scholarly journals Photocatalytic water oxidation by persulphate with a Ca2+ ion-incorporated polymeric cobalt cyanide complex affording O2 with 200% quantum efficiency

2017 ◽  
Vol 53 (24) ◽  
pp. 3418-3421 ◽  
Author(s):  
Yusuke Yamada ◽  
Kohei Oyama ◽  
Tomoyoshi Suenobu ◽  
Shunichi Fukuzumi
Keyword(s):  
Quantum Efficiency ◽  
Water Oxidation ◽  
Cyanide Complex ◽  
Maximum Quantum Efficiency

Incorporation of a small amount of Ca2+ ions into a polymeric cobalt cyanide complex enhanced the activity for photocatalytic water oxidation by persulphate with [Ru(bpy)3]2+ at pH 7.0 to achieve a maximum quantum efficiency of 200%.

scholarly journals On the Minimum Quantum Requirement of Photosynthesis

2009 ◽  
Vol 64 (9-10) ◽  
pp. 673-679 ◽  
Author(s):  
Yuzeir Zeinalov
Keyword(s):  
Light Intensity ◽  
Oxygen Evolution ◽  
Quantum Efficiency ◽  
Optical Density ◽  
Dark Respiration ◽  
Linear Part ◽  
Light Curves ◽  
Quantum Requirement ◽  
Light Intensities ◽  
Maximum Quantum Efficiency

An analysis of the shape of photosynthetic light curves is presented and the existence of the initial non-linear part is shown as a consequence of the operation of the non-cooperative (Kok’s) mechanism of oxygen evolution or the effect of dark respiration. The effect of nonlinearity on the quantum efficiency (yield) and quantum requirement is reconsidered. The essential conclusions are: 1) The non-linearity of the light curves cannot be compensated using suspensions of algae or chloroplasts with high (>1.0) optical density or absorbance. 2) The values of the maxima of the quantum efficiency curves or the values of the minima of the quantum requirement curves cannot be used for estimation of the exact value of the maximum quantum efficiency and the minimum quantum requirement. The estimation of the maximum quantum efficiency or the minimum quantum requirement should be performed only after extrapolation of the linear part at higher light intensities of the quantum requirement curves to “0” light intensity

High Quantum Efficiency Achieved on BiVO 4 Photoanode for Efficient Solar Water Oxidation

Solar RRL ◽  
2019 ◽  
Vol 3 (12) ◽  
pp. 1900301 ◽  
Author(s):  
Qi Qin ◽  
Qian Cai ◽  
Jing Li ◽  
Chuanyong Jian ◽  
Wenting Hong ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Water Oxidation ◽  
High Quantum Efficiency ◽  
Solar Water ◽  
High Quantum ◽  
Solar Water Oxidation

scholarly journals 317 Photosynthetic Characteristics of Two Cycas micronesica Leaf Cohorts

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 497D-497
Author(s):  
Thomas E. Marler
Keyword(s):  
Gas Exchange ◽  
Quantum Efficiency ◽  
Photosynthetic Capacity ◽  
Sun Exposure ◽  
Photosynthetic Characteristics ◽  
Daily Maximum ◽  
Ambient Light ◽  
Apparent Quantum Yield ◽  
Psii Photochemistry ◽  
Maximum Quantum Efficiency

Cycas micronesica is an arborescent cycad with sclerophyllous, long-lived compound leaves that are produced in synchronized pulses. The photosynthetic characteristics of leaves in two sequential cohorts of ≈2 and ≈11 months after leaf expansion were determined in this study. Fluorescence yield following 30-min of light exclusion or from leaves engaged in photosynthesis under ambient light was measured throughout several 24-h periods to determine maximum quantum efficiency of PSII photochemistry and quantum efficiency under ambient light. Maximum quantum efficiency was similar for the two cohorts throughout the nocturnal period. Maximum quantum efficiency and quantum efficiency under ambient light declined following exposure to daily direct sun but recovered quickly each afternoon. This daily decline was greater for the older cohort than the younger cohort. Net carbon dioxide assimilation (Pn) was also determined using gas exchange, and light saturated Pn of the older cohort was 75% to 85% of that for the younger cohort during the daily maximum at late morning. Pn of the older cohort increased more slowly in the morning and declined more rapidly in the afternoon than did Pn of the younger cohort. Apparent quantum yield determined by gas exchange was similar for the two cohorts in the absence of extended sun exposure. However, this characteristic declined during midday, and the decline was greater for the older cohort. These results indicate that photosynthetic capacity of older C. micronesica leaf cohorts remains high, and these older leaves may substantially contribute to the plant's overall carbon economy. However, the number of hours during the day in which these older leaves reach their photosynthetic capacity is less than for the younger leaves.

