scholarly journals Comparison of photoelectrochemical water oxidation activity of a synthetic photocatalyst system with photosystem II

2014 ◽  
Vol 176 ◽  
pp. 199-211 ◽  
Author(s):  
Yi-Hsuan Lai ◽  
Masaru Kato ◽  
Dirk Mersch ◽  
Erwin Reisner
Keyword(s):  
Photosystem Ii ◽  
Indium Tin Oxide ◽  
Water Oxidation ◽  
Charge Separation ◽  
High Energy ◽  
Oxidation Catalysis ◽  
Hydrogen Electrode ◽  
Oxidation Activity ◽  
Indium Tin Oxide Electrode ◽  
Onset Potential

This discussion describes a direct comparison of photoelectrochemical (PEC) water oxidation activity between a photosystem II (PSII)-functionalised photoanode and a synthetic nanocomposite photoanode. The semi-biological photoanode is composed of PSII from the thermophilic cyanobacterium Thermosynechococcus elongatus on a mesoporous indium tin oxide electrode (mesoITO|PSII). PSII embeds all of the required functionalities for light absorption, charge separation and water oxidation and ITO serves solely as the electron collector. The synthetic photoanode consists of a TiO2 and NiOx coated nanosheet-structured WO3 electrode (nanoWO3|TiO2|NiOx). The composite structure of the synthetic electrode allows mimicry of the functional key features in PSII: visible light is absorbed by WO3, TiO2 serves as a protection and charge separation layer and NiOx serves as the water oxidation electrocatalyst. MesoITO|PSII uses low energy red light, whereas nanoWO3|TiO2|NiOx requires high energy photons of blue-end visible and UV regions to oxidise water. The electrodes have a comparable onset potential at approximately 0.6 V vs. reversible hydrogen electrode (RHE). MesoITO|PSII reaches its saturation photocurrent at 0.84 V vs. RHE, whereas nanoWO3|TiO2|NiOx requires more than 1.34 V vs. RHE. This suggests that mesoITO|PSII suffers from fewer limitations from charge recombination and slow water oxidation catalysis than the synthetic electrode. MesoITO|PSII displays a higher ‘per active’ site activity, but is less photostable and displays a much lower photocurrent per geometrical surface area and incident photon to current conversion efficiency (IPCE) than nanoWO3|TiO2|NiOx.

scholarly journals Regulation of Ferroelectric Polarization to Achieve Efficient Charge Separation and Transfer in Particulate RuO 2 /BiFeO 3 for High Photocatalytic Water Oxidation Activity

Small ◽  
2021 ◽  
Vol 17 (3) ◽  
pp. 2007044
Author(s):  
Jafar H. Shah ◽  
Biaohong Huang ◽  
Ahmed M. Idris ◽  
Yong Liu ◽  
Anum S. Malik ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Charge Separation ◽  
Ferroelectric Polarization ◽  
Oxidation Activity ◽  
Efficient Charge

Regulation of Ferroelectric Polarization to Achieve Efficient Charge Separation and Transfer in Particulate RuO 2 /BiFeO 3 for High Photocatalytic Water Oxidation Activity

Small ◽  
2020 ◽  
Vol 16 (44) ◽  
pp. 2003361
Author(s):  
Jafar H. Shah ◽  
Biaohong Huang ◽  
Ahmed M. Idris ◽  
Yong Liu ◽  
Anum S. Malik ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Charge Separation ◽  
Ferroelectric Polarization ◽  
Oxidation Activity ◽  
Efficient Charge

Enhancement of photoelectrochemical oxidation by an amorphous nickel boride catalyst on porous BiVO4

Nanoscale ◽  
2017 ◽  
Vol 9 (42) ◽  
pp. 16133-16137 ◽  
Author(s):  
Ke Dang ◽  
Xiaoxia Chang ◽  
Tuo Wang ◽  
Jinlong Gong
Keyword(s):  
Water Oxidation ◽  
Reversible Hydrogen Electrode ◽  
Hydrogen Electrode ◽  
Nickel Boride ◽  
Onset Potential ◽  
Photoelectrochemical Oxidation ◽  
Photoelectrochemical Water Oxidation

This paper describes an amorphous nickel boride (NiB) electrocatalyst loaded on porous BiVO4 for photoelectrochemical water oxidation. The NiB/BiVO4 photoanode exhibits an onset potential of 0.25 V versus the reversible hydrogen electrode (vs. RHE) and a photocurrent of 3.47 mA cm−2 at 1.23 V vs. RHE under simulated 100 mW cm−2 irradiation.

