Photo-Current Enhancement at Cu/p-Cu2O/rGO- Electrolyte Interface

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
S.P.A.U.K. Samarakoon ◽  
C.A.N. Fernando
Keyword(s):  
Diffuse Reflectance ◽  
Electrochemical Cell ◽  
Time Development ◽  
Charge Carriers ◽  
Electrochemical Cells ◽  
Current Action ◽  
Electrolyte Interface ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
Photo Current

A considerable photo-current enhancement was found at the Cu/p-Cu2O/rGO-electrolyte interface in a photo-electrochemical cell with compared to that of Cu/p-Cu2O-electrolyte interface. The reason for the photo-current enhancement may be due to the efficient charge separation process provided at Cu/p-Cu2O/rGO-electrolyte interface. Here rGO (reduced graphene oxide) acts as an electron acceptor for the photo-generated charge carriers as it readily accept electrons from the conduction band of p-Cu2O. rGO was synthesized using electro-phoretic deposition (EPD) technique. Fabricated samples were characterized using diffuse reflectance spectra, photo-current action spectra and the time development of the photocurrent of photo-electrochemical cells.

Photo-Current Enhancement in the Cu/rGO/n-Cu2O Photo-Electrode at Electrolyte Interface

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
S.P.A.U.K. Samarakoon ◽  
K.A.S.K. Hemachandra ◽  
C.A.N. Fernando
Keyword(s):  
Charge Separation ◽  
Separation Process ◽  
Charge Carriers ◽  
Copper Sheet ◽  
Simple Method ◽  
Electrolyte Interface ◽  
Reduced Graphene ◽  
Photo Electrode ◽  
First Time ◽  
Photo Current

A simple method was found to fabricate Cu/rGO/n-Cu2O photo-electrode to enhance the photocurrent with compared to the device Cu/n-Cu2O photo-electrode at semiconductor-electrolyte interface. Reduced graphene oxide (rGO) was fabricated on a well cleaned copper sheet using electro-phoretic deposition (EPD) technique to fabricate Cu/rGO. Thereafter Cu/rGO electrode was boiled in a 10-4M CuSO4 solution to fabricate Cu/rGO/n-Cu2O photo-electrode for the first time. Here The rGO acts as a good electron acceptor ton-Cu2O photo-generated electrons enhancing the charge separation process suppressing the recombination process of the photo-generated charge carriers.

Simple light-emitting electrochemical cell using reduced graphene oxide and a ruthenium (II) complex

2017 ◽  
Vol 56 (23) ◽  
pp. 6476 ◽  
Author(s):  
Harry Anderson Rivera Tito ◽  
Johannes Zimmermann ◽  
Nils Jürgensen ◽  
Gerardo Hernández Sosa ◽  
María Esther Quintana Caceda
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Cell ◽  
Light Emitting ◽  
Reduced Graphene

scholarly journals An efficient heterodinuclear Ir(iii)/Pt(ii) complex: synthesis, photophysics and application in light-emitting electrochemical cells

2019 ◽  
Vol 7 (34) ◽  
pp. 10672-10682 ◽  
Author(s):  
Marsel Z. Shafikov ◽  
Shi Tang ◽  
Christian Larsen ◽  
Michael Bodensteiner ◽  
Valery N. Kozhevnikov ◽  
...  
Keyword(s):  
High Efficiency ◽  
Electrochemical Cell ◽  
Electrochemical Cells ◽  
Light Emitting

A novel heterodinuclear Ir(iii)/Pt(ii) complex delivers vibrant red phosphorescence with high efficiency in a light-emitting electrochemical cell.

