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Catalysis of the oxygen evolution reaction in strongly acidic electrolytes with earth-abundant crystalline nickel-manganese antimonate

Moreno-Hernandez, Ivan A. and MacFarland, Clara A. and Read, Carlos G. and Papadantonakis, Kimberly and Brunschwig, Bruce S. and Lewis, Nathan S. (2018) Catalysis of the oxygen evolution reaction in strongly acidic electrolytes with earth-abundant crystalline nickel-manganese antimonate. In: 255th American Chemical Society National Meeting & Exposition, March 18-22, 2018, New Orleans, LA. http://resolver.caltech.edu/CaltechAUTHORS:20180413-154320340

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Abstract

Many technologies that store renewable energy in chem. bonds rely on the oxygen evolution reaction (OER) to produce a renewable oxidant. In systems with an alk. electrolyte the OER is catalyzed by earth-abundant oxyhydroxides of the first-row transition metals, whereas systems with acidic electrolytes rely on noble metal oxides such as RuO_2 or IrO_2. The discrepancy in earth-abundance of OER catalysts in alk. and acidic electrolytes corresponds to the thermodn. instability of many first-row transition metal binary oxides in acidic conditions. Understanding how to stabilize first-row transition metals in acidic electrolytes while retaining catalytic activity towards the OER is a key milestone towards the development of scalable renewable energy technologies. We report herein a nickel-manganese antimonate OER electrocatalysts with a rutile-type crystal structure. The crystallinity of the nickel-manganese antimonate catalyst prevents dissoln. of Ni and Mn under operating conditions and at open circuit. The nickel-manganese antimonate catalyst operates at an initial overpotential of 672 ± 9 mV at 10 mA cm^(-2) of geometric c.d., and operates at an overpotential below 745 mV for 168 of continuous operation at 10 mA cm^(-2). The electrode surface, electrode bulk, and electrolyte were characterized with XPS, TEM, SEM, and ICP-MS. Surface and electrolyte measurements indicate initial preferential leaching of Mn from the electrocatalyst, followed by a leach rate of zero for Ni, Mn, and Sb after 120 h of continuous operation. The observations suggest an approach towards the development of earth-abundant, highly-activate electrocatalysts for the oxygen evolution reaction in strongly acidic conditions.


Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription
https://global.acs.org/events/255th-acs-national-meeting-exposition/OrganizationConference Website
ORCID:
AuthorORCID
Moreno-Hernandez, Ivan A.0000-0001-6461-9214
MacFarland, Clara A.0000-0002-9570-948X
Papadantonakis, Kimberly0000-0002-9900-5500
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2018 American Chemical Society.
Record Number:CaltechAUTHORS:20180413-154320340
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180413-154320340
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85854
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Apr 2018 22:55
Last Modified:13 Apr 2018 22:55

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