向纳米电催化剂传质

IF 3.5 3区 工程技术 Q2 ENGINEERING, CHEMICAL
AIChE Journal Pub Date : 2024-08-07 DOI:10.1002/aic.18530
Klaudia Mata Robinson, Matthew Jordan, Theodore F. Wiesner
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引用次数: 0

摘要

有关纳米球(1 nm ≤ dp ≤ 100 nm)传质的研究很少。我们对金纳米球上六氰基铁酸酯(III)到六氰基铁酸酯(II)的电催化还原进行了实验研究。表面通量对 dp ≥ 30 nm 的颗粒大小不敏感,与扩散受限系统的通量基本相同。然而,在 5 nm ≤ dp ≤ 30 nm 范围内测得的通量比纯扩散受限模型预测的通量小一到三个数量级。通过数学建模,我们评估了实验系统中影响纳米粒子传质的六种机制。在潜在的加速效应中,曲率效应使表面通量急剧增加了 20 倍。其他加速效应包括布朗平流和表面反应性增强,后者是由于带电稳定层的屏蔽作用,其作用可以忽略不计。稳定层增加迂回度和颗粒聚集所产生的减速效应也可以忽略不计。当 dp ≤ 30 nm 时,静电斥力主导了传质。这一发现表明,调整稳定层的电荷和扭曲度以增强通量将有助于纳米悬浮液的工程设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mass transfer to a nanoelectrocatalyst

There are few studies of mass transfer to nanospheres (1 nm ≤ dp ≤ 100 nm). We have experimentally investigated the electrocatalytic reduction of hexacyanoferrate (III) to hexacyanoferrate (II) on gold nanospheres. The surface flux is insensitive to particle sizes of dp ≥ 30 nm and is essentially identical to that for a diffusion-limited system. However, the measured fluxes in the range 5 nm ≤ dp ≤ 30 nm were one to three orders of magnitude smaller than predicted by a purely diffusion-limited model. Using mathematical modeling, we evaluated six mechanisms affecting mass transfer to a nanoparticle in our experimental system. Among potential acceleratory effects, the curvature effect sharply increased the surface flux by a factor of 20. Other acceleratory effects of Brownian advection and enhanced surface reactivity played negligible roles, the latter due to screening by a charged stabilizing layer. Deceleratory effects of increased tortuosity by stabilizing layers and particle aggregation also played negligible roles. Electrostatic repulsion dominated mass transfer for dp ≤ 30 nm. This finding suggests tuning the charge and the tortuosity of the stabilizer layer to potentiate the flux will be useful in engineering nanosuspensions.

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来源期刊
AIChE Journal
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.
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