Influence of electrochemical active surface area on the oxygen evolution reaction and energy storage performance of MnO 2 ‐multiwalled carbon nanotube composite

2021 ◽  
Author(s):  
Atanu Roy ◽  
Apurba Ray ◽  
Samik Saha ◽  
Monalisa Ghosh ◽  
Trisha Das ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Energy Storage ◽  
Surface Area ◽  
Oxygen Evolution Reaction ◽  
Active Surface ◽  
Active Surface Area ◽  
Multiwalled Carbon ◽  
Storage Performance ◽  
Carbon Nanotube Composite ◽  
Electrochemical Active Surface Area

Progress on nanoparticle-based carbon nanotube complex: fabrication and potential application

2016 ◽  
Vol 36 (4) ◽  
Author(s):  
Amin Termeh Yousefi ◽  
Minoru Fukumori ◽  
Pandey Reetu Raj ◽  
Polin Liu ◽  
Lingxiang Fu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Surface Area ◽  
Nanostructured Materials ◽  
Potential Application ◽  
Active Surface ◽  
Semiconductor Nanoparticles ◽  
Active Surface Area ◽  
Recent Developments ◽  
Magnetic Applications

AbstractCarbon nanotubes (CNTs) are considered as one of the most intensively explored nanostructured materials and have been widely used as a platform material for metal and semiconductor nanoparticles (NPs) due to their large and chemically active surface area. Several approaches have been described in the literature to immobilize NPs on the surface of CNTs. This report reviews the recent developments in this area by exploring the various techniques where nanotubes can be functionalized with NPs to improve the optical, mechanical, thermal, medical, electrical, and magnetic applications of CNTs.

Comparison of the effects of cation and phosphorus doping in cobalt-based spinel oxides towards the oxygen evolution reaction

CrystEngComm ◽  
2021 ◽  
Author(s):  
Lili Yao ◽  
Wenxiu Yang ◽  
Yongjian Niu ◽  
Jiming Liu ◽  
Shun Zhang ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Oxygen Vacancies ◽  
Active Surface ◽  
Active Surface Area ◽  
Phosphorus Doping ◽  
Electrochemically Active ◽  
Spinel Oxides ◽  
Electrochemically Active Surface

Phosphorus incorporation further boosted the OER activity of cation-doped Co-based spinel oxides via remarkably tuning the oxygen vacancies, crystallinity and electrochemically active surface area on the surface.

scholarly journals Multifunctional structural energy storage composite supercapacitors

2014 ◽  
Vol 172 ◽  
pp. 81-103 ◽  
Author(s):  
Natasha Shirshova ◽  
Hui Qian ◽  
Matthieu Houllé ◽  
Joachim H. G. Steinke ◽  
Anthony R. J. Kucernak ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibre ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Active Surface ◽  
Initial Reaction ◽  
Active Surface Area ◽  
Carbon Fibres ◽  
Structural Carbon

This paper addresses the challenge of producing multifunctional composites that can simultaneously carry mechanical loads whilst storing (and delivering) electrical energy. The embodiment is a structural supercapacitor built around laminated structural carbon fibre (CF) fabrics. Each cell consists of two modified structural CF fabric electrodes, separated by a structural glass fibre fabric or polymer membrane, infused with a multifunctional polymeric electrolyte. Rather than using conventional activated carbon fibres, structural carbon fibres were treated to produce a mechanically robust, high surface area material, using a variety of methods, including direct etching, carbon nanotube sizing, and carbon nanotubein situgrowth. One of the most promising approaches is to integrate a porous bicontinuous monolithic carbon aerogel (CAG) throughout the matrix. This nanostructured matrix both provides a dramatic increase in active surface area of the electrodes, and has the potential to address mechanical issues associated with matrix-dominated failures. The effect of the initial reaction mixture composition is assessed for both the CAG modified carbon fibre electrodes and resulting devices. A low temperature CAG modification of carbon fibres was evaluated using poly(3,4-ethylenedioxythiophene) (PEDOT) to enhance the electrochemical performance. For the multifunctional structural electrolyte, simple crosslinked gels have been replaced with bicontinuous structural epoxy–ionic liquid hybrids that offer a much better balance between the conflicting demands of rigidity and molecular motion. The formation of both aerogel precursors and the multifunctional electrolyte are described, including the influence of key components, and the defining characteristics of the products. Working structural supercapacitor composite prototypes have been produced and characterised electrochemically. The effect of introducing the necessary multifunctional resin on the mechanical properties has also been assessed. Larger scale demonstrators have been produced including a full size car boot/trunk lid.

scholarly journals Hexadecyltrimethylammonium hydroxide promotes electrocatalytic activity for the oxygen evolution reaction

