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Related Concept Videos

Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
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A Versatile Approach to Electrochemical In Situ Ambient-Pressure X-ray Photoelectron Spectroscopy: Application to a

Olaf Brummel1, Yaroslava Lykhach1, Maryline Ralaiarisoa2

  • 1Interface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany.

The Journal of Physical Chemistry Letters
|November 21, 2022
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Summary

We developed electrochemical in situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) to study electrocatalysts. This method reveals that palladium oxide formed in situ differs significantly from ex situ observations due to species decomposition.

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Area of Science:

  • Surface Science
  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Understanding the behavior of electrocatalysts at the electrode/electrolyte interface is crucial for developing efficient energy conversion devices.
  • Traditional ex situ analysis methods can alter the state of the active species, leading to inaccurate interpretations of catalytic mechanisms.
  • There is a need for advanced in situ techniques capable of probing electrochemical interfaces under realistic operating conditions.

Purpose of the Study:

  • To introduce and validate a novel electrochemical in situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) technique.
  • To investigate the oxidation state changes of palladium nanoparticles on a complex oxide support under electrochemical control.
  • To compare in situ and ex situ observations of electrocatalyst behavior and highlight the importance of in situ analysis.

Main Methods:

  • Development of a miniature capillary device for a three-electrode electrochemical cell in a thin-layer configuration.
  • Utilizing tender X-ray synchrotron radiation for electrochemical in situ AP-XPS analysis of the electrode/electrolyte interface.
  • Investigating palladium nanoparticles supported on Co3O4(111) film on Ir(100) in an alkaline electrolyte under potential control.

Main Results:

  • The palladium oxide formed during the in situ electrochemical experiment was found to be significantly different from that observed in ex situ emersion experiments.
  • Differences were attributed to the decomposition of a labile palladium oxide/hydroxide species upon removal from the electrolyte (emersion).
  • The study successfully demonstrated the capability of the developed in situ AP-XPS method for analyzing complex electrocatalytic interfaces.

Conclusions:

  • Electrochemical in situ AP-XPS is a powerful and versatile technique for studying complex electrocatalyst interfaces under operating conditions.
  • Ex situ analysis can lead to misinterpretation of the catalyst's true state due to post-analysis surface changes.
  • This approach is essential for accurate mechanistic understanding and rational design of advanced electrocatalysts.