High-performance Energy Storage Applications Research Articles

Review on Microfluidic Construction of Advanced Nanomaterials for High-Performance Energy Storage Applications

Review on Microfluidic Construction of Advanced Nanomaterials for High-Performance Energy Storage Applications

One-step electrodeposited Co and Mn layered double hydroxides on Ni foam for high-performance aqueous asymmetric supercapacitors

In this work, we report a high-performance and self-standing supercapacitor electrode composed of a Co and Mn layered double hydroxide (CoMn-LDH) nanostructure on Ni foam (NF) prepared by one-step electrochemical deposition. The CoMn-LDH electrode delivers a high capacitance of ~2673.6 F g−1 at 1 A g−1, with the excellent rate performance (~1488.0 F g−1 at 60 A g−1) and good cycle stability (~86.7% capacitance retention after 5000 cycles at 12 A g−1). The asymmetric supercapacitors assembled using the cathode of CoMn-LDH, the anode of activated carbon on carbon cloth and the electrolyte of 2.0 M KOH yield an energy density of ~97.5 W h kg−1 at 800.0 W kg−1, good cycling performance of ~89.2% capacitance retention after 5000 cycles at 5 A g−1 with the Columbic efficiency around 100%. These results indicate that the CoMn-LDH nanostructure on NF is a promising electrode for high-performance energy storage applications.

High potential of yellow potato (Solanum Tuberosum L.) peel waste as porous carbon source for supercapacitor electrodes

Yellow potato peel contains chemical components such as protein, fiber, starch and sugar which is composed atom carbon chains bonding. Heating potato peel at high temperatures can disrupt the bonding of the carbon atoms of the constituents, vaporizing volatile compounds, thereby producing high carbon fixed. This study preparation yellow potato peel-based carbon electrodes through a single-stage integrated pyrolysis with carbonization from room temperature to 600 °C in N2 gas atmosphere followed by physical activation to a temperature of 850°C in CO2 gas environment. The impregnation of ZnCl2 at different concentrations was optimized as an independent variable precursor to produce porous activated carbon for energy storage devices. The difference in concentration of 0.1M, 0.3M and 0.5M ZnCl2 can increase the porosity, structure of amorphous carbon and the resulting high electrochemical performance. Electrochemical properties were characterized using cyclic voltammetry and galvanostatic charge discharge methods in an aqueous electrolyte of 1M H2SO4 at a voltage of 0-1000 mV and a scanning rate of 1 mV s−1. Furthermore, the resulting specific capacitance increased from 82.82 F g−1, 195.66 F g−1 and 147.03 F g−1 based on the effect of the concentration of the chemical activator ZnCl2. While the specific capacitance obtained using the GCD method shows higher numbers, namely 145.13 F g−1, 223.25 F g−1 and 174.08 F g−1. Energy density 27.18 Wh kg−1 and power density 97.93 W kg−1 from cv method. The simple approach of activated carbon from potato peel waste is expected to produce an economical and simple porous carbon electrode for high performance energy storage application.

Bismuth manganese oxide based electrodes for asymmetric coin cell supercapacitor

• Bismuth manganese oxide nanoflakes are synthesised by one step hydrothermal method. • Kinetics of charge transfer was explained using different techniques. • The diffusion and capacitive controlled contribution are differentiatedon the basis of CV data. • Coin cell device is fabricated for good performance practical application. Binary metal oxides are deposited via simple chemical routes for high-performance energy storage applications. In this work, we developed nanostructures of BiMnO 3 on Ni foam using a hydrothermal method. Initially, the (0 1 0) and (1 1 0) planes confirmed the presence of the BiMnO 3 phase. Snow fungus-like nanostructure was transferred to porous interconnected nanoflakes with an increase in deposition time. These nanoflakes serve as large active sites that are beneficial for the diffusion of electrolytic ions that enhance the charge storage and transport process. Consequently, the two-dimensional interconnected nanoflakes showed a high diffusion coefficient, standard rate constant, and minimum transfer coefficient. In addition, BiMnO 3 exhibited an aerial capacitance of 6000 mF cm −2 (1500 Fg −1 ) with an energy density of 102 Wh kg −1 at an applied current density of 20 mA cm −2 . For practical applications, an asymmetric coin cell (ACC) device was assembled using BiMnO 3 as the positive electrode and activated carbon as the negative electrode in 3 M aqueous KOH as an electrolyte. The fabricated ACC device had an energy density of 14.4 Wh kg −1 at a power density of 50 W kg −1 with a 1.2 V potential; the capacitive retention was 90 %, with 97 % Coulombic efficiency up to 5000 cycles. Accordingly, the results determined that BiMnO 3 can be used as an electrode material for high-performance energy storage applications.

