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Title: Dynamic Surface Reconstruction Unifies the Electrocatalytic Oxygen Evolution Performance of Nonstoichiometric Mixed Metal Oxides

Abstract

Compositionally versatile, nonstoichiometric, mixed ionic–electronic conducting metal oxides of the form An+1BnO3n+1 (n = 1 → ∞; A = rare-earth-/alkaline-earth-metal cation; B = transition-metal (TM) cation) remain a highly attractive class of electrocatalysts for catalyzing the energy-intensive oxygen evolution reaction (OER). The current design strategies for describing their OER activities are largely derived assuming a static, unchanged view of their surfaces, despite reports of dynamic structural changes to 3d TM-based perovskites during OER. Herein, through variations in the A- and B-site compositions of An+1BnO3n+1 oxides (n = 1 (A2BO4) or n = ∞ (ABO3); A = La, Sr, Ca; B = Mn, Fe, Co, Ni), we show that, in the absence of electrolyte impurities, surface restructuring is universally the source of high OER activity in these oxides and is dependent on the initial oxide composition. Oxide surface restructuring is induced by irreversible A-site cation dissolution, resulting in in situ formation of a TM oxyhydroxide shell on top of the parent oxide core that serves as the active surface for OER. The rate of surface restructuring is found to depend on (i) composition of A-site cations, with alkaline-earth-metal cations dominating lanthanide cation dissolution, (ii) oxide crystal phase, with n = 1more » A2BO4 oxides exhibiting higher rates of A-site dissolution in comparison to n = ∞ ABO3 perovskites, (iii) lattice strain in the oxide induced by mixed rare-earth- and alkaline-earth-metal cations in the A-site, and (iv) oxide reducibility. Among the in situ generated 3d TM oxyhydroxide structures from An+1BnO3n+1 oxides, Co-based structures are characterized by superior OER activity and stability, even in comparison to as-synthesized Co-oxyhydroxide, pointing to the generation of high active surface area structures through oxide restructuring. These insights are critical toward the development of revised design criteria to include surface dynamics for effectively describing the OER activity of nonstoichiometric mixed-metal oxides.« less

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [3];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan 48202, United States
  2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
  3. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
Publication Date:
Research Org.:
Wayne State Univ., Detroit, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
OSTI Identifier:
1829179
Alternate Identifier(s):
OSTI ID: 1830885; OSTI ID: 1837499
Grant/Contract Number:  
AC02-76SF00515; SC0020953
Resource Type:
Published Article
Journal Name:
JACS Au
Additional Journal Information:
Journal Name: JACS Au Journal Volume: 1 Journal Issue: 12; Journal ID: ISSN 2691-3704
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
surface restructuring; oxygen evolution reaction; perovskites; Ruddlesden−Popper oxides; alkaline electrolyzers; cationic dissolution; structure−performance correlations; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Samira, Samji, Hong, Jiyun, Camayang, John Carl A., Sun, Kai, Hoffman, Adam S., Bare, Simon R., and Nikolla, Eranda. Dynamic Surface Reconstruction Unifies the Electrocatalytic Oxygen Evolution Performance of Nonstoichiometric Mixed Metal Oxides. United States: N. p., 2021. Web. doi:10.1021/jacsau.1c00359.
Samira, Samji, Hong, Jiyun, Camayang, John Carl A., Sun, Kai, Hoffman, Adam S., Bare, Simon R., & Nikolla, Eranda. Dynamic Surface Reconstruction Unifies the Electrocatalytic Oxygen Evolution Performance of Nonstoichiometric Mixed Metal Oxides. United States. https://doi.org/10.1021/jacsau.1c00359
Samira, Samji, Hong, Jiyun, Camayang, John Carl A., Sun, Kai, Hoffman, Adam S., Bare, Simon R., and Nikolla, Eranda. Fri . "Dynamic Surface Reconstruction Unifies the Electrocatalytic Oxygen Evolution Performance of Nonstoichiometric Mixed Metal Oxides". United States. https://doi.org/10.1021/jacsau.1c00359.
@article{osti_1829179,
title = {Dynamic Surface Reconstruction Unifies the Electrocatalytic Oxygen Evolution Performance of Nonstoichiometric Mixed Metal Oxides},
author = {Samira, Samji and Hong, Jiyun and Camayang, John Carl A. and Sun, Kai and Hoffman, Adam S. and Bare, Simon R. and Nikolla, Eranda},
abstractNote = {Compositionally versatile, nonstoichiometric, mixed ionic–electronic conducting metal oxides of the form An+1BnO3n+1 (n = 1 → ∞; A = rare-earth-/alkaline-earth-metal cation; B = transition-metal (TM) cation) remain a highly attractive class of electrocatalysts for catalyzing the energy-intensive oxygen evolution reaction (OER). The current design strategies for describing their OER activities are largely derived assuming a static, unchanged view of their surfaces, despite reports of dynamic structural changes to 3d TM-based perovskites during OER. Herein, through variations in the A- and B-site compositions of An+1BnO3n+1 oxides (n = 1 (A2BO4) or n = ∞ (ABO3); A = La, Sr, Ca; B = Mn, Fe, Co, Ni), we show that, in the absence of electrolyte impurities, surface restructuring is universally the source of high OER activity in these oxides and is dependent on the initial oxide composition. Oxide surface restructuring is induced by irreversible A-site cation dissolution, resulting in in situ formation of a TM oxyhydroxide shell on top of the parent oxide core that serves as the active surface for OER. The rate of surface restructuring is found to depend on (i) composition of A-site cations, with alkaline-earth-metal cations dominating lanthanide cation dissolution, (ii) oxide crystal phase, with n = 1 A2BO4 oxides exhibiting higher rates of A-site dissolution in comparison to n = ∞ ABO3 perovskites, (iii) lattice strain in the oxide induced by mixed rare-earth- and alkaline-earth-metal cations in the A-site, and (iv) oxide reducibility. Among the in situ generated 3d TM oxyhydroxide structures from An+1BnO3n+1 oxides, Co-based structures are characterized by superior OER activity and stability, even in comparison to as-synthesized Co-oxyhydroxide, pointing to the generation of high active surface area structures through oxide restructuring. These insights are critical toward the development of revised design criteria to include surface dynamics for effectively describing the OER activity of nonstoichiometric mixed-metal oxides.},
doi = {10.1021/jacsau.1c00359},
journal = {JACS Au},
number = 12,
volume = 1,
place = {United States},
year = {2021},
month = {11}
}

Journal Article:
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https://doi.org/10.1021/jacsau.1c00359

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