]4−空位和钠含量中的作用。结果表明，增大流量可以增加流体混沌强度，增强传质过程，以匹配mnhcf极快的反应速率，从而制备出高钠含量、低缺陷的mnhcf。相关电化学测试表明，在最大通量（180 mL/min）下制备的MnHCF具有最高的初始比容量（15 mA/g时为132 mAh/g）、最小的电化学阻抗和最快的钠离子传输速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.