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Runzhi Zhang, Kang Yan, Anthony Palumbo, Jian Xu, Shichen Fu, Eui-Hyeok Yang
We present an all-solid-state flexible and stretchable pseudocapacitor composed of dodecylbenzenesulfonate-doped polypyrrole (PPy(DBS))-coated vertically aligned carbon nanotubes (VACNTs) partially embedded in a polydimethylsiloxane (PDMS) substrate. VACNTs are grown via atmospheric-pressure chemical vapor deposition (APCVD) on a Si/SiO₂ substrate and transferred onto PDMS. Then the PPy(DBS) film is coated with a surface charge of 300 mC/cm2 on individual carbon nanotubes (CNTs) via electropolymerization...
November 15, 2018: Nanotechnology
Samanta Witomska, Włodzimierz Czepa, Zhaoyang Liu, Alessandro Aliprandi, Dawid Pakulski, Piotr Pawluc, Artur Ciesielski, Paolo Samorì
Towards the introduction of fast faradaic pseudocapacitive behavior and the increase of the specific capacitance of carbon-based electrodes, we have covalently functionalized graphene oxide with a redox active thiourea-formaldehyde polymer yield-ing a multifunctional hybrid system. The multiscale physical and chemical characterization of the novel 3-dimensional hy-brid revealed high material's porosity with high specific surface area (402 m2 g-1) and homogeneous element distribution. The presence of multiple functional groups comprising sulphur, nitrogen and oxygen, provide additional contribution of Faradic redox reaction in supercapacity performance, leading to a high effective electrochemical pseudocapacitance...
December 5, 2018: Journal of the American Chemical Society
Ali Ehsani, Ali Akbar Heidari, Hamid Mohammad Shiri
This review gives an overview of the synthesis, surface and electrochemical investigations over ternary nanocomposite of conductive polymers in the development of new supercapacitors. They utilize both Faradaic and non-Faradaic procedures to store charge, leading to higher specific capacitance and energy density, higher cell voltage, longer life cycle and moderated power density. Owing to a unique combination of features such as superb electrical conductivity, corrosion resistance in aqueous electrolytes, highly modifiable nanostructures, long cycle life and the large theoretical specific-surface area, the use of ternary nanocomposites as a supercapacitor electrode material has become the focus of a significant amount of current scientific researches in the field of energy storage devices...
November 27, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Yinghui Shang, Junjie Wei, Chu Wu, Qigang Wang
Polymer gel electrolytes (PGEs) have been considered as one of the most promising candidates to solve safety and flexibility issues in wearable devices. To supply energy for the daily-used epidermal electronic systems, biaxial stretchability and temperature tolerance are essential for energy storage units. However, the limited choices of PGEs, including fragile poly(vinyl alcohol) and uniaxial stretchable polyacrylamide hydrogel, lag far behind the requirement of wearable supercapacitors. Herein, an adhesive organohydrogel with a water/ethylene glycol binary solvent is tailored as the electrolyte of an all-climate, biaxially stretchable pseudocapacitor...
November 30, 2018: ACS Applied Materials & Interfaces
Pattarachai Srimuk, Juhan Lee, Öznil Budak, Jaehoon Choi, Ming Chen, Guang Feng, Christian Prehal, Volker Presser
Aqueous electrolytes can be used for electrical double-layer capacitors, pseudocapacitors, and intercalation-type batteries. These technologies may employ different electrode materials, most importantly high-surface-area nanoporous carbon, two-dimensional materials, and metal oxides. All of these materials also find more and more applications in electrochemical desalination devices. During the electrochemical operation of such electrode materials, charge storage and ion immobilization are accomplished by non-Faradaic ion electrosorption, Faradaic ion intercalation at specific crystallographic sites, or ion insertion between layers of two-dimensional materials...
October 29, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Tao Ling, Pengfei Da, Xueli Zheng, Binghui Ge, Zhenpeng Hu, Mengying Wu, Xi-Wen Du, Wen-Bin Hu, Mietek Jaroniec, Shi-Zhang Qiao
Atomic-level structure engineering can substantially change the chemical and physical properties of materials. However, the effects of structure engineering on the capacitive properties of electrode materials at the atomic scale are poorly understood. Fast transport of ions and electrons to all active sites of electrode materials remains a grand challenge. Here, we report the radical modification of the pseudocapacitive properties of an oxide material, Zn x Co1- x O, via atomic-level structure engineering, which changes its dominant charge storage mechanism from surface redox reactions to ion intercalation into bulk material...