One-Step Hydrothermal Synthesis of CoNi2S4 for Hybrid Supercapacitor Electrodes

NANO ◽  
2019 ◽  
Vol 14 (07) ◽  
pp. 1950088 ◽  
Author(s):  
Peng Liu ◽  
Yanwei Sui ◽  
Fuxiang Wei ◽  
Jiqiu Qi ◽  
Qingkun Meng ◽  
...  
Keyword(s):  
Electrode System ◽  
Hybrid Supercapacitor ◽  
Microstructural Study ◽  
Specific Energy Density ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
Spherical Core ◽  
One Step ◽  
High Specific Energy ◽  
Cycling Life

In this study, a simple one-step hydrothermal method was developed to prepare a novel hierarchical CoNi2S4 nanostructure similar to rambutan fruit. The surface microstructural study clearly visualized that the rambutan-like CoNi2S4 consists of nanorods grown directly on the surface of spherical core structures. The close attachment of the nanorods to the spheres increased the active areas of the electrode, which facilitates efficient charge transport from the nanorods to the spherical core structure. CoNi2S4 with a rambutan-like hierarchical structure showed an excellent specific capacitance of 944[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], considerable rate capacitance (75.6% retention at 10[Formula: see text]A[Formula: see text]g[Formula: see text]) and excellent cycling life (91.1% retention after 5000 circulations) in the three-electrode system. Besides, the assembled hybrid supercapacitor based on CoNi2S4 and reduced graphene oxide exhibited a high specific energy density of 23.58[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at the power density of 800[Formula: see text]W[Formula: see text]kg[Formula: see text].

scholarly journals Hydrothermal Synthesis of rGO/PbTiO3 Photocatalyst and Its Photocatalytic H2 Evolution Activity

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Chunyan Wang ◽  
Lianwei Shan ◽  
Dongyuan Song ◽  
Yanwei Xiao ◽  
Jagadeesh Suriyaprakash
Keyword(s):  
Photocatalytic Performance ◽  
H2 Evolution ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
One Step ◽  
Photocatalytic H2 Evolution

In this letter, we investigated the photocatalytic activity of the newly formed rGO/PbTiO3 composites, which are synthesized by a one-step hydrothermal route. By adjusting the amount of reduced graphene oxide (rGO) (0, 0.15, 0.30, 0.60, and 1.20 wt%) with the PbTiO3, we constructed various photocatalysts for this investigation. The crystal structure and morphology of the various composites were studied by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Photoelectron spectroscopic study revealed that the band structure of the newly formed composites and efficient charge separation can be obtained by the interfaces of various rGO content. In addition, the photocatalytic performance of the synthesized composites was explored by H2 evolution and rhodamine blue (RhB) degradation. The obtained results indicated that the addition of the appropriate amount of rGO could improve the activity of pure PbTiO3, significantly.

scholarly journals Versatile electrochemical cell for Li/Na-ion batteries and high-throughput setup for combinedoperandoX-ray diffraction and absorption spectroscopy

2016 ◽  
Vol 49 (6) ◽  
pp. 1972-1981 ◽  
Author(s):  
Jonas Sottmann ◽  
Roberto Homs-Regojo ◽  
David S. Wragg ◽  
Helmer Fjellvåg ◽  
Serena Margadonna ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Electrochemical Cell ◽  
High Capacity ◽  
Electrochemical Cells ◽  
X Ray Diffraction ◽  
Composition Profiles ◽  
Multi Phase ◽  
Insight Into ◽  
Aqueous Batteries

A fundamental understanding of de/intercalation processes (single phaseversusmulti-phase), structural stability and voltage–composition profiles is pivotal for optimization of electrode materials for rechargeable non-aqueous batteries. A fully operational setup (electrochemical cells, sample changer and interfacing software) that enables combined quasi-simultaneousoperandoX-ray diffraction (XRD) and absorption (XANES and EXAFS) measurements coupled with electrochemical characterization is presented. Combined XRD, XANES and EXAFS analysis provides a deep insight into the working mechanisms of electrode materials, as shown for the high-voltage Li insertion cathode material LiMn1.5Ni0.5O4and the high-capacity sodium conversion anode material Bi2S3. It is also demonstrated that the cell design can be used for in-house XRD characterization. Long-term cycling experiments on both Li and Na electrode materials prove the hermeticity and chemical stability of the design as a versatileoperandoelectrochemical cell.

