|Bioelectrochemistry and Electrocatalysis. Two Close Sisters|
: 515 : 2019.11.13 11:07
|일시 : 2019.11.13 17:00|
|소속 : Ruhr-University Bochum|
|발표자 : Wolfgang Schuhmann|
|장소 : R404|
In enzyme-based bioelectrochemistry a substrate is converted in the active site of a redox enzyme and the electrons have to be transported to the electrode either by tunnelling or using redox mediators. Nature designed the enzyme integrated active sites to on the one hand achieve extraordinary selectivity in the catalysed reactions and on the other hand to prevent unwanted electron exchange reactions. In contrast, in electrocatalysis the active sites for the catalytic conversion are generally located at the surface of e.g. nanoparticles and hence selectivity is limited due to the less defined molecular structure of the active site. Evidently, also in electrocatalysis electrons have to be transferred between the active site and an underlying current collector. Moreover, in both bioelectrochemistry and electrocatalysis mass transport limitation, local changes of the pH value due to coupled electron-proton-transfer reactions, charge neutrality, counter ion movement are decisive for the reaction.
Using examples from our own research concerning the design of electron transfer pathways in bioelectrochemical and photobioelectrochemical systems as well as in electrocatalysis using gas-diffusion electrodes the similarities of bioelectrochemistry and electrocatalysis will be highlighted.