Control of electrons' spin eliminates hydrogen peroxide formation during water splitting
The production of hydrogen through water splitting in a photoelectrochemical cell suffers from an overpotential that limits the efficiencies. In addition, hydrogen-peroxide formation is identified as a competing process affecting the oxidative stability of photoelectrodes. We impose spin-selectivity...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Chemical Society
2017
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| _version_ | 1797095584385990656 |
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| author | Mtangi, W Tassinari, F Vankayala, K Vargas Jentzsch, A Adelizzi, B Palmans, A Fontanesi, C Meijer, E Naaman, R |
| author_facet | Mtangi, W Tassinari, F Vankayala, K Vargas Jentzsch, A Adelizzi, B Palmans, A Fontanesi, C Meijer, E Naaman, R |
| author_sort | Mtangi, W |
| collection | OXFORD |
| description | The production of hydrogen through water splitting in a photoelectrochemical cell suffers from an overpotential that limits the efficiencies. In addition, hydrogen-peroxide formation is identified as a competing process affecting the oxidative stability of photoelectrodes. We impose spin-selectivity by coating the anode with chiral organic semiconductors from helically aggregated dyes as sensitizers; Zn-porphyrins and triarylamines. Hydrogen peroxide formation is dramatically suppressed, while the overall current through the cell, correlating with the water splitting process, is enhanced. Evidence for a strong spin-selection in the chiral semiconductors is presented by magnetic conducting (mc-)AFM measurements, in which chiral and achiral Zn-porphyrins are compared. These findings contribute to our understanding of the underlying mechanism of spin selectivity in multiple electron-transfer reactions and pave the way toward better chiral dye-sensitized photoelectrochemical cells. |
| first_indexed | 2024-03-07T04:29:56Z |
| format | Journal article |
| id | oxford-uuid:cdf47b04-261d-4ad3-a0e9-7983c3b05249 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:29:56Z |
| publishDate | 2017 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:cdf47b04-261d-4ad3-a0e9-7983c3b052492022-03-27T07:32:19ZControl of electrons' spin eliminates hydrogen peroxide formation during water splittingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cdf47b04-261d-4ad3-a0e9-7983c3b05249EnglishSymplectic Elements at OxfordAmerican Chemical Society2017Mtangi, WTassinari, FVankayala, KVargas Jentzsch, AAdelizzi, BPalmans, AFontanesi, CMeijer, ENaaman, RThe production of hydrogen through water splitting in a photoelectrochemical cell suffers from an overpotential that limits the efficiencies. In addition, hydrogen-peroxide formation is identified as a competing process affecting the oxidative stability of photoelectrodes. We impose spin-selectivity by coating the anode with chiral organic semiconductors from helically aggregated dyes as sensitizers; Zn-porphyrins and triarylamines. Hydrogen peroxide formation is dramatically suppressed, while the overall current through the cell, correlating with the water splitting process, is enhanced. Evidence for a strong spin-selection in the chiral semiconductors is presented by magnetic conducting (mc-)AFM measurements, in which chiral and achiral Zn-porphyrins are compared. These findings contribute to our understanding of the underlying mechanism of spin selectivity in multiple electron-transfer reactions and pave the way toward better chiral dye-sensitized photoelectrochemical cells. |
| spellingShingle | Mtangi, W Tassinari, F Vankayala, K Vargas Jentzsch, A Adelizzi, B Palmans, A Fontanesi, C Meijer, E Naaman, R Control of electrons' spin eliminates hydrogen peroxide formation during water splitting |
| title | Control of electrons' spin eliminates hydrogen peroxide formation during water splitting |
| title_full | Control of electrons' spin eliminates hydrogen peroxide formation during water splitting |
| title_fullStr | Control of electrons' spin eliminates hydrogen peroxide formation during water splitting |
| title_full_unstemmed | Control of electrons' spin eliminates hydrogen peroxide formation during water splitting |
| title_short | Control of electrons' spin eliminates hydrogen peroxide formation during water splitting |
| title_sort | control of electrons spin eliminates hydrogen peroxide formation during water splitting |
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