Enhanced photocatalytic activity of BiVO4 coupled with iron-based complexes for water oxidation under visible light irradiation

2019 ◽  
Vol 55 (17) ◽  
pp. 2529-2532 ◽  
Author(s):  
Xiangming Liang ◽  
Junqi Lin ◽  
Xiaohu Cao ◽  
Wanjun Sun ◽  
Junyi Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Quantum Efficiency ◽  
Visible Light Irradiation ◽  
Water Oxidation ◽  
High Oxygen ◽  
Light Irradiation ◽  
Apparent Quantum Efficiency ◽  
Iron Based ◽  
Oxygen Yield

Four iron complexes were used as pre-catalysts in BiVO4–NaIO3 photocatalytic water oxidation systems. The best-performing system afforded a rather high oxygen yield and apparent quantum efficiency yield of 99.1% and 44.3%, respectively.

Sky-blue iridium complexes with pyrimidine ligands for highly efficient phosphorescent organic light-emitting diodes

2020 ◽  
Vol 44 (21) ◽  
pp. 8743-8750
Author(s):  
Haiyang Ma ◽  
Di Liu ◽  
Jiuyan Li ◽  
Yongqiang Mei ◽  
Deli Li ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complexes ◽  
Light Emitting ◽  
Highly Efficient ◽  
Organic Light ◽  
Cie Coordinates ◽  
Maximum Quantum Efficiency

Three sky blue heteroleptic Ir(III) complexes with emission peaks at 457–459 nm, have been developed. A maximum quantum efficiency of 21.23% with CIE coordinates of (0.15, 0.26) is realized in their PhOLEDs, representing a higher efficiencies and improved color purities than FIrpic.

Photoinduced water oxidation by polymeric iron cyanide complex

1998 ◽  
Vol 131 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Toshiyuki Abe ◽  
Hidenobu Shiroishi ◽  
Kosato Kinoshita ◽  
Masao Kaneko
Keyword(s):  
Water Oxidation ◽  
Cyanide Complex ◽  
Iron Cyanide

InPZnS alloy quantum dots with tris(hexylthio)phosphine as a dual anionic precursor

Nanoscale ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 3014-3019 ◽  
Author(s):  
Soyeon An ◽  
Hyelim Cho ◽  
Heung Bae Jeon ◽  
Sang-Wook Kim
Keyword(s):  
Quantum Dots ◽  
Quantum Efficiency ◽  
Emission Wavelength ◽  
Alloy Quantum Dots ◽  
Maximum Quantum Efficiency

New anionic precursor, tris(hexylthio)phosphine(THTP), is introduced for use with InP-based QDs, as a result, the emission wavelength from 530 nm to 570 nm and a maximum quantum efficiency of 42% are obtained.

scholarly journals Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

2016 ◽  
Vol 20 (5) ◽  
pp. 434-440 ◽  
Author(s):  
Jônatas R. M. de Sousa ◽  
Hans R. Gheyi ◽  
Marcos E. B. Brito ◽  
Claudivan F. de Lacerda ◽  
Francisco V. da Silva ◽  
...  
Keyword(s):  
Salt Stress ◽  
Photosystem Ii ◽  
Quantum Efficiency ◽  
Saline Water ◽  
Block Design ◽  
Fruit Production ◽  
N Fertilization ◽  
Yield Potential ◽  
Rangpur Lime ◽  
Maximum Quantum Efficiency

ABSTRACT This study aimed to evaluate the salt tolerance of 'Mimo do Céu' orange grafted onto three rootstocks using physiological parameters such as maximum quantum efficiency of photosystem II (PSII) and the production of fruits. It also evaluated the effectiveness of increased nitrogen (N) fertilization in reducing the effects of salt stress. Two concomitant experiments were carried out under controlled conditions, using drainage lysimeters. The Experiment I evaluated the effects of the application of five levels of saline water on three combinations of scion-rootstocks grafted with 'Mimo de Ceu' orange, in a randomized block design with three replicates in a 5 x 3 factorial scheme. The Experiment II evaluated the application of two N levels (100 and 200% of recommendation) in three scion-rootstock combinations irrigated with water of electrical conductivity of 3.0 dS m-1, in a 3 x 2 factorial scheme, with three replicates. The maximum quantum efficiency of PSII was inhibited in citrus plants under salt stress. 'Mimo do Ceu' orange grafted onto 'Common' Rangpur lime has higher yield potential. The increase in N dose did not reduce the deleterious effects of water salinity on fruit production.

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