Graphene-oxide-supported Pt nanoparticles with high activity and stability for hydrazine electro-oxidation in a strong acidic solution

Kim, Ji Dang; Choi, Myong Yong; Choi, Hyun Chul

doi:10.1016/j.apsusc.2017.05.222

Cited by 21 publications

(6 citation statements)

References 60 publications

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“…With the increase of oxidation degree of carbon supports, the half-wave potentials of Pt/LU-MWCNT and Pt/MU-MWUCNT increase to 0.90 and 0.915 V, respectively, which are much higher than that of commercial Pt/C (0.89 V), whereas a slight decrease of the half-wave potential to 0.87 V is observed for the high unzipped level sample as the decrease of ECSA mentioned above. In addition, the Tafel slopes of the catalysts were obtained from LSV polarization curves by plotting kinetic and mixed kinetic transport controlled region current densities against potential 62 (see Figure S4). For each sample, a typical values of 63 mV dec −1 can be identified at low current density values, indicating that the ORR pathway and rate-determining step are similar on different type of the carbon supported Pt catalysts investigated here.…”

Section: Resultsmentioning

confidence: 99%

Controllable Unzipping of Carbon Nanotubes as Advanced Pt Catalyst Supports for Oxygen Reduction

Shu

Xia

Wei

et al. 2019

ACS Appl. Energy Mater.

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Alternative carbon support materials provide great opportunities to fabricate advanced catalysts with enhanced activity and durability, especially for energy conversion and storage technologies based on the oxygen reduction reaction (ORR), such as fuel cells and metal−air batteries. In this work, a series of controllable unzipped carbon nanotubes (CNTs) have been successfully synthesized and used as Pt supports for highly efficient ORR catalysts. Benefiting from the unique structure constructed by the 1-D and 2-D nanomaterials, outstanding catalytic performance with enhanced Pt utilization, ORR activity, and durability is achieved for the catalyst of Pt loaded on the medium-level unzipped CNTs, with a remarkable halfwave potential of 0.915 V (vs RHE). The effective mass transport in the cathodes fabricated with the 3-D nanoarchitecture hybridized with CNTs and graphene ribbons catalyst supports results in a significant increase of peak power density for direct methanol fuel cells (DMFCs) compared to that of a traditional electrode with commercial Pt/C catalyst, which demonstrates a great application potential of this novel catalyst design.

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Section: Resultsmentioning

confidence: 99%

Controllable Unzipping of Carbon Nanotubes as Advanced Pt Catalyst Supports for Oxygen Reduction

Shu

Xia

Wei

et al. 2019

ACS Appl. Energy Mater.

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“…RuO 2 –CNT was prepared by dispersion of RuO 2 nanoparticles onto thiolated CNT surfaces; surface thiolation of CNTs was achieved by the reaction of sodium hydrosulfide (NaSH) with acid‐treated CNTs . Ruthenium (III) chloride (RuCl 3 , Ru content 45%) and hydrogen peroxide (H 2 O 2 ) were used as the metal precursor and reductant, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…However, there are few reports of RuO 2 nanoparticles as a photocatalyst, which may be attributed to their tendency to aggregate in reaction systems, due to their high surface energy . Several recent studies have demonstrated that the deposition of nanoparticles onto carbon supports offers great potential for decreasing the recombination rate of charge carriers and preventing the aggregation of nanoparticles . Therefore, we report herein on the preparation and photocatalytic properties of a RuO 2 –carbon nanotube (RuO 2 –CNT) nanocomposite, comprised of RuO 2 nanoparticles deposited onto a thiolated CNT substrate by wet chemical methods.…”

