Interfacial photoreactions at the photosynthetic membrane interface: an upper limit for the number of platinum atoms required to form a hydrogen-evolving platinum metal catalyst

Greenbaum, Elias

doi:10.1021/j100327a001

Cited by 55 publications

(53 citation statements)

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“…24,25 In this case the precipitation reaction is in which PS I itself is the source of electrons. PS I-driven hydrogen evolution will not occur from chloroplast membranes unless it is contacted with metallic platinum.…”

Section: Resultsmentioning

confidence: 99%

Measurement of Electrostatic Potentials above Oriented Single Photosynthetic Reaction Centers

Lee

Stubna

et al. 2000

J. Phys. Chem. B

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Photosystem I (PS I) reaction centers are nanometer-size robust supramolecular structures that can be isolated and purified from green plants. Using the technique of Kelvin force probe microscopy, we report here the first measurement of exogenous photovoltages generated from single PS I reaction centers in a heterostructure composed of PS I, organosulfur molecules, and atomically flat gold. Illumination of the reaction centers was achieved with a diode laser at λ ) 670 nm. Data sets consisting of 22 individual PS Is measured entirely under laser illumination, 12 PS Is measured entirely in darkness, and four PS Is in which the light-dark transition occurred in midscan of a single PS I were obtained. The average values of the light minus dark voltages relative to the substrate for the four PS Is were -1.13 ( 0.14 and -1.20 ( 0.19 V at diametrical peripheries and -0.97 ( 0.04 V at the center. Under illumination, the potentials of the central region of the PS Is were typically more positive than the periphery by 6-9 kT, where kT is the Boltzmann energy at room temperature. These energies suggest a possible mechanism whereby negatively charged ferredoxin, the soluble electron carrier from PS I to the Calvin-Benson cycle, is anchored and positioned at the reducing end of PS I for electron transfer. The results are placed in context with the prior experimental literature on the structure of the reducing end of PS I.

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Section: Resultsmentioning

confidence: 99%

Measurement of Electrostatic Potentials above Oriented Single Photosynthetic Reaction Centers

Lee

Stubna

et al. 2000

J. Phys. Chem. B

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“…Hill and Bendall proposed the Z-scheme in 1960 and agreed on PSI as the final reducing site in photosynthetic electron transport [22]. The 'Hill Reaction ' can be followed alternatively using hexachloro palatinate [PtCl 6 ] -2 on thylakoid membranes and isolated PSI [92][93][94]. In a process referred to as photoprecipitation, metallic Pt particles form on the stromal ridge of PSI, shuttling electrons from F B to protons in the immediate vici nity of the catalytic Pt surface [95].…”

Section: Nobel Metal Catalysis With Psi As Photosensitizermentioning

confidence: 99%

10 Photosynthesis and hydrogen metabolism revisited. On the potential of light-driven hydrogen production in vitro

Stripp¹,

Heberle²

2015

Biohydrogen

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“…Colloidal platinum can be directly deposited onto thylakoid membranes and isolated PSI complexes in an approach pioneered by Greenbaum and coworkers [16][17][18]. This ensures that an electron is transferred within the time constraints of the system, which is ~65 ms before the electron on F B recombines with P 700 + .…”

Section: Coating Psi With Platinummentioning

confidence: 99%

11 Re-routing redox chains for directed photocatalysis

Lubner¹,

Applegate²,

Golbeck³

2015

Biohydrogen

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Interfacial photoreactions at the photosynthetic membrane interface: an upper limit for the number of platinum atoms required to form a hydrogen-evolving platinum metal catalyst

Cited by 55 publications

References 0 publications

Measurement of Electrostatic Potentials above Oriented Single Photosynthetic Reaction Centers

Measurement of Electrostatic Potentials above Oriented Single Photosynthetic Reaction Centers

10 Photosynthesis and hydrogen metabolism revisited. On the potential of light-driven hydrogen production in vitro

11 Re-routing redox chains for directed photocatalysis

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