Printable electrode materials for supercapacitors

The invention of printing technologies has revolutionized the manner in which information is transmitted and reproduced. In the modern era, printing technologies , which are equipped with computerized control and design methods, have become considerably efficient and effective, facilitating A significant breakthrough in the manufacture of high-performance electrochemical energy storage systems. Through careful design and execution, the components of energy storage devices, particularly electrodes, can be formulated into functional inks, enabling the use of divers materials and devices in high-performance energy storage applications. This reviewfocuses on three major printing technologies: inkjet printing, screen printing, and 3D printing, introducing the principles of each printing technology, the design and preparation of various electrode inks, and their applications in supercapacitors. Finally, the challenges and scope for the future development of printing technologies forhigh-performance supercapacitors are presented.

Tuning aprotic solvent properties with long alkyl chain ionic liquid for lithium-based electrolytes

Lithium–metal batteries, such as Li–O2, are some of the most promising candidates for high-performance energy storage applications, however, their performance is still limited by the electrolyte instability.

Synthesis and overview of carbon-based materials for high performance energy storage application: A review

The vast seeking of energy and lacking of fossil fuels has concerned adequate attention of investigators to advance materials, including outstanding electrochemical characteristics. Carbon-based materials, for example, graphene, activated carbon, carbon nanotubes, have gained massively focus because of their essential electrical, thermal and mechanical characteristics. CNT and graphene are practicing a make of electrodes for energy storage applications. Carbon materials as anode materials have some limitations because charge storage is bound through adsorption-desorption of ions at the electrode/electrolyte interface, producing a double layer, and their collection while synthesis and processing result in lower electrochemical activity. Carbon nanomaterials with 3D and 2D structures, like CNT, GN, GN foams and carbon nanofibers, have been extensively published due to their distinct morphological and physical characteristics for energy storage purposes. This review article estimates and collects published data to exhibit an essential and comprehensive state of the art survey.

Green synthesis of nitrogen-doped hierarchical porous carbon nanosheets derived from polyvinyl chloride towards high-performance supercapacitor

Green and cost-efficient preparation of two-dimensional (2D) hierarchically porous carbon nanosheets for supercapacitors draw extensive attention due to their unique microstructure and excellent electrochemical performance. In the present work, polyvinyl chloride-derived nitrogen-doped hierarchically porous carbon nanosheet materials were successfully synthesized through a one-pot carbonization process, which contained in-situ generated CaCO 3 template and K 2 CO 3 activation agent coupled with the N-doping and blowing effect of melamine. The optimal carbon sample with nitrogen-doping presented unique 2D morphology, high specific surface area (2546.6 m 2 g −1 ), and micropore-dominant hierarchical pores. Benefiting from these merits, it delivered a high specific capacitance of 347.0 F g −1 at 0.5 A g −1 in 6 M KOH electrolyte in a three-electrode system. Furthermore, the assembled symmetric supercapacitor demonstrated an excellent energy density of 25.7 Wh kg −1 at a power density of 90.0 W kg −1 in 1 M Na 2 SO 4 electrolyte and superior cycling stability of 98.2% retention of initial capacitance after 5,000 cycles. Eventually, it is expected to provide an environmentally friendly and feasible method to obtain porous carbon electrode materials with 2D nanosheet structure for high-performance energy storage applications. • 2D porous carbon nanosheet materials are synthesized by one-pot pyrolysis. • In-situ generated CaCO 3 and K 2 CO 3 act as template and activation agent, respectively. • Blowing effect of melamine promotes the formation of 2D structures. • The material displays a high capacitance 347.0 F g −1 and excellent rate capability. • The symmetric supercapacitor shows a high energy density of 25.7 Wh kg −1 .

Gelatinization assisted synthesis of multi-heteroatoms enriched 3D honeycomb-like porous carbon for high-voltage supercapacitor device

