Redox‐Mediator‐Enhanced Electrochemical Capacitors: Recent Advances and Future Perspectives

Hu, Lintong; Zhai, Tianyou; Li, Huiqiao; Wang, Yangang

doi:10.1002/cssc.201802450

Cited by 72 publications

(56 citation statements)

References 117 publications

(344 reference statements)

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“…The same procedure was also applied on the Ni 3 (NO 3 ) 2 (OH) 4 nanosheets‐coated nickel foam to produce NiSe nanosheets with larger thicknesses. The mass of the activated material on NF was calculated according to previous reports …”

Section: Methodsmentioning

confidence: 99%

“…Hybrid supercapacitors (HSCs), employing battery‐type electrode materials as the positive electrode and carbon‐based materials as the negative electrode, have exhibited both high power densities and energy densities . Because the battery‐type electrode materials play a key role in determining the performance of HSCs, significant efforts have been devoted to developing diverse battery‐type electrode materials . Transition metal (TM) oxides/hydroxides, such as Ni(OH) 2 , MnO 2 , and FeCo 2 O 4 nanowire arrays, have been extensively investigated in the past decades.…”

Section: Introductionmentioning

confidence: 99%

“…[7] Because the batterytype electrode materials play akey role in determining the performance of HSCs, [8] significant efforts have been devoted to developing diverseb attery-type electrode materials. [9] Transition metal (TM) oxides/hydroxides, such as Ni(OH) 2 , [5,10] MnO 2 , [11] and FeCo 2 O 4 nanowire arrays, [12] have been extensively investigated in the past decades. However,t heir relatively low electricalc onductivity,i nsufficient number of active sites, and unsatisfactory capacity and rate performance have limited their real-lifea pplication potentialfor HSCs.…”

Section: Introductionmentioning

confidence: 99%

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Porous Ultrathin NiSe Nanosheet Networks on Nickel Foam for High‐Performance Hybrid Supercapacitors

Zhao

et al. 2019

ChemSusChem

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Transition metal selenides (TMSs) with excellent electrochemical activity and high intrinsic electrical conductivity have attracted considerable attention owing to their potential use in energy storage devices. However, the low energy densities of the reported TMSs, which originate from the small active surface area and poor electrolyte ion mobility, substantially restrict their application potential. In this work, porous ultrathin nickel selenide nanosheet networks (NiSe NNs) on nickel foam are fabricated by using a novel, facile method, that is, selenylation/pickling of the pre‐formed manganese‐doped α‐Ni(OH)2. Removal of Mn resulted in NNs with a highly porous structure. The 3D framework of the NNs and the inherent nature of the NiSe affords high ion mobility, abundant accessible activated sites, vigorous electrochemical activity, and low resistance. One of the highest specific capacities of TMSs ever reported, that is, 443 mA h g−1 (807 μAh cm−2) at 3.0 A g−1, is achieved with the NNs as electrodes. The assembled NiSe NNs//porous carbon hybrid supercapacitor delivers a high energy density of 66.6 Wh kg−1 at a power density of 425 W kg−1, with excellent cycling stability. This work provides a new strategy for the production of novel electrode materials that can be applied in high‐performance hybrid supercapacitors, and a fresh pathway towards commercial applications of hybrid supercapacitors based on TMS electrodes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Porous Ultrathin NiSe Nanosheet Networks on Nickel Foam for High‐Performance Hybrid Supercapacitors

Zhao

et al. 2019

ChemSusChem

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“…One promising approach comes from the family of hybrid metal-ion SCs (Li + , [95,96] Na + , [97] K + , [57] and even Al 3+ [98] ), which exhibits remarkable energy storage. [100] The development of flexible solidstate SCs [101] and printed and fiber-shaped supercapacitors with desirable size and morphology [102][103][104] constitute major steps toward the integration of SCs into wearable and flexible (micro) electronic devices following the needs of the technology market. Another promising approach involves switching from the classic design of SCs as static systems to the concept of "electrochemical flow SCs" by employing flowable electrodes, which provide new opportunities for scalability, high power density, and long lifetime.…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

