CoPt Nanowires with Low Pt Content for the Catalytic Methanol Oxidation Reaction (MOR)

Abstract

CoPt nanowires with low Pt content and optimized catalytic properties for the methanol oxidation reaction (MOR) are synthetized by electrodeposition, and their morphology and composition are investigated. By controlling the synthesis conditions, an increase in the Co concentration from 7% up to 90% is achieved, thus leading to a reduced Pt content. Saccharine was used to control the crystalline structure of the CoPt nanowires. X-ray diffraction investigations revealed that the face-centered cubic crystalline structure transforms into the hcp crystalline structure when saccharine is added into the electrochemical bath. The electrocatalytic performance of CoPt nanowires increases even though the Pt content in the samples decreases due to the change in the crystalline structure. A dramatic increase in the catalytic activity is obtained, from 10 to 85 mA cm–2 (almost two times higher than the best value reported in the literature on CoPt nanoparticles), making these nanowires the best catalyst candidates for the MOR.

Platinum-Modified Cobalt Oxide/Cobalt Nanotubes as Multifunctional Electrocatalysts in Alkaline and Acidic Conditions

“…Chronoamperometry performed at 0.7 V (Figure S7) confirms that the activity of the 60% Pt-Co NTs is higher than that of platinum over an extended period of time, which highlights the stability of the catalyst. The activities of the Pt-Co NT are comparable to results previously obtained for Pt NPs supported on RuO 2 and PtAu alloy nanowires under identical conditions by our group. , The activities measured herein are lower than those measured from 1D PtCo by other groups, but it can be difficult to compare these activities because they are measured at different scan rates and different concentrations of methanol. , …”

“…34,47 The activities measured herein are lower than those measured from 1D PtCo by other groups, but it can be difficult to compare these activities because they are measured at different scan rates and different concentrations of methanol. 48,49 The performance of the catalysts toward the OER was examined in an oxygen-saturated 0.1 M KOH solution by rotating disk electrode measurements, and the results are shown in Figure 6A. The onset potential of the OER with the Pt-Co NTs is measurably lower at all compositions relative to pure Pt NWs, suggesting more facile OER kinetics.…”

Nickel carbonate (Ni2(CO3)3) as an electrocatalyst and photo-electrocatalyst for methanol electro-oxidation

“…This has been practiced by alloying Pt with earth-abundant metals like Ni, Cu, Co and Fe. [11][12][13][14] Further, the activity of the metal catalysts is tuned in order to increase the active sites by tailoring the electronic and geometric structures and enhancing their activity. Nevertheless, Pt-alloyed catalysts face a major problem in terms of leaching of the transition metals and hence pose stability issues.…”

Regulating Competitive Adsorption on Pt Nanoparticles by Introducing Pb to Expedite Hydrogen Production via Ammonia Oxidation

“…The AOR peak current density of PtPb/C is 191.2 mA mg –1 Pt , which is about 1.97 times than that of Pt/C (96.8 mA mg –1 Pt ) (Figure b). The current attenuation starting at 0.70 V is ascribed to that the competitive adsorption of OH ad occupies the Pt sites, which is common for the oxidation reaction of small molecules such as methanol, , ethanol, , and formic acid. , The AOR activity of Pb/C is characterized by CV at 100 mV s –1 in 1.0 M KOH + 0.1 M NH 3 ·H 2 O solution. For comparison, the AOR activity of Pt/C is tested, and the CV curves of Pb/C in 1.0 M KOH solution are also acquired.…”