True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

Small, Год журнала: 2020, Номер 16(37)

Опубликована: Авг. 6, 2020

The development of pseudocapacitive materials for energy-oriented applications has stimulated considerable interest in recent years due to their high energy-storing capacity with power outputs. Nevertheless, the utilization nanosized active batteries leads fast redox kinetics improved surface area and short diffusion pathways, which shifts electrochemical signatures from battery-like pseudocapacitive-like behavior. As a result, it becomes challenging distinguish "pseudocapacitive" "battery" materials. Such misconceptions have further impacted on final device configurations. This Review is an earnest effort clarify confusion between battery by providing true meanings correct performance metrics. A method battery-type using quantitative analysis outlined. Taking solid-state supercapacitors (SSCs, only polymer gel electrolytes) as example, distinction asymmetric hybrid discussed. state-of-the-art progress engineering summarized, will guide real-pseudocapacitive energy storage systems.

Язык: Английский

---

Metal oxide-based supercapacitors: progress and prospectives

Nanoscale Advances, Год журнала: 2019, Номер 1(12), С. 4644 - 4658

Опубликована: Янв. 1, 2019

We investigate the principal elements affecting properties of bimetallic oxide electrodes to reveal relevant energy storage mechanisms.

Язык: Английский

---

Transition metal oxide-based electrode materials for flexible supercapacitors: A review

Journal of Alloys and Compounds, Год журнала: 2020, Номер 857, С. 158281 - 158281

Опубликована: Дек. 11, 2020

Язык: Английский

---

NiCoP nanowire@NiCo-layered double hydroxides nanosheet heterostructure for flexible asymmetric supercapacitors

Chemical Engineering Journal, Год журнала: 2019, Номер 384, С. 123373 - 123373

Опубликована: Ноя. 4, 2019

Язык: Английский

---

Recent Advances of Asymmetric Supercapacitors

Advanced Materials Interfaces, Год журнала: 2020, Номер 8(1)

Опубликована: Ноя. 30, 2020

Abstract Asymmetric supercapacitors (ASCs) have attracted significant attentions worldwide owing to their wider voltage window compared with symmetric (SCs). Through combinations of two electrodes different charge storage mechanisms or redox reactions, extended operating can be realized for ASCs. In this article, first the ASCs are classified into types based on mechanisms: electric double‐layer capacitive (EDLC)//pseudocapacitive‐type and EDLC//battery‐type hybrid SCs. For EDLC/pseudocapacitive‐type ASC, carbon materials adopted as anode transition metal oxides including MnO 2 , RuO etc., utilized cathodes. SCs, combined oxide/hydroxide such NiO, Ni(OH) cathode. Recently, Li‐ion‐based composed Li‐ion battery‐type electrode a Li‐containing organic electrolyte show great potentials promising alternatives. Some oxides/nitrides InO Bi O 3 Fe 4 VN work in negative potential range. By coupling another battery/pseudocapacitive electrode, all redox‐type assembled electrochemical performances widely studied. Then, above categories recent advances summarized. Finally, challenges prospects development pointed out from perspectives study.

Язык: Английский

---

Template-assisted synthesis of hierarchically hollow C/NiCo2S4 nanospheres electrode for high performance supercapacitors

Chemical Engineering Journal, Год журнала: 2019, Номер 382, С. 122943 - 122943

Опубликована: Сен. 23, 2019

Язык: Английский

---

Carbon Cloth‐based Hybrid Materials as Flexible Electrochemical Supercapacitors

ChemElectroChem, Год журнала: 2019, Номер 6(23), С. 5771 - 5786

Опубликована: Сен. 23, 2019

Carbon cloths are the important materials composed of woven carbon fibres having diameters in range 5–10 μm. These have been investigated for innumerable applications such as supercapacitors (symmetric and asymmetric), batteries, solar cells, catalysis. They found to be best supports supercapacitive by providing high surface area, conductivity flexibility compared much widely used substrate Ni foam 1D Fe nanowires. High area enable ion diffusion cause decrease charge transfer resistance, resulting an increase specific capacitance electrodes. Several metal oxides, chalcogenides, phosphides, MXenes, nanotubes, graphene, conductive polymers incorporated into improve their energy storage activity. Further modification cloth via oxidation, doping growth different nanostructures is also helpful it increases electroactive necessary electrochemical interaction. The present review mainly focuses on development flexible using cloth-based materials. Such can further utilized uninterrupted steady power supply wearable portable electronic devices.

Язык: Английский

---

Recent Trends in Bimetallic Oxides and Their Composites as Electrode Materials for Supercapacitor Applications

ChemElectroChem, Год журнала: 2021, Номер 8(10), С. 1723 - 1746

Опубликована: Март 11, 2021

Abstract There is a growing interest in supercapacitors as energy storage systems due to their high specific power, fast charge/discharge rates, and long cycling stability. Researchers have focused recently on developing nanomaterials enhance the capacitive performance of supercapacitors. The inclusion electroactive components, such transition metal oxides (TMOs), carbon‐based materials, conducting polymers (CPs), believed play an important role improving electrochemical behavior electrode materials. Nevertheless, containing TMOs, CPs commonly suffer from inferior ion‐transport kinetics poor electronic conductivity, which can affect rate capability stability electrodes. Therefore, development TMO/CP TMO/carbon‐based materials has gained widespread attention because they synergistically combine advantages both enabling revolutionary applications field. In general, TMOs given good electrodes for by further increasing when two cations are introduced into single crystal structure. This Review describes highlights recent progress bimetallic regarding design approach, configurations, properties supercapacitor applications, at same time providing new opportunities future technologies.

Язык: Английский

---

Boosting the Energy Density of Flexible Solid-State Supercapacitors via Both Ternary NiV₂Se₄ and NiFe₂Se₄ Nanosheet Arrays

Chemistry of Materials, Год журнала: 2019, Номер 31(12), С. 4490 - 4504

Опубликована: Май 23, 2019

Because of the demand for sustainable energy storage devices, investigating high density and cost-effective electrodes flexible supercapacitors (SCs) is essential; however, emergence such high-performance to fulfill requirements industrial sectors remains a highly challenging task. Herein, we successfully demonstrated preparation ternary metal selenides nickel–vanadium selenide (NixV3–xSe4) nickel–iron (NixFe3–xSe4) series by simple low-cost hydrothermal method, followed selenization asymmetric SC (ASC). The impacts Ni2+ are studied shown lead significant enhancement in electrochemical properties, which varied with stoichiometric ratio Ni–V/Fe NixV3–xSe4 NixFe3–xSe4 nanosheet arrays. optimized NiV2Se4 NiFe2Se4 displayed specific capacities (∼329 261 mA h g–1, respectively, at 1 cm–2), excellent rate performances (capacity retentions about 79.33 77.78%, even 50 outstanding cycling stabilities (98.6 97.9% capacity after 10 000 cycles, respectively). Most notably, NiV2Se4//NiFe2Se4 ASC provides an 73.5 W kg–1 power 0.733 kW superior performance (96.6% retention cycles). nanostructured ASCs show promise portable electronics zero-emission transportation.

Язык: Английский

---

A review on synergy of transition metal oxide nanostructured materials: Effective and coherent choice for supercapacitor electrodes

Journal of Energy Storage, Год журнала: 2022, Номер 55, С. 105692 - 105692

Опубликована: Сен. 23, 2022

Язык: Английский

---