Induction of Concerted Proton-Coupled Electron Transfer during Oxygen Evolution on Hematite Using Lanthanum Oxide as a Solid Proton Acceptor

ACS Catalysis ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 9212-9215 ◽  
Author(s):  
Toshihiro Takashima ◽  
Koki Ishikawa ◽  
Hiroshi Irie
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Lanthanum Oxide ◽  
Proton Acceptor ◽  
Proton Coupled Electron Transfer

Efficient oxygen evolution on hematite at neutral pH enabled by proton-coupled electron transfer

2016 ◽  
Vol 52 (97) ◽  
pp. 14015-14018 ◽  
Author(s):  
Toshihiro Takashima ◽  
Koki Ishikawa ◽  
Hiroshi Irie
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Transfer Process ◽  
Electron Transfer Process ◽  
Neutral Ph ◽  
Proton Coupled Electron Transfer

The oxygen evolution activity of hematite at neutral pH was enhanced by inducing the concerted proton-coupled electron transfer process.

Proton-coupled electron transfer chemistry of hangman macrocycles: Hydrogen and oxygen evolution reactions

2015 ◽  
Vol 19 (01-03) ◽  
pp. 1-8 ◽  
Author(s):  
Dilek K. Dogutan ◽  
D. Kwabena Bediako ◽  
Daniel J. Graham ◽  
Christopher M. Lemon ◽  
Daniel G. Nocera
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Coordination Sphere ◽  
High Energy ◽  
Solar Fuels ◽  
Acid Base ◽  
Proton Coupled Electron Transfer ◽  
Secondary Coordination Sphere ◽  
Constituent Elements ◽  
Kinetics Of

The splitting of water into its constituent elements is an important solar fuels conversion reaction for the storage of renewable energy. For each of the half reactions of the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), multiple protons and electrons must be coupled to avoid high-energy intermediates. To understand the mechanistic details of the PCET chemistry that underpins HER and OER, we have designed hangman porphyrin and corrole catalysts. In these hangman constructs, a pendant acid/base functionality within the secondary coordination sphere is "hung" above the macrocyclic redox platform on which substrate binds. The two critical thermodynamic properties of a PCET event, the redox potential and pKa may be tuned with the macrocycle and hanging group, respectively. This review outlines the synthesis of these catalysts, as well as the examination of the PCET kinetics of hydrogen and oxygen evolution by the hangman catalysts. The insights provided by these systems provide a guide for the design of future HER and OER catalysts that use a secondary coordination sphere to manage PCET.

scholarly journals Proton-Coupled Electron Transfer from Tyrosine in the Interior of a de novo Protein: Mechanisms and Primary Proton Acceptor

2020 ◽  
Vol 142 (26) ◽  
pp. 11550-11559 ◽  
Author(s):  
Astrid Nilsen-Moe ◽  
Clorice R. Reinhardt ◽  
Starla D. Glover ◽  
Li Liang ◽  
Sharon Hammes-Schiffer ◽  
...  
Keyword(s):  
Electron Transfer ◽  
De Novo ◽  
Proton Acceptor ◽  
Primary Proton ◽  
Proton Coupled Electron Transfer
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