Developing high-performance supercapacitors with low-cost electrode materials that possess high power energy while maintaining high specific energy is highly desirable and remains a major challenge. Herein, we report an N, S, P-multi-heteroatom co-doped three-dimensional (3D) honeycomb-like porous carbon nanosheets from garden cress seeds via facile two-step synthesis strategy involving gelatinization accompanied by KOH activation. The large specific surface area (1302.3 m2 g−1) and hierarchical porous structure has advantages of a well-balanced 3D interconnected micro-/meso‑/ and macropores for shorter ion pathway and provide rapid electrolyte penetration. When the as-obtained doped porous carbon is used as a supercapacitor electrode, it delivered high specific capacitance of 409 F g−1 and 279 F g−1 in aqueous three and two-electrode configuration, respectively. In addition, the device shows high cyclic stability of 93% even after 10,000 cycles. More importantly, the assembled symmetric supercapacitor device using 1 M tetraethylammonium tetrafluoroborate (TEABF4) as organic electrolyte (2.8 V) delivered outstanding specific energy of 31 Wh kg−1 (6.2 Wh L−1) at a specific power of 1300 W kg−1 (260 W L−1) and retained 25 Wh kg−1 even at a high specific power of 3000 W kg−1. Notably, the high voltage fabricated supercapacitor was able to power up various light-emitting diodes of voltage range from 1.8 to 3.8 V demonstrating its potential towards powering electronic devices. The strategy to employ cost-effective renewable garden cress seeds as biomass precursors to achieve hierarchical porous multi-heteroatom doped 3D carbon is of great interest for high-performance energy storage applications.

Bifunctional ZnO sphere/r-GO composites for supercapacitor and photocatalytic activity of organic dye degradation

Here in, ZnO sphere/r-GO composites was synthesized by a simple hydrothermal method. The morphological characterizations (FE-SEM and TEM) indicated the ZnO sphere covered by r-GO nanosheets. The formation of the prepared ZnO sphere/r-GO composites was investigated by XRD and FT-IR analytical techniques, respectively. The composite electrode material exhibited high specific capacitance of 293.5 F/g at the current density 1 A g−1 and also outstanding cyclic stability of 96% retained after 10,000 charge discharge (GCD) cycles at of 6 A g−1. The catalytic activity of ZnO sphere and ZnO sphere/r-GO composites shows the degradation percentage if 76.2 and 94.6%, respectively. ZnO sphere/r-GO composite shows around 24% of catalytic enhancement due to the high specific surface area of r-GO, and also the composite shows high reliability and degradation efficiency is still retained at 96.9% upto 5 cycles. The composite material is a potential candidate for high performance energy storage and photocatalytic applications.

Nitridation-induced in situ coupling of Ni-Co4N particles in nitrogen-doped carbon nanosheets for hybrid supercapacitors

The self-supported integrated structure of electrode consisting of heteroatoms is advantageous for high-performance energy storage applications. Herein, we developed heteroatomic Ni-Co4N nanoparticles laminated on highly conductive nitrogen-doped carbon (NC) matrix through in-situ nitridation for high energy and stable hybrid supercapacitor (HSC). The plenty of rendering electrochemically active sites, specifically, single-atom Ni, Co4N nanoparticles, and heteroatomic N-doped carbon matrix, and their several synergistic effects facilitate fast electron transfer and superior electrochemical performance. Benefiting from these merits, the resultant Ni-Co4N@NC electrode demonstrates robust electrochemical activity with high specific capacity of 397.5 mA h g−1, high rate capability of 72.4% and superior cycling stability over 10,000 cycles. The heteroatomic Ni-Co4N@NC electrode is further employed for the HSC cell beside with the activated carbon (AC) electrode, which establish the specific energy of 57.2 Wh kg−1 at a specific power of 843.8 W kg−1 and cyclic stability of 89.7% after 15,000 cycles. The present study highlights the utilization of heteroatomic self-supported metal nitrides for the high energy HSCs cell, paving the way to the expansion of highly efficient electrode materials for the future energy storage systems.

Design and fabrication of iron-doped nickel oxide-based flexible electrode for high-performance energy storage applications

In this study, we report on the synthesis of pristine and iron (Fe)-doped nickel oxide nanoparticles (NPs) using a precipitation method. The optical, magnetic, and supercapacitor properties of NPs were investigated via ultraviolet–visible absorption, vibrating sample magnetometer (VSM), and cyclic voltammetry (CV). The effect of Fe doping on the optical bandgap of NiO nanoparticles demonstrates that the bandgap increases with increasing doping concentration (x = 0.02 M, 0.04 M, and 0.06 M). The VSM exhibits ferromagnetic behavior at room temperature. Fe doped sample shows promising supercapacitor electrode material properties ensuring that NiO: Fe could act as an enhanced working electrode for the future generation of supercapacitors.

