Unveiling Role of Sulfate Ion in Nickel‐Iron (oxy)Hydroxide with Enhanced Oxygen‐Evolving Performance

2021 ◽  
pp. 2102772
Author(s):  
Hanxiao Liao ◽  
Tao Luo ◽  
Pengfei Tan ◽  
Kejun Chen ◽  
Lili Lu ◽  
...  
Keyword(s):  
Sulfate Ion ◽  
Nickel Iron ◽  
Oxygen Evolving

scholarly journals Role of redox-inactive metals in controlling the redox potential of heterometallic manganese–oxido clusters

2021 ◽  
Author(s):  
Keisuke Saito ◽  
Minesato Nakagawa ◽  
Manoj Mandal ◽  
Hiroshi Ishikita
Keyword(s):  
Photosystem Ii ◽  
Redox Potential ◽  
Quantum Chemical Calculations ◽  
Catalytic Reaction ◽  
Quantum Chemical ◽  
Ionic Radius ◽  
Redox Potentials ◽  
Oxygen Evolving ◽  
Highest Occupied Molecular Orbitals

AbstractPhotosystem II (PSII) contains Ca2+, which is essential to the oxygen-evolving activity of the catalytic Mn4CaO5 complex. Replacement of Ca2+ with other redox-inactive metals results in a loss/decrease of oxygen-evolving activity. To investigate the role of Ca2+ in this catalytic reaction, we investigate artificial Mn3[M]O2 clusters redox-inactive metals  [M] ([M]  = Mg2+, Ca2+, Zn2+, Sr2+, and Y3+), which were synthesized by Tsui et al. (Nat Chem 5:293, 2013). The experimentally measured redox potentials (Em) of these clusters are best described by the energy of their highest occupied molecular orbitals. Quantum chemical calculations showed that the valence of metals predominantly affects Em(MnIII/IV), whereas the ionic radius of metals affects Em(MnIII/IV) only slightly.

Role of Phosphatidylglycerol in Oxygen-Evolving Complex of Photosystem II

2008 ◽  
pp. 463-466 ◽  
Author(s):  
Naoki Mizusawa ◽  
Isamu Sakurai ◽  
Hisako Kubota ◽  
Hajime Wada
Keyword(s):  
Photosystem Ii ◽  
Oxygen Evolving Complex ◽  
Oxygen Evolving

Rational Design Combining Morphology and Charge-Dynamic for Hematite/Nickel–Iron Oxide Thin-Layer Photoanodes: Insights into the Role of the Absorber/Catalyst Junction

2019 ◽  
Vol 11 (51) ◽  
pp. 48002-48012 ◽  
Author(s):  
Michele Orlandi ◽  
Serena Berardi ◽  
Alberto Mazzi ◽  
Stefano Caramori ◽  
Rita Boaretto ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Thin Layer ◽  
Rational Design ◽  
Nickel Iron ◽  
Charge Dynamic

Electron Transport from QA to Thymoquinone in a Synechococcus Oxygen-Evolving Photosystem II Preparation: Role of QB and Binding Affinity of Thymoquinone to the QB Site

1993 ◽  
Vol 48 (3-4) ◽  
pp. 174-178 ◽  
Author(s):  
Kazuhiko Satoh ◽  
Yasuhiro Kashino ◽  
Hiroyuki Koike
Keyword(s):  
Binding Affinity ◽  
Turnover Rate ◽  
Side Chain ◽  
Head Group ◽  
Binding Affinities ◽  
Ps Ii ◽  
Thermophilic Cyanobacteria ◽  
High Concentrations ◽  
Oxygen Evolving

Abstract We have recently shown that binding affinities of benzoquinones can be estimated by two methods in photosystem (PS) II particles (K. Satoh et al., Biochim. Biophys. Acta 1102, 45-52 (1992)). Using these methods we calculated the binding affinity of thymoquinone (2-methyl-5-isopropyl-p-benzoquinone) to the QB site and studied how the quinone accepts electrons in oxygen-evolving PS II particles isolated from the thermophilic cyanobacteria, Synechococcus elongatus and S. vulcanus. The results are as follows: (1) The binding constant of thymoqui­ none to the QB site determined by several methods was around 0.33 mᴍ . (2) At low thymoquinone concentrations the quinone was supposed to accept electrons via QB-plastoquinone, whereas at high concentrations the quinone seemed to bind to the QB site and accept an electron directly from Q-A. Lower rates of photoreduction of the quinone at high concentrations were attributed to a slower turnover rate of the quinone at the QB site than that of endogenous plastoquinone. (3) A model for the function of plastoquinone at the QB site, which can explain all the results, was presented. According to this model, the plastoquinone molecule at the QB site is not replaced by another plastoquinone molecule. Instead, it transfers electrons to pool plastoquinone molecules by turning over its head group but remaining its long side chain bound to the PS II complexes.

The oxygen evolving enzyme: Role of calcium and chloride ions.

1991 ◽  
Vol 43 (2-3) ◽  
pp. 365
Author(s):  
A. Boussac ◽  
P. Sétif ◽  
A.W. Rutherford
Keyword(s):  
Chloride Ions ◽  
Oxygen Evolving

Understanding the role of cerium during VIM refining of nickel-chromium and nickel-iron alloys

1992 ◽  
Vol 21 (1) ◽  
pp. 603-611
Author(s):  
D. Li ◽  
F. Cosandey ◽  
G. E. Maurer ◽  
R. Foote ◽  
J. K. Tien
Keyword(s):  
Iron Alloys ◽  
Nickel Iron ◽  
Nickel Chromium
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