Nanocomposites for Oxygen Reduction Reaction and Supercapacitor Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 14756

Special Issue Editor

Dr. Daehwan Park
E-Mail Website
Guest Editor
1. Department of Engineering Chemistry, College of Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
2. Department of Industrial Cosmetic Science, College of Bio-Health University System, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
3. Department of Synchrotron Radiation Science and Technology, College of Bio-Health University System, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
4. LANG SCIENCE Inc., Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
Interests: 2D materials; nanohybrid and nanoporous materials; layered double hydroxide; electrocatalyst; CO2 capture and conversion; hydrogen production and fuel cell; biomedical and drug delivery system
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Special Issue Information

Dear Colleagues,

The development of sustainable and efficient energy system based on nanomaterials and nanocomposites is one of the most crucial challenges to meet renewable energy demand and climate change response. During the past few decades, numerous research on energy conversion and storage technologies including supercapacitors, future batteries, fuel cells, and water splitting system has been reported based on mechanism of photo- or electrochemical reactions especially such as oxygen reduction/evolution and hydrogen evolution reactions. This special issue covers the significance of advanced nanomaterials and nanocomposites for sustainable energy conversion and storage technologies related with oxygen reduction reaction and supercapacitor, including, but not limited to:

  • energy storage and conversion
  • nanomaterials synthesis and characterizations
  • nanocomposites fabrication for energy devices
  • photochemistry and electrochemisty
  • water splitting
  • oxygen reduction reaction and oxygen evolution reaction
  • supercapacitor and battery
  • hydrogen production and fuel cell technologies
  • CO2 capture and reduction for further utilization
  • carbon and nanohybrid materials for renewable energy and sustainability
  • nanocatalyst and catalysis for climate change-response technology

Dr. Daehwan Park
Guest Editor

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Keywords

  • nanomaterials and nanocomposites for energy storage and conversion
  • water splitting and hydrogen production
  • oxygen reduction reaction and oxygen evolution reaction
  • supercapacitor
  • fuel cell
  • carbon nanomaterials with energy and sustainability

Published Papers (5 papers)

