CO adsorption on Pd(100) studied by multimodal ambient pressure X-ray photoelectron and infrared reflection absorption spectroscopies

Head, Ashley R.; Karslıoğlu, Osman; Gerber, Timm; Yu, Yi; Trotochaud, Lena; Raso, Joseph; Kerger, Philipp; Bluhm, Hendrik

doi:10.1016/j.susc.2017.08.009

Cited by 27 publications

(7 citation statements)

References 20 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To understand the interaction between the gas phase and active surface structure, simultaneous measurements using a combination of several techniques have recently been performed. In these studies, the gas phase, adjacent to the catalytic surface, is being probed simultaneously with the active catalyst surface. ,− Using AP-XPS, the gas phase and the surface chemical composition can be probed simultaneously, making AP-XPS a powerful technique for catalysis studies. The advantage of using electron-based techniques, such as XPS, is the surface sensitivity of the measurements enabling the observation of the interaction between the gas molecules and the active site.…”

Section: Introductionmentioning

confidence: 99%

Bridging the Pressure Gap in CO Oxidation

et al. 2021

View full text Add to dashboard Cite

Performing fundamental operando catalysis studies under realistic conditions is a key to further develop and increase the efficiency of industrial catalysts. Operando X-ray photoelectron spectroscopy (XPS) experiments have been limited to pressures, and the relevance for industrial applications has been questioned. Herein, we report on the CO oxidation experiment on Pd(100) performed at a total pressure of 1 bar using XPS. We investigate the light-off regime and the surface chemical composition at the atomistic level in the highly active phase. Furthermore, the observed gas-phase photoemission peaks of CO 2 , CO, and O 2 indicate that the kinetics of the reaction during the light-off regime can be followed operando , and by studying the reaction rate of the reaction, the activation energy is calculated. The reaction was preceded by an in situ oxidation study in 7% O 2 in He and a total pressure of 70 mbar to confirm the surface sensitivity and assignment of the oxygen-induced photoemission peaks. However, oxygen-induced photoemission peaks were not observed during the reaction studies, but instead, a metallic Pd phase is present in the highly active regime under the conditions applied. The novel XPS setup utilizes hard X-rays to enable high-pressure studies, combined with a grazing incident angle to increase the surface sensitivity of the measurement. Our findings demonstrate the possibilities of achieving chemical information of the catalyst, operando , on an atomistic level, under industrially relevant conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Bridging the Pressure Gap in CO Oxidation

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Possibly, the form of CO adsorption on the surface of Pd was modified (strongly bounded CO adsorption forms maybe operating like bridge and or 3-fold). We have no direct experimental evidence for this, although the literature indicates that this is probably what happens [38][39][40]. Besides, both CO stripping (see Fig.…”

Section: Electrochemical Activity Studiesmentioning

confidence: 88%

Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions

Souza

Parreira

Hammer

et al. 2017

J Solid State Electrochem

View full text Add to dashboard Cite

This work reports the sol-gel synthesis and characterization of Pd x Nb y /C binary electrocatalysts applied to ethanol electrooxidation reactions (EORs). Catalysts were prepared using different Pd/Nb mass ratios (1:0; 1:1; 1:3; 3:1; 0:1) and were supported on Vulcan XC-72 carbon (20 wt%). The materials were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, inductively coupled plasma mass spectrometry, and X-ray photoelectron spectroscopy. The EOR catalytic activity was studied by cyclic voltammetry (CV) and chronoamperometry (CA). The results showed that the EOR current density peak using Pd 1 Nb 1 /C (45.5 mA mg −1) was 2.86 times higher than that of commercial Pd/C (15.9 mA mg −1). This catalyst also showed a less positive EOR onset potential and 2.35 times higher current density than Pd/C did in CA. The Pd 1 Nb 1 /C (− 0.54 V) showed onset potential more negative than Pd/C (− 0.50 V) for CO-stripping analysis. Additionally, the addition of Nb in the Pd/C reduces CO ads poisoning of the electrocatalyst. The results suggest that Nb decreases the poisoning effect of CO on the Pd surface due to the bifunctional mechanism in which Nb supplies oxygenated species for CO oxidation at poisoned Pd active sites. No evidence of Pd/Nb alloy formation has been found. The maximization of the bifunctional effect occurs in Pd 1 Nb 1 /C.

show abstract

“…[ 65,66 ] The CO adsorption studies on materials surface is therefore a topic of great research interest. [ 67–70 ] However, the ability of the coinage metals for the adsorption of CO in their 2D form is to be revealed.…”

Section: Introductionmentioning

confidence: 99%

Structure, Stability, Properties, and Application of Atomically Thin Coinage Metal Flatland in Graphene Pore: A Density Functional Theory Calculation

Sangolkar

Pawar

2021

Physica Status Solidi (b)

View full text Add to dashboard Cite

2D metals are emerging materials in the 2D nanomaterials family and a rapid development is seen in the past few years. The properties of material that play a crucial role to determine their application in various fields need to be explored. Herein, a patch consisting of seven to nine coinage metal (Cu, Ag, and Au) atoms is created in the pore of graphene. Electronic properties, work function, and the interaction energy using periodic energy decomposition analysis (pEDA) of the materials are calculated using density functional theory (DFT). Carbon monoxide (CO) adsorption studies on these surfaces are also performed. All the metal atoms are found to align themselves in hexagonal arrangement in the graphene pore. All the materials with an exception of eight‐Au‐patched graphene are found to be metallic. The eight‐Au‐patched graphene is a low bandgap semiconductor exhibiting a direct bandgap of 0.23 eV. CO molecule adsorbs strongly on Cu‐patched surfaces in comparison to Ag‐ and Au‐patched surfaces. The interaction energy of CO is observed to be higher on seven‐Cu‐patched graphene as compared with Ag‐ and Au‐patched graphene.

show abstract

CO adsorption on Pd(100) studied by multimodal ambient pressure X-ray photoelectron and infrared reflection absorption spectroscopies

Cited by 27 publications

References 20 publications

Bridging the Pressure Gap in CO Oxidation

Bridging the Pressure Gap in CO Oxidation

Niobium: a promising Pd co-electrocatalyst for ethanol electrooxidation reactions

Structure, Stability, Properties, and Application of Atomically Thin Coinage Metal Flatland in Graphene Pore: A Density Functional Theory Calculation

Contact Info

Product

Resources

About