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Title: Simultaneous detection of electronic structure changes from two elements of a bifunctional catalyst using wavelength-dispersive X-ray emission spectroscopy and in situ electrochemistry

Abstract

Multielectron catalytic reactions, such as water oxidation, nitrogen reduction, or hydrogen production in enzymes and inorganic catalysts often involve multimetallic clusters. In these systems, the reaction takes place between metals or metals and ligands to facilitate charge transfer, bond formation/breaking, substrate binding, and release of products. In this study, we present a method to detect X-ray emission signals from multiple elements simultaneously, which allows for the study of charge transfer and the sequential chemistry occurring between elements. Kβ X-ray emission spectroscopy (XES) probes charge and spin states of metals as well as their ligand environment. A wavelength-dispersive spectrometer based on the von Hamos geometry was used to disperse Kβ signals of multiple elements onto a position detector, enabling an XES spectrum to be measured in a single-shot mode. This overcomes the scanning needs of the scanning spectrometers, providing data free from temporal and normalization errors and therefore ideal to follow sequential chemistry at multiple sites. We have applied this method to study MnOx-based bifunctional electrocatalysts for the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). In particular, we investigated the effects of adding a secondary element, Ni, to form MnNiOx and its impact on the chemical states andmore » catalytic activity, by tracking the redox characteristics of each element upon sweeping the electrode potential. In conclusion, the detection scheme we describe here is general and can be applied to time-resolved studies of materials consisting of multiple elements, to follow the dynamics of catalytic and electron transfer reactions.« less

Authors:
 [1];  [2];  [3];  [4];  [3];  [5];  [6];  [2];  [3];  [7];  [8];  [3];  [6];  [9];  [10]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
  2. Stanford Univ., CA (United States). Dept. of Chemical Engineering
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. Univ. of California, Santa Cruz, CA (United States)
  9. Stanford Univ., CA (United States). Dept. of Chemical Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis
  10. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Center on Nanostructuring for Efficient Energy Conversion (CNEEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1258004
Grant/Contract Number:  
AC02-05CH11231; SC0001060; SC0004993; P41GM103393; R01GM110501; P41RR001209
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Volume: 17; Journal Issue: 14; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Gul, Sheraz, Ng, Jia Wei Desmond, Alonso-Mori, Roberto, Kern, Jan, Sokaras, Dimosthenis, Anzenberg, Eitan, Lassalle-Kaiser, Benedikt, Gorlin, Yelena, Weng, Tsu-Chien, Zwart, Petrus H., Zhang, Jin Z., Bergmann, Uwe, Yachandra, Vittal K., Jaramillo, Thomas F., and Yano, Junko. Simultaneous detection of electronic structure changes from two elements of a bifunctional catalyst using wavelength-dispersive X-ray emission spectroscopy and in situ electrochemistry. United States: N. p., 2015. Web. doi:10.1039/c5cp01023c.
Gul, Sheraz, Ng, Jia Wei Desmond, Alonso-Mori, Roberto, Kern, Jan, Sokaras, Dimosthenis, Anzenberg, Eitan, Lassalle-Kaiser, Benedikt, Gorlin, Yelena, Weng, Tsu-Chien, Zwart, Petrus H., Zhang, Jin Z., Bergmann, Uwe, Yachandra, Vittal K., Jaramillo, Thomas F., & Yano, Junko. Simultaneous detection of electronic structure changes from two elements of a bifunctional catalyst using wavelength-dispersive X-ray emission spectroscopy and in situ electrochemistry. United States. https://doi.org/10.1039/c5cp01023c
Gul, Sheraz, Ng, Jia Wei Desmond, Alonso-Mori, Roberto, Kern, Jan, Sokaras, Dimosthenis, Anzenberg, Eitan, Lassalle-Kaiser, Benedikt, Gorlin, Yelena, Weng, Tsu-Chien, Zwart, Petrus H., Zhang, Jin Z., Bergmann, Uwe, Yachandra, Vittal K., Jaramillo, Thomas F., and Yano, Junko. Wed . "Simultaneous detection of electronic structure changes from two elements of a bifunctional catalyst using wavelength-dispersive X-ray emission spectroscopy and in situ electrochemistry". United States. https://doi.org/10.1039/c5cp01023c. https://www.osti.gov/servlets/purl/1258004.
@article{osti_1258004,
title = {Simultaneous detection of electronic structure changes from two elements of a bifunctional catalyst using wavelength-dispersive X-ray emission spectroscopy and in situ electrochemistry},
author = {Gul, Sheraz and Ng, Jia Wei Desmond and Alonso-Mori, Roberto and Kern, Jan and Sokaras, Dimosthenis and Anzenberg, Eitan and Lassalle-Kaiser, Benedikt and Gorlin, Yelena and Weng, Tsu-Chien and Zwart, Petrus H. and Zhang, Jin Z. and Bergmann, Uwe and Yachandra, Vittal K. and Jaramillo, Thomas F. and Yano, Junko},
abstractNote = {Multielectron catalytic reactions, such as water oxidation, nitrogen reduction, or hydrogen production in enzymes and inorganic catalysts often involve multimetallic clusters. In these systems, the reaction takes place between metals or metals and ligands to facilitate charge transfer, bond formation/breaking, substrate binding, and release of products. In this study, we present a method to detect X-ray emission signals from multiple elements simultaneously, which allows for the study of charge transfer and the sequential chemistry occurring between elements. Kβ X-ray emission spectroscopy (XES) probes charge and spin states of metals as well as their ligand environment. A wavelength-dispersive spectrometer based on the von Hamos geometry was used to disperse Kβ signals of multiple elements onto a position detector, enabling an XES spectrum to be measured in a single-shot mode. This overcomes the scanning needs of the scanning spectrometers, providing data free from temporal and normalization errors and therefore ideal to follow sequential chemistry at multiple sites. We have applied this method to study MnOx-based bifunctional electrocatalysts for the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). In particular, we investigated the effects of adding a secondary element, Ni, to form MnNiOx and its impact on the chemical states and catalytic activity, by tracking the redox characteristics of each element upon sweeping the electrode potential. In conclusion, the detection scheme we describe here is general and can be applied to time-resolved studies of materials consisting of multiple elements, to follow the dynamics of catalytic and electron transfer reactions.},
doi = {10.1039/c5cp01023c},
url = {https://www.osti.gov/biblio/1258004}, journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
issn = {1463-9076},
number = 14,
volume = 17,
place = {United States},
year = {2015},
month = {2}
}

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