October 2018: Science Advances
Hui Peng, Rui Zhao, Jing Liang, Sihan Wang, Fei Wang, Jiezi Zhou, Guofu Ma, Ziqiang Lei
Two-dimensional conducting polymers nanosheet prepared by the soft-template-assisted technique in aqueous system still has rarely been reported, especially the formation of nanosheets structure by protonic acid assisted controlling the stability of the micelles method. Herein, a facile, one-step, bottom-up approach is developed to synthesize novel and uniform conductive poly(4-aminodiphenylamine) (P(4-ADPA)) nanosheets with controlled morphology via regulating the proton acid concentration during the self-assembly of surfactant lamellar micelles...
October 31, 2018: ACS Applied Materials & Interfaces
Lushuai Zhang, Trisha L Andrew
Controlling mesoscale organization in thick films of electroactive polymers is crucial for studying and optimizing charge and ion transport in these disordered materials. Conventional approaches focus on directing long-range polymer aggregation and/or crystallization during film formation by using interfaces, flow and/or shear forces. Here, we describe an alternative method that takes advantage of naturally textured biological substrates and vapor-coating to structure thick-conjugated polymer films. Reactive vapor-coating is a technique that enables in situ synthesis of doped conjugated polymers inside a reduced-pressure reactor...
October 26, 2018: ACS Applied Materials & Interfaces
Steffen Heuser, Nianjun Yang, Felix Hof, Anna Schulte, Holger Schönherr, Xin Jiang
High-performance supercapacitors feature big and stable capacitances and high power and energy densities. To fabricate high-performance supercapacitors, 3D 3C-SiC/graphene hybrid nanolaminate films are grown via a microwave plasma-assisted chemical vapor deposition technique. Such films consist of 3D alternating structures of vertically aligned 3C-SiC and graphene layers, leading to high surface areas and excellent conductivity. They are further applied as the capacitor electrodes to construct electrical double layer capacitors (EDLCs) and pseudocapacitors (PCs) in both aqueous and organic solutions...
November 2018: Small
Ying Yang, Dehong Zeng, Senjie Yang, Lin Gu, Baijun Liu, Shijie Hao
Core-shell structured carbon nanofiber@metal oxide is one of the most promising hybrid electrodes as supercapacitors, in which the pseudocapacitive metal oxides can be fully exerted and stabilized on the carbonaceous scaffolds. However, facile fabrication of mesoporous carbon nanofibers and integration of them with metal oxides are challenging. Herein, we report a new type of mesoporous carbon nanofibers (MCNs), derived from zinc-trimesic acid fibers, acting as the scaffolds to anchor nickel cobaltite (NiCo2 O4 ) nanosheets after surface O-functionalization...
January 15, 2019: Journal of Colloid and Interface Science
Xu Zhang, Antonin Prévoteau, Ricardo O Louro, Catarina M Paquete, Korneel Rabaey
Anodic electroactive biofilms (EABs) need to overcome low current densities for applications such as microbial fuel cells or biosensors. EABs can store charge in self-produced redox proteins when temporarily left in open circuit, and discharge them once the electrode is appropriately repolarized, thus behaving as pseudocapacitors. Here we investigated the effect of such periodic polarization on the intrinsic nature of the EABs during their entire growth (i.e. starting from inoculation and for 10 days) on glassy carbon electrodes...
December 15, 2018: Biosensors & Bioelectronics
Samuel R Peurifoy, Jake C Russell, Thomas J Sisto, Yuan Yang, Xavier Roy, Colin Nuckolls
By storing energy from electrochemical processes at the electrode surface, pseudocapacitors bridge the performance gap between electrostatic double-layer capacitors and batteries. In this context, molecular design offers the exciting possibility to create tunable and inexpensive organic electroactive materials. Here we describe a porous structure composed of perylene diimide and triptycene subunits and demonstrate its remarkable performance as a pseudocapacitor electrode material. The material exhibits capacitance values as high as 350 F/g at 0...
September 5, 2018: Journal of the American Chemical Society
José T C Barragan, Everson T S G da Silva, Ana C M de Moraes, Lauro T Kubota
The purpose of this Corrigendum is to cite and comment on an important reference that brings some support to the ideas developed in this paper and should be chronologically inserted into the history of advances in this area.
November 15, 2018: Analytica Chimica Acta
Yuanchao Pang, Shuyang Zhang, Sheng Chen, Jin Liang, Mingyan Li, Dawei Ding, Shujiang Ding
Increasing demand for effective energy-storage systems derived from low-cost and ecofriendly raw materials has aroused wide concern. In this contribution, we propose nitrogen-abundant amorphous micron-sized carbon ribbons (AMCRs) originating from biomass raupo as a novel substrate due to their specific quasi 2D morphologies and outstanding dispersion ability. Owing to the innate nitrogen atoms on the surface of AMCRs, ultrathin binary and ternary metal oxide (NiO, CoO, and NiCo2 O4 ) nanosheets can be uniformly developed under benign conditions...
