Study on the Oxidation Enhancement of Formic Acid and Formate Blended Fuel Solution on Pt Catalyst

Abstract

The effect of [HCOOH]/[HCOONa] ratio on the oxidation activity of HOOH and HCOONa blended fuel solution on Pt nanocatalyst is studied using cyclic voltammetry, chronoamperometry, and Tafel analysis. Five electrolyte solutions with the same total concentrations of HCOOH and HCOONa but different [HCOOH]/[HCOONa] ratios are tested. Blended solutions containing both higher HCOOH and HCOONa concentrations are found to be more active than single HCOOH or HCOONa solution, with the solution containing 0.8 mol dm–3 HCOONa and 0.2 mol dm–3 HCOOH exhibiting the best activity. The reasons behind the better performance of the HCOOH and HCOONa blended solutions – such as electric conductivity, pH, concentrations of HCOOH, and HCOONa, ionic strength of the solution, and oxidation mechanism of HCOOH – are investigated. Enhanced oxidation activity of the HCOOH and HCOONa blended solution is observed to be the mutual effect of various reasons, with pH and [HCOO–] assuming the key roles.

Use of PtAu/C electrocatalysts toward formate oxidation: electrochemical and fuel cell considerations

“…Nevertheless, Beden et al [56] showed the activity of gold and platinum for the oxidation of formate. Additionally, according to Hsu et al [30], the impact of sodium formate on Pd-based materials in formic acid would be different to what has been discovered on Pt/C based on the studies of Guo et al [57] and Gao et al [10].…”

Efficient dehydrogenation of a formic acid–ammonium formate mixture over Au3Pd1 catalyst

“…[40][41][42][43][44][45] The other way to improve the activity and stability of catalysts is using new fuel systems with low acidity, high formate anion concentration and catalyst enhancement agents such as formic acid-sodium formate (FA-SF) mixture or formic acid-ammonium formate (FA-AF) mixture. [46][47][48][49][50] In a previous work, we found that the dehydrogenation performance of FA-AF mixture was even better than FA-SF mixture. The Pd/C catalyst exhibited superior catalytic activity towards FA-AF system with an initial TOF of 7959 h À1 at 323 K. However, the stability the Pd/C catalyst needs further improvement.…”

“…The higher partial reaction order of AF in eqn (3) may be ascribed to three cases. For Case I, the HCOO À with a rather higher concentration is a reactive intermediate, 46,58 and the existence of HCOO À is conducive for FA to form a "Hdown" adsorption conguration on the catalyst surface, 59,60 benecial for the dehydrogenation of FA. For Case II, HCOO À forms an equilibrium with HCOOH:…”

Highly Efficient Hydrogen Generation from a Formic Acid/Triethanolamine System Using a Pd-Based Catalyst and Correlation for Apparent Activation Energy Estimation

“…Hill and Winterbottom used electrode potential measurements to test the decomposition of FA/SF solutions by palladium catalysts, and the reaction mechanism in which SF acts as an auxiliary agent was proposed. Since then, many researchers have been devoting time to the screening of the optimum proportion of FA/additive under different catalyst systems. − Zhou et al studied the FA/ammonium formate mixture as a new system for dehydrogenation over the common Pd/C catalyst . The combination of FA and amine was investigated by Bi et al , and revealed that triethylamine (TEA) and dimethylethanolamine (DMEA) are significant for attaining excellent activity in the Au-catalyzed FA dehydrogenation process.…”