Heat-treatment effects on the ORR activity of Pt nanoparticles deposited on multi-walled carbon nanotubes using magnetron sputtering technique

Hussain, Sajid; Erikson, Heiki; Kongi, Nadežda; Merisalu, Maido; Ritslaid, Peeter; Sammelselg, Väinö; Tammeveski, Kaido

doi:10.1016/j.ijhydene.2016.11.164

Cited by 63 publications

(29 citation statements)

References 68 publications

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“…It has been reported previously, that pyridinic and/or graphitic N are actually responsible for the high ORR performance of N-doped carbon materials. [42,56] According to previous reports, the change of the slope is not related to different reaction mechanism, but it has been attributed to the potential-dependent coverage of surface oxides on Pt catalyst that inhibit the adsorption of O 2 and reaction intermediates. Tafel slope values were determined from two characteristic Tafel regions and are presented in Tables 1 and 2.…”

Section: Electrochemical Reduction Of Oxygenmentioning

confidence: 92%

“…Nevertheless, trace amount of Cl À anions may remain from precursors and further exacerbate the catalyst efficiency by blocking Pt surface active sites. [41][42][43][44] Formation of the Pt surface oxides can be seen in the anodic sweep at a potential above 0.8 V in both media, which are reduced at~0.7 V in the cathodic sweep. In PEM fuel cells, chloride impurities arise from the membrane electrode assembly (MEA) preparation and less than 5-ppm of chloride residues can result in a voltage loss of 50 mV and affect the open-circuit voltage.…”

Section: Co-stripping and CV Experimentsmentioning

confidence: 99%

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Oxygen Electroreduction on Pt Nanoparticles Deposited on Reduced Graphene Oxide and N‐doped Reduced Graphene Oxide Prepared by Plasma‐assisted Synthesis in Aqueous Solution

et al. 2018

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Platinum nanoparticles were deposited on reduced graphene oxide (rGO) and nitrogen-doped rGO (rGOÀN) by He/H 2 plasma jet treatment of H 2 PtCl 6 aqueous solution for electroreduction of oxygen. Physical characterization of the prepared catalysts was performed by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Electrochemical characterization was carried out by cyclic voltammetry and CO-stripping techniques. The oxygen reduction reaction (ORR) activity of the prepared Pt/rGO and Pt/ rGOÀN catalyst materials was investigated using the rotating disk electrode method in 0.1 M KOH and 0.05 M H 2 SO 4 . In both acidic and alkaline electrolytes, the catalyst materials prepared by the plasma jet method demonstrated superior electrocatalytic properties compared to that of commercial 20 wt% Pt/ C catalyst. Specific activity values for the ORR in acid electrolyte were 2-fold and in alkaline media more than 3-fold higher than that obtained for commercial Pt/C catalyst.

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Section: Electrochemical Reduction Of Oxygenmentioning

confidence: 92%

Section: Co-stripping and CV Experimentsmentioning

confidence: 99%

Oxygen Electroreduction on Pt Nanoparticles Deposited on Reduced Graphene Oxide and N‐doped Reduced Graphene Oxide Prepared by Plasma‐assisted Synthesis in Aqueous Solution

et al. 2018

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“…The thermal treatment results are in accordance with the researches performed by Hussain etc. on MWCNTs . What's more, comparing with the solvothermal synthesized PtNi alloy developed by Carpenter etc .…”

Section: Resultsmentioning

confidence: 87%

H ₂ ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst

Zhao

Wang

Wang³

et al. 2020

Int J Energy Res

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Summary In the purpose of maximizing the utilization of noble metal Pt in oxygen reduction catalysts, we illustrate a synthesis method of preparing the low‐platinum PtNi/C alloyed oxygen reduction reaction (ORR) catalyst, which is developed through the H2‐induced treatment to a glucose reduced PtNi/C alloy. After post‐treatment with H2/N2 mixture gases, this catalyst displays excellent ORR catalytic activity and durability for the synergetic influences of electronic and geometry effects on catalysts during the alloying. Specifically, the as‐prepared PtNi/C (350°C‐6 h) sample delivers preponderant ORR activity with only 53.5% Pt usage than the commercial Pt/C. The specific activity and mass activity are corresponding 7.49 times and 3.5 times to the commercial Pt/C. This catalyst exhibits excellent ORR catalytic activity after 10 000 potential cycles in acid, which benefits from the well alloyed core‐shell structure of PtNi/C. H2‐induced thermal treatment has significant effects on the development of high performance low‐platinum PtNi/C alloy catalyst, and plays the significant role in the formation of well‐alloyed core‐shell structures. The lowered d‐band center is believed to facilitate ORR catalysis through weakening the adsorption of intermediate oxygen species on the alloyed Pt surface. Therefore, PtNi/C(350°C‐6 h) alloyed catalyst possesses outstanding ORR catalytic activity with much lower Pt loading.

