Elucidating Electrocatalytic Oxygen Reduction Kinetics via Intermediates by Time-Dependent Electrochemiluminescence.
Kaiqing WuRan ChenZhixin ZhouXinghua ChenYanqin LvJin MaYanfei ShenSongqin LiuFrank C J M van VeggelPublished in: Angewandte Chemie (International ed. in English) (2023)
Facile evaluation of oxygen reduction reaction (ORR) kinetics for electrocatalysts is critical for sustainable fuel-cell development and industrial H 2 O 2 production. Despite great success in ORR studies using mainstream strategies, such as the membrane electrode assembly, rotation electrodes, and advanced surface-sensitive spectroscopy, the time and spatial distribution of reactive oxygen species (ROS) intermediates in the diffusion layer remain unknown. Using time-dependent electrochemiluminescence (Td-ECL), we report an intermediate-oriented method for ORR kinetics analysis. Owing to multiple ultrasensitive stoichiometric reactions between ROS and the ECL emitter, except for electron transfer numbers and rate constants, the potential-dependent time and spatial distribution of ROS were successfully obtained for the first time. Such exclusively uncovered information would guide the development of electrocatalysts for fuel cells and H 2 O 2 production with maximized activity and durability.
Keyphrases
- reactive oxygen species
- electron transfer
- cell death
- reduced graphene oxide
- dna damage
- induced apoptosis
- quantum dots
- cell cycle arrest
- sensitive detection
- gold nanoparticles
- solid state
- single cell
- heavy metals
- energy transfer
- aqueous solution
- cell therapy
- wastewater treatment
- healthcare
- risk assessment
- climate change
- health information
- cell proliferation
- highly efficient
- human health
- bone marrow
- molecularly imprinted
- solid phase extraction