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A nickel (II) PY5 complex as an electrocatalyst for water oxidation

Wang, Lei LU ; Duan, Lele ; Ambre, Ram B. ; Daniel, Quentin ; Chen, Hong ; Sun, Junliang ; Das, Biswanath LU ; Thapper, Anders LU ; Uhlig, Jens LU and Dinér, Peter , et al. (2016) In Journal of Catalysis 335. p.72-78
Abstract
A Ni-PY5 [PY5 = 2,6-bis(1,1-bis(2-pyridyl)ethyl)pyridine)] complex has been found to act as an electrocatalyst for oxidizing water to dioxygen in aqueous phosphate buffer solutions. The rate of water oxidation catalyzed by the Ni-PY5 is remarkably enhanced by the proton acceptor base HPO42−, with rate constant of 1820 M−1 s−1. Controlled potential bulk electrolysis with Ni-PY5 at pH 10.8 under an applied potential of 1.5 V vs. normal hydrogen electrode (NHE) resulted in dioxygen formation with a high faradaic efficiency over 90%. A detailed mechanistic study identifies the water nucleophilic attack pathway for water oxidation catalysis.
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Catalysis
volume
335
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:84954413362
  • wos:000371098200007
ISSN
0021-9517
DOI
10.1016/j.jcat.2015.12.003
language
English
LU publication?
yes
id
11887302-41f9-40d2-a6cc-1b58847d3a59
date added to LUP
2016-04-14 06:07:00
date last changed
2022-04-08 20:02:38
@article{11887302-41f9-40d2-a6cc-1b58847d3a59,
  abstract     = {{A Ni-PY5 [PY5 = 2,6-bis(1,1-bis(2-pyridyl)ethyl)pyridine)] complex has been found to act as an electrocatalyst for oxidizing water to dioxygen in aqueous phosphate buffer solutions. The rate of water oxidation catalyzed by the Ni-PY5 is remarkably enhanced by the proton acceptor base HPO42−, with rate constant of 1820 M−1 s−1. Controlled potential bulk electrolysis with Ni-PY5 at pH 10.8 under an applied potential of 1.5 V vs. normal hydrogen electrode (NHE) resulted in dioxygen formation with a high faradaic efficiency over 90%. A detailed mechanistic study identifies the water nucleophilic attack pathway for water oxidation catalysis.}},
  author       = {{Wang, Lei and Duan, Lele and Ambre, Ram B. and Daniel, Quentin and Chen, Hong and Sun, Junliang and Das, Biswanath and Thapper, Anders and Uhlig, Jens and Dinér, Peter and Sun, Licheng}},
  issn         = {{0021-9517}},
  language     = {{eng}},
  month        = {{03}},
  pages        = {{72--78}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Catalysis}},
  title        = {{A nickel (II) PY5 complex as an electrocatalyst for water oxidation}},
  url          = {{http://dx.doi.org/10.1016/j.jcat.2015.12.003}},
  doi          = {{10.1016/j.jcat.2015.12.003}},
  volume       = {{335}},
  year         = {{2016}},
}