Pivotal role of the redox-active tyrosine in driving the water splitting catalyzed by photosystem II

2020 ◽  
Vol 22 (1) ◽  
pp. 273-285 ◽  
Author(s):  
Shin Nakamura ◽  
Matteo Capone ◽  
Daniele Narzi ◽  
Leonardo Guidoni
Keyword(s):  
Hydrogen Bond ◽  
Photosystem Ii ◽  
Water Splitting ◽  
Oxidation State ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Pivotal Role ◽  
Redox Active ◽  
Water Oxidation Catalysis

TyrZ oxidation state triggers hydrogen bond modification in the water oxidation catalysis.

Se doping: an effective strategy toward Fe2O3 nanorod arrays for greatly enhanced solar water oxidation

2017 ◽  
Vol 5 (24) ◽  
pp. 12086-12090 ◽  
Author(s):  
Rong Zhang ◽  
Lin Yang ◽  
Xueni Huang ◽  
Tao Chen ◽  
Fengli Qu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Light Irradiation ◽  
Effective Strategy ◽  
Nanorod Arrays ◽  
Oxidation Activity ◽  
Onset Potential ◽  
Solar Water ◽  
Se Doping ◽  
Solar Water Oxidation

Se doped Fe2O3 nanorod arrays (Se-Fe2O3) show superior solar water oxidation activity driving 1.44 mA cm−2 at 1.23 V vs. the RHE in 1.0 M NaOH under simulated light irradiation, 3.13 times that of pure Fe2O3, with a 90 mV cathodic shift of onset potential.

A molecular ruthenium catalyst with water-oxidation activity comparable to that of photosystem II

2012 ◽  
Vol 4 (5) ◽  
pp. 418-423 ◽  
Author(s):  
Lele Duan ◽  
Fernando Bozoglian ◽  
Sukanta Mandal ◽  
Beverly Stewart ◽  
Timofei Privalov ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Water Oxidation ◽  
Ruthenium Catalyst ◽  
Oxidation Activity

scholarly journals An Iron(III) Complex with Pincer Ligand—Catalytic Water Oxidation through Controllable Ligand Exchange

Reactions ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 16-36
Author(s):  
Sahir M. Al-Zuraiji ◽  
Dávid Lukács ◽  
Miklós Németh ◽  
Krisztina Frey ◽  
Tímea Benkó ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Water Oxidation ◽  
Active Form ◽  
Oxidation Catalysis ◽  
Molecular Water ◽  
Pincer Ligands ◽  
Pincer Ligand ◽  
X Ray ◽  
Water Oxidation Catalysis

Pincer ligands occupy three coplanar sites at metal centers and often support both stability and reactivity. The five-coordinate [FeIIICl2(tia-BAI)] complex (tia-BAI− = 1,3-bis(2’-thiazolylimino)isoindolinate(−)) was considered as a potential pre-catalyst for water oxidation providing the active form via the exchange of chloride ligands to water molecules. The tia-BAI− pincer ligand renders water-insolubility to the Fe–(tia-BAI) assembly, but it tolerates the presence of water in acetone and produces electrocatalytic current in cyclic voltammetry associated with molecular water oxidation catalysis. Upon addition of water to [FeIIICl2(tia-BAI)] in acetone the changes in the Fe3+/2+ redox transition and the UV-visible spectra could be associated with solvent-dependent equilibria between the aqua and chloride complex forms. Immobilization of the complex from methanol on indium-tin-oxide (ITO) electrode by means of drop-casting resulted in water oxidation catalysis in borate buffer. The O2 detected by gas chromatography upon electrolysis at pH 8.3 indicates >80% Faraday efficiency by a TON > 193. The investigation of the complex/ITO assembly by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) before and after electrolysis, and re-dissolution tests suggest that an immobilized molecular catalyst is responsible for catalysis and de-activation occurs by depletion of the metal.

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