Free-standing transition metal oxide electrode architectures for electrochemical energy storage

Spencer, Michael A.; Augustyn, Veronica

doi:10.1007/s10853-019-03823-y

Cited by 23 publications

(11 citation statements)

References 149 publications

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“…Metal oxides are interesting inorganic compounds that have variable oxidation states that are dependent on the metal’s valency. Even a metal oxide with a particular oxidation state can exist in various crystallographic phases. − Variety of applications of metal oxides have already been explored in nanomaterials systems (nanoparticles, nanowires, and thin films) such as dielectric barriers in field-effect transistors; in magnetic tunnel junctions; in dilute magnetic semiconductors; in energy harvesting; in light-emitting diodes, photosensing, humidity sensing, and molecular sensing; and in energy generation and storage; as well as in visible or UV catalysis, depending on its band gaps. − Moreover, low loss dielectrics are good for microwave communication applications. In industrial machine components and in miniaturized devices, metal oxide can be used as an antioxidation and anticorrosion coating. − With the ever-changing technological needs of miniaturized devices and sensors, the need for exploring two-dimensional phases of metal oxides (2DMOs) is timely and urgent.…”

Section: Introductionmentioning

confidence: 99%

Microwave Synthesis of Hematene and Other Two-Dimensional Oxides

Chahal

Kauzlarich

Kumar

2021

ACS Materials Lett.

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With the emergence of graphene, the first two-dimensional (2D) material, many other 2D materials have been discovered and examined for novel applications. Various synthesis approaches have been employed for 2D Xenes, nitrides, carbide, and oxides to obtain high-quality and large-quantity production. Among them, 2D oxides have gained researcher’s attention for their magnetic, electronic, and catalytic properties. In this Article, we report single-step and scalable synthesis of hematene (a 2D atomic layer of iron oxide (Fe2O3)) and 2D metal oxides (2DMOs), e.g., chromium oxide, copper oxide, etc., by following a similar synthesis protocol. Metal chlorides dispersed in dimethylformamide (DMF) solvent immediately convert to the corresponding metal oxides upon microwave irradiation. Direct microwave solid-phase synthesis has also been explored and compared with liquid-phase microwave synthesis of hematene. Crystallographic structures of synthesized hematene were obtained by high-resolution transmission electron microscopy (HRTEM) and chemical identification was done by X-ray photoelectron (XPS) and Raman spectroscopy. In addition, magnetic measurements reveal the room-temperature ferromagnetic ordering of hematene with a saturation magnetization of 0.24 emu/g (at 300 K) and 1.08 emu/g (at 60 K). Field-cooled and zero-field cooled measurements clearly demonstrate a high Curie temperature of ∼376 K. Versatility of the synthesis technique has been demonstrated by employing the same protocol to the successful synthesis of a variety of metal oxides. This synthesis route permits a simple, inexpensive, efficient, and scalable production of 2DMOs.

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Section: Introductionmentioning

confidence: 99%

Microwave Synthesis of Hematene and Other Two-Dimensional Oxides

Chahal

Kauzlarich

Kumar

2021

ACS Materials Lett.

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“…Other studies have shown the possibility to completely eliminate CCs by fabricating free-standing electrodes (FSEs). 31,42,[47][48][49][50][51][52][53] These systems have previously been produced using a variety of active materials and manufacturing methods, including slurry-casting on glass, 54 highpressure/high-temperature filtration, 47,55 and 3D printing. 52,56 Unfortunately, most of these FSEs suffer from low specific capacities due to poor accessibility of active materials or insufficient electronic conductivities through the scaffolding matrix.…”

Section: Introductionmentioning

confidence: 99%

Camphene-Assisted Fabrication of Free-Standing Lithium-Ion Battery Electrode Composites

