Deactivation of porphyrin metal-organic framework in advanced oxidation process: Photobleaching and underlying mechanism

Shu, Yufei; Liu, Xun; Zhang, Meng; Liu, Bei; Wang, Zhongying

doi:10.1016/j.apcatb.2024.123746

Cited by 4 publications

(1 citation statement)

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“…Though TCPP-based catalysts have been established for many energy-relevant transformations, one key challenge with their implementation is their instability. These and catalysts with similar ligand structures are prone to deactivation. − Indeed, both CoTCPP and FeTCPP at −1.2 V vs SHE (the potential at which the CO 2 RR occurs) show rapid decomposition. The significant change in current indicates that catalyst decomposition and, potentially, precipitation onto the electrode occur in this electrochemical potential regime (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Carbon Dioxide Electroreduction via DNA-Directed Catalyst Immobilization

Fan,

Corbin,

Chung

et al. 2024

JACS Au

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Electrochemical reduction of carbon dioxide (CO2) is a promising route to up-convert this industrial byproduct. However, to perform this reaction with a small-molecule catalyst, the catalyst must be proximal to an electrode surface. Efforts to immobilize molecular catalysts on electrodes have been stymied by the need to optimize the immobilization chemistries on a case-by-case basis. Taking inspiration from nature, we applied DNA as a molecular-scale “Velcro” to investigate the tethering of three porphyrin-based catalysts to electrodes. This tethering strategy improved both the stability of the catalysts and their Faradaic efficiencies (FEs). DNA-catalyst conjugates were immobilized on screen-printed carbon and carbon paper electrodes via DNA hybridization with nearly 100% efficiency. Following immobilization, a higher catalyst stability at relevant potentials is observed. Additionally, lower overpotentials are required for the generation of carbon monoxide (CO). Finally, high FE for CO generation was observed with the DNA-immobilized catalysts as compared to the unmodified small-molecule systems, as high as 79.1% FE for CO at −0.95 V vs SHE using a DNA-tethered catalyst. This work demonstrates the potential of DNA “Velcro” as a powerful strategy for catalyst immobilization. Here, we demonstrated improved catalytic characteristics of molecular catalysts for CO2 valorization, but this strategy is anticipated to be generalizable to any reaction that proceeds in aqueous solutions.

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Section: Resultsmentioning

confidence: 99%