Seven steps to reliable cyclic voltammetry measurements for the determination of double layer capacitance

Discovery of electrocatalytic materials for high-performance energy conversion and storage applications relies on the adequate characterization of their intrinsic activity, which is currently hindered by the dearth of a protocol for consistent and precise determination of double layer capacitance (C DL). Herein, we propose a seven-step method that aims to determine C DL reliably by scan rate-dependent cyclic voltammetry considering aspects that strongly influence the outcome of the analysis, including (a) selection of a suitable measuring window, (b) the uncompensated resistance, (c) optimization of measuring settings, (d) data acquisition, (e) selection of data suitable for analysis, (f) extraction of the desired information, and (g) validation of the results. To illustrate the proposed method, two systems were studied: a resistor–capacitor electric circuit, and a glassy carbon disk in an electrochemical cell. With these studies, it is demonstrated that when any of the mentioned steps of the procedure are neglected, substantial deviations of the results are observed with misestimations as large as 61% in the case of the investigated electrochemical system. Moreover, we propose allometric regression as a more suitable model than linear regression for the determination of C DL for both the ideal and the non-ideal systems investigated. We stress the importance of assessing the accuracy of not only highly specialized electrochemical methods, but also of those that are well-known and commonly used as it is the case of the voltammetric methods. The procedure proposed herein is not limited to the determination of C DL, but can be effectively applied to any other analysis that aims to deliver quantitative results via voltammetric methods, which is crucial for the study of kinetic and diffusion phenomena in electrochemical systems.

Electrochemical synthesis of binder-free interconnected nanosheets of Mn-doped Co3O4 on Ni foam for high-performance electrochemical energy storage application

• Simple electrochemical CV method for the synthesis of different nanostructures by tuning the scan rate. • Binder free preparation of different nanostructures of Mn-doped Co 3 O 4 on Ni foam. • Superior electrochemical performance of interconnected nanosheets exhibiting maximum specific capacitance of 1005F g −1 in KOH. • Aqueous asymmetric supercapacitor assembly with activated carbon showed enhanced electrochemical performance. In this study, various nanostructures of Mn-doped Co 3 O 4 were synthesized on Ni foam using binder-free electrochemical technology for electrochemical energy storage applications. Using the cyclic voltammetry method with different scan rates, diverse nanostructures, i.e., irregularly oriented nanooctahedra, interconnected standing nanosheets, and nanopetals of Mn-doped Co 3 O 4 , were obtained. The standing interconnected nanosheets on the Ni foam exhibited remarkable supercapacitive performance due to the void space between the sheets and mesoporous structure, which provided additional active sites for faradic transitions. The nanosheets exhibited excellent electrochemical performance with a maximum specific capacitance of 1005F g −1 and a cyclic stability of 88% during 5000 charge–discharge cycles. Moreover, an asymmetric supercapacitor was assembled comprising activated carbon on Ni foam and interconnected nanosheets of Mn-doped Co 3 O 4 on Ni foam as negative and positive electrodes, respectively. This assembled device exhibited an improved potential of 1.6 V, a maximum specific energy of 20.6 Wh kg −1 , and a maximum specific power of 16 kW kg −1 with 80.6% capacity retention after 2000 charge–discharge cycles, which is superior for SC devices.

Multi-yolk ZnSe/2(CoSe2)@NC heterostructures confined in N-doped carbon shell for high-efficient sodium-ion storage

Transition metal selenides with low pollution, high chemical stability and high theoretical capacity are regarded as the most prospective candidate materials for sodium ions storage. However, its poor conductivity, drastic volume change and sluggish diffusion kinetics hinder potential commercialized practical applications. Herein, multi-yolk ZnSe/2(CoSe2) heterostructures confined in N-doped carbon (NC) hexahedron have been prepared via a facile two-step method. Benefiting from the novel multi-yolk-shell structure with heterojunction interfaces, ZnSe/2(CoSe2)@NC electrodes display superior sodium storage performance with superior cycling performance (specific capacity of 552.1 mAh g−1 over 100 cycles at 0.1 A g−1) and outstanding rate performance (specific capacity of 528.6 mAh g−1 at 5 A g−1) and long-term cycling stability. Our designed multi-yolk-shell ZnSe/2(CoSe2)@NC heterostructures can be envisaged to accelerate progress towards advanced alkali metal ion batteries with vast implications for commercialized high-performance energy-storage applications.

Printable Two-Dimensional V2O5/MXene Heterostructure Cathode for Lithium-Ion Battery

Two-dimensional nanosheets show promise as electrode materials for high electrochemical performance lithium-ion batteries owing to their unique properties. However, individual nanosheets cannot meet all the required properties for batteries in one material to achieve optimal performance. Here, we demonstrate a new type of two-dimensional heterostructure cathode material for lithium-ion batteries by inkjet printing a composite ink based on high capacity V2O5 nanosheets and high electronic conductivity Ti3C2Tx nanosheets. The excellent electronic conductivity of Ti3C2Tx nanosheets and layer-by-layer heterostructure design enable fast electron transport and minimization of detrimental volume changes during the electrochemical process, respectively. The printed cathodes exhibit a high capacity of 321 mAh g−1 at 1C, high-rate capability of 112 mAh g−1 at 10.5C and good cycling stability after 680 cycles with 91.8% capacity retention, indicating high electrochemical performance of the printed heterostructure cathode. This work opens new opportunities of two-dimensional heterostructures for high performance energy storage applications.

