Platinum Porous Nanosheets with High Surface Distortion and Pt Utilization for Enhanced Oxygen Reduction Catalysis

2019 ◽  
Vol 29 (45) ◽  
pp. 1904429 ◽  
Author(s):  
Yonggang Feng ◽  
Bolong Huang ◽  
Chengyong Yang ◽  
Qi Shao ◽  
Xiaoqing Huang
Keyword(s):  
Oxygen Reduction ◽  
High Surface ◽  
Surface Distortion ◽  
Porous Nanosheets ◽  
Pt Utilization

High surface area mesoporous LaFexCo1−xO3 oxides: synthesis and electrocatalytic property for oxygen reduction

2013 ◽  
Vol 42 (26) ◽  
pp. 9448 ◽  
Author(s):  
Yongxia Wang ◽  
Xiangzhi Cui ◽  
Yongsheng Li ◽  
Lisong Chen ◽  
Zhu Shu ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Electrocatalytic Property

scholarly journals Influence of Nanocrystalline Palladium Morphology on Alkaline Oxygen Reduction Kinetics

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 566 ◽  
Author(s):  
Eliran Hamo ◽  
Avichay Raviv ◽  
Brian A. Rosen
Keyword(s):  
Oxygen Reduction ◽  
High Surface ◽  
Reduction Reaction ◽  
Membrane Electrode ◽  
X Ray Diffraction ◽  
Rotating Disc ◽  
Force Microscopy ◽  
Atomic Force ◽  
Orr Kinetics ◽  
Disc Electrodes

The structure sensitivity of the alkaline oxygen reduction reaction (ORR) on palladium is of great interest as cost considerations drive the need to find a replacement for platinum catalysts. The kinetics of alkaline ORR were investigated on nanocrystalline palladium (Pd) films with domain sizes between 14 and 30 nm that were synthesized by electrodeposition from aqueous electrolytes. Ten Pd films were prepared under varying electrodeposition parameters leading to each having a unique texture and morphology. The sensitivity of initial alkaline ORR kinetics to the Pd surface structure was evaluated by measuring the kinetic current density and number of electrons transferred for each film. We show through scanning electron microscopy (SEM), x-ray diffraction (XRD), atomic force microscopy (AFM), and voltammetry from rotating disc electrodes (RDEs) that the fastest alkaline ORR kinetics are found on Pd surfaces with high surface roughness, which themselves are composed of fine grains. Such a study is useful for developing membrane electrode assemblies (MEAs) based on directly electrodepositing catalyst onto a conductive diffusion layer.

scholarly journals Mesoporous Nanocast Electrocatalysts for Oxygen Reduction and Oxygen Evolution Reactions

Inorganics ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 98 ◽  
Author(s):  
Tatiana Priamushko ◽  
Rémy Guillet-Nicolas ◽  
Freddy Kleitz
Keyword(s):  
Oxygen Reduction ◽  
High Activity ◽  
Oxygen Evolution ◽  
Noble Metal ◽  
Noble Metals ◽  
Low Cost ◽  
High Surface ◽  
Clean Energy ◽  
Production Costs ◽  
Synthesis Methods

Catalyzed oxygen evolution and oxygen reduction reactions (OER and ORR, respectively) are of particular significance in many energy conversion and storage processes. During the last decade, they emerged as potential routes to sustain the ever-growing needs of the future clean energy market. Unfortunately, the state-of-the-art OER and ORR electrocatalysts, which are based on noble metals, are noticeably limited by a generally high activity towards one type of reaction only, high costs and relatively low abundance. Therefore, the development of (bi)functional low-cost non-noble metal or metal-free electrocatalysts is expected to increase the practical energy density and drastically reduce the production costs. Owing to their pore properties and high surface areas, mesoporous materials show high activity towards electrochemical reactions. Among all synthesis methods available for the synthesis of non-noble mesoporous metal oxides, the hard-templating (or nanocasting) approach is one of the most attractive in terms of achieving variable morphology and porosity of the materials. In this review, we thus focus on the recent advances in the design, synthesis, characterization and efficiency of non-noble metal OER and ORR electrocatalysts obtained via the nanocasting route. Critical aspects of these materials and perspectives for future developments are also discussed.

scholarly journals Surface distortion as a unifying concept and descriptor in oxygen reduction reaction electrocatalysis

2018 ◽  
Vol 17 (9) ◽  
pp. 827-833 ◽  
Author(s):  
Raphaël Chattot ◽  
Olivier Le Bacq ◽  
Vera Beermann ◽  
Stefanie Kühl ◽  
Juan Herranz ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Surface Distortion

scholarly journals Poly (3, 4-ethylene dioxythiophene) Supported Palladium Catalyst prepared by Galvanic Replacement Reaction for Methanol Tolerant Oxygen Reduction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Pandia Rajathi M ◽  
Sheela Berchmans
Keyword(s):  
Oxygen Reduction ◽  
Direct Methanol Fuel Cells ◽  
High Surface ◽  
High Surface Area ◽  
Cost Effective ◽  
Reduction Reaction ◽  
Partial Substitution ◽  
Galvanic Replacement ◽  
Potential Cycling ◽  
Electrochemical Approach

AbstractHerein, we propose a facile electrochemical approach for the synthesis of Pd loaded poly 3, 4-ethylenedioxythiophene (PEDOT) electrodeposited on glassy carbon electrode (GCE) resulting in high surface area. The catalyst preparation is initiated with EDOT polymerization on GCE surface by electrochemical potential cycling method, followed by the electrodeposition of Cu from a 2 mM solution of CuSO4 in 0.1 M NaClO4 at a constant potential of +0.34 V vs. SHE in the form of Cu nanocubes on the PEDOT surface. Pd-PEDOT catalyst was then prepared by the partial substitution of copper by galvanic displacement with various concentrations of PdCl2. The prepared Pd/PEDOT electrocatalyst is found to be methanol resistant indicating its usefulness as fuel cell cathode. The prepared catalyst supports two electron transfer of oxygen reduction reaction in 0.5 M H2SO4. The effects of Pd and Cu contents and the quantity of PEDOT, mass and specific activities were studied. At a relatively low Pd loading of 0.57 ng/cm2, the Pd/PEDOT should be a cost-effective alternative cathode catalyst for direct methanol fuel cells, DMFCs. This work explains the usefulness of PEDOT as good catalyst supporting material which is prepared by an eco-friendly electrochemical route.

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