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Research

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9 pages, 2702 KiB  
Communication
Highly Effective Self-Propagating Synthesis of Lamellar ZnO-Decorated MnO2 Nanocrystals with Improved Supercapacitive Performance
Nanomaterials 2021, 11(7), 1680; https://doi.org/10.3390/nano11071680 - 25 Jun 2021
Cited by 1 | Viewed by 1511
Abstract
A series of MOx (M = Co, Ni, Zn, Ce)-modified lamellar MnO2 electrode materials were controllably synthesized with a superfast self-propagating technology and their electrochemical practicability was evaluated using a three-electrode system. The results demonstrated that the specific capacitance varied with [...] Read more.
A series of MOx (M = Co, Ni, Zn, Ce)-modified lamellar MnO2 electrode materials were controllably synthesized with a superfast self-propagating technology and their electrochemical practicability was evaluated using a three-electrode system. The results demonstrated that the specific capacitance varied with the heteroatom type as well as the doping level. The low ZnO doping level was more beneficial for improving electrical conductivity and structural stability, and Mn10Zn hybrid nanocrystals exhibited a high specific capacitance of 175.3 F·g−1 and capacitance retention of 96.9% after 2000 cycles at constant current of 0.2 A·g−1. Moreover, XRD, SEM, and XPS characterizations confirmed that a small part of the heteroatoms entered the framework to cause lattice distortion of MnO2, while the rest dispersed uniformly on the surface of the carrier to form an interfacial collaborative effect. All of them induced enhanced electrical conductivity and electrochemical properties. Thus, the current work provides an ultrafast route for development of high-performance pseudocapacitive energy storage nanomaterials. Full article
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25 pages, 10860 KiB  
Article
NiCo2O4/RGO Hybrid Nanostructures on Surface-Modified Ni Core for Flexible Wire-Shaped Supercapacitor
Nanomaterials 2021, 11(4), 852; https://doi.org/10.3390/nano11040852 - 26 Mar 2021
Cited by 25 | Viewed by 3390
Abstract
In this work, we report surface-modified nickel (Ni) wire/NiCo2O4/reduced graphene oxide (Ni/NCO/RGO) electrodes fabricated by a combination of facile solvothermal and hydrothermal deposition methods for wire-shaped supercapacitor application. The effect of Ni wire etching on the microstructural, surface morphological [...] Read more.
In this work, we report surface-modified nickel (Ni) wire/NiCo2O4/reduced graphene oxide (Ni/NCO/RGO) electrodes fabricated by a combination of facile solvothermal and hydrothermal deposition methods for wire-shaped supercapacitor application. The effect of Ni wire etching on the microstructural, surface morphological and electrochemical properties of Ni/NCO/RGO electrodes was investigated in detail. On account of the improved hybrid nanostructure and the synergistic effect between spinel-NiCo2O4 hollow microspheres and RGO nanoflakes, the electrode obtained from Ni wire etched for 10 min, i.e., Ni10/NCO/RGO exhibits the lowest initial equivalent resistance (1.68 Ω), and displays a good rate capability with a volumetric capacitance (2.64 F/cm3) and areal capacitance (25.3 mF/cm2). Additionally, the volumetric specific capacitance calculated by considering only active material volume was found to be as high as 253 F/cm3. It is revealed that the diffusion-controlled process related to faradaic volume processes (battery type) contributed significantly to the surface-controlled process of the Ni10/NCO/RGO electrode compared to other electrodes that led to the optimum electrochemical performance. Furthermore, the wire-shaped supercapacitor (WSC) was fabricated by assembling two optimum electrodes in-twisted structure with gel electrolyte and the device exhibited 10 μWh/cm3 (54 mWh/kg) energy density and 4.95 mW/cm3 (27 W/kg) power density at 200 μA. Finally, the repeatability, flexibility, and scalability of WSCs were successfully demonstrated at various device lengths and bending angles. Full article
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10 pages, 27207 KiB  
Article
High-Mass Loading Hierarchically Porous Activated Carbon Electrode for Pouch-Type Supercapacitors with Propylene Carbonate-Based Electrolyte
Nanomaterials 2021, 11(3), 785; https://doi.org/10.3390/nano11030785 - 19 Mar 2021
Cited by 14 | Viewed by 2649
Abstract
Rational design and development of the electrodes with high-mass loading yet maintaining the excellent electrochemical properties are significant for a variety of electrochemical energy storage applications. In comparison with the slurry-casted electrode, herein, a hierarchically porous activated carbon (HPAC) electrode with higher mass [...] Read more.
Rational design and development of the electrodes with high-mass loading yet maintaining the excellent electrochemical properties are significant for a variety of electrochemical energy storage applications. In comparison with the slurry-casted electrode, herein, a hierarchically porous activated carbon (HPAC) electrode with higher mass loading (8.3 ± 0.2 mg/cm2) is successfully prepared. The pouch-type symmetric device (1 cell) with the propylene carbonate-based electrolyte shows the rate capability (7.1 F at 1 mA/cm2 and 4.8 F at 10 mA/cm2) and the cycling stability (83% at 12,000 cycles). On the other hand, an initial discharge capacitance of 32.4 F and the capacitance retention of 96% after 30,000 cycles are delivered from a pouch-type symmetric supercapacitor (five cells). The corresponding electrochemical performances are attributed to the fascinating properties of the HPAC and the synergistic features of the resulting electrode. Full article
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12 pages, 5498 KiB  
Article
Defect-Rich Heterogeneous MoS2/rGO/NiS Nanocomposite for Efficient pH-Universal Hydrogen Evolution
Nanomaterials 2021, 11(3), 662; https://doi.org/10.3390/nano11030662 - 08 Mar 2021
Cited by 21 | Viewed by 3159
Abstract
Molybdenum disulfide (MoS2) has been universally demonstrated to be an effective electrocatalytic catalyst for hydrogen evolution reaction (HER). However, the low conductivity, few active sites and poor stability of MoS2-based electrocatalysts hinder its hydrogen evolution performance in a wide [...] Read more.
Molybdenum disulfide (MoS2) has been universally demonstrated to be an effective electrocatalytic catalyst for hydrogen evolution reaction (HER). However, the low conductivity, few active sites and poor stability of MoS2-based electrocatalysts hinder its hydrogen evolution performance in a wide pH range. The introduction of other metal phases and carbon materials can create rich interfaces and defects to enhance the activity and stability of the catalyst. Herein, a new defect-rich heterogeneous ternary nanocomposite consisted of MoS2, NiS and reduced graphene oxide (rGO) are synthesized using ultrathin αNi(OH)2 nanowires as the nickel source. The MoS2/rGO/NiS-5 of optimal formulation in 0.5 M H2SO4, 1.0 M KOH and 1.0 M PBS only requires 152, 169 and 209 mV of overpotential to achieve a current density of 10 mA cm−2 (denoted as η10), respectively. The excellent HER performance of the MoS2/rGO/NiS-5 electrocatalyst can be ascribed to the synergistic effect of abundant heterogeneous interfaces in MoS2/rGO/NiS, expanded interlayer spacings, and the addition of high conductivity graphene oxide. The method reported here can provide a new idea for catalyst with Ni-Mo heterojunction, pH-universal and inexpensive hydrogen evolution reaction electrocatalyst. Full article
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Review

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34 pages, 3965 KiB  
Review
Oxygen Reduction Reaction in the Field of Water Environment for Application of Nanomaterials
Nanomaterials 2020, 10(9), 1719; https://doi.org/10.3390/nano10091719 - 30 Aug 2020
Cited by 19 | Viewed by 3219
Abstract
Water pollution has caused the ecosystem to be in a state of imbalance for a long time. It has become a major global ecological and environmental problem today. Solving the potential hidden dangers of pollutants and avoiding unauthorized access to resources has become [...] Read more.
Water pollution has caused the ecosystem to be in a state of imbalance for a long time. It has become a major global ecological and environmental problem today. Solving the potential hidden dangers of pollutants and avoiding unauthorized access to resources has become the necessary condition and important task to ensure the sustainable development of human society. To solve such problems, this review summarizes the research progress of nanomaterials in the field of water aimed at the treatment of water pollution and the development and utilization of new energy. The paper also tries to seek scientific solutions to environmental degradation and to create better living environmental conditions from previously published cutting edge research. The main content in this review article includes four parts: advanced oxidation, catalytic adsorption, hydrogen, and oxygen production. Among a host of other things, this paper also summarizes the various ways by which composite nanomaterials have been combined for enhancing catalytic efficiency, reducing energy consumption, recycling, and ability to expand their scope of application. Hence, this paper provides a clear roadmap on the status, success, problems, and the way forward for future studies. Full article
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