Manganese Oxides (Mn₃O₄ & α‐MnO₂) as Co‐catalysts in Pd‐Based Nanomaterials for the Ethylene Glycol Electro‐Oxidation.

Abstract

Incorporation of α‐MnO2 and Mn3O4 during the synthesis of Pd nanoparticles promoted better particle anchoring. Especially the Mn single spinel (Mn3O4) decreased the Pd particle size from ∼10 nm (obtained for Pd/C and Pd/α‐MnO2) to 4.4 nm. HR‐TEM and XPS analysis confirmed electronic changes from a better interaction between Pd and Mn3O4, decreasing the energy barriers for alcohol oxidation, obtaining the lowest apparent activation energy (15.54 kJ mol−1) and resistance to charge transfer (1.44 Ω cm2). The Pd/Mn3O4/C electrocatalyst displayed a current density of 334.74 mA cm−2 at 2 M EG+2 M KOH with an onset potential of −0.32 V vs. NHE. This current density was 2.2 and 3.6‐fold higher than that obtained using Pd/C and Pd/α‐MnO2/C. Further tests using sorbitol and glycerol as fuels revealed that maximum current densities of 255.2 and 472.9 mA cm−2 can be achieved.

Pd/NiMoO4/NF electrocatalysts for the efficient and ultra-stable synthesis and electrolyte-assisted extraction of glycolate

“…(Supplementary Fig. 27) [20][21][22]24,27,32,[36][37][38][39][40][41][42][43][44] . In contrast, during cyclic electrolysis, Pd/NF catalyst shows a much lower FE toward glycolic acid (87-88%), accompanied by quick decays of the current density, indicating the critical role of NiMoO 4 in enhancing the selectivity and stability towards EGOR (Supplementary Fig.…”