Textural and Capacitive Characteristics of Hydrothermally Derived RuO<sub>2</sub>×xH<sub>2</sub>O Nanocrystallites: Independent Control of Crystal Size and Water Content.

Chang, Kuo‐Hsin; Hu, Chi‐Chang; Chou, Chih-Yin

doi:10.1002/chin.200727008

Cited by 13 publications

(16 citation statements)

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“…Furthermore, transforming bulk transition metal oxides into nanoporous structures has been proposed to have the advantage of effectively alleviating the strain generated during the ion insertion/desertion process and leading to improved cycling charge/discharge performance [2,3]. Among such oxides, NiO is of particular interest owing to its high theoretical specific capacitance of 2573 F/g [22,23], high chemical/thermal stability, ready availability, environmentally benign nature and lower cost as compared to the state-of-the-art supercapacitor material RuO 2 [24,25]. There have been a variety of reports of the synthesis of different NiO nanostructures including porous nano/microspheres [26], nanoflowers [27], nanosheets [28], and nanofibers [29].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

et al. 2010

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We report a facile way to grow various porous NiO nanostructures including nanoslices, nanoplates, and nanocolumns, which show a structure-dependence in their specific charge capacitances. The formation of controllable porosity is due to the dehydration and re-crystallization of β-Ni(OH) 2 nanoplates synthesized by a hydrothermal process. Thermogravimetric analysis shows that the decomposition temperature of the β-Ni(OH) 2 nanostructures is related to their morphology. In electrochemical tests, the porous NiO nanostructures show stable cycling performance with retention of specific capacitance over 1000 cycles. Interestingly, the formation of nanocolumns by the stacking of β-Ni(OH) 2 nanoslices/plates favors the creation of small pores in the NiO nanocrystals obtained after annealing, and the surface area is over five times larger than that of NiO nanoslices and nanoplates. Consequently, the specific capacitance of the porous NiO nanocolumns (390 F/g) is significantly higher than that of the nanoslices (176 F/g) or nanoplates (285 F/g) at a discharge current of 5 A/g. This approach provides a clear illustration of the process-structure-property relationship in nanocrystal synthesis and potentially offers strategies to enhance the performance of supercapacitor electrodes.

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Section: Introductionmentioning

confidence: 99%

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

et al. 2010

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“…However, most of these works are based on reduced graphene oxide (r-GO) as precursors. The electrochemical properties are much poorer compared with transitional metal oxides and hydroxides 6 27 28 . The reason is the serious aggregation problems of r-GO, which cannot disperse PANi homogeneously onto the surface of graphene with tight interfacial combinations.…”

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confidence: 99%

Hydrothermal synthesis of nanostructured graphene/polyaniline composites as high-capacitance electrode materials for supercapacitors

Wang

Han

Zhao

et al. 2017

Sci Rep

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As known to all, hydrothermal synthesis is a powerful technique for preparing inorganic and organic materials or composites with different architectures. In this reports, by controlling hydrothermal conditions, nanostructured polyaniline (PANi) in different morphologies were composited with graphene sheets (GNS) and used as electrode materials of supercapacitors. Specifically, ultrathin PANi layers with total thickness of 10–20 nm are uniformly composited with GNS by a two-step hydrothermal-assistant chemical oxidation polymerization process; while PANi nanofibers with diameter of 50~100 nm are obtained by a one-step direct hydrothermal process. Benefitting from the ultrathin layer and porous structure, the sheet-like GNS/PANi composites can deliver specific capacitances of 532.3 to 304.9 F/g at scan rates of 2 to 50 mV/s. And also, this active material showed very good stability with capacitance retention as high as ~99.6% at scan rate of 50 mV/s, indicating a great potential for using in supercapacitors. Furthermore, the effects of hydrothermal temperatures on the electrochemical performances were systematically studied and discussed.

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“…The standard patterns of 1a, it can be seen that the samples from the hydrothermal process clearly show poor crystallinity, although crystallites in the sub-nanometer scale should be formed. 44 These samples after adopting the calcination treatment reveal improved crystallinity through their well-defined diffractions peaks from a comparison of all X-ray diffraction (XRD) patterns in Figure 1a. Note that the (110), (101), and (211) peaks of all binary (Ru−Sn)O 2 catalysts are located between the peaks corresponding to pure RuO 2 and SnO 2 .…”

Section: Resultsmentioning

confidence: 99%

Designing Binary Ru–Sn Oxides with Optimized Performances for the Air Electrode of Rechargeable Zinc–Air Batteries

You

2018

ACS Appl. Mater. Interfaces

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Because of the sluggish kinetics of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), binary ruthenium-tin oxides synthesized by a hydrothermal method with postannealing at 450 °C for 2 h are first proposed as bifunctional catalysts for these two reactions on the air electrode of rechargeable zinc-air batteries. The binary Ru-Sn oxides in various compositions show the typical oxide solid solution in the rutile phase. Among all binary Ru-Sn oxides, RuSn73 (70 atom % RuO and 30 atom % SnO) and RuSn37 (30 atom % RuO and 70 atom % SnO) show the highest catalytic activities toward the OER and ORR, respectively. Consequently, a novel design of the air electrode consisting of a RuSn37 coating on the carbon paper and a Ti mesh coated with RuSn73 (denoted RuSn(37-C|73-Ti)) is proposed to possess the optimal charge-discharge performances. A unique cell employing such an air electrode has been demonstrated to exhibit a very low charge-discharge cell voltage gap of 0.75 V at 10 mA cm. This cell with a peak power density of 120 mW cm at the current density of 235 mA cm also shows an outstanding charge-discharge stability over 80 h. This cell also exhibits an exceptionally high charge rate capability at 150 mA cm with a low charging voltage of 2.0 V.

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Textural and Capacitive Characteristics of Hydrothermally Derived RuO₂×xH₂O Nanocrystallites: Independent Control of Crystal Size and Water Content.

Cited by 13 publications

References 1 publication

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

Hydrothermal synthesis of nanostructured graphene/polyaniline composites as high-capacitance electrode materials for supercapacitors

Designing Binary Ru–Sn Oxides with Optimized Performances for the Air Electrode of Rechargeable Zinc–Air Batteries

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Textural and Capacitive Characteristics of Hydrothermally Derived RuO2×xH2O Nanocrystallites: Independent Control of Crystal Size and Water Content.

Cited by 13 publications

References 1 publication

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

Hydrothermal synthesis of nanostructured graphene/polyaniline composites as high-capacitance electrode materials for supercapacitors

Designing Binary Ru–Sn Oxides with Optimized Performances for the Air Electrode of Rechargeable Zinc–Air Batteries

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Textural and Capacitive Characteristics of Hydrothermally Derived RuO₂×xH₂O Nanocrystallites: Independent Control of Crystal Size and Water Content.