Facile Fabrication of Double-Layered Electrodes for a Self-Powered Energy Conversion and Storage System

An aluminum double-layered electrode (DE-Al) was successfully employed as two electrodes in a symmetrical supercapacitor (double-layered electrode symmetric SC (DE-SC)) and as a positive layer of a triboelectric nanogenerator (DE-TENG) with the aim of energy conversion and storage using a selfsame structured, self-powered flexible device. A facile water-assisted oxidation (WAO) process and metal sputtering after the WAO process can allow the electrodes to greatly improve the active surface area and the conductivity, leading to the enhancement of the electrochemical performances of a supercapacitor (SC). Particularly, this double-layered structure fabrication process is extremely less time-consuming and cost-effective. The electrochemical test of the proposed DE-Al was systematically conducted by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS), along with the in-depth characterizations of the surface. From these studies, the DE-Al offers exceptional electrochemical properties compared with other structures, which were utilized as the electrodes in the polyvinyl alcohol/phosphoric acid (PVA/H3PO4) gel electrolyte. The improved performance apparently evidenced from the electrochemical tests of fabricated SC resulted from the enhanced electrical conductivity and large active surface area. The specific capacitance and cycle-life stability of the DE-SC were investigated by using a GCD analysis. Additionally, the EIS curves before and after stability test (for 3500 cycles) were obtained to prove the long-term endurance of DE-SC. A vertical contact and the separation mode of the TENG were also fabricated by using the same DE-Al as a positive layer and polydimethylsiloxane (PDMS) as a negative layer. Finally, the fabricated SC and TENG were successfully combined using a bridge rectifier to convert and store the mechanical energy as electrical energy. This simple design and facile fabrication of a double-layered-electrode-based structure is promising for the development of an energy conversion and storage device.

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Transition-metal-based layered double hydroxides tailored for energy conversion and storage

Journal of Materials Chemistry A ◽

10.1039/c7ta09370e ◽

2018 ◽

Vol 6 (1) ◽

pp. 12-29 ◽

Cited By ~ 80

Author(s):

Rajkumar Patel ◽

Jung Tae Park ◽

Madhumita Patel ◽

Jatis Kumar Dash ◽

E. Bhoje Gowd ◽

...

Keyword(s):

Energy Storage ◽

Transition Metal ◽

Energy Conversion ◽

Surface Area ◽

Layered Double Hydroxides ◽

Energy Storage Materials ◽

Storage Materials ◽

Energy Conversion And Storage ◽

Double Hydroxides ◽

And Storage

Transition metal based layered double hydroxides are important energy storage materials. The overall performances of the electrodes are dependent on conductivity, crystallinity, morphology, and surface area.

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LaFeO3 Modified RuO2 for Enhancing Electrochemical Performances

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1013.3 ◽

2020 ◽

Vol 1013 ◽

pp. 3-8

Author(s):

Shuai Li ◽

Zhi Gang Zhang ◽

Xin Yuan Chen ◽

Xiao Yu Jiang

Keyword(s):

Cyclic Voltammetry ◽

Surface Area ◽

Active Surface ◽

Active Species ◽

Active Surface Area ◽

Electrochemical Performances ◽

Rutile Structure ◽

X Ray ◽

Measurement Results ◽

Charge Analysis

LaFeO3 nanoparticles-modified RuO2 and RuO2 samples were fabricated by a thermal decomposition and was characterized by powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and cyclic voltammetry tests. XRD results reveal that the RuO2 and RuO2-LaFeO3 samples are mainly a rutile structure. Compared with the RuO2 sample, the RuO2-LaFeO3 sample has smaller crystalline grain size. Cyclic voltammetry analysis shows the voltammetric behaviour and the characteristic potentials of the RuO2 and the RuO2-LaFeO3 samples are similar in 1.0 M KOH solution. Voltammetric charge analysis reveals that the RuO2-LaFeO3 sample has higher concentrated of surface active species and larger exposed surface area than the RuO2 sample. Capacitive measurement results show the Double-layer capacitance (Cdl) and the electrochemical surface area (ECSA) values of the RuO2-LaFeO3 sample are approximately 2 times larger than those of the RuO2 sample, indicating that the electrochemical active surface area increase when integrating of RuO2 with LaFeO3 nanoparticles.

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Doping mechanism directed graphene applications for energy conversion and storage

Journal of Materials Chemistry A ◽

10.1039/d0ta11939c ◽

2021 ◽

Author(s):

Hien Trang Nguyen ◽

Dan Yang ◽

Bo Zhu ◽

Han Lin ◽

Tianyi Ma ◽

...

