Advances in Ceramic Supports for Polymer Electrolyte  Fuel Cells

Lori, Oran; Elbaz, Lior

doi:10.3390/catal5031445

Cited by 74 publications

(37 citation statements)

References 122 publications

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“…Nobel metal catalysts, such as Pt and Pd, have demonstrated outstanding ORR activities at low temperatures in fuel cells, yet do not favor the scalable application on account of the limited availability and high cost . In this regard, nonprecious AMOs with good mechanical properties, thermal stability, and chemical corrosion resistance are reported to enhance the activity and durability of the fuel cells . For instance, an amorphous layer of CeO x on Pt surface was evidenced to inhibit the oxidation process occurring on the Pt surface, which cooperatively improves the ORR activity .…”

Section: Amo As Electrocatalyst For Energy Conversion and Storagementioning

confidence: 99%

Research Advances of Amorphous Metal Oxides in Electrochemical Energy Storage and Conversion

Yan

Abhilash

Tang

et al. 2018

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232

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possess lower hardness, higher strength, higher elasticity, higher tensile strength, lower internal energy, higher interatomic forces, lower viscosity coefficient, larger surface area, higher chemical stability, and strong corrosion resistance compared with their crystalline counterparts. [1][2][3] Based on the anionic constituents, amorphous materials could be categorized as oxides, sulfides, phosphates, etc. Among them, amorphous metal oxide family is of great importance owing to its widespread applications in a variety of areas such as batteries, supercapacitors, electronics, conducting films, multilayered transistors, electrochromic displays, nonvolatile memories, and the like. [4][5][6] As the basic building blocks, metaloxide (M-O) polyhedra are responsible for the essential features of the electronic band structure in amorphous metal oxides (AMOs). [3] AMO materials differ from their crystalline counterparts in the arrangement of M-O polyhedra, in which a random network arrangement of distorted polyhedra with short-range ordering is presented rather than maintaining perfect periodicity. [7,8] The coordination number of the M-O polyhedra, namely, the number of anions bonded to the metal cation, constitutes a crucially decisive factor for the unique properties of AMOs. Multiple polyhedra are interconnected through different types of sharing configurations known as edge sharing, corner sharing, and face sharing of the oxygen atoms. The combination of different sharing geometries also affects the properties of AMOs. [9] In other words, AMOs are formed by the superposition of the distorted M-O polyhedra to form network arrays through a random package. Long-range structural disorder in the AMO reduces scattering mean free path, and the lack of grain boundaries makes the electronic properties identical within large areas. These unique characteristics make them suitable for flexible electronics such as flexible films, intervening layers, thin film transistors, etc. [10][11][12] In recent years, there are numerous reports pointing out the advantages of AMOs over the crystalline counterparts in many electrochemical applications. [13][14][15][16][17] For example, the inherent disorderliness in the structural arrangement and rich defects are evidenced to be highly constructive to improve the alkali ion diffusion through the lattice. [18,19] As for intercalation-type electrodes in lithium-ion batteries (LIBs), amorphous materials Amorphous metal oxides (AMOs) have aroused great enthusiasm across multiple energy areas over recent years due to their unique properties, such as the intrinsic isotropy, versatility in compositions, absence of grain boundaries, defect distribution, flexible nature, etc. Here, the materials engineering of AMOs is systematically reviewed in different electrochemical applications and recent advances in understanding and developing AMO-based high-performance electrodes are highlighted. Attention is focused on the important roles that AMOs play in various energy storage and conversion technologies...

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Section: Amo As Electrocatalyst For Energy Conversion and Storagementioning

confidence: 99%

Research Advances of Amorphous Metal Oxides in Electrochemical Energy Storage and Conversion

Yan

Abhilash

Tang

et al. 2018

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232

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“…Lori and Elbaz summarized the latest studies on ceramic supports including carbides [25], oxides, nitrides, borides, and some composite materials [26]. Alternative carbon supports including carbon nanotubes, ordered mesoporous carbon, and colloid imprinted carbon were reviewed by Banham et al [27].…”

Section: This Special Issuementioning

confidence: 99%

Electrocatalysis in Fuel Cells

Shao

2015

Catalysts

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“…[ 4 ] This class of catalysts allows relatively high utilization of the catalytically active metal sites when compared to metal nanoparticles. [ 5 ] In FC cathodes, these catalysts are usually incorporated in carbon‐based supports with good conductivity and high surface area.…”

Section: Introductionmentioning

confidence: 99%

Bipyridine Modified Conjugated Carbon Aerogels as a Platform for the Electrocatalysis of Oxygen Reduction Reaction

Peles-Strahl

Zion

Lori

et al. 2021

Adv Funct Materials

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Aerogels offer a great platform for heterogeneous electrocatalysis owing to their high surface area and porosity. Atomically dispersed transition metal ions can be imbedded in these platforms at ultra‐high site density to make them catalytically active for various reactions. Herein, the synthesis of a new class of conjugated microporous organic aerogels that are used as covalent 3D frameworks for the electrocatalysis of oxygen reduction reaction (ORR) is reported. Modified aerogels functionalized with bipyridine ligands enable copper ion complexation in a single‐step synthesis. The aerogels’ structures are fully characterized using a wide array of spectroscopic and microscopic methods, and heat‐treated in order to make them electronically conductive. After heat treatment at 600 °C, the aerogels maintained their macrostructure and became active ORR catalysts in alkaline environment, showing high mass activity and ultra‐high site density.

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Advances in Ceramic Supports for Polymer Electrolyte Fuel Cells

Cited by 74 publications

References 122 publications

Research Advances of Amorphous Metal Oxides in Electrochemical Energy Storage and Conversion

Research Advances of Amorphous Metal Oxides in Electrochemical Energy Storage and Conversion

Electrocatalysis in Fuel Cells

Bipyridine Modified Conjugated Carbon Aerogels as a Platform for the Electrocatalysis of Oxygen Reduction Reaction

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