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Deconvoluting XPS Spectra of La-Containing Perovskites from First-Principles

Journal Article · · JACS Au
 [1];  [1];  [2];  [3];  [4];  [5]
  1. Washington State Univ., Pullman, WA (United States)
  2. Wayne State Univ., Detroit, MI (United States)
  3. Univ. of Leipzig (Germany)
  4. Univ. of Michigan, Ann Arbor, MI (United States); Wayne State Univ., Detroit, MI (United States)
  5. Washington State Univ., Pullman, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Perovskite-based oxides are used in electrochemical CO2 and H2O reduction in electrochemical cells due to their compositional versatility, redox properties and stability. However limited knowledge exists on the mechanisms driving these processes. Toward this understanding, herein we probe the core level binding energy shifts of water-derived adspecies (H, O, OH, H2O) as well as the adsorption of CO2 on LaCoO3 and LaNiO3 and we correlate the simulated peaks with experimental Temperature Programmed X-ray Photoelectron Spectroscopy (TPXPS) results. We find the strong adsorption of such chemical species can affect the antiferromagnetic ordering of LaNiO3. The adsorption of such adspecies is further quantified through Bader and differential charge analyses. We find the higher O 1s core level binding energy peak for both LaCoO3 and LaNiO3 corresponds to adsorption of water-related species and CO2, while the lower energy peak is due to lattice oxygen. We further correlate these DFT-based core level O 1s binding energies with the TPXPS measurements to quantify the decrease of the O 1s contribution due to desorption of adsorbates and the apparent increase of the lattice oxygen (both bulk and surface) with temperature. Finally, we quantify the influence of adsorbates on the La 4d, Co 2p and the Ni 3p core level binding energy shifts. This work demonstrates how theoretically generated XPS data can be utilized to predict species-specific binding energy shifts to assist in the deconvolution of the experimental results.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2480703
Report Number(s):
PNNL-SA--199847
Journal Information:
JACS Au, Journal Name: JACS Au Journal Issue: 8 Vol. 4; ISSN 2691-3704
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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