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Multisample Correlation Reveals the Origin of the Photocurrent of an Unstable Cu2O Photocathode during CO2Reduction

Journal Article


Abstract


  • The reliable characterization of the photoelectrochemical (PEC) performance of unstable photoelectrodes, often the simplest devices used as a baseline, is a huge challenge. By performing a correlation analysis of more than 100 parameters of Cu2O photocathodes electrodeposited under the same conditions, we discovered a strong positive correlation (R = 0.866) between the photocurrent in argon and the deposition current peak magnitude during electrodeposition, while a strong negative correlation (R = -0.787) was found in CO2. In argon, a positive correlation between the photocurrent during PEC tests and the post-PEC dark current suggests the dominance of photodegradation. In CO2, the higher photocurrent in PEC tests correlates well with the lower post-PEC dark current, revealing the dominance of photocatalytic CO2 reduction during the rapid PEC tests. Correlation analysis provides statistically robust insights into the operation of unstable electrodes based on routinely measured parameters and thus constitutes a simple yet previously unexplored methodology for characterizing photoelectrodes within the first minutes of operation.

Publication Date


  • 2021

Citation


  • Kim, K., Peleckis, G., Wagner, K., & Mozer, A. J. (2021). Multisample Correlation Reveals the Origin of the Photocurrent of an Unstable Cu2O Photocathode during CO2Reduction. Journal of Physical Chemistry Letters, 12(34), 8157-8163. doi:10.1021/acs.jpclett.1c02280

Scopus Eid


  • 2-s2.0-85114436986

Start Page


  • 8157

End Page


  • 8163

Volume


  • 12

Issue


  • 34

Place Of Publication


Abstract


  • The reliable characterization of the photoelectrochemical (PEC) performance of unstable photoelectrodes, often the simplest devices used as a baseline, is a huge challenge. By performing a correlation analysis of more than 100 parameters of Cu2O photocathodes electrodeposited under the same conditions, we discovered a strong positive correlation (R = 0.866) between the photocurrent in argon and the deposition current peak magnitude during electrodeposition, while a strong negative correlation (R = -0.787) was found in CO2. In argon, a positive correlation between the photocurrent during PEC tests and the post-PEC dark current suggests the dominance of photodegradation. In CO2, the higher photocurrent in PEC tests correlates well with the lower post-PEC dark current, revealing the dominance of photocatalytic CO2 reduction during the rapid PEC tests. Correlation analysis provides statistically robust insights into the operation of unstable electrodes based on routinely measured parameters and thus constitutes a simple yet previously unexplored methodology for characterizing photoelectrodes within the first minutes of operation.

Publication Date


  • 2021

Citation


  • Kim, K., Peleckis, G., Wagner, K., & Mozer, A. J. (2021). Multisample Correlation Reveals the Origin of the Photocurrent of an Unstable Cu2O Photocathode during CO2Reduction. Journal of Physical Chemistry Letters, 12(34), 8157-8163. doi:10.1021/acs.jpclett.1c02280

Scopus Eid


  • 2-s2.0-85114436986

Start Page


  • 8157

End Page


  • 8163

Volume


  • 12

Issue


  • 34

Place Of Publication