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“…The Tafel slope values for all Pt/MWCNT-A (Figure 7a) and Pt/MWCNT-B (Figure 7b) electrodes were close to −60 and −120 mV dec −1 at low current densities and higher current densities, respectively, which indicated that all the electrodes followed the same mechanistic pathway and that the rate of the ORR is determined by the transfer of the first electron to the adsorbed O 2 molecule. 32,34,62 The specific activity (SA) values of the Pt/MWCNT electrodes for ORR were calculated from the equation given below:…”

Section: Resultsmentioning

confidence: 99%

“…• C. 32 Gasteiger and co-workers obtained SA values of 0.20 mA cm −2 at 0.9 V in acid electrolyte for state-of-the-art Pt/C catalysts. 63 Li et al studied composite materials prepared by mixing Pt-coated reduced graphene oxide with carbon black.…”

Section: Resultsmentioning

confidence: 99%

Platinum Particles Electrochemically Deposited on Multiwalled Carbon Nanotubes for Oxygen Reduction Reaction in Acid Media

Hussain

Erikson

Kongi

et al. 2017

J. Electrochem. Soc.

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Platinum nanoparticles supported on multiwalled carbon nanotubes (Pt/MWCNT) were prepared using controlled electrochemical deposition from Ar-saturated H 2 PtCl 6 solution. The electrodeposition parameters were varied to observe change in the surface morphology and electrocatalytic activity of the Pt/MWCNT catalysts for oxygen reduction reaction (ORR). Surface morphology of the prepared catalysts was studied by scanning electron microscope (SEM) and scanning transmission electron microscope (STEM). For electrochemical characterization of the Pt/MWCNT electrocatalysts, CO-stripping and cyclic voltammetry (CV) experiments were performed in 0.05 M H 2 SO 4 solution. The ORR was studied in acid medium using the rotating disk electrode (RDE) method. The results obtained were analyzed and compared to those of commercial Pt/C. The size, shape and distribution of Pt particles as well as the electrochemical behavior of Pt/MWCNT modified electrodes showed strong dependence on the deposition parameters. The catalyst materials prepared by electrochemical deposition showed higher specific activities than commercial Pt/C catalyst. The Pt/MWCNT cathode materials showed remarkable stability during repetitive potential cycling in 0. Proton exchange membrane fuel cell (PEMFC) is identified as one of the most promising environmentally friendly sustainable energy conversion devices that efficiently convert fuel energy into electricity through electrochemical processes. [1][2][3] In comparison to the conventional internal combustion engine, low-temperature fuel cells are preferred for energy conversion in vehicles because of its green operating system, high efficiency and renewable energy resources.4,5 One of the most critical challenges for commercializing fuel cells is the development of more efficient, highly active and durable electrocatalysts to improve the sluggish kinetics of the oxygen reduction reaction (ORR). To date, Pt-based cathode catalysts have shown significantly high electrocatalytic activity toward the ORR as compared to other metals, alloys, core-shell structures, mixed metal oxides and nonnoble metal catalysts.6-15 Considerable efforts have been dedicated to minimize the amount of Pt loading and improve its electrocatalytic activity and durability, mainly because of its scarcity and high cost. [16][17][18][19]

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Heat-treatment effects on the ORR activity of Pt nanoparticles deposited on multi-walled carbon nanotubes using magnetron sputtering technique

Cited by 63 publications

References 68 publications

Oxygen Electroreduction on Pt Nanoparticles Deposited on Reduced Graphene Oxide and N‐doped Reduced Graphene Oxide Prepared by Plasma‐assisted Synthesis in Aqueous Solution

Oxygen Electroreduction on Pt Nanoparticles Deposited on Reduced Graphene Oxide and N‐doped Reduced Graphene Oxide Prepared by Plasma‐assisted Synthesis in Aqueous Solution

H ₂ ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst

Platinum Particles Electrochemically Deposited on Multiwalled Carbon Nanotubes for Oxygen Reduction Reaction in Acid Media

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Heat-treatment effects on the ORR activity of Pt nanoparticles deposited on multi-walled carbon nanotubes using magnetron sputtering technique

Cited by 63 publications

References 68 publications

Oxygen Electroreduction on Pt Nanoparticles Deposited on Reduced Graphene Oxide and N‐doped Reduced Graphene Oxide Prepared by Plasma‐assisted Synthesis in Aqueous Solution

Oxygen Electroreduction on Pt Nanoparticles Deposited on Reduced Graphene Oxide and N‐doped Reduced Graphene Oxide Prepared by Plasma‐assisted Synthesis in Aqueous Solution

H 2 ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst

Platinum Particles Electrochemically Deposited on Multiwalled Carbon Nanotubes for Oxygen Reduction Reaction in Acid Media

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H ₂ ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst