Electrodeposition of Pt - Rare Earth Alloys as ORR Catalysts for Fuel Cells

Asen, Ludwig; Ju, Wenbo; Mostafa, Ehab; Martens, Slađjana; Stimming, Ulrich; Schneider, Oliver

doi:10.1149/07515.0323ecst

Cited by 13 publications

(20 citation statements)

References 23 publications

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“…The electrodeposition of Pt has been reported in literature from BMIm BF4 (45), BMIm PF6 (45), and (N122,2O1)BF4 (46) using hexachloroplatinate (K2PtCl6 or H2PtCl6) as precursor, from BMP DCA using PtCl2 (47,48) and from BMP TFSI + BMP Cl + PtCl2 (48). We successfully deposited Pt nanoparticles from H2PtCl6 in (N122,2O1)BF4 or OMP TFSI (44). In both cases, the typical two reduction (and oxidation) waves for the Pt(IV)/Pt(II) and the Pt(II)/Pt(0) peak couple were observed, as reported already in (46).…”

Section: Introductionsupporting

confidence: 64%

“…In the latter work, also a dissolution peak was obtained, and the nature of the deposit formed potentiostatically was supported by SEM, XRD and XPS measurements. As our own earlier electrodeposition experiments of Y and La from OMP TFSI and N,N-diethyl-Nmethyl-N-(2-methoxyethyl)ammonium tetrafluoroborate ((N122,2O1)BF4) had not been successful (44), we adapted the La deposition procedure by Zhang et al for Gd deposition, selecting thus BMIm DCA as IL.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of Pt and Gd from the Same Ionic Liquid

Asen,

Martens,

Heiz

et al. 2018

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Platinum rare earth alloys show several times higher electrocatalytic activity for the oxygen reduction reaction than pure platinum while still maintaining an excellent stability. However, the high reactivity of rare earth elements makes the preparation of such alloys with scalable methods challenging. The electrodeposition from ionic liquids seems to be a possible route. In this work, we demonstrate the electrodeposition of the rare earth metal gadolinium from the ionic liquid butylmethylimidazolium dicyanamide at elevated temperatures. The deposition of Pt metal from this ionic liquid has been studied using several different precursors.

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Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Pt and Gd from the Same Ionic Liquid

Asen,

Martens,

Heiz

et al. 2018

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“…After characterization with ex situ AFM, the catalyst was shown to perform well in methanol oxidation. More recently, also Pt NPs were electrodeposited from tetraalkylammonium‐based ILs and from octylmethylpyrrolidinium bis(trifluoromethylsulfonyl)imid (OMP TFSI) . These particles are active toward the ORR .…”

Section: Adsorbate Structures At Catalytic Surfacesmentioning

confidence: 99%

“…More recently, also Pt NPs were electrodeposited from tetraalkylammonium‐based ILs and from octylmethylpyrrolidinium bis(trifluoromethylsulfonyl)imid (OMP TFSI) . These particles are active toward the ORR . Also attempts at the electrodeposition of Pt‐rare earth catalysts using ILs are underway .…”

Section: Adsorbate Structures At Catalytic Surfacesmentioning

confidence: 99%

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Electrochemical Scanning Probe Microscopies in Electrocatalysis

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surface coordination, strain effects, [6][7][8][9] ligand effects, [10,11] ensemble effects, [12] and the electrolyte composition. [13] A detailed understanding of these effects requires experimental and computational procedures to investigate the working mechanisms of the electrocatalysis. Ideally, atomically resolved topographic and chemical information of the catalyst surface under reaction conditions is required. Transmission electron microscopy (TEM) has been reported to be capable of in operando investigation of catalyst structures while catalytic reactions are taking place. [14] However, the instrumentation utilized for such purpose has very strong restrictions and realistic operating conditions cannot be easily applied so far. Alternatively, scanning probe microscopies (SPMs) and electrochemical scanning probe microscopies (EC-SPMs) are able to perform structural measurements of catalytic systems under reaction conditions with resolution down to atomic scales. Normally, EC-SPMs, for instance electrochemical scanning tunneling microscopy (EC-STM), electrochemical atomic force microscopy (EC-AFM), and scanning electrochemical potential microscopy (SECPM), can provide structural information on the solid side of the electrode/electrolyte interface at the atomic level for conductive samples (EC-STM is limited in the case of semi/nonconductive samples). However, these techniques usually lack the capability of chemical sensitivity, ultrahigh resolution reactivity monitoring, and probing the property of the electrolyte side of the interface. One well-developed exception is the scanning electrochemical microscopy (SECM), which will also be discussed in detail within this review. Additionally, SECM and related methods permit gleaning information about the electrolyte side of the electrochemical interface. However, the resolution of SECM and related methods is limited by the size of the SECM-probe and the working principle of SECM.In this review, first a very brief overview on electrocatalysis and on the importance of model substrates for understanding the fundamental underlying principles is given. Thereafter, the operational principle of different SPM techniques is summarized. The main focus of the work lies then on the application of the techniques to study phenomena important for electrocatalysis, including surface topography and adsorption processes. Within that context, also the application of room Improvements toward highly efficient electrochemical energy conversion require a detailed understanding of the underlying electrochemical processes at electrified solid-liquid interfaces. In situ and in operando studies by means of electrochemical scanning probe microscopy (EC-SPM) have become indispensable experimental tools due to their capability of resolving surface topography down to the atomic level even within the harsh environment of electrolytes. EC-SPM methodologies have thus contributed tremendously to the current understanding of electrocatalysis. In this review article, recent achievements in complement...

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Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)

et al. 2018

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In the face of the global energy challenge and progressing global climate change, renewable energy systems and components, such as fuel cells and electrolyzers, which close the energetic oxygen and carbon cycles, have become a technology development priority. The electrochemical oxygen reduction reaction (ORR) and the direct electrochemical carbon dioxide reduction reaction (CO2RR) are important electrocatalytic processes that proceed at gas diffusion electrodes of hydrogen fuel cells and CO2 electrolyzers, respectively. However, their low catalytic activity (voltage efficiency), limited long‐term stability, and moderate product selectivity (related to their Faradaic efficiency) have remained challenges. To address these, suitable catalysts are required. This review addresses the current state of research on Pt‐based and Cu‐based nanoalloy electrocatalysts for ORR and CO2RR, respectively, and critically compares and contrasts key performance parameters such as activity, selectivity, and durability. In particular, Pt nanoparticles alloyed with transition metals, post‐transition metals and lanthanides, are discussed, as well as the material characterization and their performance for the ORR. Then, bimetallic Cu nanoalloy catalysts are reviewed and organized according to their main reaction product generated by the second metal. This review concludes with a perspective on nanoalloy catalysts for the ORR and the CO2RR, and proposes future research directions.

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Electrodeposition of Pt - Rare Earth Alloys as ORR Catalysts for Fuel Cells

Cited by 13 publications

References 23 publications

Electrodeposition of Pt and Gd from the Same Ionic Liquid

Electrodeposition of Pt and Gd from the Same Ionic Liquid

Electrochemical Scanning Probe Microscopies in Electrocatalysis

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)

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Electrodeposition of Pt - Rare Earth Alloys as ORR Catalysts for Fuel Cells

Cited by 13 publications

References 23 publications

Electrodeposition of Pt and Gd from the Same Ionic Liquid

Electrodeposition of Pt and Gd from the Same Ionic Liquid

Electrochemical Scanning Probe Microscopies in Electrocatalysis

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO2RR)

Contact Info

Product

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About

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)