Solution-processed poly(3,4-ethylenedioxythiophene) nanocomposite paper electrodes for high-capacitance flexible supercapacitors

2016 ◽  
Vol 4 (5) ◽  
pp. 1714-1722 ◽  
Author(s):  
Zhaohui Wang ◽  
Petter Tammela ◽  
Jinxing Huo ◽  
Peng Zhang ◽  
Maria Strømme ◽  
...  
Keyword(s):  
Surface Area ◽  
Sheet Resistance ◽  
High Surface ◽  
High Surface Area ◽  
Building Blocks ◽  
Solution Processed ◽  
Chemical Polymerization ◽  
High Capacitance ◽  
Capacitive Performance ◽  
Flexible Supercapacitors

Nanostructured flexible PEDOT paper can be constructed by straightforward chemical polymerization on nanocellulose building blocks, yielding a high surface area, low sheet resistance and outstanding capacitive performance.

Synthesis and Characterization of Flower-Like Co–La Oxide Micro/Nano Materials

2014 ◽  
Vol 1058 ◽  
pp. 25-29
Author(s):  
Shi Jing Lin ◽  
Wu Tong Du ◽  
Ting Ting Ding ◽  
Yu Zhao ◽  
You Zhao ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Building Blocks ◽  
Cobalt Nitrate ◽  
Element Distribution ◽  
Bet Surface Area ◽  
Ammonium Bromide ◽  
Micrometer Scale

Flower-like Co–La oxide micro/nanomaterials have been synthesized via an ethylene-glycol-mediated process, under the condition of that the mole ratio of lanthanum nitrate (La (NO3)3·6H2O) and cobalt nitrate (Co (NO3)2·6H2O) was 1:1 (based on the amount of Co (NO3)2·6H2O 0.002 mol), the dosage of urea was 2.2 g, the dosage of tetra-butyl ammonium bromide (TBAB) was 6.0 g, with magnetic stirring heating under 170 °C for 60 minutes in the 150mL ethylene glycol, the prepared precursors of Co–La oxides have regular flower-like morphology, in addition, the amount of TBAB and urea plays a significant role on the synthesis of the precursors. The flower-like Co–La oxides micro/nanomaterials were prepared after the precursors were calcinated in the muffle furnace at 800 °C for 2 h, the morphology, crystal properties and element distribution of the products were investigated by the analysis of SEM-EDX, XRD and BET, etc. The structures of these products with regular flower-like morphology are on the micrometer scale, which are hierarchically composed of nanosized building blocks, with highly polycrystalline nature, and the Brunauer–Emmett–Teller (BET) surface area of 68.5 m2/g. Therefore, those micro/nanomaterials have been developed as promising catalytic materials for their not only keeping the high surface area of nanomaterials, but effectively inhibiting aggregation.

scholarly journals Facile Hydrothermal Synthesis and Supercapacitor Performance of Mesoporous Necklace-Type ZnCo2O4 Nanowires

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1516
Author(s):  
John Anthuvan Rajesh ◽  
Kwang-Soon Ahn
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Specific Capacity ◽  
High Surface Area ◽  
Negative Electrode ◽  
Building Blocks ◽  
High Specific Capacity ◽  
Supercapacitor Performance ◽  
Subsequent Calcination ◽  
Excellent Stability

In this work, mesoporous ZnCo2O4 electrode material with necklace-type nanowires was synthesized by a simple hydrothermal method using water/ethylene glycol mixed solvent and subsequent calcination treatment. The ZnCo2O4 nanowires were assembled by several tiny building blocks of nanoparticles which led to the growth of necklace-type nanowires. The as-synthesized ZnCo2O4 nanowires had porous structures with a high surface area of 25.33 m2 g−1 and with an average mesopore of 23.13 nm. Due to the higher surface area and mesopores, the as-prepared necklace-type ZnCo2O4 nanowires delivered a high specific capacity of 439.6 C g−1 (1099 F g−1) at a current density of 1 A g−1, decent rate performance (47.31% retention at 20 A g−1), and good cyclic stability (84.82 % capacity retention after 5000 cycles). Moreover, a hybrid supercapacitor was fabricated with ZnCo2O4 nanowires as a positive electrode and activated carbon (AC) as a negative electrode (ZnCo2O4 nanowires//AC), which delivered an energy density of 41.87 Wh kg−1 at a power density of 800 W kg−1. The high electrochemical performance and excellent stability of the necklace-type ZnCo2O4 nanowires relate to their unique architecture, high surface area, mesoporous nature, and the synergistic effect between Zn and Co metals.

scholarly journals Exploring frontiers of crystalline porous materials

2014 ◽  
Vol 70 (a1) ◽  
pp. C1620-C1620
Author(s):  
Maciej Haranczyk ◽  
Richard Martin
Keyword(s):  
Porous Materials ◽  
Surface Area ◽  
Chemical Space ◽  
High Surface ◽  
3D Structure ◽  
High Surface Area ◽  
Combinatorial Libraries ◽  
Internal Surface ◽  
Building Blocks ◽  
Geometrical Properties

We present a computational framework for the rapid identification and characterization of high surface area materials from within the vast chemical space of crystalline porous materials such as metal-organic frameworks (MOFs) or covalent organic frameworks (COFs). MOFs and COFs have been the subject of intense research interest due largely to their highly tunable structural properties and record-breaking internal surface areas; gravimetric surface area is one of the most addressed properties of porous materials, and has seen improvement by approximately a factor of twenty since the first reports. However, the design of MOFs with optimum chemical and geometrical properties remains a great challenge, due to the vast combinatorial space of building blocks and topologies in which they can be arranged. Efforts to identify high-performance materials have involved trial-and-error, observation-based design, computational enumeration and screening of large combinatorial libraries as well as optimization-based approaches. In our presentation, we will give an overview of techniques under development in our group, in particular, algorithms for 3D structure model assembly and material characterization. We will also present how these tools can be employed in both enumeration and optimization-based discovery of novel materials.

scholarly journals Facile synthesis of high-surface-area nanoporous carbon from biomass resources and its application in supercapacitors

RSC Advances ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 1857-1865 ◽  
Author(s):  
Yuechao Yao ◽  
Qi Zhang ◽  
Peng Liu ◽  
Liang Yu ◽  
Lin Huang ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Activation Process ◽  
Facile Synthesis ◽  
Electrochemical Test ◽  
High Capacitance ◽  
Biomass Resources ◽  
Pyrolysis Of Biomass

High-surface-area nanoporous carbon is obtained by direct pyrolysis of biomass resources without an activation process. An electrochemical test shows high capacitance.

Highly mesoporous and high surface area carbon: A high capacitance electrode material for EDLCs with various electrolytes

2008 ◽  
Vol 10 (5) ◽  
pp. 795-797 ◽  
Author(s):  
Bin Xu ◽  
Feng Wu ◽  
Renjie Chen ◽  
Gaoping Cao ◽  
Shi Chen ◽  
...  
Keyword(s):  
Surface Area ◽  
Electrode Material ◽  
High Surface ◽  
High Surface Area ◽  
High Capacitance

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

2019 ◽  
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

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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. </p> <p> </p>

scholarly journals Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10974-10981 ◽  
Author(s):  
Xiulin Yang ◽  
Ang-Yu Lu ◽  
Yihan Zhu ◽  
Shixiong Min ◽  
Mohamed Nejib Hedhili ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Efficiency ◽  
Carbon Cloth ◽  
Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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