October 26, 2018: Chemistry: a European Journal
Guilei Zhu, Lin Yang, Weiyi Wang, Min Ma, Jie Zhang, Hao Wen, Dengchao Zheng, Yadong Yao
Ternary metal phosphides with a self-assembled hierarchical nanostructure are promising electrode materials for energy storage and conversion, due to the unique architecture and synergistic effects in bimetallic nanostructures. In this communication, we demonstrate hierarchical Mn-doped cobalt phosphide nanowire decorated nanosheet cluster arrays with robust adhesion on Ni foam (Mn-CoP/NF) as a binder-free electrode for supercapacitors. Such a 3D electrode exhibits boosted areal specific capacitance over that for a single metal counterpart, with the accomplishment of 8...
August 14, 2018: Chemical Communications: Chem Comm
Tao Hu, Yanyan Liu, Yifu Zhang, Meng Chen, Jiqi Zheng, Jie Tang, Changgong Meng
V3 O7 ·H2 O possesses the merit of high specific capacitance, but weakness of cycling stability and low conductivity inhibit its application for energy devices, which requires the addition of carbon materials like carbon nanotubes (CNT) or graphene with properties of high conductivity and brilliant cycling stability to obtain high-performance composites. Since CNT or GO-based binary V3 O7 ·H2 O materials have been rarely studied with limited specific capacitance, we developed a novel, highly porous V3 O7 ·H2 O nanobelts/CNT/reduced graphene oxide (V3 O7 ·H2 O/CNT/rGO) ternary composite with a three-dimensional (3D) hierarchical micro-structure by a single step, facile hydrothermal process and self-assembly method with outstanding electrochemical performances...
December 1, 2018: Journal of Colloid and Interface Science
Yi Min Chen, Bao Zhi Yu, Yu Qing Miao, Fei Gao, Guang Yin Jing, Hai Ming Fan
Three-dimensional hierarchical metal oxide core/shell nanowire arrays (HMONAs) have become promising pseudocapacitive materials due to their integrated smart architectures. However, these core/shell nanostructures have unsatisfactory structural stability and frequently suffer destruction during their fabrication process and their charge-discharge cycles, thus limiting their application lifespan. Herein, a general strategy based on the minimization of the lattice mismatch between the shell and the backbone at the nanoscale interface has been proposed to improve the cycling stability of the HMONAs...
August 7, 2018: Nanoscale
José T C Barragan, Everson T S G da Silva, Ana C M de Moraes, Lauro T Kubota
In this paper, we introduce a novel approach for the detection of electroactive analytes by using oxidant species accumulated in pseudocapacitors surface. We demonstrated that pseudocapacitors can be quickly discharged when in contact with electroactive species. Thus, the variation of potential can be monitored during the discharging process and correlated with the analyte concentration. Based on this, two electroanalytical methods were proposed: continuous discharging detection and pulsed discharging detection...
May 2, 2018: Analytica Chimica Acta
Kathleen Moyer, Jennifer Donohue, Neha Ramanna, Adam P Cohn, Nitin Muralidharan, Janna Eaves, Cary L Pint
Here we demonstrate a full-cell battery design that bridges the energy density and rate capability between that of supercapacitors or pseudocapacitors with that of traditional lithium-ion batteries. This is accomplished by pairing an anode that enables ultrafast ion co-intercalation, an open framework cathode that allows rapid ion diffusion, and linear ether based electrolyte that sustains cell-level stability and high rate performance. We show this platform to be suitable for both sodium and potassium batteries using graphite as the co-intercalation anode, and Prussian blue as the open framework cathode...
July 19, 2018: Nanoscale
Yong-Gang Sun, Jun-Yu Piao, Lin-Lin Hu, De-Shan Bin, Xi-Jie Lin, Shu-Yi Duan, An-Min Cao, Li-Jun Wan
Hollow nanostructures of metal oxides have found broad applications in different fields. Here, we reported a facile and versatile synthetic protocol to prepare hollow metal oxide nanospheres by modulating the chemical properties in solid nanoparticles. Our synthesis design starts with the precipitation of urea-containing metal oxalate, which is soluble in water but exists as solid nanospheres in ethanol. A controlled particle hydrolysis is achieved through the heating-induced urea decomposition, which transforms the particle composition in an outside-to-inside style: The reaction starts from the surface and then proceeds inward to gradually form a water-insoluble shell of basic metal oxalate...
July 25, 2018: Journal of the American Chemical Society
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