Seed-mediated synthesis of Au@PtCu nanostars with rich twin defects as efficient and stable electrocatalysts for methanol oxidation reaction

Abstract

We present a seed-mediated approach to generate Au@PtCu nanostars with a five-fold twinned structure. The Au@PtCu nanostars exhibited better electrocatalytic properties in terms of activity and stability toward MOR relative to commercial Pt/C.

Enhanced Methanol Electrooxidation over Defect-rich Pt-M (M = Fe, Co, Ni) Ultrathin Nanowires

“…In particular, Pt 84 Fe 16 UNWs show the highest mass activity (466.0 mA mg –1 ) and specific activity (0.968 mA cm –2 ), which is 3.06 and 2.26 times those of Pt UNWs (152.3 mA mg –1 ; 0.428 mA cm –2 ), respectively. What’s more, Pt 84 Fe 16 UNWs perform with superior performance compared to a variety of previously reported Pt catalysts − in acidic environments for MOR, as listed in Figure e. According to the aforementioned XPS and EDS results, it appears that the higher activity is highly linked to the composition.…”

“…Comparation of the MOR performance of the Pt 84 Fe 16 , Pt 91 Co 9 , Pt 94 Ni 6 , and Pt UNWs. (a) CV curves in 0.5 M H 2 SO 4 + 1.0 M methanol mixed solution; (b) mass activities; (c) specific activities; (d) bar chart comparation of mass activities and specific activities of these four catalysts; (e) comparison of mass activity for Pt 84 Fe 16 UNWs with various Pt catalysts previously reported − in acidic medium; and (f) comparation of the I f / I b values.…”

Engineering PtCu nanoparticles for a highly efficient methanol electro-oxidation reaction

“…The introduced Cu can considerably decrease the adsorption energy of intermediate species on platinum and reduce the oxidation potential of carbon monoxide. 32–34 Furthermore, PtCu NPs with various morphologies, such as cubes, cages, dendrites, wires, octahedrons, frames and mesoporous structures, 35–41 have been synthesized to modulate the exposed crystal planes and atomic arrangements and, hence, to influence their performance for the MOR. However, it is noteworthy that the oxidation and dissolution of the Cu in PtCu nanostructures in acid media under corrosive MOR conditions are great challenges.…”

PdPtRu nanocages with tunable compositions for boosting the methanol oxidation reaction

“…Recently, tremendous efforts have been devoted to exploiting Pt-based nanocrystals through various strategies such as composition optimization, shape control, and structure design. [13][14][15][16][17] Combining Pt with other cheap metals to form binary or multimetallic alloys is considered as a promising method to improve the utilization efficiency of Pt, and thus reduce the loading of Pt as well. Simultaneously, the introduction of a second metal is demonstrated to tune the electron structure of Pt, thereby improving the activity and durability of Pt-based electrocatalysts.…”