Suping Yang

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Organization: Huaqiao University

Department: College of Chemical Engineering

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TOPICS

Material Chemistry

Dye Sensitized Solar Cell Dye Sensitized Solar Cells

Organic Chemistry

Dye Sensitized Solar Cell Dye Sensitized Solar Cells

Chemicals
References

What Caused the Formation of the Absorption Maximum at 421nm in vivo Spectra of Rhodopseudomonas palustris

Co-reporter:Chungui Zhao;Huiying Yue;Qianru Cheng;Shicheng Chen

Photochemistry and Photobiology 2014 Volume 90( Issue 6) pp:1287-1292

Publication Date(Web):

DOI:10.1111/php.12334

Abstract

A spectral peak at ~421 nm appeared in vivo spectrum of Rhodopseudomonas palustris CQV97 cultured in acetate–glutamate medium (M1) but not in acetate–ammonium sulfate medium (M2). However, the spectral origin of 421 nm peak was not clear and frequently attributed to carotenoid component(s). In this study, comparative analysis of the extracted components showed that magnesium protoporphyrin IX monomethylester (MPE) was accumulated as one of the predominate components in M1 culture. The amounts of bacteriochlorophyll a in M1 culture were higher than that in M2, whereas the amounts of carotenoids were nearly identical in both cultures. A simple, rapid and minimum interference with carotenoid and bacteriochlorophyll method to efficiently extract the compounds involving in the formation of 421 nm peak was developed in this study. Assembly of purified MPE with protein components from R. palustris in vitro demonstrated that MPE caused the formation of 421 nm peak. The localization analysis in vivo demonstrated it is MPE associating to protein components and accounting for the peak at ~421 nm. This work clarified the 421 nm peak in vivo mainly originated from MPE accumulation, and will be very helpful to further explore the physiological roles of MPE or its derivatives in photosynthesis.

The photoelectric performance of dye-sensitized solar cells fabricated by assembling pigment–protein complexes of purple bacteria on nanocrystalline photoelectrode

Co-reporter:Qiaoming Fu, Chungui Zhao, Suping Yang, Jihuai Wu

Materials Letters 2014 Volume 129() pp:195-197

Publication Date(Web):15 August 2014

DOI:10.1016/j.matlet.2014.05.054

•The visible–NIR responsive DSSC were fabricated based on purple bacterial PPCs.•LH2 assembled on TiO2 film maintained optical electrical properties.•Electron-transfer could be demonstrated from LH2 to TiO2 film.•The photoelectric performance of PPC-based DSSC was higher than that of LHC to date.•This work provides valuable information for constructing NIR-responsive solar cells.Four pigment–protein complexes (PPCs, two types of LH2, LH4 and RC) with near-infrared absorbance were obtained from two typical purple bacteria, and were used to fabricate the visible-NIR responsive DSSC by assembling them on TiO2 film photoanodes. The saturation adsorption quantity of LH2 on TiO2 film was 0.146 μg BChl cm−2 in 72 h. The short current (Isc) and photoelectric conversion efficiency (η) of DSSC with LH2 sensitized-TiO2 reached 1.46 mA cm−2 and 0.49% at the optimal concentration of 46.8 μg BChl ml−1 LH2, respectively, which are approximately two folds higher than those of LHC-based DSSC to date. The RC-sensitized DSSC reached 1.24 mA cm−2 (Isc) and 0.57% (η), which are over three orders of magnitude higher than any other RC-based photovoltaic cells so far. Moreover, the photocurrent response remained stable after several cycles of alternating light and darkness. The results suggested that PPCs could be promising natural sensitizer candidates for fabricating visible–NIR responsive DSSC. And this study provided a new strategy for developing versatile biomimetic energy convertors or photoelectric sensors.

Draft genome sequence of an agar-degrading marine bacterium Flammeovirga pacifica WPAGA1

Co-reporter:Zhuhua Chan, Runping Wang, Shenglong Liu, Chungui Zhao, Suping Yang, Runying Zeng

Marine Genomics (April 2015) Volume 20() pp:23-24

Publication Date(Web):1 April 2015

DOI:10.1016/j.margen.2014.12.001

Flammeovirga pacifica WPAGA1T, which was isolated from sediment of the west Pacific Ocean in 2009 has the ability to produce agar-oligosaccharides from Gracilaria lemaneiformis directly by enzyme-degradation. The draft genome sequence of this strain was sequenced and annotated. Its draft genome contained 6,507,364 bp with a G + C content of 33.8%. Genome sequence information provided a basis for analyzing the digestion of G. lemaneiformis.