Ultrathin Pd‐Based Perforated Nanosheets for Fuel Cells Electrocatalysis

Abstract

With intriguing physiochemical properties and widespread promising applications, ultrathin nanosheets (NSs) with only atomic thickness have drawn increasing attention. The ultrathin Pd, Pd‐based alloy and intermetallic perforated nanosheets (PNSs) have been extensively studied in fuel cells (FCs)‐related reactions, including the cathodic oxygen reduction reaction (ORR) and anodic methanol, ethanol, and formic acid oxidation reactions (MOR, EOR, and FAOR). In this review, we briefly summarize the preparation of ultrathin Pd, Pd‐based alloy and intermetallic PNSs, as well as their advantages in electrocatalytic applications including ORR, MOR, EOR, and FAOR. Finally, the major challenges and perspectives for future development of ultrathin Pd, Pd‐based alloy and intermetallic PNSs electrocatalysts are proposed to accelerate the commercialization of future promising FCs.

Wet-chemistry synthesis of two-dimensional Pt- and Pd-based intermetallic electrocatalysts for fuel cells

“…Therefore, 2D Pt-and Pd-based IMNPs and IMNSs have attracted increasing attention as potential substitutes for FC electrocatalysis by integrating multiple advantages of alloying effects, structural merits, and a stable intermetallic phase. [39][40][41][42] Several articles have reviewed the synthesis, properties, and applications of 2D Pt-and Pd-based nanomaterials. [39][40][41][42] However, a comprehensive outline of the preparation of 2D Ptand Pd-based IMNPs and IMNSs and their related applications in FCs is still lacking.…”

“…[39][40][41][42] Several articles have reviewed the synthesis, properties, and applications of 2D Pt-and Pd-based nanomaterials. [39][40][41][42] However, a comprehensive outline of the preparation of 2D Ptand Pd-based IMNPs and IMNSs and their related applications in FCs is still lacking. In this review, we first provide a fundamental understanding of the ORR, formic acid oxidation reaction (FAOR), methanol oxidation reaction (MOR), and ethanol oxidation reaction (EOR).…”

“…Therefore, 2D Pt- and Pd-based IMNPs and IMNSs have attracted increasing attention as potential substitutes for FC electrocatalysis by integrating multiple advantages of alloying effects, structural merits, and a stable intermetallic phase. 39–42…”

Facile Synthesis of the TiO2-Supported Ultrathin Palladium Facet Composite Catalyst with Superior Metal Dispersion and Enhanced Catalytic Performance in Formic Acid Electro-Oxidation

“…Recently, ultrathin 2D metals with a few atomic layer thicknesses have shown promising applications in catalysis due to their ultrathin 2D structure with unique quantum and surface effects. − For instance, the activity of 2D freestanding palladium nanosheets in formic acid electro-oxidation is much higher than that of tetrahedron/concave tetrahedron Pd nanocrystals, 1D Pd nanochains, 3D Pd nanoflowers, and commercial Pd black catalysts. , However, the stability and durability of ultrathin 2D metals still need further improvements for practical applications. If an ultrathin metal layer exposed to specific metal facets can be grown over the surface of conventional supports and form an “oxide@ultrathin metal” facet composite catalyst, it can serve as a new category of model catalyst to bridge the gaps among single-crystal metal surfaces, shape-controlled metal nanocrystal, and practical supported metal catalysts.…”

Influence of electrodeposition regime and Sn:Pd ratios in Sn-Pd electrocatalysts on ethanol oxidation reaction

“…The synthesis of bimetallic catalysts is one of the most widely investigated topics in materials science. [1][2][3][4] The obtained catalysts are playing a leading role in the development of green sources of energy in fuel cells 5,6 , batteries 7 , sensors 8 , organic synthesis 9 , photocatalysis 10 , and other applications. The commercialization of green sources is obstructed by the high costs, relatively slow electron transfer kinetics, and low stability of the conventional platinum catalysts.…”