A highly stable and scalable photosynthetic reaction center–graphene hybrid electrode system for biomimetic solar energy transduction

2017 ◽  
Vol 5 (13) ◽  
pp. 6038-6041 ◽  
Author(s):  
Haojie Zhang ◽  
Anne-Marie Carey ◽  
Ki-Wan Jeon ◽  
Minghui Liu ◽  
Travis D. Murrell ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Solar Energy ◽  
Reduced Graphene Oxide ◽  
Reaction Center ◽  
Photosynthetic Reaction Center ◽  
Electrode System ◽  
Energy Transduction ◽  
Oxide System ◽  
Reduced Graphene

A highly stable and scalable photosynthetic reaction center–mercapto reduced graphene oxide system has been developed for solar energy transduction.

Chitosan/reduced graphene oxide-modified spacer fabric as a salt-resistant solar absorber for efficient solar steam generation

2019 ◽  
Vol 7 (31) ◽  
pp. 18311-18317 ◽  
Author(s):  
Fei Wang ◽  
Dongyuan Wei ◽  
Yuanzhen Li ◽  
Tao Chen ◽  
Peng Mu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Solar Energy ◽  
Reduced Graphene Oxide ◽  
Fresh Water ◽  
Light Irradiation ◽  
Steam Generation ◽  
Solar Absorber ◽  
Spacer Fabric ◽  
Reduced Graphene ◽  
Solar Steam Generation

Solar steam generation by direct harvesting of light irradiation has emerged as one of most efficient technologies for utilization of solar energy and production of fresh water.

Photoactive film by covalent immobilization of a bacterial photosynthetic protein on reduced graphene oxide surface

2015 ◽  
Vol 1717 ◽  
Author(s):  
Rocco Roberto Tangorra ◽  
Alessandra Antonucci ◽  
Francesco Milano ◽  
Alessandra Operamolla ◽  
Francesca Italiano ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Structural Integrity ◽  
Flash Photolysis ◽  
Electronic Devices ◽  
Photosynthetic Reaction Center ◽  
Covalent Immobilization ◽  
Oxide Surface ◽  
Covalent Functionalization ◽  
Reduced Graphene

ABSTRACTCovalent functionalization of reduced graphene oxide (rGO) with the photosynthetic reaction center (RC) from Rhodobacter sphaeroides R26 via click chemistry reaction has been performed. The hybrid system was characterized by flash photolysis and infrared spectroscopy and the RC was found to retain its photoactivity and structural integrity. The strategy is applicable for the fabrication of hybrid bio-electronic devices capable of absorbing and converting solar energy.

scholarly journals Paper-Based Electrochemical Biosensors for Voltammetric Detection of miRNA Biomarkers Using Reduced Graphene Oxide or MoS2 Nanosheets Decorated with Gold Nanoparticle Electrodes

Biosensors ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 236
Author(s):  
Hilal Torul ◽  
Ece Yarali ◽  
Ece Eksin ◽  
Abhijit Ganguly ◽  
John Benson ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Gold Nanoparticle ◽  
Reduced Graphene Oxide ◽  
Differential Pulse ◽  
Electrode System ◽  
Sensitive Detection ◽  
Reduced Graphene ◽  
Voltammetric Detection ◽  
Wax Printing ◽  
Cost Efficient

Paper-based biosensors are considered simple and cost-efficient sensing platforms for analytical tests and diagnostics. Here, a paper-based electrochemical biosensor was developed for the rapid and sensitive detection of microRNAs (miRNA-155 and miRNA-21) related to early diagnosis of lung cancer. Hydrophobic barriers to creating electrode areas were manufactured by wax printing, whereas a three-electrode system was fabricated by a simple stencil approach. A carbon-based working electrode was modified using either reduced graphene oxide or molybdenum disulfide nanosheets modified with gold nanoparticle (AuNPs/RGO, AuNPs/MoS2) hybrid structures. The resulting paper-based biosensors offered sensitive detection of miRNA-155 and miRNA-21 by differential pulse voltammetry (DPV) in only 5.0 µL sample. The duration in our assay from the point of electrode modification to the final detection of miRNA was completed within only 35 min. The detection limits for miRNA-21 and miRNA-155 were found to be 12.0 and 25.7 nM for AuNPs/RGO and 51.6 and 59.6 nM for AuNPs/MoS2 sensors in the case of perfectly matched probe-target hybrids. These biosensors were found to be selective enough to distinguish the target miRNA in the presence of single-base mismatch miRNA or noncomplementary miRNA sequences.

