Facile Room-Temperature Synthesis of a Highly Active and Robust Single-Crystal Pt Multipod Catalyst for Oxygen Reduction Reaction

Abstract

Economical production of highly active and robust Pt catalysts on a large scale is vital to the broad commercialization of polymer electrolyte membrane fuel cells. Here, we report a low-cost, one-pot process for large-scale synthesis of single-crystal Pt multipods with abundant high-index facets, in an aqueous solution without any template or surfactant. A composite consisting of the Pt multipods (40 wt %) and carbon displays a specific activity of 0.242 mA/cm2 and a mass activity of 0.109 A/mg at 0.9 V (versus a reversible hydrogen electrode) for oxygen reduction reaction, corresponding to ∼124% and ∼100% enhancement compared with those of the state-of-the-art commercial Pt/C catalyst (0.108 mA/cm2 and 0.054 A/mg). The single-crystal Pt multipods also show excellent stability when tested for 4500 cycles in a potential range of 0.6–1.1 V and another 2000 cycles in 0–1.2 V. More importantly, the superior performance of the Pt multipods/C catalyst is also demonstrated in a membrane electrode assembly (MEA), achieving a power density of 774 mW/cm2 (1.29 A/cm2) at 0.6 V and a peak power density of ∼1 W/cm2, representing 34% and 20% enhancement compared with those of a MEA based on the state-of-the-art commercial Pt/C catalyst (576 and 834 mW/cm2).

S-doped AuPd aerogels as high efficiency catalysts for the oxygen reduction reaction by balancing the ratio between bridging S22− and apical S2− ligands

“…Moreover, the presence of plenty of lattice defects in the AuPd-S B67A33 aerogels can generate compressive strain in the lattice, which should enhance their specic activity. 29,[69][70][71] Therefore, combining their higher specic activity with higher ECSA, AuPd-S B67A33 aerogels should also possess higher mass activity. 15,72 Consequently, their ORR activity in terms of mass activity and specic activity at 0.9 V (vs. RHE) was also compared (Fig.…”

Controlled Preparation and Anti‐Sulfate Electrocatalysis of Self‐Assembled Multidimensional PtZn Quasi‐Cubic Nanodendrites

“…[ 16–24 ] Particular PtA‐NSs with rough surfaces can contain more high‐index facets related to active sites which would extremely improve the catalytic activity. [ 25–32 ] Nowadays, a great number of researches pay close attention to bimetallic PtM‐NSs (M = Fe, Co, Ni, Cu, etc.) catalysts due to the electronic modulation of structures from the introducing a non‐noble metal component M and the high atom utilization.…”

Anchored Pt-Co Nanoparticles on Honeycombed Graphene as Highly Durable Catalysts for the Oxygen Reduction Reaction

“…Proton exchange membrane fuel cells (PEMFCs) have attracted widespread attention in recent years, which is ascribed to direct conversion of chemical energy into electrical energy, generation of high power density, and low pollution of the environment. However, the large-scale application of PEMFCs faces challenges to realize immediately since Pt-based catalysts as core components are scarce and cost-intensive. − In recent years, more research studies have focused on creating a novel catalyst system with high performance and a low content of platinum group metal, including Pt intermetallic catalysts, − shape-controlled Pt catalysts, − and platinum-free systems. − Another direction related to the carrier material governs the dispersion of platinum and oxidation resistance of the catalyst since the corrosion of the carrier causes the shedding of precious metals and catalyst deactivation. , Therefore, the physical and chemical properties of the carrier are effective in decreasing the cost of platinum and enhancing the durability of catalysts.…”