利用磁场加速析氧反应

doi:10.1016/S1872-2067(23)64560-7

催化学报 ›› 2023, Vol. 55: 191-199.DOI: 10.1016/S1872-2067(23)64560-7

利用磁场加速析氧反应

李晓宁^a^,^b, 郝崇琰^a, 杜雨蒙^a, 卢昀^c, 范亚蒙^a, 王明月^a, 王娜娜^a, 孟瑞晋^b, 王晓临^a, 徐梽川^b^,^*(), 程振翔^a^,^*()

^a卧龙岗大学创新校区, 澳大利亚创新材料研究所, 超导与电子材料研究所, 澳大利亚
^b南洋理工大学材料科学与工程学院, 新加坡
^c中国科学技术大学工程科学学院, 中国科学院材料力学性能与设计重点实验室, 安徽合肥230026, 中国

收稿日期:2023-09-22 接受日期:2023-11-06 出版日期:2023-12-18 发布日期:2023-12-07
通讯作者: *电子信箱: cheng@uow.edu.au (程振翔), xuzc@ntu.edu.sg (徐梽川).
基金资助:
国家自然科学基金(52102238);澳大利亚研究委员会(DP190100150)

Harnessing magnetic fields to accelerate oxygen evolution reaction

Xiaoning Li^a^,^b, Chongyan Hao^a, Yumeng Du^a, Yun Lu^c, Yameng Fan^a, Mingyue Wang^a, Nana Wang^a, Ruijin Meng^b, Xiaolin Wang^a, Zhichuan J. Xu^b^,^*(), Zhenxiang Cheng^a^,^*()

^aInstitute for Superconducting and Electronic Materials (ISEM), Australia Institute for Innovative Materials, Innovation Campus, University of Wollongong, North Wollongong 2500, NSW, Australia
^bSchool of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
^cCAS Key Laboratory of Mechanical Behavior and Design of Materials, School of Engineering Science, University of Science and Technology of China, Hefei 230026, Anhui, China

Received:2023-09-22 Accepted:2023-11-06 Online:2023-12-18 Published:2023-12-07
Contact: *E-mail: cheng@uow.edu.au (Z. Cheng), xuzc@ntu.edu.sg (Z. Xu).
Supported by:
National Natural Science Foundation of China(52102238);Australia Research Council(DP190100150)

摘要/Abstract

摘要：

无需额外的能源消耗, 利用永磁体有望克服电解水的瓶颈问题. 尽管近年来研究者在该方向付出了很多努力, 但磁场效应的潜在机制仍然不明确. 本文通过浸涂超亲水性γ-Fe₂O₃层, 使其沉积在不同的电极基底上, 并改变它们的表面润湿性和磁性, 从而成功地揭示了磁场效应的作用机制. 结果表明, 在高电流密度下, 磁场主要由额外施加在氧气气泡上的洛伦兹力和开尔文力产生, 前者决定外加磁场的几何构型, 后者则与电极的磁性密切相关. 同时, 本文还提出了通过优化磁场效应从而提高水电解整体效率的策略.

关键词: 水分解, 磁场, 气体释放, 洛伦兹力, 开尔文力

Abstract:

The challenge of overcoming the bottleneck in water electrolysis can potentially be addressed by utilizing permanent magnets without extra energy consumption, but the underlying mechanism of magnetic field effects is still puzzling despite increasing efforts in last few years. In this work, by dip-coating a superhydrophilic γ-Fe₂O₃ layer onto different electrode substrates, their surface wettability and magnetism are modified, so the ever-tangled effects of magnetic field are separated and identified. It is determined that the primary contribution of magnetic fields at the high current density was due to additional Lorentz force and Kelvin force exerted on oxygen gas bubble, with the former being dependent on the external magnetic field’s geometry and the latter closely tied to the electrodes’ magnetism. Strategies to maximize effects of magnetic field as well as the overall efficiency of water electrolysis is proposed.

Key words: Water splitting, Magnetic field, Gas release, Lorentz force, Kelvin force

李晓宁, 郝崇琰, 杜雨蒙, 卢昀, 范亚蒙, 王明月, 王娜娜, 孟瑞晋, 王晓临, 徐梽川, 程振翔. 利用磁场加速析氧反应[J]. 催化学报, 2023, 55: 191-199.

Xiaoning Li, Chongyan Hao, Yumeng Du, Yun Lu, Yameng Fan, Mingyue Wang, Nana Wang, Ruijin Meng, Xiaolin Wang, Zhichuan J. Xu, Zhenxiang Cheng. Harnessing magnetic fields to accelerate oxygen evolution reaction[J]. Chinese Journal of Catalysis, 2023, 55: 191-199.

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图/表 4

Fig. 2. OER performance of NF and γ-Fe2O3@NF and that under magnetic fields. (a) LSV curves with scan rate of 5 mV s?1 in 1 mol L?1 KOH solution without iR-correction. (b) Tafel plots converted from LSV curves. (c) Nyquist plots obtained from EIS tests at 1.6 V. (d,e) CA curves at 1.77 and 1.65 V on the NF and γ-Fe2O3@NF electrodes respectively, with an 0.4 T magnetic field applied during periods of 2nd?4th mins and 6th?8th mins. The inset shows the contact angles (θ) under a magnetic field. (f) Illustration of each setup.

Fig. 1. Surface wettability and morphology of γ-Fe2O3 and γ-Fe2O3@NF. (a) Contact angle (θ) image of bare NF (not CV-stabilized); inset is the photograph of a NF electrode. (b) Contact angle (θ) image of γ-Fe2O3@NF; inset are the photographs of a γ-Fe2O3@NF electrode, and the γ-Fe2O3 hydrosol taken one year later after preparation. (c) STEM image of γ-Fe2O3 hydrosol; inset is the size distribution. (d) HAADF image of γ-Fe2O3 hydrosol; inset is the FFT pattern. (e) SEM image of NF and the elemental mapping. (f) SEM image of γ-Fe2O3@NF and the elemental mapping.

Fig. 3. Property and performance of carbon-based electrodes under magnetic fields. (a) CA curves recorded around 70 mA cm?2 with a stirring during 2nd?4th mins and 6th?8th mins. (b) M-H loops of NF and γ-Fe2O3@NF at room temperature. (c,e,g) CA curves recorded on the γ-Fe2O3@CPaper, CPaper, and CCloth electrodes respectively, with an ~0.4 T MF applied during periods of 2nd?4th mins and 6th?8th mins (noted as Stirring when stirring instead). (d,f,h) Images of these electrodes, contact angle (θ), and M-H loops at room temperature. (i) Corresponding information of CCloth-Treated electrodes.

Fig. 4. Mechanism study on the magnetic field effects at high current density. (a) Illustration of MF induced Lorentz force (FLore) acting on the O2 gas bubble for Setup 3. (b) Simulation of the MF in air and the redistribution of MF due to the presence of Ni for Setup 2. Static force analysis on an O2 gas bubble (c) without MF, (d,e) with MF-related forces. All illustrations are the projections on the xz plane.

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利用磁场加速析氧反应

Harnessing magnetic fields to accelerate oxygen evolution reaction

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