Tuning Hole Accumulation of Metal Oxides Promotes the Oxygen Evolution Rate

ACS Catalysis ◽  
2020 ◽  
Vol 10 (18) ◽  
pp. 10427-10435
Author(s):  
Peikun Zhang ◽  
Wei Wang ◽  
Hui Wang ◽  
Yanbo Li ◽  
Chunhua Cui
Keyword(s):  
Metal Oxides ◽  
Oxygen Evolution ◽  
Evolution Rate ◽  
Oxygen Evolution Rate

Oxygen evolution rate of rice cultivars

2008 ◽  
Vol 46 (1) ◽  
pp. 148-150 ◽  
Author(s):  
M. A. Bacarin ◽  
A. R. Falqueto ◽  
J. L. Coimbra ◽  
A. C. Oliveira ◽  
A. M. De Magalhaes
Keyword(s):  
Oxygen Evolution ◽  
Evolution Rate ◽  
Rice Cultivars ◽  
Oxygen Evolution Rate

scholarly journals Dimensional modelling of the fuel outgassing phenomenon: Improving flammability assessment of aircraft fuel tanks

2011 ◽  
Vol 115 (1172) ◽  
pp. 605-614 ◽  
Author(s):  
A. P. Harris ◽  
N. M. Ratcliffe
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Transfer Rate ◽  
Fuel Tank ◽  
Aviation Fuel ◽  
Evolution Rate ◽  
Time Constants ◽  
Oxygen Evolution Rate ◽  
Aircraft Fuel ◽  
Wide Range ◽  
Fuel Tanks

Abstract Fuel outgassing (oxygen evolution) within aircraft fuel tanks presents a serious flammability hazard. Time constants representing oxygen transfer rate, from the fuel into a tank’s ullage, are used to model the effect of outgassing on tank flammability. These time constants are specific to a single aircraft type and flight envelope and may not accurately represent fuel outgassing behaviour for other aircraft types with differing fuel tank configurations and flight envelopes. To improve current modelling practice for more accurate flammability analysis dimensional modelling has been used to determine the rate of oxygen evolution from Jet A-1 fuel in an aircraft fuel tank. Measurements of oxygen evolution rate, made on a dimensionally similar model, have been projected to an A320 aircraft. The evolution of oxygen from the fuel was found to increase monotonically with time. Fitting the test data with an inverse-exponential function enabled oxygen release rate and its associated time constant (τ) to be determined. Dimensional modelling of aviation fuel outgassing using model fuel tanks will enable oxygen evolution rate from aviation fuel to be determined for a wide range of aircraft fuel tank configurations and environments without the need for flight testing. In turn the accuracy of flammability assessment of aircraft fuel tanks will be improved and significant cost savings made.

Oxygen evolution rate in Antarctic filamentous alga Stigeoclonium sp. evaluated by optodes relates to chlorophyll fluorescence parameters (Short Communication)

2018 ◽  
Vol 8 (1) ◽  
pp. 143-150
Author(s):  
Peter Váczi
Keyword(s):  
Chlorophyll Fluorescence ◽  
Linear Relationship ◽  
Oxygen Evolution ◽  
Photosynthetically Active Radiation ◽  
Filamentous Alga ◽  
Evolution Rate ◽  
O2 Evolution ◽  
Effective Quantum Yield ◽  
Active Radiation ◽  
Oxygen Evolution Rate

Photosynthetic reactions of algal communities, the essential component of primary production in polar regions, are strongly dependent on environmental factors. Among them, availability and amount of light in particular parts of growing season are of major importance. In this paper, the response of the photosynthetic processes of a filamentous fresh-water alga to photosynthetically active radiation (PAR) was studied by two approaches. The simultaneous measurements of the effective quantum yield (FPSII) and oxygen evolution rate (OER) at stepwise increasing photosynthetically active radiation provided data for beneficial correlation analysis of the FPSII to OER relationship in a wide range of PAR. In this study, the culture of filamentous alga Stigeoclonium sp. was analyzed. The linear relationship between FPSII and OER was found for the low PAR (the range of 0 – 200 mmol.m-2.s-1). At high PAR levels (200 – 1000 mmol.m-2.s-1) another linear relationship with different slope was found. The approach combining the fluorometric and oxymetric method might be used for calibration of data in follow up studies and, consequently for evaluation of photosynthetic rates (O2 evolution) from chlorophyll fluorescence data.

Allelopathic Inhibitory Effects of the Dried Macroalga Ulva pertusa on the Photosynthetic Activities of Red Tide-Causing Microalga Skeletonema costatum

2013 ◽  
Vol 726-731 ◽  
pp. 29-34 ◽  
Author(s):  
Chang Peng Ye ◽  
Meng Cheng Zhang
Keyword(s):  
Oxygen Evolution ◽  
Dark Respiration ◽  
Skeletonema Costatum ◽  
Ulva Pertusa ◽  
Evolution Rate ◽  
High Time Resolution ◽  
Oxygen Evolving Complex ◽  
Photosynthetic Oxygen Evolution ◽  
Jip Test ◽  
Oxygen Evolution Rate

Allelopathic effects of dried macroalgaUlva pertusa(Chlorophyta) on photosynthesis of the microalgaeSkeletonema costatum(Bacillariophyta) were evaluated using coexistence culture systems.S. costatumwas cultured with different biomass of driedU. pertusaunder controlled laboratory conditions for three days. The chlorophylla(Chla) fluorescence transient O-J-I-P curve coupled with its specific parameters inS. costatumwas established. The oxygen evolution rate was measured, the Chlafluorescence transients were recorded in vivo at high time resolution and analyzed according to the JIP-test which can quantify photosystem II activity. A clear dose-dependent relationships were observed between the dried biomass ofU. pertusaand its inhibitory effect onS. costatum.The rate of light-saturated maximum photosynthetic oxygen evolution (Pmax) was markedly decreased by different biomass of driedU. pertusa, while dark respiration rate (Rd) was increased. A decrease in the O-J-I-P curve expressed as Chlafluorescence intensity along with its specific parameters were observed, which was also time-dependent. The main photosynthetic inhibitory targets of the macroalga on the microalga, according to oxygen evolution rate and the JIP-test, can be expressed as, the damage to the oxygen-evolving complex, a decrease in the number of active reaction centers and the blocking of the electron transport chain. The results of the present study suggest that dried fragments ofU. pertusaeffectively inhibit photosynthesis inS. costatum.

Hollow cuboidal MnCo2O4coupled with nickel phosphate: A promising oxygen evolution reaction electrocatalyst

2021 ◽  
Author(s):  
ADIT KUMAR SHAH ◽  
Sourav Bhowmick ◽  
Devipriya Gogoi ◽  
Nageswara Rao Peela ◽  
Mohammad Qureshi
Keyword(s):  
Metal Oxides ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Complex Metal ◽  
Nickel Phosphate ◽  
Complex Metal Oxides

The growth of hierarchical morphologies of complex metal oxides directly onto the substrate is a challenging task. Here in we report, unique hollow-cuboidal MnCo2O4 (h-MCO) morphology that offers insights into...

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