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Yugan Gao ◽  
Chengqi Wu ◽  
Sen Yang ◽  
Yiwei Tan
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Surface ◽  
Ammonia Borane ◽  
Absolute Number ◽  
Alkaline Electrolyte ◽  
Active Surface Area ◽  
Electrochemically Active ◽  
Electrochemically Active Surface

Abstract The oxygen evolution reaction is an essential factor in many renewable energy technologies, such as water splitting, fuel cells, and metal–air batteries. Here we show a unique solution to improve the oxygen evolution reaction rate by adjusting the electrolyte composition via the introduction of hexadecyltrimethylammonium hydroxide into an alkaline electrolyte. The strong adsorption of hexadecyltrimethylammonium cations on the surface of electrocatalysts provides the increased absolute number of OH− ions near the electrocatalyst surface, which effectively promotes the oxygen evolution reaction performance of electrocatalysts, such as Fe1−yNiyS2@Fe1−xNixOOH microplatelets and SrBaNi2Fe12O22 powders. Meanwhile, we present an electrochemical conditioning approach to engineering the electrochemically active surface area of electrocatalysts, by which the resultant Fe1−yNiyS2@Fe1−xNixOOH microplatelets have a larger electrochemically active surface area after the electrochemical conditioning of the as-synthesized Fe1−yNiyS2 microplatelets using ammonia borane than those obtained after the conventional electrochemical conditioning without ammonia borane, presumably due to the appropriate conversion rate of Fe1−xNixOOH shells.

scholarly journals The Determination of Electrochemical Active Surface Area and Specific Capacity Revisited for the System MnOx as an Oxygen Evolution Catalyst

2020 ◽  
Vol 234 (5) ◽  
pp. 979-994 ◽  
Author(s):  
Paula Connor ◽  
Jona Schuch ◽  
Bernhard Kaiser ◽  
Wolfram Jaegermann
Keyword(s):  
Specific Capacitance ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Specific Capacity ◽  
Active Surface ◽  
Capacitance Measurement ◽  
Catalyst Loading ◽  
Active Surface Area ◽  
Electrochemical Active Surface Area

AbstractIn the last decades several different catalysts for the electrochemical water splitting reaction have been designed and tested. In so-called benchmark papers they are compared with respect to their efficiency and activity. In order to relate the different catalyst to each other the definition of well-defined procedures is required. Two different methods are mainly used: Either the normalization with respect to the geometric surface area or to the catalyst loading. Most often only one of these values is available for a sample and the other one cannot be estimated easily. One approach in electrocatalysis is to determine the Helmholtz double layer capacitance (DLC) and deduce the electrochemical active surface area (ECSA). The DLC can be obtained from two different methods, either using differential capacitance measurement (DCM) or impedance spectroscopy (EIS). The second value needed for the calculation of the ECSA is the specific capacitance, which is the capacitance for a perfectly flat surface of given catalyst material. Here, we present the determination of the different capacitance values using manganese oxide as the exemplary model for the oxygen evolution reaction (OER). We determine the capacitance by DCM and EIS to calculate the ECSA using literature values for the specific capacitance. The obtained values are comparable from the two methods, but are much larger than the surface areas obtained by atomic force microscopy. Therefore, we consider the possibility of using the measured AFM area together with the Helmholtz capacitance to determine the specific capacitances for this material class. The comparison of these results with literature values illustrates the actual limits of the ECSA method, which will be discussed in this paper.

Synthesis and Characterization of High Electrocatalytic Active Nanosized RuO2 Powder with Narrow Distribution by Ultrasonic Precipitation

2011 ◽  
Vol 347-353 ◽  
pp. 3464-3467
Author(s):  
Xin Xin Zhang ◽  
Da Lv ◽  
Chun Ma ◽  
Mang Xue
Keyword(s):  
Size Distribution ◽  
Polarization Curve ◽  
Oxygen Evolution Reaction ◽  
Active Surface ◽  
Synthesis And Characterization ◽  
Active Surface Area ◽  
Narrow Size Distribution ◽  
Magnetic Stirring ◽  
Electrochemical Active Surface Area

In this paper, synthesis of RuO2 with uniform nanosized sphere-like morphologies by ultrasonic precipitation using ammonia is presented. The structures, properties and electrocatalytic performance of materials were characterized by XRD, FE-SEM, CV and polarization curve. FE-SEM photographs showed that the sample prepared by ultrasonic precipitation has a relatively narrow size distribution compared with the sample prepared by conventional precipitation with magnetic stirring. The CV and polarization curve for OER (oxygen evolution reaction) confirmed that electrochemical active surface area and OER activity of sample by ultrasonic precipitation are higher than that of sample by conventional precipitation under magnetic stirring.

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