Boosted formic acid electro-oxidation on platinum nanoparticles and “mixed-valence” iron and nickel oxides

Al-Qodami, B. A., S. Y. Sayed, H. H. Alalawy, I. M. Al-Akraa, N. K. Allam, and A. M. Mohammad, "Boosted formic acid electro-oxidation on platinum nanoparticles and “mixed-valence” iron and nickel oxides", RSC Advances, vol. 13, issue 30: Royal Society of Chemistry, pp. 20799 - 20809, 2023.


The modification of Pt nanoparticles (nano-Pt, assembled electrochemically onto a glassy carbon (GC) substrate) with hybrid multivalent nickel (nano-NiOx) and iron (nano-FeOx) oxide nanostructures was intended to steer the mechanism of the formic acid electro-oxidation (FAO) in the desirable dehydrogenation pathway. This binary modification with inexpensive oxides succeeded in mediating the reaction mechanism of FAO by boosting reaction kinetics “electron transfer” and amending the surface geometry of the catalyst against poisoning. The sequence of deposition was optimized where the a-FeOx/NiOx/Pt/GC catalyst (where “a” denotes a post-activation step for the catalyst at −0.5 V in 0.5 mol L−1 NaOH) reserved the best hierarchy. Morphologically, while nano-Pt appeared to be spherical (ca. 100 nm in average diameter), nano-NiOx appeared as flowered nanoaggregates (ca. 56 nm in average diameter) and nano-FeOx (after activation) retained a plate-like nanostructure (ca. 38 nm in average diameter and 167 nm in average length). This a-FeOx/NiOx/Pt/GC catalyst demonstrated a remarkable catalytic efficiency (125 mA mgPt−1) for FAO that was ca. 12.5 times that of the pristine Pt/GC catalyst with up to five times improvement in the catalytic tolerance against poisoning and up to −214 mV shift in the FAO's onset potential. Evidences for equipping the a-FeOx/NiOx/Pt/GC catalyst with the least charge transfer resistance and the highest stability among the whole investigated catalysts are provided and discussed. © 2023 The Royal Society of Chemistry.


Cited By :2Export Date: 12 June 2024CODEN: RSCACCorrespondence Address: Sayed, S.Y.; Chemistry Department, Egypt; email: Address: Mohammad, A.M.; Chemistry Department, Egypt; email: details: Faculty of Science, Cairo UniversityFunding text 1: This work was supported by the Faculty of Science at Cairo University.References: Sun, Y., Huang, B., Li, Y., Qin, Y., Fu, Z., Sun, M., Wang, L., Guo, S., (2021) Fundam. Res., 1, pp. 453-460;Luo, W., Jiang, Y., Wang, M., Lu, D., Sun, X., Zhang, H., (2023) RSC Adv., 13, pp. 4803-4822;
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