Ce-MOF derived ceria: Insights into the Na-ion storage mechanism as a high-rate performance anode material

Cerium-based metal–organic framework (Ce-MOF-808) derived CeOx/C (1≤x≤2) nanocomposite material is applied as an anode material for sodium-ion batteries. Cubic phase structure ceria within 5 nm of grain consisted nanocubes are predicted from physical and morphological studies. MOF template is converted into the carbon during the calcination process and promotes the metal oxide conductivity. The electrochemical performance of Ce-MOF-808-derived CeOx/C nanocomposites exhibit a sodium ion reversible discharge capacity of 446 mAh g−1 at a current density of 100 mA g−1 and sustains 256 mAh g−1 over 600 cycles. The capacity contribution behavior, kinetics performance and Na-ion storage electrochemical reaction mechanism are investigated through cyclic voltammetry, electrochemical impedance and ex-situ X-ray diffraction/X-ray photoelectron spectroscopy analyses. The contribution of highly stable pseudocapacitive nature and oxygen vacancies-based conversion of Ce reveal a remarkable cyclic and rate performance. Thus, this work provides in-depth analysis and utilization of MOF-derived metal oxide nanocomposite for high-performance energy storage applications.

Tuning the synergistic effects of MoS2and spinel NiFe2O4nanostructures for high performance energy storage and conversion applications

Energy storage and water splitting applications of MoS2/NiFe2O4nanocomposites are explored.

Cellulose nanofiber derived carbon aerogel with 3D multiscale pore architecture for high-performance supercapacitors.

Carbon materials are highly promising electrode materials for supercapacitors, due to their hierarchical porous structure and large specific surface area. However, the limited specific capacitance and inferior rate capability significantly prevent their practical application. Herein, 3D interconnected hierarchical porous carbon aerogels (CNFAs) through engineering the pyrolysis chemistry of CNF are developed. The obtained CNFAs effectively improve the carbon yield and suppress the volume shrinkage, as well as have robust mechanical properties. As a supercapacitor electrode, the CNFAs-17% electrode exhibits an ultrahigh capacitance of 440.29 F g-1 at 1 A g-1, significantly superior to most reported biomass-based carbon materials. Moreover, the CNFAs-17% assembled symmetric supercapacitor (SSC) achieves an outstanding rate capability (63.29% at 10 mA cm-2), high areal energy density (0.081 mWh cm-2), and remarkable cycling stability (nearly 100% capacitance retention after 7000 cycles). This work offers a simple, effective strategy towards the preparation of promising electrode materials for high-performance energy storage applications.

Constructing a hierarchically structured KNi0.67Co0.33PO4·H2O-graphene hydrogel/Ni foam electrode for superior all-solid-state supercapacitor.

A monolithic supercapacitor electrode of a KNi0.67Co0.33PO4·H2O-graphene composite hydrogel supported on Ni foam (KNCP-GH/NF) is first prepared by a one-step hydrothermal method, which achieves notable improvements in the electrode surface area and mass-loading of active materials. The KNCP-GH/NF electrode enjoys a hierarchical open-porous structure, where the KNCP-GH composite hydrogel fills in the voids in NF and the porous graphene hydrogel (GH) simultaneously provides a large support surface for growing active KNCP nanoflowers. Accordingly, the KNCP-GH/NF electrode exhibits a strikingly high capacity of 3240 mC cm-2 (876 C g-1) at 2 mA cm-2 and a satisfactory rate performance with 78.3% retention at 100 mA cm-2. Further, an all-solid-state asymmetric supercapacitor, constituted by using KNCP-GH/NF and Fe2P/GH/NF as the cathode and anode, respectively, and PVA-KOH as the solid-state gel electrolyte, delivers a high energy density of 69.2 W h kg-1 (3.9 mW h cm-3) and a power density of 13 229 W kg-1 (720 mW h cm-3) as well as notable cyclability with 81.2% capacity retention after 10 000 charge/discharge cycles. These attractive performances suggest a promising potential for a hierarchically structured KNCP-GH/NF electrode for the high-performance energy storage application.