Comparison of iridium– and ruthenium–based, Pt–surface–enriched, nanosize catalysts for the oxygen–reduction reaction

Kaplan, Dima; Goor, Meital; Alon, M.; Tsizin, Svetlana; Burstein, L.; Rosenberg, Yu.; Popov, Inna; Peled, E.

doi:10.1016/j.jpowsour.2015.12.017

Cited by 24 publications

(19 citation statements)

References 25 publications

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“…Although, the Pt alloy with Ir and IrO 2 nanostructures was reported in limited aspects as a bi-functional oxygen electrocatalyst but, maintaining both good durability and activity is critical to the development and application of this bi-functional catalyst. In order to maximize the Pt utilization, the development of surface enriched Pt electrocatalysts could be the promising and logical approach where the electrocatalysis occurs at the surface of the active catalyst sites [24,42]. In addition, the preparation of Pt enriched surface with Ir nanoparticles found to be more complicated as observed from the literatures [25,29e31,35,42e44].…”

Section: Introductionmentioning

confidence: 99%

Improved bi-functional oxygen electrocatalytic performance of Pt–Ir alloy nanoparticles embedded on MWCNT with Pt-enriched surfaces

Bhuvanendran

Ravichandran

Jayaseelan

et al. 2020

Energy

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Multi-walled carbon nanotube supported PteIr nanoparticles (PteIr/MWCNT) with different elemental ratios were synthesized by one-pot co-reduction approach under ambient conditions. The PteIr catalysts exhibit improved bi-functional activity towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and its electrocatalytic performance was clearly established using different physiochemical characterization techniques. The PteIr composition of 2:1 has a higher electrochemical surface area (ECSA) of about 85.3 m 2 /g compared to other compositions (3:1 and 1:1) and Pt/MWCNT due to the effect of particle size distribution. The improved ORR/OER activity was found to be 139.4 and 740 mA/mg, respectively, for PteIr(2:1)/MWCNT with the potential difference of 760 mV for oxygen bi-functional activity. Furthermore, PteIr(2:1)/MWCNT showed much better stability for ORR compared to other compositions and Pt/MWNCT catalysts, i.e., around 76% of its initial ECSA retained with <20 mV shift in half-wave potential was obtained even after 10,000 potential cycles in acidic medium. It is believed that the Pt enriched surface, amount of Ir content, induced electronic and geometric effects play a vital role on the electrocatalytic activity enhancement of PteIr(2:1)/MWNCT as effective bi-functional oxygen electrode.

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Section: Introductionmentioning

confidence: 99%

Improved bi-functional oxygen electrocatalytic performance of Pt–Ir alloy nanoparticles embedded on MWCNT with Pt-enriched surfaces

Bhuvanendran

Ravichandran

Jayaseelan

et al. 2020

Energy

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“…As it is already known, the two‐electron reduction pathway is undesired because it is in competition with the direct four‐electron pathway; in addition, the associated production of hydrogen peroxide often represents not only an efficiency loss, but also a possible damaging factor for the device components . The ORR represents the most critical electrochemical reaction in fuel cell systems and, nowadays, noble metals represent the background materials, showing the highest catalytic activity …”

Section: Introductionmentioning

confidence: 99%

One‐Pot Microwave‐Assisted Synthesis of Reduced Graphene Oxide/Iron Oxide Nanocomposite Catalyst for the Oxygen Reduction Reaction

et al. 2016

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We report on a reliable and eco-friendly procedure for the synthesis of reduced graphene oxide/Fe 2 O 3 nanocomposite via a fast microwave-assisted one-pot reduction and functionalization of graphene oxide. Morphology, structure and electrochemical behavior of the as-prepared material were characterized through different techniques. Structural and morphological characterizations evidenced the formation of nanocomposite sheets, with iron oxide nanoparticles in-tegrated in the graphene matrix. Physico-chemical analysis revealed the functionalization of the graphene also by the presence of nitrogen atoms that show synergistic catalysis effects with Fe 2 O 3 . Electrochemical characterizations put in evidence the ability of such material to exploit competitive performances for the oxygen reduction reaction, comparable to Pt-based catalysts, commonly used for fuel cell applications.

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“…A further paper described the preparation of core-shell like 'Pt-surface-enriched' Pt-Ir and Pt-Ru nanoparticles [49]. In this work the researchers reported that their Pt-Ru nanoparticles achieved comparable catalytic activity to commercial Pt/C standards, but noted that these same nanoparticles performed very poorly in accelerated degradation testing, likely due to dissolution and dealloying.…”

Section: Element Selection: D-block Deliberationsmentioning

confidence: 94%

Progress towards the ideal core@shell nanoparticle for fuel cell electrocatalysis

Walker

Rees

Mendes

2018

Journal of Experimental Nanoscience

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The commercialisation of polymer electrolyte fuel cells (PEFCs) has been hampered by the high cost of platinum metal. Due to its high durability and catalytic activity, platinum is widely used to catalyse the oxygen reduction and hydrogen oxidation reactions essential to the operation of these cells. Core@shell nanoparticles with thin layers of platinum deposited on cores composed of cheaper materials have offered an attractive route towards the reduction of overall loading of platinum, with the retention of active catalyst surface area. This review surveys approaches taken to prepare idealised active and durable core@shell nanocatalysts by tweaking core compositions. A critical reflection on the current status of the field, as well as predictions as to likely directions for future developments, are discussed as a conclusion to the review.

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Comparison of iridium– and ruthenium–based, Pt–surface–enriched, nanosize catalysts for the oxygen–reduction reaction

Cited by 24 publications

References 25 publications

Improved bi-functional oxygen electrocatalytic performance of Pt–Ir alloy nanoparticles embedded on MWCNT with Pt-enriched surfaces

Improved bi-functional oxygen electrocatalytic performance of Pt–Ir alloy nanoparticles embedded on MWCNT with Pt-enriched surfaces

One‐Pot Microwave‐Assisted Synthesis of Reduced Graphene Oxide/Iron Oxide Nanocomposite Catalyst for the Oxygen Reduction Reaction

Progress towards the ideal core@shell nanoparticle for fuel cell electrocatalysis

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