Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

Septiani, Ni Luh Wulan; Kaneti, Yusuf Valentino; Guo, Yanna; Yuliarto, Brian; Jiang, Xuchuan; Ide, Yusuke; Nugraha, Nugraha; Dipojono, Hermawan Kresno; Yu, Aibing; Sugahara, Yoshiyuki; Golberg, Dmitri; Yamauchi, Yusuke

doi:10.1002/cssc.201901364

Cited by 118 publications

(86 citation statements)

References 70 publications

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“…This feature of α -MoO 3 offers the easiness to produce 2D morphologies, including a thin layer via the exfoliation process. The 2D material itself is considered a promising class of materials due to its unique properties, the high surface area that provide a huge number of active sites, and the possibility for surface modification as needed [ 71 , 72 ]. As sensitive materials for gas sensors, increasing its affinity to target gas combine with the high surface area leads to superior gas sensor performance.…”

Section: Molybdenum Oxide (Moo 3 ) Gas Sensing Materialsmentioning

confidence: 99%

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

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Molybdenum-based materials have been intensively investigated for high-performance gas sensor applications. Particularly, molybdenum oxides and dichalcogenides nanostructures have been widely examined due to their tunable structural and physicochemical properties that meet sensor requirements. These materials have good durability, are naturally abundant, low cost, and have facile preparation, allowing scalable fabrication to fulfill the growing demand of susceptible sensor devices. Significant advances have been made in recent decades to design and fabricate various molybdenum oxides- and dichalcogenides-based sensing materials, though it is still challenging to achieve high performances. Therefore, many experimental and theoretical investigations have been devoted to exploring suitable approaches which can significantly enhance their gas sensing properties. This review comprehensively examines recent advanced strategies to improve the nanostructured molybdenum-based material performance for detecting harmful pollutants, dangerous gases, or even exhaled breath monitoring. The summary and future challenges to advance their gas sensing performances will also be presented.

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Section: Molybdenum Oxide (Moo 3 ) Gas Sensing Materialsmentioning

confidence: 99%

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

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“…In this succession, Septiani et al prepared two-dimensional Fe-doped NiCo-layer double hydroxides by employing hydrothermal process to get highly porous nanosheets that enables ease transportation of ions charge mobility. 42 Again, Huang et al reported inorganic Zn-Ni hydroxides nanosheets (~10 nm) arrays for battery supecapacitor. 43 Further, Elgendy et al utilized SILAR synthesis technique to prepare binder-free mesoporous Ni-Zn-Fe, which was grown on NF substrate for high-performance electrode.…”

Section: Introductionmentioning

confidence: 99%

Miniaturization of transition metal hydroxides to hydroxide dots: A direction to realize giant cyclic stability and electrochemical performance

2021

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Binary metal hydroxides have tailored to quantum size in situ by manipulating the solvent medium in the co-precipitation process. Bimetallic cobalt-nickel hydroxide dots reveal hydrotalcite structure, and the mean hydrodynamic diameter is restricted to 2.5 nm when Co:Ni molar ratio 1:1. The bandgap values obtain around 2.64 eV using Tauc relation, which is within the quantum confinement region. The fitting results of X-ray photoelectron spectroscopy suggested the presence of redox couple Co 2+ , Co 3+ , Ni 2+ , and Ni 3+ in the hydroxides dots, which facilitates more electroactive sites. Again, excellent stability of hydroxide dots in solvent medium obtained by measuring T2 relaxation time. The binary dots electrode exhibits excellent pseudocapacitance performance with specific capacitance of 1926 F g À1 (221 mAh g À1 ) at 1 A g À1 with outstanding cycling retention of ~96% up to 20 000 cycles. Parallelly, an asymmetric supercapacitor device has been assembled by monitoring different mass loading of active material as +Ve and carbon black as ÀVe electrode cells. The ASC device utilizes to brighten a commercial LED to validate the electrode. Also, the specific capacitance of the ASC device has been calculated about 250 F g À1 (353 mAh g À1 ) with a holding energy density of 85 W h kg À1 .

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“…These attractive features enhance more exposed active sites and mass or ion transport, which are useful for improving the electrocatalytic activity, which clearly drives them as alternative materials to catalyze the oxidation of methanol. In addition, the development of surface porosity in nanosheets enhances the diffusion of ionic reagents, and the rise of unsaturated coordination sites can be accomplished [25].…”

Section: Introductionmentioning

confidence: 99%

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

et al. 2021

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Layered double hydroxides (LDHs) have emerged as promising electrodes materials for the methanol oxidation reaction. Here, we report on the preparation of different LDHs with the hydrothermal process. The effect of the divalent cation (i.e., Ni, Co, and Zn) on the electrochemical performance of methanol oxidation was investigated. Moreover, nanocomposites of LDHs and carbon xerogels (CX) supported on nickel foam (NF) substrate were prepared to investigate the role of carbon xerogel. The results show that NiFe-LDH/CX/NF is an efficient electrocatalyst for methanol oxidation with a current density that reaches 400 mA·m−2 compared to 250 and 90 mA·cm−2 for NiFe-LDH/NF and NF, respectively. In addition, all LDH/CX/NF nanocomposites show excellent stability for methanol oxidation. A clear relationship is observed between the electrodes crystallite size and their activity to methanol oxidation. The smaller the crystallite size, the higher the current density delivered. Additionally, the presence of carbon xerogel in the nanocomposites offer 3D interconnected micro/mesopores, which facilitate both mass and electron transport.

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Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

Cited by 118 publications

References 70 publications

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Miniaturization of transition metal hydroxides to hydroxide dots: A direction to realize giant cyclic stability and electrochemical performance

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

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