Magnetic fields enhance mass transport during electrocatalytic reduction of CO2
Magnetic fields enhance mass transport during electrocatalytic reduction of CO2
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DOI：
10.1016/j.checat.2022.01.023
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Mohamad S. Kodaimati;Rui Gao;Samuel E. Root;G. Whitesides
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文献类型：
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作者：
Mohamad S. Kodaimati;Rui Gao;Samuel E. Root;G. Whitesides
电催化还原二氧化碳(CDR)的选择性不仅取决于催化剂的本征反应活性，还取决于反应物向催化剂的传递(即传质)。目前增加CDR传质的方法依赖于(1)机械搅拌或(2)气体扩散电极的使用，不能完全消除浓差极化。这项工作表明，与离子流垂直的磁场(即洛伦兹力)可以通过在流体中产生对流来增加CDR过程中的质量传递，从而改变CDR的观察到的选择性。这种传质的增加导致了电流密度的相应增加(比无场或搅拌的类似体系高1.3倍)，并增加了CDR相对于析氢反应的选择性(比无场或搅拌的体系高2.5倍)。
The selectivity of electrocatalytic reduction of CO2(CDR) is dictated not only by the intrinsic reactivity of the catalyst but also by the transport of reactants to the catalyst (i.e., mass transport). Current methods for increasing mass transport in CDR rely upon either (1) mechanical agitation or (2) use of gas-diffusion electrodes and are unable to eliminate concentration polarization completely. This work demonstrates that magnetic fields orthogonal to the ionic current (i.e., the Lorentz force) can be used to increase mass transport during CDR by generating convective flow in the fluid, thus modifying the observed selectivity of CDR. This increase in mass transport leads to a corresponding increase in current densities (up to 1.3× higher than the analogous system with no-field or agitation) and increased selectivity of CDR relative to the hydrogen evolution reaction (up to 2.5× higher than the system with no-field or agitation).