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confidence: 99%

Photocatalytic Degradation of Methylene Blue on RuO₂–CNT

Kim

Choi

2019

Bulletin Korean Chem Soc

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Photodegradation of organic pollutants by oxide-based photocatalysts has gained increasing attention as a solution to environmental problems. Generally, the degradation of pollutants proceeds by reaction with reactive hydroxyl radicals, which are generated by the reaction of water molecules adsorbed onto the photocatalyst with photogenerated charge carriers on the surface of the photocatalyst. 1,2 However, the fast recombination rate of photogenerated charge carriers limits the ability to enhance the photocatalytic efficiency of oxide-based photocatalysts. The difficulty of separating and recycling these catalysts also hinders their practical application.Ruthenium dioxide (RuO 2 ) has been used in a variety of applications, including energy storage devices, transparent electrodes, gas sensors, catalysts, and thin film resistors, due to its excellent electrical conductivity, good chemical stability, and high specific capacitance. [3][4][5] In photocatalysis, RuO 2 has generally served as a component of a composite photocatalyst such as RuO 2 /TiO 2 , RuO 2 /ZnO, and RuO 2 / Ag 3 PO 4, due to its good electron conductivity, which can significantly promote the separation efficiency of photogenerated charge carriers. 6-8 However, there are few reports of RuO 2 nanoparticles as a photocatalyst, which may be attributed to their tendency to aggregate in reaction systems, due to their high surface energy. 9,10 Several recent studies have demonstrated that the deposition of nanoparticles onto carbon supports offers great potential for decreasing the recombination rate of charge carriers and preventing the aggregation of nanoparticles. 11-13 Therefore, we report herein on the preparation and photocatalytic properties of a RuO 2 -carbon nanotube (RuO 2 -CNT) nanocomposite, comprised of RuO 2 nanoparticles deposited onto a thiolated CNT substrate by wet chemical methods. The RuO 2 -CNT nanocomposite was characterized by means of transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was investigated by photodegradation of methylene blue (MB). Figure 1(a) displays a typical TEM image of the RuO 2 -CNT nanocomposite and the corresponding size distribution histogram of the deposited nanoparticles. The TEM image clearly shows the presence of nanoparticles on the surface of the CNTs. No free nanoparticles are observed in the TEM image. The deposited nanoparticles have an average diameter of approximately 1 nm, with a narrow size distribution. As depicted in Figure 1(b), size-similar and quasi-spherical nanoparticles are uniformly dispersed along the CNT surfaces. The nanoparticles attached to CNTs could not be separated from them even after exhaustive washing and prolonged sonication. Figure 2(a) shows the XRD patterns for the thiolated CNTs and RuO 2 -CNT. The simulated pattern of RuO 2 (JCPDS card No. 43-1027) is shown for comparison with the experimental data. In RuO 2 -CNT, the two peaks at 26.0 and 43.2 can be indexed to the...

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“…Practical applications of DHFCs are mainly affected because of the slower kinetic and higher onset oxidation potential related to the direct electro-oxidation of hydrazine at unmodified electrodes [17,18]. Thus, noble-metal-based (Pt, Pd, Au, and Ag) transducers were extensively used as potential electro-catalysts in several typical hydrazine fuel cells; consequently, such fuel cells are expensive and challenging to fabricate for widespread commercial use [19][20][21][22][23][24][25]. Particularly, the Pt-or Pd-nanostructure-based electro-catalytic oxidation reaction of hydrazine displayed other cross-reactions, i.e., the oxidation of H 2 , as an alternative to the complete electro-oxidation of hydrazine [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Co Nanoparticle-Encapsulated Nitrogen-Doped Carbon Nanotubes as an Efficient and Robust Catalyst for Electro-Oxidation of Hydrazine

et al. 2021

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Structural engineering is an effective methodology for the tailoring of the quantities of active sites in nanostructured materials for fuel cell applications. In the present study, Co nanoparticles were incorporated into the network of 3D nitrogen-doped carbon tubes (Co@NCNTs) that were obtained via the molten-salt synthetic approach at 800 °C. Morphological representation reveals that the Co@NCNTs are encompassed with Co nanoparticles on the surface of the mesoporous walls of the carbon nanotubes, which offers a significant active surface area for electrochemical reactions. The CoNPs/NCNTs-1 (treated with CaCl2) nanomaterial was used as a potential candidate for the electro-oxidation of hydrazine, which improved the response of hydrazine (~8.5 mA) in 1.0 M NaOH, as compared with CoNPs/NCNTs-2 (treated without CaCl2), NCNTs, and the unmodified GCE. Furthermore, the integration of Co helps to improve the conductivity and promote the lower onset electro-oxidation potential (−0.58 V) toward the hydrazine electro-oxidation reaction. In particular, the CoNPs/NCNTs-1 catalysts showed significant catalytic activity and stability performances i.e., the i-t curves showed notable stability when compared with their initial current responses, even after 10 days, which indicates the significant durability of the catalyst materials. This work could present a new approach for the design of efficient electrode materials, which can be used as a favorable candidate for the electro-oxidation of liquid fuels in fuel cell applications.

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Graphene-oxide-supported Pt nanoparticles with high activity and stability for hydrazine electro-oxidation in a strong acidic solution

Cited by 21 publications

References 60 publications

Controllable Unzipping of Carbon Nanotubes as Advanced Pt Catalyst Supports for Oxygen Reduction

Controllable Unzipping of Carbon Nanotubes as Advanced Pt Catalyst Supports for Oxygen Reduction

Photocatalytic Degradation of Methylene Blue on RuO₂–CNT

Co Nanoparticle-Encapsulated Nitrogen-Doped Carbon Nanotubes as an Efficient and Robust Catalyst for Electro-Oxidation of Hydrazine

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Graphene-oxide-supported Pt nanoparticles with high activity and stability for hydrazine electro-oxidation in a strong acidic solution

Cited by 21 publications

References 60 publications

Controllable Unzipping of Carbon Nanotubes as Advanced Pt Catalyst Supports for Oxygen Reduction

Controllable Unzipping of Carbon Nanotubes as Advanced Pt Catalyst Supports for Oxygen Reduction

Photocatalytic Degradation of Methylene Blue on RuO2–CNT

Co Nanoparticle-Encapsulated Nitrogen-Doped Carbon Nanotubes as an Efficient and Robust Catalyst for Electro-Oxidation of Hydrazine

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Photocatalytic Degradation of Methylene Blue on RuO₂–CNT