Impact of the Various Catalysts (Pt, Pt-Ru) Deposited onto Carbon Support to the Slow Oxygen Reduction Reaction Kinetics

Härk, Eneli; Sepp, Silver; Valk, Peeter; Vaarmets, Kersti; Nerut, Jaak; Jäger, Rutha; Lust, Enn

doi:10.1149/04521.0001ecst

Cited by 19 publications

(35 citation statements)

References 24 publications

(73 reference statements)

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“…The calculated b value for region I is −120±1 mV and for region II is −60±2 mV, which are practically independent of the (100)Pt NP supporting material studied (Table 1). The calculated b value (region I) is nearly the same as the b values obtained for Pt or Ru electrodes10, 14, 25, 31, 36–38 and for Pt nanoclusters deposited onto C(Mo 2 C) 10–16. Within the lower E region (at higher current densities), the value of b gradually increases for all measured catalyst systems, and this effect is comparable to those observed for a layered Pd electrode deposited onto Pt(111),25 Pt–Ru alloy, and Ru(hklf) electrodes at E <0.75 V (vs. SHE)39 as well as for Pt‐nanocluster‐modified carbons 10.…”

Section: Resultssupporting

confidence: 75%

Oxygen Reduction at Shape‐Controlled Platinum Nanoparticles and Composite Catalysts Based on (100)Pt Nanocubes on Microporous–Mesoporous Carbon Supports

et al. 2015

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The electrochemical oxygen reduction reaction (ORR) on bare (100)Pt nanoparticles supported by molybdenum‐carbide‐derived carbon [(100)Pt–C(Mo2C)] with high specific surface area and controlled microporosity–mesoporosity, pore size distribution, electrical conductivity, and corrosion stability was studied in 0.5 M H2SO4 solution by using rotating‐disk‐electrode and cyclic voltammetry methods. The C(Mo2C) powder was prepared from Mo2C at a fixed chlorination temperature (750 °C). Pt nanoparticles were prepared through colloid chemistry and deposited onto/into C(Mo2C) and Vulcan XC72 carbon supports for comparison. The ORR cathodic current densities and half‐wave potentials strongly depend on the characteristics of the carbon material used as the support. High values for the ORR current density were calculated for (100)Pt–C(Mo2C) and the half‐wave potential is nearly 80 mV more positive compared with that for the (100)Pt–Vulcan XC72 catalyst with a similar catalyst loading.

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Section: Resultssupporting

confidence: 75%

Oxygen Reduction at Shape‐Controlled Platinum Nanoparticles and Composite Catalysts Based on (100)Pt Nanocubes on Microporous–Mesoporous Carbon Supports

et al. 2015

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“…13,17 More detailed analysis of the chlorination technique has been reported previously. 13,[18][19][20] The XRD, SEM and TEM methods have been used for the crystallographic and structural analysis of the C(Mo 2 C) powder under study. Some XRD, SEM and TEM data will be given later together with the data for Pt nanoparticles activated materials.…”

Section: Methodsmentioning

confidence: 99%

Investigation of a Carbon-Supported Pt Electrode for Oxygen Reduction Reaction in 0.1M KOH Aqueous Solution

Jäger

Härk

Kasatkin

et al. 2014

J. Electrochem. Soc.

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The carbon-supported Pt nanoclusters (20 wt% metal) electrodes have been tested as oxygen reduction catalysts in 0.1M KOH solutions. The novel non-conventional microporous-mesoporous carbide derived carbon powder, synthesized from molybdenum carbide (Mo 2 C) at 750 • C using the high-temperature chlorination method, has been used as an electrocatalyst support for oxygen electroreduction. For comparison, the corresponding parameters for commercially available VulcanXC72 and (20 wt%) Pt-VulcanXC72 have been obtained. Results of the X-ray diffraction analysis show that the Pt nanoclusters have been deposited mainly as the face-centered cubic (fcc) crystals at both carbon supports. The Pt particles were distributed uniformly on the porous carbon supports, and the average particle size of the Pt nanoclusters at (20 wt%) Pt-C(Mo 2 C) and at (20 wt%) Pt-VulcanXC72 were 42 and 57 Å, respectively. The (20 wt%) Pt-C(Mo 2 C) catalyst demonstrated higher activity (calculated effective electrochemical surface area A eff = 0.485 cm 2 ) with high specific surface area S BET = 1600 m 2 g −1 toward the oxygen electroreduction reaction at room temperature compared with that for the (20 wt%) Pt-VulcanXC72 (A eff = 0.320 cm 2 ) with S BET = 180 m 2 g −1 . The four-electron oxygen reduction mechanism has been established for both, i.e., the (20 wt%) Pt-C(Mo 2 C) and (20 wt%) Pt-VulcanXC72 catalysts based electrodes.

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“…For the preparation of the novel catalyst materials, the micro-mesoporous carbon support, synthesized from molybdenum carbide (Mo 2 C) at 750°C, using the hightemperature chlorination method (7)(8)(9)(10)(11)(12)(13), have been activated with Pt nanoclusters (8,9,12,13), and named as Pt-C. The Pt-nanoparticles were deposited onto the carbon support by the sodium borohydride reduction method (14,15).…”

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Oxygen Reduction Reaction in Alkaline Solution: Influence of Catalyst Loading and Carbon Support Characteristics

et al. 2015

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Oxygen electroreduction reaction in 0.1 M KOH aqueous solution has been investigated varying the catalyst loading deposited onto glassy carbon electrode. It was found that with increasing the catalyst loading the electrocatalytic activity increased. Comparable current density values obtained for 1.0 mg cm-2 Pt-Vulcan electrode could be achieved for Pt-C(Mo2C) electrode with approximate loading of 0.3 mg cm-2, indicating that Pt-C(Mo2C) catalyst has noticably higher activity towards ORR than Pt-Vulcan catalyst.

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Impact of the Various Catalysts (Pt, Pt-Ru) Deposited onto Carbon Support to the Slow Oxygen Reduction Reaction Kinetics

Cited by 19 publications

References 24 publications

Oxygen Reduction at Shape‐Controlled Platinum Nanoparticles and Composite Catalysts Based on (100)Pt Nanocubes on Microporous–Mesoporous Carbon Supports

Oxygen Reduction at Shape‐Controlled Platinum Nanoparticles and Composite Catalysts Based on (100)Pt Nanocubes on Microporous–Mesoporous Carbon Supports

Investigation of a Carbon-Supported Pt Electrode for Oxygen Reduction Reaction in 0.1M KOH Aqueous Solution

Oxygen Reduction Reaction in Alkaline Solution: Influence of Catalyst Loading and Carbon Support Characteristics

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