Lanthanide electronic perturbation in Pt–Ln (La, Ce, Pr and Nd) alloys for enhanced methanol oxidation reaction activity

Abstract

Simultaneously achieving high activity and robust stability is still challenging for the direct methanol fuel cells in practical applications. Although noble metal Pt has been applied as the electrocatalyst, it...

Hexagonal PtBi Intermetallic Inlaid with Sub‐Monolayer Pb Oxyhydroxide Boosts Methanol Oxidation

“…Notably, the PtBi@6.7%Pb nanoplates exhibit the highest peak mass activity of 13.93 A mg -1 Pt , which is 4.0 and 7.4 times higher than those of PtBi nanoplates and Pt/C (Figures S11c and S12, Supporting Information), respectively, outperforming most of the advanced MOR electrocatalysts (Table S1). [47][48][49][50][51][52][53] The electrochemically active surface areas (ECSAs) of Pt/C, PtBi, and PtBi@6.7%Pb were determined by the desorption peaks of Cu upd (Figure S13, Supporting Information), as calculated to be 75.9 m 2 g -1 Pt , 38.8 m 2 g -1 Pt and 32.2 m 2 g -1 Pt , respectively. The PtBi@6.7%Pb nanoplates exhibit the highest peak specific activity of 43.32 mA cm -2 , which is 4.8 and 17.5 times higher than those of PtBi nanoplates and Pt/C, respectively (Figure S14, Supporting Information).…”

Ultrasound-mediated synthesis of nanoporous fluorite-structured high-entropy oxides toward noble metal stabilization

“…Ultrasound can be used to drive high-energy chemical reactions via the physical process of acoustic cavitation that provides a unique high-energy environment at such magnitude and timescale that is unattainable with conventional energy sources. The acoustic cavitation phenomenon is described as the formation, growth, and implosive collapse of microbubbles in liquids under ultrasound irradiation, which could be leveraged for efficient production of high entropy materials under mild conditions ( Suslick and Price, 1999 ; Zhang et al., 2021a , 2021b ). Recently, we exploited this unique high-energy environment toward the synthesis of nanostructured HEAs ( Liu et al., 2019 ; Okejiri et al., 2021 ), and high-entropy perovskite oxide nanocatalysts ( Okejiri et al., 2020 ).…”

“…High-entropy oxides (HEOs) are among the emerging new classes of compositionally complex ceramics with abundant structural diversity and peculiar functional features which makes them promising candidates in various fields of applications including heterogeneous catalysis ( Amiri and Shahbazian-Yassar, 2020 ; Rost et al., 2015 ; Sun and Dai, 2021 ; Zhang et al., 2021a , 2021b ). As a unique class of concentrated solid-solution materials, HEOs, unlike high-entropy alloys (HEAs), possess independent cation and anion sublattices that give rise to expanded tuning range in composition and structure diversity ( Chen et al., 2019 ; Sun and Dai, 2021 ).…”

Kinetic diffusion–controlled synthesis of twinned intermetallic nanocrystals for CO-resistant catalysis

“…Structurally ordered intermetallic compounds with definite composition and unique geometric and electronic effects have been extensively studied for this purpose (8)(9)(10)(11)(12)(13)(14). For example, the active site isolation concept using structurally ordered intermetallic compounds as well-defined catalysts has shown great success in selective heterogeneous catalysis (semihydrogenation and isomerization) (15) and electrocatalysis (16)(17)(18)(19)(20)(21)(22). In addition, relying on the structural template of a solid intermetallic catalyst with unique atomic arrangements and lower crystalline symmetry (23), single-walled carbon nanotubes with single chirality were realized through a specific "recognition" between catalyst and nanotube (5).…”