DataVXACS Energy LettersPaper
journal article·2024-09-13Open access

Long Period Voltage Oscillations Associated with Reaction Changes between CO2 Reduction and H2 Formation in Zero-Gap-Type CO2 Electrochemical Reactor

Nagisa Mikami, Kei Morishita, Takeharu Murakami, Takuya Hosobata, Yutaka Yamagata, Takayo Ogawa, Yoshiharu Mukouyama, Shuji Nakanishi, Joel W. Ager, Katsushi Fujii, Satoshi Wada

ACS Energy Letters· Volume 9· Issue 9
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Source abstract

Abstract

High Resolution Image Download MS PowerPoint Slide Zero-gap-type reactors with gas diffusion electrodes (GDE) that facilitate the CO 2 reduction reaction (CO 2 RR) are attractive due to their high current density and low applied voltage. These reactors, however, suffer from salt precipitation and anolyte flooding of the cathode, leading to a short lifetime. Here, using a zero-gap reactor with a transparent cathode end plate, we report periodic voltage oscillations under constant current operation. Increases in cell voltages occur at the same time as the reactor switches from the hydrogen evolution reaction (HER) to predominant CO 2 RR; decreases in cell voltage occur with the switch from the CO 2 RR to HER. Further, real time visual observations show that salt precipitation occurs during the CO 2 RR, whereas salt dissolution occurs during the HER. Slow flooding triggers the transition from the CO 2 RR to HER. A number of processes combine to slowly reduce the water content in the microporous layer, which triggers the transition back to the CO 2 RR.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: CO2 Reduction Techniques and Catalysts · Electrochemical Analysis and Applications · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Photonics Technology Development Group, RIKEN Center for Advanced Photonics, 2-1 Wako, 351-0198 Saitama, Japan

Ultrahigh Precision Optics Technology Team, RIKEN Center for Advanced Photonics, 2-1 Wako, 351-0198 Saitama, Japan

Division of Science, College of Science and Engineering, Tokyo Denki University, Hatoyama, Saitama 350-0394, Japan

Research Center for Solar Energy Chemistry, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, United States

Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 United States

Funding

New Energy and Industrial Technology Development Organization · Basic Energy Sciences

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