Unconventional applications of the magnetohydrodynamic effect in electrochemical systems

Perspectives of Magnetically Enhanced Electroconversion of CO2 to Formic Acid and Formate

“…ERCO 2 to formic acid/formate can be enhanced via two magnetically induced phenomena, namely, the MHD effect and the regulation of the radical pair spin states. , More specifically, the MHD effect lies in the generation of convective flow by applying magnetic fields, which results in the alleviation of mass transport limitations in electrochemical cells. , On the other hand, the stabilization of radical pair spin states through the application of magnetic fields can promote the electrochemical reactions toward the target product, thus boosting ERCO 2 . Thereby, the conversion of CO 2 to formic acid/formate can be enhanced by applying a magnetic field. , Hence, while the MHD effect promotes the availability of active species in the electrode vicinity, the regulation of the radical pair spin states improves the yield of the desired product, as depicted in Figure . ,, In this section, the fundamentals of the above-mentioned approaches, namely, the MHD effect and the regulation of the radical pair spin states, will be introduced, and their potential for enhancing ERCO 2 to formic acid/formate will be discussed.…”

“…31,60 Hence, while the MHD effect promotes the availability of active species in the electrode vicinity, the regulation of the radical pair spin states improves the yield of the desired product, as depicted in Figure 2. 34,61,62 In this section, the fundamentals of the abovementioned approaches, namely, the MHD effect and the regulation of the radical pair spin states, will be introduced, and their potential for enhancing ERCO 2 to formic acid/formate will be discussed.…”

Self-Sustained Rotation of Lorentz Force-Driven Janus Systems

“…This leads to the formation of a well-defined macromagnetohydrodynamic flux on its surface. Although this well-known phenomenon, the so-called MHD effect, − has been extensively explored for electrodeposition, electrocatalysis, and microfluidics, , its use for the development of more sophisticated dynamics is still a challenge. In this work, we have employed such a macro-MHD flow, produced at each extremity of a self-electrophoretic device, to design Lorentz force-driven self-propelled rotors.…”

Magnetic field-enhanced redox chemistry on-the-fly for enantioselective synthesis

“…in electrocatalysis and electrodeposition of metals and polymers.29-31 Furthermore, due to the possibility to control the fluid flow around the electrode surface, this concept has been also extended to redox magnetohydrodynamic microfluidics and self-propulsion of active matter. [31][32][33][34] Recently, the synergy between the spontaneous ion flux produced by self-electrophoretic swimmers and an external magnetic field was proposed as an interesting alternative to boost their propulsion speed by up to 2 orders of magnitude.35 These Lorentz force-driven Janus swimmers exhibit a predictable clockwise or anticlockwise rotational motion as a function of the magnetic field orientation. The concept is complementary to already well-studied magnetic field-driven swimmers, where motion is triggered either by a pulling mechanism or rotating/undulating magnetic fields.…”

“…in electrocatalysis and electrodeposition of metals and polymers. [29][30][31] Furthermore, due to the possibility to control the uid ow around the electrode surface, this concept has been also extended to redox magnetohydrodynamic microuidics and self-propulsion of active matter. [31][32][33][34] Recently, the synergy between the spontaneous ion ux produced by self-electrophoretic swimmers and an external magnetic eld was proposed as an interesting alternative to boost their propulsion speed by up to 2 orders of magnitude.…”