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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...
October 11, 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...
September 12, 2018: 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...
August 6, 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
Jia Ding, Wenbin Hu, Eunsu Paek, David Mitlin
In this critical Review we focus on the evolution of the hybrid ion capacitor (HIC) from its early embodiments to its modern form, focusing on the key outstanding scientific and technological questions that necessitate further in-depth study. It may be argued that HICs began as aqueous systems, based on a Faradaic oxide positive electrode (e.g., Co3 O4 , RuO x ) and an activated carbon ion-adsorption negative electrode. In these early embodiments HICs were meant to compete directly with electrical double layer capacitors (EDLCs), rather than with the much higher energy secondary batteries...
July 25, 2018: Chemical Reviews
Pengju Li, Yang Gui, Daniel John Blackwood
Toxic metal ions, such as Ni2+ and Mn2+ , in industrial waste streams are nonbiodegradable and can cause damage to the human body. Electrochemical cleaning techniques are attractive as they offer more control and produce less sludge than do chemical/biological approaches without the high pressures needed for membranes. Here, nanoneedle-structured α-MnO2 /carbon fiber paper (CFP) composites were synthesized by a hydrothermal approach and used as electrodes for combined electroadsorption and capacitive deionization removal of nickel and manganese ions from pseudoindustrial waste streams...
June 13, 2018: ACS Applied Materials & Interfaces
Ruocun Wang, James B Mitchell, Qiang Gao, Wan-Yu Tsai, Shelby Boyd, Matt Pharr, Nina Balke, Veronica Augustyn
The presence of structural water in tungsten oxides leads to a transition in the energy storage mechanism from battery-type intercalation (limited by solid state diffusion) to pseudocapacitance (limited by surface kinetics). Here, we demonstrate that these electrochemical mechanisms are linked to the mechanical response of the materials during intercalation of protons and present a pathway to utilize the mechanical coupling for local studies of electrochemistry. Operando atomic force microscopy dilatometry is used to measure the deformation of redox-active energy storage materials and to link the local nanoscale deformation to the electrochemical redox process...
May 21, 2018: ACS Nano
Jae Young Seok, Jaehak Lee, Minyang Yang
The rapid development of electric vehicles is increasing the demand for next-generation fast-charging energy storage devices with a high capacity and long-term stability. Metal oxide/hydroxide pseudocapacitors are the most promising technology because they show a theoretical capacitance that is 10-100 times higher than that of conventional supercapacitors and rate capability and long-term stability that are much higher than those of Li-ion batteries. However, the poor electrical conductivity of metal oxides/hydroxides is a serious obstacle for achieving the theoretical pseudocapacitor performance...
May 23, 2018: ACS Applied Materials & Interfaces
Tian Meng, Zongkui Kou, Ibrahim Saana Amiinu, Xufeng Hong, Qingwei Li, Yongfu Tang, Yufeng Zhao, Shaojun Liu, Liqiang Mai, Shichun Mu
Tuning the electron structure is of vital importance for designing high active electrode materials. Here, for boosting the capacitive performance of tungsten oxide, an atomic scale engineering approach to optimize the electronic structure of tungsten oxide by Ni doping is reported. Density functional theory calculations disclose that through Ni doping, the density of state at Fermi level for tungsten oxide can be enhanced, thus promoting its electron transfer. When used as electrode of supercapacitors, the obtained Ni-doped tungsten oxide with 4...
May 2018: Small
Zhichang Pan, Yingchang Jiang, Peiyu Yang, Zeyi Wu, Wenchao Tian, Liu Liu, Yun Song, Qinfen Gu, Dalin Sun, Linfeng Hu
Two-dimensional (2D) hydroxide nanosheets can exhibit exceptional electrochemical performance owing to their shortened ion diffusion distances, abundant active sites, and various valence states. Herein, we report ZnCo1.5 (OH)4.5 Cl0.5 ·0.45H2 O nanosheets (thickness ∼30 nm) which crystallize in a layered structure and exhibit a high specific capacitance of 3946.5 F g-1 at 3 A g-1 for an electrochemical pseudocapacitor. ZnCo1.5 (OH)4.5 Cl0.5 ·0.45H2 O was synthesized by a homogeneous precipitation method and spontaneously crystallized into 2D nanosheets in well-defined hexagonal morphology with crystal structure revealed by synchrotron X-ray powder diffraction data analysis...
March 27, 2018: ACS Nano
Masashi Okubo, Akira Sugahara, Satoshi Kajiyama, Atsuo Yamada
The development of efficient electrochemical energy storage (EES) devices is an important sustainability issue to realize green electrical grids. Charge storage mechanisms in present EES devices, such as ion (de)intercalation in lithium-ion batteries and electric double layer formation in capacitors, provide insufficient efficiency and performance for grid use. Intercalation pseudocapacitance (or redox capacitance) has emerged as an alternative chemistry for advanced EES devices. Intercalation pseudocapacitance occurs through bulk redox reactions with ultrafast ion diffusion...
March 20, 2018: Accounts of Chemical Research
Filip Podjaski, Julia Kröger, Bettina V Lotsch
Graphitic carbon nitrides have emerged as an earth-abundant family of polymeric materials for solar energy conversion. Herein, a 2D cyanamide-functionalized polyheptazine imide (NCN-PHI) is reported, which for the first time enables the synergistic coupling of two key functions of energy conversion within one single material: light harvesting and electrical energy storage. Photo-electrochemical measurements in aqueous electrolytes reveal the underlying mechanism of this "solar battery" material: the charge storage in NCN-PHI is based on the photoreduction of the carbon nitride backbone and charge compensation is realized by adsorption of alkali metal ions within the NCN-PHI layers and at the solution interface...
March 2018: Advanced Materials
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