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HO is a bulk chemical used as "green" alternative in a variety of applications, but has an energy and waste intensive production method. The electrochemical O reduction to HO is viable alternative with examples of the direct production of up to 20% HO solutions. In that respect, we found that the dinuclear complex Cu(btmpa) (6,6'-bis[[bis(2-pyridylmethyl)amino]methyl]-2,2'-bipyridine) reduces O to HO with a selectivity up to 90 % according to single linear sweep rotating ring disk electrode measurements. Microbalance experiments showed that complex reduction leads to surface adsorption thereby increasing the catalytic current. More importantly, we kept a high Faradaic efficiency for HO between 60 and 70 % over the course of 2 h of amperometry by introducing high potential intervals to strip deposited copper (Cu). This is the first example of extensive studies into the long term electrochemical O to HO reduction by a molecular complex which allowed to retain the high intrinsic selectivity of Cu(btmpa) towards HO production leading to relevant levels of HO.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9305592 | PMC |
| http://dx.doi.org/10.1002/celc.202101692 | DOI Listing |
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