scholarly journals Hybrid Effect of TiO2/Reduced Graphene Oxide Based Composite for Photo-Catalytic Water Splitting and Strain Sensing

2018 ◽  
Vol 778 ◽  
pp. 144-150 ◽  
Author(s):  
Syed Munir Azeem ◽  
Muahammad Talha Saleem ◽  
Muhammad Faizan ◽  
Sharjeel Ahmed ◽  
Isna Masood
Keyword(s):  
Graphene Oxide ◽  
Solar Energy ◽  
Reduced Graphene Oxide ◽  
Water Splitting ◽  
Sodium Dodecyl ◽  
Synergetic Effect ◽  
Solar Spectrum ◽  
Gauge Factor ◽  
Strain Sensing ◽  
Reduced Graphene

Solar Energy is an everlasting source of energy with minimal carbon footprint. However, due to lack of reliability and consistency it needs to be converted into more reliable and effective means that can be used to provide energy on demand. Hydrogen is a promising carrier and is thus an efficient mean of energy to be converted in, stored and transported. A more direct approach towards harnessing Solar Energy is by photo-aided generation of hydrogen via splitting of water using photolysis. Photocatalytic water splitting is therefore a promising method for future energy security. On the other hand strain sensing is a useful technique to measure medium range loads in trusses or tension rods & can easily replace the existing fragile & expensive semiconductor based sensors. This was done by using a composite of TiO2 /Reduced Graphene Oxide (RGO); TiO2 (anatase) was synthesized via sol-gel process and the main precursor was titanium tetrapropoxide (Ttip). Titania (anatase) characterized by XRD and photo spectrometry while Graphene oxide was synthesized via modified Hummer’s Method. The obtained Reduce Graphene Oxide was dispersed using Sodium Dodecyl Benzene (SDB) and Hydrazine Hydrate. A drastic synergetic effect was found by simply mixing RGO with TiO2 Solution. This not only broadened the photoactivity spectrum of TiO2 from UV region to the more available visible light radiation but also exhibit strain sensing properties and considerable tunable gauge factor. The photocatalytic effect of our composite was tested by coating it over Polycarbonate & then analyzing emitted gas bubbles in a UV radiation chamber while strain sensing was done by coating it on an elastic substrate & applying loads against values of resistance which were measured. This study will also include the reduction of recombination and band gap of TiO2 in order to synchronize it with the available Solar Spectrum thus maximizing solar-to-hydrogen efficiency.

A multifunctional Ni-doped iron pyrite/reduced graphene oxide composite as an efficient counter electrode for DSSCs and as a non-enzymatic hydrogen peroxide electrochemical sensor

2020 ◽  
Vol 49 (25) ◽  
pp. 8516-8527 ◽  
Author(s):  
Sanath Kumar ◽  
Chih-Hung Tsai ◽  
Yen-Pei Fu
Keyword(s):  
Hydrogen Peroxide ◽  
Graphene Oxide ◽  
Solar Energy ◽  
Electrochemical Sensor ◽  
Reduced Graphene Oxide ◽  
Counter Electrode ◽  
Iron Pyrite ◽  
Sensor Applications ◽  
Dual Functional ◽  
Reduced Graphene

Facilely synthesized a dual-functional hybrid of nickel-doped FeS2/rGO for solar energy conversion as an efficient counter electrode and a non-enzymatic H2O2 sensor applications.

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