Electrochemical evidence for catalytic water oxidation mediated by a high-valent cobalt complex

2011 ◽  
Vol 47 (14) ◽  
pp. 4249 ◽  
Author(s):  
Derek J. Wasylenko ◽  
Chelladurai Ganesamoorthy ◽  
Javier Borau-Garcia ◽  
Curtis P. Berlinguette
Keyword(s):  
Water Oxidation ◽  
Cobalt Complex ◽  
High Valent

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

Electrocatalytic water oxidation by a molecular cobalt complex through a high valent cobalt oxo intermediate

2016 ◽  
Vol 52 (79) ◽  
pp. 11787-11790 ◽  
Author(s):  
Debasree Das ◽  
Santanu Pattanayak ◽  
Kundan K. Singh ◽  
Bikash Garai ◽  
Sayam Sen Gupta
Keyword(s):  
Water Oxidation ◽  
Cobalt Complex ◽  
High Valent

Biuret-modified tetraamidomacrocyclic cobalt complex [CoIII-bTAML]− is shown to catalyze electrochemical water oxidation at basic pH leading to the formation of O2.

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

Electrocatalytic Water Oxidation by a Phosphorus–Nitrogen O═PN3-Pincer Cobalt Complex

2020 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Sudipta Chatterjee ◽  
Atanu Rana ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Cobalt Complex

Photochemical water oxidation by cyclometalated iridium(iii) complexes: a mechanistic insight

2016 ◽  
Vol 52 (19) ◽  
pp. 3840-3843 ◽  
Author(s):  
Sujay Mukhopadhyay ◽  
Roop Shikha Singh ◽  
Arnab Biswas ◽  
Daya Shankar Pandey
Keyword(s):  
Water Oxidation ◽  
Catalytic Cycle ◽  
Mechanistic Insight ◽  
High Valent

Three cyclometalated Ir(iii) complexes for photochemical water oxidation with the realization of high valent iridium in the catalytic cycle are presented.

A mononuclear cobalt complex with an organic ligand acting as a precatalyst for efficient visible light-driven water oxidation

2014 ◽  
Vol 50 (17) ◽  
pp. 2167-2169 ◽  
Author(s):  
Shao Fu ◽  
Yongdong Liu ◽  
Yong Ding ◽  
Xiaoqiang Du ◽  
Fangyuan Song ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Cobalt Complex ◽  
Organic Ligand ◽  
Mononuclear Cobalt ◽  
Visible Light Driven

A precatalyst N,N′-bis(salicylidene)ethylenediaminecobalt(ii) showed a TON of 854 and a TOFinitial of 6.4 s−1 for efficient visible light-driven water oxidation.

Tracking the FeIV(O) intermediate and O–O bond formation of a nonheme iron catalyst for water oxidation

2017 ◽  
Vol 53 (65) ◽  
pp. 9063-9066 ◽  
Author(s):  
Bing Yang ◽  
Qing-Qing Yang ◽  
Xin Jiang ◽  
Bin Chen ◽  
Chen-Ho Tung ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Water Oxidation ◽  
Iron Catalyst ◽  
Bond Formation ◽  
Nonheme Iron ◽  
High Valent

We describe here a new complex 1 by subtle modulation of the TPA ligand and succeed in capturing the high-valent FeIV(O) species, which is responsible for the O–O bond formation and oxygen evolution with higher efficiency.

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