Weeks

Lauro

Burrow

et al. 2022

Preprint

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Continually increasing technological demands and widespread adoption of electric vehicles has spurred significant motivation to improve the performance of lithium-ion batteries (LIBs). In addition to improving intrinsic battery chemistry, optimizing electrode morphology and cell design can unlock increased energy density and rate capability to enable the adoption of next generation LIBs for societal decarbonization. Although free-standing electrode (FSE) architectures hold the potential to dramatically increase the gravimetric and volumetric energy density of LIBs by eliminating the parasitic dead weight and volume associated with traditional metal foil current collectors, current FSE fabrication methods suffer from insufficient mechanical stability, electrochemical performance, or industrial adaptability. Here, we demonstrate a scalable camphene-assisted fabrication method that allows simultaneous casting and templating of FSEs comprised of common LIB materials with performance superior to foil-cast counterparts. These porous, lightweight, and robust electrodes simultaneously enable enhanced rate performance by improving mass and ion transport within the percolating conductive carbon pore network and eliminating current collectors for efficient and stable Li+ storage (> 1000 cycle in half-cells) at increased gravimetric and areal energy densities. Compared to conventional foil-cast counterparts, the camphene-derived electrodes exhibit ~1.5x enhanced gravimetric energy density, increased rate capability, and improved capacity retention in coin-cell configurations. A full cell with freestanding anode and cathode cycled for over 250 cycles with greater than 80% capacity retention at an areal capacity of 0.73 mAh/cm2 . This active-material-agnostic electrode fabrication method holds the potential to tailor the morphology of flexible, current-collector-free electrodes to optimize LIBs for high power or high energy density Li+ storage and is applicable to other electrochemical technologies and advanced manufacturing methods

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“…[1][2][3][4] Among various energy conversion technologies, watersplitting plays a vital role in sustainable energy systems. [3,5,6] Thus, there has been a growing interest in searching for cost-effective methods for the watersplitting process. [7][8][9] However, the oxygen evolution reaction (OER) step of the water-splitting requires more energy demand with great over-potential and sluggish reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…[33,34] Both of the manganese oxide structures contain Mn atoms in different oxidation so that they can be facilitated in diverse fields such as energy storage, catalytic oxidation and hydrogenation, and ion exchange. [5,6] In addition, various methods such as metal doping, morphology control and surface modification have been investigated for both polymorphs to increase their catalytic activity. [35][36][37] Thus, designing or synthesizing Cryptomelane and Birnessite polymorphs with satisfactory hybrid structures and characteristics revealing the desired target catalytic activity is an attractive research field of crystal engineering.…”

Section: Introductionmentioning

confidence: 99%

Cryptomelane nanorods coated with Ni ion doped Birnessite polymorphs as bifunctional efficient catalyst for the oxygen evolution reaction and degradation of organic contaminants

Gürbüz

Elmacı

Zhang

et al. 2021

Applied Organom Chemis

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The intelligent design or development of dual‐functional catalysts using non‐precious metals especially for the oxygen evolution reaction (OER) in sustainable energy systems and degradation of organic pollutants is still a difficult and a significant challenge. Furthermore, the development of these catalysts is of great importance in terms of energy security and solution of the environmental problems. To meet these requirements, herein, we describe the synthesis of a Ni‐ion doped Birnessite@Cryptomelane (Ni2+/B@Cr) hybrid structure as a bifunctional efficient catalyst for the OER in neutral media and degradation of dye pollutants. The Ni2+/B@Cr catalyst exhibited a sharp onset potential at 390 mV (vs. RHE) and achieved a current density of 1 mA cm−2 at a low ƞ of 430 mV with a Tafel slope of ~96 mV dec−1. The results of electrochemical impedance spectroscopy (EIS) studies indicated that Ni intercalation into birnessite layer and heterostructure of the hybrid electrocatalyst Ni2+/B@Cr increased the conductivity by lowering the resistance of charge transfer (Rct = 4.82 Ω) and oxygen evolution processes (ROER = 4.13 Ω). The durability assay identified Ni2+/B@Cr as stable electrocatalyst with 10% loss of activity after long‐term stability tests (10 h, under 500‐mV overpotential). In addition, the Ni2+/B@Cr achieved high (86.67 s−1 g−1) and rapid (173 s) catalytic performance for the reduction of methylene blue (MB). Overall, this paper presents a low‐cost production strategy for the design of highly efficient bifunctional catalysts, offering boosted electrocatalytic and degradation performance for water oxidation and organic dye contamination, respectively.

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Free-standing transition metal oxide electrode architectures for electrochemical energy storage

Cited by 23 publications

References 149 publications

Microwave Synthesis of Hematene and Other Two-Dimensional Oxides

Microwave Synthesis of Hematene and Other Two-Dimensional Oxides

Camphene-Assisted Fabrication of Free-Standing Lithium-Ion Battery Electrode Composites

Cryptomelane nanorods coated with Ni ion doped Birnessite polymorphs as bifunctional efficient catalyst for the oxygen evolution reaction and degradation of organic contaminants

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