Keyword(s):

Thermal Conductivity ◽

Optical Absorption ◽

Energy Conversion ◽

Surface Area ◽

Energy Conversion And Storage ◽

Electron Transportation ◽

Doping Mechanism ◽

And Storage

Due to ultrabroadband optical absorption, large theoretical surface area, outstanding thermal conductivity and massless electron transportation, graphene has been considered as a prospective candidate in the applications of energy conversion...

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Solar driven electrochromic photoelectrochemical fuel cells for simultaneous energy conversion, storage and self-powered sensing

Nanoscale ◽

10.1039/c7nr09275j ◽

2018 ◽

Vol 10 (7) ◽

pp. 3421-3428 ◽

Cited By ~ 18

Author(s):

Yanhu Wang ◽

Lina Zhang ◽

Kang Cui ◽

Caixia Xu ◽

Hao Li ◽

...

Keyword(s):

Fuel Cells ◽

Fuel Cell ◽

Energy Conversion ◽

Efficient Energy ◽

Highly Efficient ◽

Energy Conversion And Storage ◽

Self Powered ◽

And Storage

One solar-driven electrochromic photoelectrochemical fuel cell (PFC) with highly efficient energy conversion and storage is easily constructed to achieve quantitative self-powered sensing.

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Bimetallic AC/Ag2CrO4/SnS heterostructure photoanode for energy conversion and storage: A self-powered Photocapacitor

Journal of Power Sources ◽

10.1016/j.jpowsour.2021.230883 ◽

2022 ◽

Vol 520 ◽

pp. 230883

Author(s):

Thirunavukarasu Kajana ◽

Arumugam Pirashanthan ◽

Akila Yuvapragasam ◽

Dhayalan Velauthapillai ◽

Punniamoorthy Ravirajan ◽

...

Keyword(s):

Energy Conversion ◽

Energy Conversion And Storage ◽

Self Powered ◽

And Storage

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Electrocatalysis at Electrodes for VanadiumRedox Flow Batteries

Batteries ◽

10.3390/batteries4030047 ◽

2018 ◽

Vol 4 (3) ◽

pp. 47 ◽

Cited By ~ 14

Author(s):

Yuping Wu ◽

Rudolf Holze

Keyword(s):

Electrical Energy ◽

Active Surface ◽

Careful Examination ◽

Active Surface Area ◽

Redox Systems ◽

Wide Range ◽

Flow Batteries ◽

Energy Conversion And Storage ◽

Improved Performance ◽

And Storage

Flow batteries (also: redox batteries or redox flow batteries RFB) are briefly introduced as systems for conversion and storage of electrical energy into chemical energy and back. Their place in the wide range of systems and processes for energy conversion and storage is outlined. Acceleration of electrochemical charge transfer for vanadium-based redox systems desired for improved performance efficiency of these systems is reviewed in detail; relevant data pertaining to other redox systems are added when possibly meriting attention. An attempt is made to separate effects simply caused by enlarged electrochemically active surface area and true (specific) electrocatalytic activity. Because this requires proper definition of the experimental setup and careful examination of experimental results, electrochemical methods employed in the reviewed studies are described first.

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ZnO nanorods@conductive carbon black nanocomposite based flexible integrated system for energy conversion and storage through triboelectric nanogenerator and supercapacitor

Nano Energy ◽

10.1016/j.nanoen.2020.105726 ◽

2021 ◽

Vol 82 ◽

pp. 105726

Author(s):

Nagabandi Jayababu ◽

Daewon Kim

Keyword(s):

Carbon Black ◽

Energy Conversion ◽

Zno Nanorods ◽

Integrated System ◽

Triboelectric Nanogenerator ◽

Conductive Carbon Black ◽

Energy Conversion And Storage ◽

And Storage

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Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

10.26434/chemrxiv.7770338.v1 ◽

2019 ◽

Cited By ~ 1

Author(s):

Kailun Yang ◽

Recep Kas ◽

Wilson A. Smith

Keyword(s):

Surface Area ◽

High Surface ◽

High Surface Area ◽

Catalyst Layer ◽

Active Surface ◽

Active Surface Area ◽

High Concentration ◽

Copper Electrodes ◽

Surface Enhanced ◽

Local Current

This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO2 electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO2 electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO2 electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer.

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