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Title: Rutile Alloys in the Mn–Sb–O System Stabilize Mn 3+ To Enable Oxygen Evolution in Strong Acid

Abstract

Electrocatalysis of the oxygen evolution reaction is central to several energy technologies including electrolyzers, solar fuel generators, and air-breathing batteries. Strong acid electrolytes are desirable for many implementations of these technologies, although the deployment of such device designs is often hampered by the lack of non-precious-metal oxygen evolution electrocatalysts, with Ir-based oxides comprising the only known catalysts that exhibit stable activity at low overpotential. During our exploration of the Mn-Sb-O system for precious-metal-free electrocatalysts, we discovered that Mn can be incorporated into the rutile oxide structure at much higher concentrations than previously known, and that these Mn-rich rutile alloys exhibit great catalytic activity with current densities exceeding 50 mA cm -2 at 0.58 V overpotential and catalysis onset at 0.3 V overpotential. While this activity does not surpass that of IrO 2, Pourbaix analysis reveals that the Mn-Sb rutile oxide alloys have the same or better thermodynamic stability under operational conditions. By combining combinatorial composition, structure, and activity mapping with synchrotron X-ray absorption measurements and first-principles materials chemistry calculations, we provide a comprehensive understanding of these oxide alloys and identify the critical role of Sb in stabilizing the trivalent Mn octahedra that have been shown to be effective oxygen evolutionmore » reaction (OER) catalysts.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1530318
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 8; Journal Issue: 12; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Zhou, Lan, Shinde, Aniketa, Montoya, Joseph H., Singh, Arunima, Gul, Sheraz, Yano, Junko, Ye, Yifan, Crumlin, Ethan J., Richter, Matthias H., Cooper, Jason K., Stein, Helge S., Haber, Joel A., Persson, Kristin A., and Gregoire, John M. Rutile Alloys in the Mn–Sb–O System Stabilize Mn3+ To Enable Oxygen Evolution in Strong Acid. United States: N. p., 2018. Web. doi:10.1021/acscatal.8b02689.
Zhou, Lan, Shinde, Aniketa, Montoya, Joseph H., Singh, Arunima, Gul, Sheraz, Yano, Junko, Ye, Yifan, Crumlin, Ethan J., Richter, Matthias H., Cooper, Jason K., Stein, Helge S., Haber, Joel A., Persson, Kristin A., & Gregoire, John M. Rutile Alloys in the Mn–Sb–O System Stabilize Mn3+ To Enable Oxygen Evolution in Strong Acid. United States. doi:10.1021/acscatal.8b02689.
Zhou, Lan, Shinde, Aniketa, Montoya, Joseph H., Singh, Arunima, Gul, Sheraz, Yano, Junko, Ye, Yifan, Crumlin, Ethan J., Richter, Matthias H., Cooper, Jason K., Stein, Helge S., Haber, Joel A., Persson, Kristin A., and Gregoire, John M. Tue . "Rutile Alloys in the Mn–Sb–O System Stabilize Mn3+ To Enable Oxygen Evolution in Strong Acid". United States. doi:10.1021/acscatal.8b02689. https://www.osti.gov/servlets/purl/1530318.
@article{osti_1530318,
title = {Rutile Alloys in the Mn–Sb–O System Stabilize Mn3+ To Enable Oxygen Evolution in Strong Acid},
author = {Zhou, Lan and Shinde, Aniketa and Montoya, Joseph H. and Singh, Arunima and Gul, Sheraz and Yano, Junko and Ye, Yifan and Crumlin, Ethan J. and Richter, Matthias H. and Cooper, Jason K. and Stein, Helge S. and Haber, Joel A. and Persson, Kristin A. and Gregoire, John M.},
abstractNote = {Electrocatalysis of the oxygen evolution reaction is central to several energy technologies including electrolyzers, solar fuel generators, and air-breathing batteries. Strong acid electrolytes are desirable for many implementations of these technologies, although the deployment of such device designs is often hampered by the lack of non-precious-metal oxygen evolution electrocatalysts, with Ir-based oxides comprising the only known catalysts that exhibit stable activity at low overpotential. During our exploration of the Mn-Sb-O system for precious-metal-free electrocatalysts, we discovered that Mn can be incorporated into the rutile oxide structure at much higher concentrations than previously known, and that these Mn-rich rutile alloys exhibit great catalytic activity with current densities exceeding 50 mA cm-2 at 0.58 V overpotential and catalysis onset at 0.3 V overpotential. While this activity does not surpass that of IrO2, Pourbaix analysis reveals that the Mn-Sb rutile oxide alloys have the same or better thermodynamic stability under operational conditions. By combining combinatorial composition, structure, and activity mapping with synchrotron X-ray absorption measurements and first-principles materials chemistry calculations, we provide a comprehensive understanding of these oxide alloys and identify the critical role of Sb in stabilizing the trivalent Mn octahedra that have been shown to be effective oxygen evolution reaction (OER) catalysts.},
doi = {10.1021/acscatal.8b02689},
journal = {ACS Catalysis},
number = 12,
volume = 8,
place = {United States},
year = {2018},
month = {10}
}

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