Screening iridium-based bimetallic alloys as catalysts for direct ethanol fuel cells

Influence of defective sites in Pt/C catalysts on the anode of direct methanol fuel cell and their role in CO poisoning: a first-principles study

“…Table 1 shows that H 2 and CO were strongly adsorbed on Pt, with adsorption energies of -1.38 eV and -2.19 eV, respectively. This is in good agreement with the findings of previous theoretical (-1.4 eV and -2.17 eV) and experimental studies [5,6,29,30]. The electron density field also supports the enhanced electronic interaction between Pt and H 2 /CO.…”

“…Unfortunately, Pt tends to be readily poisoned by carbon monoxide (CO), a reaction by-product, and thus in time becomes deactivated [4]. For this reason, many studies have focused on enhancing the catalytic activity by inhibiting the CO poisoning effect using carbon-supported binary catalysts including Pt, by means of an electronic effect or an ensemble effect [5][6][7][8][9][10][11][12][13]. Most of this research has focused on the role of the catalyst in maintaining activity.…”

Ir@Pt bimetallic overlayer catalysts for aqueous phase glycerol hydrodeoxygenation

“…The C-C bond cleavage is therefore inhibited in glycerol conversion of Ir@Pt SD compared to pure Pt, because the glycerol dehydrogenation reaction forming glyceraldehyde is more rate-limiting compared to the subsequent C-C bond cleavage from glyceraldehyde to form C 2 and C 1 compounds [39]. Moreover, Courtois et al calculated the activation energy of CHCO dissociation, which is a crucial C-C scission step in ethanol fuel cells [43]. It was determined that with Pt overlayer atop Ir, the activation energy for CHCO dissociation is increased so that C-C bond breaking is less favorable.…”

Performance evaluation of anodic nano‐catalyst for direct methanol alkaline fuel cell

“…Among them, Pt [9], Pd [10], and Pt-Ru [11] bimetallic composites are known as the suitable anode material, but they are expensive and their surfaces are poisoned by adsorption of methanol oxidation (MO) byproducts such as carbon monoxide (CO ads ) [12]. To overcome this problem, many electrocatalysts have been investigated.…”

“…To overcome this problem, many electrocatalysts have been investigated. Among them, Pt [9], Pd [10], and Pt-Ru [11] bimetallic composites are known as the suitable anode material, but they are expensive and their surfaces are poisoned by adsorption of methanol oxidation (MO) byproducts such as carbon monoxide (CO ads ) [12]. Recently, various studies on transition metal mixed oxides with a large amount of the oxygen vacancies and the excellent electrical conductivities have indicated that perovskite oxides can be utilized as electrodes in fuel cells, instead of noble metals [13,14].…”