Unveiling the role of oxygen vacancy of manganese oxide coating on Ni foam to magnetocaloric catalytic oxidation of toluene.

Using a pulsed-voltage technique, the manganese oxide (MnO) coating on Ni foam (NF) was regulated to encourage magnetocaloric oxidation, which lowers volatile organic compounds (VOCs). The MnO/NF was obtained by electrodeposition of MnO onto NF. Subsequently, MnO/NF-PV was obtained by pulsed-voltage modification. According to the structural characterization, the pulsed-voltage modification changed the interaction between the coating and the support, resulting in increased toluene adsorption capacity, oxygen desorption capability, oxygen vacancy (O) quantity of MnO/NF-PV. The MnO/NF-PV exhibits excellent catalytic performance, with a 90 % conversion of toluene at 170 °C, where O play an important role as electronic intermediates in magnetocaloric oxidation reactions. Furthermore, compared to traditional thermal catalysis, electromagnetic induction heating (EMIH) can promote the reactivity of O in magnetocaloric catalysts by increasing the activation and dissociation of oxygen species and thus catalytic activity, which was demonstrated in the O isotope exchange experiment.