scholarly journals In situ investigation of dissociation and migration phenomena at the Pt/electrolyte interface of an electrochemical cell

2015 ◽  
Vol 6 (10) ◽  
pp. 5635-5642 ◽  
Author(s):  
Yeuk Ting Law ◽  
Spyridon Zafeiratos ◽  
Stylianos G. Neophytides ◽  
Alin Orfanidi ◽  
Dominique Costa ◽  
...  
Keyword(s):  
Double Layer ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Cell ◽  
Ambient Pressure ◽  
Liquid Electrolyte ◽  
X Ray ◽  
Electrolyte Interface ◽  
In Situ Investigation ◽  
And Migration

Using near ambient pressure X-ray photoelectron spectroscopy we probe in situ the double layer at the Pt/liquid electrolyte interface.

scholarly journals ITO-free Perovskite Light-Emitting Electrochemical Cell

2021 ◽  
Vol 2015 (1) ◽  
pp. 012010
Author(s):  
M Baeva ◽  
D Gets ◽  
E Bodyago ◽  
A Mozharov ◽  
V Neplokh ◽  
...  
Keyword(s):  
Electrochemical Cell ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Electrochemical Cells ◽  
Semiconductor Technology ◽  
Promising Alternative ◽  
Light Emitting ◽  
Conventional Technology ◽  
Halide Perovskites ◽  
Important Branch

Abstract Since Complementary metal–oxide–semiconductor technology is the conventional technology for micro- and optoelectronics, integration of emerging materials, such as halide perovskites, into the process is an important branch of perovskite technologies development. In this regard ITO free device research becomes increasingly important. The Perovskite Light-Emitting electrochemical cells are a promising alternative to conventional Perovskite Light Emitting Diodes. In this work we demonstrate green (λEL = 523 nm) CsPbBr3 Perovskite Light-Emitting electrochemical cells with luminescence intensity of 50 kd/m2 integrated with Si++(111) substrate.

scholarly journals Photoelectrochemical Degradation of Organic Pollutants on a La3+ Doped BiFeO3 Perovskite

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1069
Author(s):  
Oluchi V. Nkwachukwu ◽  
Charles Muzenda ◽  
Babatope O. Ojo ◽  
Busisiwe N. Zwane ◽  
Babatunde A. Koiki ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Diffuse Reflectance ◽  
Electrochemical Impedance ◽  
Bismuth Ferrite ◽  
Charge Carriers ◽  
Current Response ◽  
Orange Ii ◽  
Applied Bias ◽  
Bias Potential ◽  
Light Region

Towards nonconventional wastewater treatment methods for the degradation of organic pollutants in wastewater, a perovskite-based photoelectrochemical system was developed. Bismuth ferrite doped with lanthanum (La-BiFeO3, La-BFO) perovskite was synthesised through a hydrothermal method with low calcination temperature for the photoelectrochemical degradation of orange II dye and other cocktails of dyes. Photoanodes were prepared by the deposition of the perovskites on a fluorine-doped tin oxide (FTO) substrate. The photoanodes were characterised using XRD, FESEM, FTIR and UV-vis diffuse reflectance. The photoelectrochemical properties of the synthesised photoanodes were investigated with chronoamperometry and electrochemical impedance spectroscopy (including Mott–Schottky analysis). The results show that all La3+-doped BFO photoanodes exhibited a higher absorption edge in the visible light region than the undoped BFO. The photocurrent response of 10% La-BFO (the best performing electrode) exhibited a three times higher current response than the pure BFO. In addition, the electrode exhibited a good degradation efficiency of 84.2% within 120 min with applied bias potential of 2 V at a pH of 7. EIS studies showed a significant enhancement of the interfacial electron transfer of the charge carriers. The enhancements in electrode performances were attributed to the synergistic effect of the applied bias potential and the introduction of La3+ into the BFO matrix. This study therefore shows that the photoelectrocatalytic performance of BFO for water treatment can be improved by the introduction of perovskites-doping ions such as La3+.

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