Study on Platinum and Copper Nanosheets Alloys Supported on Mesoporous Titanium Dioxide Doped with Carbon Black as Electrocatalysts in PEM Fuel Cells

Abstract

Platinum and copper nanosheets alloys (Pt 1-x Cu x nanosheets), prepared by the seed-mediated growth method, are deposited on mesoporous titanium dioxide (TiO 2 ) doped with carbon black by ultrasonic dispersion. The Pt 5 Cu nanosheet/carbon-TiO 2 (Pt 5 Cu NS/C-TiO 2 ) used for proton exchange membrane fuel cell (PEMFC) catalyst shows higher electrochemical surface area and exhibits better fuel cell performance than that of the commercial Pt/C catalyst. The Pt 5 Cu NS/C-TiO 2 also shows better stability than that of the commercial Pt/C when it is employed as the cathode catalyst in a single-cell fuel cell.

Metallic Two-Dimensional Nanoframes: Unsupported Hierarchical Nickel–Platinum Alloy Nanoarchitectures with Enhanced Electrochemical Oxygen Reduction Activity and Stability

“…Prior work on metal nanosheet-based catalysts have been limited to Pd−Pt−Ag nanosheets for ethanol electrooxidation, 22 Pd nanorings for hydrogenation of p-nitrophenol, 23 and Pt 1−x Cu x nanosheets deposited on titanium dioxide for ORR. 24 Within 2D materials, methods that translate planar nanosheets into 3D nanoarchitectures 25 that allow molecular accessibility to the reactive surface remains a key challenge. 26 In this work, we demonstrate the synthesis, structure, and electrochemical properties of metallic 2D nanoframes which consist of a hierarchical 2D framework composed of a highly catalytically active Pt−Ni alloy phase and an interconnected pore network.…”

“…In contrast to graphene and transition metal compound 2D structures, , relatively few studies have explored metallic nanosheet catalysts, and previous studies have not substantially explored metallic 2D ORR catalysts. Prior work on metal nanosheet-based catalysts have been limited to Pd–Pt–Ag nanosheets for ethanol electrooxidation, Pd nanorings for hydrogenation of p -nitrophenol, and Pt 1– x Cu x nanosheets deposited on titanium dioxide for ORR . Within 2D materials, methods that translate planar nanosheets into 3D nanoarchitectures that allow molecular accessibility to the reactive surface remains a key challenge …”

An interconnected-graphene enveloped titanium dioxide flower as a robust support for proton exchange membrane fuel cells

“…Among various strategies, constructing TiO 2 and carbon composites has emerged as the most effective way. The synthetic routes to composite materials can be classified into three categories: (1) a physical mixture of TiO 2 nanoparticles and carbon materials; [19][20][21][22] (2) in situ growth of TiO 2 on a carbon substrate; [23][24][25][26] and (3) composites made from pyrolysis of carbon sources and TiO 2 . [27][28][29][30] These composites have improved the electrical conductivity of TiO 2 and the electrochemical stability of carbon, demonstrating promise for application in PEMFCs.…”

The Catalytic Effect of Polypyrrole/Pt‐Cu on Oxygen Reduction Reaction

“…Platinum is the dominant catalyst used in fuel cells because of its high efficiency and stability although it is costly. Considering the cost of platinum, alloying platinum with less expensive 3d‐transitional metals like copper (Cu) has been discussed as a solution for increasing the catalytic activity along with decreasing the cost 6, 23–26. Moreover, with the aim of increasing contact surface area between catalysts and electrolyte, using catalysts in form of nanoparticles as well as using porous substrates would be considered for lowering the platinum content of cathode catalyst.…”