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Cation-Coupled Electron Hopping and Catalysis of Electrochemical Reactions in Metal-Organic Frameworks

Photo_BASF_Sascha
Jun 05, 2023 | 12:00
Where: ICIQ Auditorium Prof. Dr. Kilian Muñiz
Lecturer: Prof. Sascha Ott
University: Uppsala Universitet, Sweden
More information: Lecturer web page
2023-06-05 12:00:00 2023-06-05 13:00:00 Europe/Paris Cation-Coupled Electron Hopping and Catalysis of Electrochemical Reactions in Metal-Organic Frameworks ICIQ Auditorium Prof. Dr. Kilian Muñiz Lecturer: Prof. Sascha Ott Uppsala Universitet, Sweden

Abstract

Owing to their large internal surface area, their porosity and synthetic tunability, metal-organic frameworks (MOFs) have become appealing materials for a variety of applications, like supercapacitors, electrochromic materials, and hosts for molecular catalysts. Amongst MOFs that are electrically conducting, those that propagate charge transport by a diffusional electron hopping mechanism are a rich research field, both from a fundamental as well as applied viewpoint.[1]

In this seminar, we will discuss a variety of MOFs that contain electronically isolated linkers, and determine factors that govern charge transport.[2] Particular focus will be given to understand the coupling between electron and cation transport, and its implications for redox-conductivity.[3] Electroactive MOFs can also serve to extract minority carriers from underlying semiconductors (SCs) upon illumination. Such SC-MOF hybrids can offer high photovoltages, and we identify different regimes that may limit current densities.[4] Finally, a MOF where all linkers are cobaloxime hydrogen evolution catalysts (UU-100; see Figure) will be presented. When grown on glassy carbon, UU-100 sustains electrochemical hydrogen evolution for at least 18 hours at constant current density without signs of decomposition.[5]

 

Figure. UU-100 consisting of cobaloxime linkers for electrochemical HER

 

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References:

[1]        B. A. Johnson, A. M. Beiler, B. D. McCarthy, S. Ott, J. Am. Chem. Soc. 2020, 142, 11941-11956.

[2]        a) B. A. Johnson, A. Bhunia, H. Fei, S. M. Cohen, S. Ott, J. Am. Chem. Soc. 2018, 140, 2985-2994; b) A. T. Castner, B. A. Johnson, S. M. Cohen, S. Ott, J. Am. Chem. Soc. 2021, 143, 7991-7999.

[3]        a) A. T. Castner, H. Su, E. Svensson Grape, A. K. Inge, B. A. Johnson, M. S. G. Ahlquist, S. Ott, J. Am. Chem. Soc. 2022, 144, 5910-5920; b) A. K. J. Li, B. A. Johnson, S. Ott, https://doi.org/10.21203/rs.3.rs-2568775/v1 2023.

[4]        A. M. Beiler, B. D. McCarthy, B. A. Johnson, S. Ott, Nat. Commun. 2020, 11, 5819.

[5]        S. Roy, Z. Huang, A. Bhunia, A. Castner, A. K. Gupta, X. Zou, S. Ott, J. Am. Chem. Soc. 2019, 141, 15942-15950.