PtNi/PtIn-Skin Fishbone-Like Nanowires Boost Alkaline Hydrogen Oxidation Catalysis

Abstract

The development of high-performance platinum (Pt)-based electrocatalysts for the hydrogen oxidation reaction (HOR) is highly desirable for hydrogen fuel cells, but it is limited by the sluggish kinetics and severe carbon monoxide (CO) poisoning in alkaline medium. Herein, we explore a class of facet-selected Pt−nickel−indium fishbone-like nanowires (PtNiIn FNWs) featuring high-index facets (HIFs) of Pt 3 In skin as efficient alkaline HOR catalysts. Impressively, the optimized Pt 66 Ni 6 In 28 FNWs show the highest mass and specific activities of 4.02 A mg Pt −1 and 6.56 mA cm −2 , 2.0/2.1 and 13.9/15.6 times larger than those of commercial PtRu/C and commercial Pt/C, respectively, along with a competitive CO-tolerance ability. Specifically, they exhibit only 6.0% current density decay after 10000 s of operation and 25.7% activity loss after 2000 s in the presence of 1000 ppm of CO. Moreover, an isotope experiment and density functional theory (DFT) calculations further prove that the unique structure and synergy among Pt, Ni, and In endow these Pt 66 Ni 6 In 28 FNWs with an optimized hydrogen binding energy (HBE) and an advantageous hydroxide binding energy (OHBE), giving them excellent alkaline HOR properties. The combined construction of surface-skin and HIFs in PtNiIn FNWs will offer an available method to realize the potential applications of advanced non-PtRu-based catalysts in fuel cells and beyond.

Atomic Diffusion Engineered PtSnCu Nanoframes with High‐Index Facets Boost Ethanol Oxidation

“…As shown in the XRD pattern of Pt 47 Sn 12 Cu 41 , the peak fitting result reveals the co-existence of fcc PtSnCu diffraction peak at 40.5 degree and fcc PtCu diffraction peak at 41.8 degree, corresponding to the lattice spacing of 2.23 Å and 2.18 Å, respectively. [17] These results could be attributed to the local formation of fcc PtSnCu alloy with expanded lattice spacings where the Sn atoms diffuse, and the fact that Sn has a larger atomic radius (140 pm) than Cu (128 pm). [18,19] The diffraction peak (2𝜃 = 24.9°) assigned to hcp PtSn intermetallic (PDF#25-0614) is newly formed when the content of Sn increases to 19%, and the initial Pt 41 Cu 59 nanocrystals are fully transformed into hcp PtSn intermetallic nanoframes in the presence of a trace amount of Cu when the content of Sn further increases to 45% (Figures S16 and S17, Supporting Information).…”

Recent advances of doping strategy for boosting the electrocatalytic performance of two-dimensional noble metal nanosheets

“…The group of Wang synthesized PdAgAu alloy NWs using the one-pot synthesis, it exhibited excellent EOR catalytic activity and stability in an alkaline environment compared with PdAgAu NPs [34]. In figures 2(g)-(i), Bu presented a class of facet-selected Pt−nickel−indium fishbone-like nanowires (PtNiIn FNWs) featuring high-index facets (HIFs) of Pt 3 In skin as efficient alkaline HOR catalysts [46].…”

Engineering ultrafine PtIr alloy nanoparticles into porous nanobowls via a reactive template-engaged assembly strategy for high-performance electrocatalytic hydrogen production

“…In this context, it is imperative to design low-Pt-based catalysts without compromising their reactivity. 5–7 Accordingly, tremendous efforts have been ceaselessly devoted to optimizing the electrocatalytic performance of Pt-based catalysts with high atom utilization efficiency and intrinsic activity by means of various strategies such as elemental composition tuning, manipulation of nano-architectures, hybridization with supports, and combination of these aforementioned approaches. 8–10 Despite considerable achievements, the overall catalytic performance of Pt-based catalysts toward widespread commercialization remains unsatisfactory, which therefore necessitates the further improvement of activity, selectivity, and durability based on the deliberate control over the electronic structure and geometrical arrangement.…”