Cobalt corroles with phosphonic acid pendants as catalysts for oxygen and hydrogen evolution from neutral aqueous solution

2017 ◽  
Vol 53 (46) ◽  
pp. 6195-6198 ◽  
Author(s):  
Huiling Sun ◽  
Yongzhen Han ◽  
Haitao Lei ◽  
Mingxing Chen ◽  
Rui Cao
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Evolution ◽  
Coordination Sphere ◽  
Phosphonic Acid ◽  
Acid Base ◽  
Secondary Coordination Sphere ◽  
Neutral Aqueous Solution

The acid/base pendants at the secondary coordination sphere of cobalt corroles play significant roles in OER and HER.

Highly efficient electrocatalytic hydrogen evolution from neutral aqueous solution by a water-soluble anionic cobalt(ii) porphyrin

2015 ◽  
Vol 51 (81) ◽  
pp. 15067-15070 ◽  
Author(s):  
Belete B. Beyene ◽  
Sandeep B. Mane ◽  
Chen-Hsiung Hung
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Evolution ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
Water Soluble ◽  
Applied Potential ◽  
Buffer Solution ◽  
Faradaic Efficiency ◽  
Highly Efficient ◽  
Neutral Aqueous Solution

CoTPPS is an efficient electrocatalyst for H2 generation from neutral phosphate buffer solution. It features quantitative Faradaic efficiency with a TOF of ∼1.83 s−1 and a TON of 1.9 × 104 mol of H2 per mole of catalyst at an applied potential of −1.29 V (vs. SHE).

Electrosynthesis of NiPx nanospheres for electrocatalytic hydrogen evolution from a neutral aqueous solution

2017 ◽  
Vol 53 (40) ◽  
pp. 5507-5510 ◽  
Author(s):  
Mingxing Chen ◽  
Jing Qi ◽  
Wei Zhang ◽  
Rui Cao
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Evolution ◽  
Neutral Solution ◽  
Neutral Aqueous Solution

By a simple and fast electrosynthesis method, NiPx nanospheres are deposited on electrode substrates, which could catalyze HER efficiently in a neutral solution.

Photocatalytic hydrogen evolution from neutral aqueous solution by a water-soluble cobalt(ii) porphyrin

2018 ◽  
Vol 2 (9) ◽  
pp. 2036-2043 ◽  
Author(s):  
Belete B. Beyene ◽  
Chen-Hsiung Hung
Keyword(s):  
Aqueous Solution ◽  
Solar Energy ◽  
Hydrogen Evolution ◽  
Energy Demand ◽  
Water Soluble ◽  
Global Energy ◽  
Photocatalytic Hydrogen Evolution ◽  
Promising Strategy ◽  
Efficient Storage ◽  
Neutral Aqueous Solution

Efficient storage of solar energy via light-driven hydrogen evolution is an attractive and promising strategy to address challenges related to increasing global energy demand.

A water-soluble glucose-functionalized cobalt(iii) complex as an efficient electrocatalyst for hydrogen evolution under neutral conditions

2015 ◽  
Vol 44 (4) ◽  
pp. 1526-1529 ◽  
Author(s):  
Xuguang Yin ◽  
Cuibo Liu ◽  
Sifei Zhuo ◽  
You Xu ◽  
Bin Zhang
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Water Soluble ◽  
Neutral Aqueous Solution ◽  
Neutral Conditions

A water-soluble glucose functionalized cobalt(iii) complex [CoIII(dmgH)2(py-glucose)Cl] is active and stable for electrocatalytic hydrogen production in neutral aqueous solution.

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.

Nickel Nanocrystal Assemblies as Efficient Electrocatalysts for Hydrogen Evolution from pH‐Neutral Aqueous Solution

2019 ◽  
Vol 6 (7) ◽  
pp. 2100-2106 ◽  
Author(s):  
Muhammad Imran Abdullah ◽  
Asima Hameed ◽  
Ning Zhang ◽  
Mingming Ma
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Evolution ◽  
Neutral Aqueous Solution

Über den Mechanismus der Bildung von Polyanionen in wäßriger Lösung. Zum Bildungsmechanismus eines Polytetramolybdations [Mo4O144-]n / On the Mechanism of Formation of Polyanions in Aqueous Solution. Concerning the Mechanism of Formation of a Polytetramolybdate Ion [Mo4O144-]n

1976 ◽  
Vol 31 (6) ◽  
pp. 737-748 ◽  
Author(s):  
Karl-Heinz Tytko
Keyword(s):  
Aqueous Solution ◽  
Coordination Sphere ◽  
Analytical Formula ◽  
Reaction Pathways ◽  
Mechanism Of Formation ◽  
X Ray ◽  
Theoretical Considerations

Possible structures and the pertinent reaction pathways for the polymetalate ion present in a slightly soluble polymetalate having the analytical formula A2O · 2 MOs have been derived on the basis of theoretical considerations. Structure and kind of combination of the tetrameric units of one of the possibilities are in agreement with the results of X-ray structure analyses. First the previously proposed planar tetrametalate ion [M4O12(OH)4]4--is formed by stepwise aggregation according to an addition mechanism. This species undergoes a rearrangement of the coordination sphere of two of the M atoms and is then subject to a polycondensation resulting in a polytetrametalate chain, [M4O144-]n.

scholarly journals Using internal electrostatic fields to manipulate the valence manifolds of copper complexes

2021 ◽  
Author(s):  
Alexander B. Weberg ◽  
Samuel P. McCollom ◽  
Laura M. Thierer ◽  
Michael R. Gau ◽  
Patrick J. Carroll ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Copper Complexes ◽  
Photophysical Properties ◽  
Redox Potentials ◽  
Electrostatic Effects ◽  
Electrostatic Fields ◽  
Secondary Coordination Sphere

Secondary coordination sphere electrostatic effects tune the valence manifolds of copper centers, impacting molecular geometries, photophysical properties, and redox potentials.

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