Blay

Galian

Mureşan

et al. 2020

Advanced Sustainable Systems

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structure was found for the first time in a mineral composed by CaTiO 3 in 1839. Since then, multiple metal oxide perovskites (AMO 3 ) were developed, which have interesting properties for ferroelectric, superconductive, and pyroelectric applications. Metal halide perovskites (X is a halide anion such as Cl − , Br − , or I − ), which were developed later, display promising semiconducting properties. In particular, lead halide perovskites (APbX 3 ) are the most widely studied perovskite composition and are classified according to the A cation into hybrid perovskites (methylammonium bromide, MA or formamidinium, FA) and all-inorganic perovskites (cesium, Cs). [2] The electronic properties of the perovskites are related to the M-X bond, while the size of the A cation can introduce crystal distortion and change the symmetry of the ideal cubic crystal structure. [3] Interestingly, by using a large A organic cation, low-dimensional halide perovskites can be formed, including 2D sheets, 1D chains, or 0D clusters. [4] Lead halide perovskites are revolutionizing photovoltaic technology thank to their outstanding optical and electronic properties, low cost, and simple preparation. Compared to silicon-based technology, perovskites are prepared from more abundant and low-cost precursors. The superior performance and high efficiency of perovskite-based solar cells (PSC) are due to i) high optical absorption coefficient, ii) long carrier diffusion length This article delineates the state of the art for several materials used in the harvest, conversion, and storage of energy, and analyzes the challenges to be overcome in the decade ahead for them to reach the market and benefit society. The materials covered have had a special interest in recent years and include perovskites, materials for batteries and supercapacitors, graphene, and materials for hydrogen production and storage. Looking at the common challenges for these different systems, scientists in basic research should carefully consider commercial requirements when designing new materials. These include cost and ease of synthesis, abundance of precursors, recyclability of spent devices, toxicity, and stability. Improvements in these areas deserve more attention, as they can help bridge the gap for these technologies and facilitate the creation of partnerships between academia and industry. These improvements should be pursued in parallel with the design of novel compositions, nanostructures, and devices, which have led most interest during the past decade. Research groups are encouraged to adopt a cross-disciplinary mindset, which may allow more efficient use of existing knowledge and facilitate breakthrough innovation in both basic and applied research of energy-related materials.

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“…An emerging class of supercapacitors ‐ namely redox electrochemical capacitor (REC) – are of particular interest . RECs provide enhanced energy density, effectual power delivery, and have a construction that is akin to a normal aqueous SC .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Charge Storage Behavior in Redox‐electrolyte Based Battery‐like‐systems: A Case Study on Zr‐doped Ceria

2020

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Redox-additives are used as a cost-effective means to improve low-temperature charge-storage capacity for aqueous-supercapacitors. From a technology-development standpoint, there are challenges associated with a lack of standard techniques to measure the redox-additive based device-parameters. This, in turn, yields a relatively poor understanding of the chargestorage processes, especially in battery-like supercapacitors. With this as a backdrop, this work undertakes an analysis of Ce 0.9 Zr 0.1 O 2 @Ni-foam/KOH-K 3 Fe(CN) 6 electrode/electrolyte system. Here, a method is presented that enables the delineation of the contribution of the effective-mass of the redox-additive on the electrode-surface. This method demonstrates that the effective electrolyte-mass has a ∼ 38.5 to ∼ 15% contribution toward charge-storage with increasing scan rates (1 to 80 mV s À 1 ). The diffusion-controlled trends are duly analyzed using the well-established Trasatti analysis; these also serve as a reasonable benchmark for the method reported here. Hence the method is expected to be of use for other hybridsupercapacitor systems as well.

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Redox‐Mediator‐Enhanced Electrochemical Capacitors: Recent Advances and Future Perspectives

Cited by 72 publications

References 117 publications

Porous Ultrathin NiSe Nanosheet Networks on Nickel Foam for High‐Performance Hybrid Supercapacitors

Porous Ultrathin NiSe Nanosheet Networks on Nickel Foam for High‐Performance Hybrid Supercapacitors

Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

Analysis of Charge Storage Behavior in Redox‐electrolyte Based Battery‐like‐systems: A Case Study on Zr‐doped Ceria

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