Pt-Based Nanostructures for Electrochemical Oxidation of CO: Unveiling the Effect of Shapes and Electrolytes

Abstract

Direct alcohol fuel cells are deemed as green and sustainable energy resources; however, CO-poisoning of Pt-based catalysts is a critical barrier to their commercialization. Thus, investigation of the electrochemical CO oxidation activity (COOxid) of Pt-based catalyst over pH ranges as a function of Pt-shape is necessary and is not yet reported. Herein, porous Pt nanodendrites (Pt NDs) were synthesized via the ultrasonic irradiation method, and its CO oxidation performance was benchmarked in different electrolytes relative to 1-D Pt chains nanostructure (Pt NCs) and commercial Pt/C catalyst under the same condition. This is a trial to confirm the effect of the size and shape of Pt as well as the pH of electrolytes on the COOxid. The COOxid activity and durability of Pt NDs are substantially superior to Pt NCs and Pt/C in HClO4, KOH, and NaHCO3 electrolytes, respectively, owing to the porous branched structure with a high surface area, which maximizes Pt utilization. Notably, the COOxid performance of Pt NPs in HClO4 is higher than that in NaHCO3, and KOH under the same reaction conditions. This study may open the way for understanding the COOxid activities of Pt-based catalysts and avoiding CO-poisoning in fuel cells.

Ternary PdNiO nanocrystals-ornamented porous CeO2/onion-like carbon for electrooxidation of carbon monoxide: unveiling the effect of supports and electrolytes

“…[17][18][19][20] Electrochemical CO oxid is predominantly preferred to thermal CO oxid , owing to its low energy/power consumption, high stability, and selectivity. [21][22][23][24] Hence, electrochemical CO oxid necessitates electrocatalysts that are tolerant to CO poisoning and convert it to useful products. Amongst the most sought-after electrocatalysts, palladium (Pd) is highly active and durable for CO oxid electrocatalysis, due to the quick CO activation/adsorption and O 2 dissociation energies at low overpotential.…”

Unravelling the Alloy Effect of Porous Binary Pd-Based Nanostructures on Electrocatalytic Oxidation of Carbon Monoxide in Different Electrolytes

“…To this end, alcoholic fuel cells (i.e., ethanol, ,, methanol, , and glucose) are deemed green and efficient energy sources with inferior emissions, but the poisoning of anodes by CO-intermediate species is one of the main barriers to their practical usage. Thereby, the carbon monoxide oxidation (CO Oxid ) is a core reaction in various industrial, fundamental, and environmental remediation. − The CO Oxid is carried out through thermal, photo-process, and electrochemical, and driven by various catalysts, which necessitates the need to find effective catalysts for the CO Oxid . ,− The electrochemical approach is one of the most green and promising because it occurs at room temperature and low energy, but it requires an active and durable electrocatalyst with excellent tolerance to CO poisoning. , …”

Pd nanocrystals encapsulated in MOF-derived Ni/N-doped hollow carbon nanosheets for efficient thermal CO oxidation: unveiling the effect of porosity

“…20 Therefore, carbon monoxide oxidation (CO Oxid ) is of particular interest in various fields, including but not limited to energy conversion/production, environmental, and industrial applications. 5,[21][22][23] The CO Oxid is driven by catalysts (i.e., noble-metal-based, metal oxidebased, and carbon-based) through electrochemical, photochemical, and thermal processes, 21,[24][25][26][27] which varied in their efficacy and productivity; however, the thermal process is the main method in practical applications.…”