Reformate gas composition and pressure effect on CO tolerant Pt/Ti0.8Mo0.2O2–C electrocatalyst for PEM fuel cells

Yazici, M. Süha; Dursun, Sümeyye; Borbáth, Irina; Tompos, András

doi:10.1016/j.ijhydene.2020.08.226

Cited by 19 publications

(22 citation statements)

References 41 publications

(68 reference statements)

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“…It was established that the rutile polymorph of TiO 2 is preferred as the dopant incorporation is much better than in the case of anatase. The superior performance (involving the CO-tolerance) of the composite-supported catalysts was demonstrated also in fuel cell test experiments [2,13]. A recent model investigation suggested that the active sites responsible for the beneficial properties of the mixed oxide -carbon composite supported electrocatalysts are located at the perimeter of the Pt particles where atomic closeness with the surface dopant species belonging to the oxide is ensured [14].…”

Section: Introductionmentioning

confidence: 85%

Effect of the reductive treatment on the state and electrocatalytic behavior of Pt in catalysts supported on Ti0.8Mo0.2O2-C composite

Silva

Borbáth

Zelenka

et al. 2021

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Ti(1-x)MoxO2-carbon composites are promising new supports for Pt-based electrocatalysts in polymer electrolyte membrane fuel cells offering exciting catalytic properties and enhanced stability against electrocorrosion. Pt and the mixed oxide form a couple liable for strong metal-support interaction (SMSI) phenomenon, generally manifesting itself in decoration of the metal particles by ultrathin layers of the support material upon annealing under reductive conditions. The aim of this work is to evaluate the SMSI phenomenon as a potential strategy for tailoring the properties of the electrocatalyst. A 20 wt% Pt/50 wt% Ti0.8Mo0.2O2-50 wt% C electrocatalyst prepared on Black Pearls 2000 carbon functionalized with HNO3 and glucose was reduced at 250 °C in H2 in order to induce SMSI. The electrocatalytic properties and the stability of the reduced and the original catalysts were analyzed by cyclic voltammetry and COads stripping voltammetry. Structural investigations as well as X-ray photoelectron spectroscopy (XPS) measurements were performed in order to obtain information about the details of the interaction between the oxide and the Pt particles. The electrochemical experiments pointed out a small loss of the electrochemically active surface area of Pt in the reduced catalyst along with enhanced stability with respect to the original one, while structural studies suggested only a minimal decrease of the Pt dispersion. At the same time, hydrogen exposure experiments combined with XPS demonstrated the presence of Mo species directly adsorbed on the Pt surface. Thus, the properties of the reduced catalyst can be traced to decoration of the surface of Pt by Mo-containing species.

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Section: Introductionmentioning

confidence: 85%

Effect of the reductive treatment on the state and electrocatalytic behavior of Pt in catalysts supported on Ti0.8Mo0.2O2-C composite

Silva

Borbáth

Zelenka

et al. 2021

Reac Kinet Mech Cat

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“…The Nafion membrane was pretreated as described before 33 . The chitosan membrane was prepared by solution molding and solvent evaporation techniques as explained previously 31 .…”

Section: Methodsmentioning

confidence: 99%

Effects of cathode gas diffusion layer type and membrane electrode assembly preparation on the performance of immobilized glucose oxidase‐based enzyme fuel cell

Yazici

Bahar

2021

Asia-Pacific J Chem Eng

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Different cathode configurations with carbon paper (CP) and carbon cloth (CC) gas diffusion layer (GDL) are combined with Nafion® 115 for GOx enzyme fuel cells. Catalyst‐coated Nafion membrane (without a GDL) has resulted with highest impedance and lowest polarization response. Hot pressing of cathode gas diffusion electrode (GDE) onto the Nafion or physical placement onto the alternative chitosan membrane has reduced interface resistance 10 times compared with no‐GDL case. The best performance for the Nafion membrane is 2.1 mA cm−2 current density with hot‐pressed CC‐GDE. Smallest high‐frequency electrolyte (0.55 ohm) and charge transfer resistances (0.15 ohm) were measured with physically placed CC‐GDE on the alternative chitosan membrane resulting in maximum short current density of 3 mA cm−2 with a 4‐cm2 single enzyme fuel cell.

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“…line f in Figure 6 and line a in Figure 9); both TiGO-3Cat and TiBPCat electrocatalysts contained rutile phase and nanodispersed Pt indicated by a broad band at 40 degree in the XRD pattern (Figure 9). Our previous works repeatedly demonstrated that this feature arises from well dispersed uniformly distributed Pt particles with average size around 2-3 nm [35,36,73]. Fine dispersion of Pt was mainly related to the applied modified sodium borohydride (NaBH4) assisted ethylene-glycol (EG) reduction-precipitation method and to a lesser extent depended on the structural characteristics of the support [36].…”

Section: Physicochemical Characterizationmentioning

confidence: 98%

Synthesis and Characterization of Graphite Oxide Derived TiO2-Carbon Composites as Potential Electrocatalyst Supports

et al. 2021

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TiO2-C (carbon) hybrid materials are promising electrocatalyst supports because the presence of TiO2 results in enhanced stability. Use of new types of carbonaceous materials such as reduced graphene oxide (rGO) instead of traditional active carbon provides certain benefits.Although the rutile polymorph of TiO2 seems to have the most beneficial properties in these hybrid materials, the anatase type is more frequent in TiO2-rGO composites, especially in graphite oxide (GO) derived ones, as GO has several properties which may interfere with rutile formation. To explore and evaluate these peculiarities and their influence on the composite formation, we compared TiO2-C systems formulated with GO and Black Pearls (BP) carbon.Various physicochemical methods, such as attenuated total reflection infrared (ATR-IR)-, solid state NMR-, Raman-and X-ray photoelectron spectroscopy, X-ray powder diffraction (XRD), electron microscopy, etc. were used to characterize the samples from the different stages of our multistep sol-gel synthesis. Our experiments demonstrated that utilization of GO is indeed feasible for composite preparation, although its sodium contamination has to be removed during the synthesis. On the other hand, high temperature treatment and/or solvothermal treatment during composite synthesis resulted in decomposition of the functional groups of the GO and the functional properties of the final product were similar in case of both composites. However, Pt/TiO2-GO derived sample showed higher oxygen reduction reaction (ORR) activity than Pt/TiO2-BP derived one. Based on the decrease of electrochemical surface area, the stability order was the following: Pt/C (commercial) < Pt/TiO2-BP derived C < Pt/TiO2-GO derived C.

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Reformate gas composition and pressure effect on CO tolerant Pt/Ti0.8Mo0.2O2–C electrocatalyst for PEM fuel cells

Cited by 19 publications

References 41 publications

Effect of the reductive treatment on the state and electrocatalytic behavior of Pt in catalysts supported on Ti0.8Mo0.2O2-C composite

Effect of the reductive treatment on the state and electrocatalytic behavior of Pt in catalysts supported on Ti0.8Mo0.2O2-C composite

Effects of cathode gas diffusion layer type and membrane electrode assembly preparation on the performance of immobilized glucose oxidase‐based enzyme fuel cell

Synthesis and Characterization of Graphite Oxide Derived TiO2-Carbon Composites as Potential Electrocatalyst Supports

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