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High-Throughput Bubble Screening Method for Combinatorial Discovery of Electrocatalysts for Water Splitting

Xiang, Chengxiang and Suram, Santosh K. and Haber, Joel A. and Guevarra, Dan W. and Soedarmadji, Ed and Jin, Jian and Gregoire, John M. (2014) High-Throughput Bubble Screening Method for Combinatorial Discovery of Electrocatalysts for Water Splitting. ACS Combinatorial Science, 16 (2). pp. 47-52. ISSN 2156-8952. doi:10.1021/co400151h.

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Combinatorial synthesis and screening for discovery of electrocatalysts has received increasing attention, particularly for energy-related technologies. High-throughput discovery strategies typically employ a fast, reliable initial screening technique that is able to identify active catalyst composition regions. Traditional electrochemical characterization via current–voltage measurements is inherently throughput-limited, as such measurements are most readily performed by serial screening. Parallel screening methods can yield much higher throughput and generally require the use of an indirect measurement of catalytic activity. In a water-splitting reaction, the change of local pH or the presence of oxygen and hydrogen in the solution can be utilized for parallel screening of active electrocatalysts. Previously reported techniques for measuring these signals typically function in a narrow pH range and are not suitable for both strong acidic and basic environments. A simple approach to screen the electrocatalytic activities by imaging the oxygen and hydrogen bubbles produced by the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is reported here. A custom built electrochemical cell was employed to record the bubble evolution during the screening, where the testing materials were subject to desired electrochemical potentials. The transient of the bubble intensity obtained from the screening was quantitatively analyzed to yield a bubble figure of merit (FOM) that represents the reaction rate. Active catalysts in a pseudoternary material library, (Ni–Fe–Co)O_x, which contains 231 unique compositions, were identified in less than one minute using the bubble screening method. An independent, serial screening method on the same material library exhibited excellent agreement with the parallel bubble screening. This general approach is highly parallel and is independent of solution pH.

Item Type:Article
Related URLs:
URLURL TypeDescription
Xiang, Chengxiang0000-0002-1698-6754
Suram, Santosh K.0000-0001-8170-2685
Haber, Joel A.0000-0001-7847-5506
Guevarra, Dan W.0000-0002-9592-3195
Gregoire, John M.0000-0002-2863-5265
Additional Information:© 2013 American Chemical Society. Received: November 26, 2013; Revised: December 24, 2013; Publication Date (Web): December 30, 2013. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC000499.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Subject Keywords:high-throughput screening, electrocatalyst, water-splitting, oxygen evolution reaction, inkjet printing
Issue or Number:2
Record Number:CaltechAUTHORS:20140127-093320786
Persistent URL:
Official Citation:Xiang, C., Suram, S. K., Haber, J. A., Guevarra, D. W., Soedarmadji, E., Jin, J., & Gregoire, J. M. (2013). High-Throughput Bubble Screening Method for Combinatorial Discovery of Electrocatalysts for Water Splitting. ACS Combinatorial Science. doi: 10.1021/co400151h
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43519
Deposited By: Tony Diaz
Deposited On:30 Jan 2014 00:04
Last Modified:10 Nov 2021 16:39

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