Special Issue "Nano-Materials in Electrocatalyst"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: 30 April 2021.

Special Issue Editor

Dr. Sung Mook Choi
Website
Guest Editor
Materials Center for Energy Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-gu, Changwon, Gyeongnam 51508, Korea

Special Issue Information

Dear Colleagues,

Renewable energy has been recognized as a clean, nonpolluting, and unlimited energy source that can resolve global warming and environmental pollution problems caused by using fossil fuels. Renewable energy can usually be converted into other forms, such as electricity, for easy use and transportation as well as safe storage. At the time, the conversion efficiency should be increased by using the electrochemical conversion method with a nanostructured electrocatalyst. Therefore, the electrocatalyst should have high activity, long-term stability, reproducibility, and be amenable to mass production by controlling the surface morphology in addition to structural and electronic modification of nanomaterials for commercialization.

This Special Issue will especially focus on the synthesis and analysis of 0D (cluster, single atom, etc.), 1D (nanowire, nanorod, nanotube etc.), 2D (graphene, transition metal dichalcogenides, MXene, Xene, etc.), and 3D (nanoparticle, nanoflower, etc.) structured nanomaterials for electrochemical energy conversion systems such as fuel cells, water electrolysis, battery, supercapacitors, electrochemical conversion of CO2 and NH3, electrochemical chlorine evolution reaction etc., including the development of computational material design and identifying reaction mechanisms. Other topics not in the list of specified topics are also welcome if they are related to the theme of the Special Issue.

This Special Issue is open to both original research articles as well as review papers that help researchers worldwide understand the latest trends and progress in the research field encompassing “Nanomaterials in Electrocatalysts”.

Dr. Sung Mook Choi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanomaterials
  • electrocatalyst
  • renewable energy
  • electrochemical conversion

Published Papers (1 paper)

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Research

Open AccessArticle
Enhanced Desalination Performance of Capacitive Deionization Using Nanoporous Carbon Derived from ZIF-67 Metal Organic Frameworks and CNTs
Nanomaterials 2020, 10(11), 2091; https://doi.org/10.3390/nano10112091 - 22 Oct 2020
Abstract
Capacitive deionization (CDI) based on ion electrosorption has recently emerged as a promising desalination technology due to its low energy consumption and environmental friendliness compared to conventional purification technologies. Carbon-based materials, including activated carbon (AC), carbon aerogel, carbon cloth, and carbon fiber, have [...] Read more.
Capacitive deionization (CDI) based on ion electrosorption has recently emerged as a promising desalination technology due to its low energy consumption and environmental friendliness compared to conventional purification technologies. Carbon-based materials, including activated carbon (AC), carbon aerogel, carbon cloth, and carbon fiber, have been mostly used in CDI electrodes due their high surface area, electrochemical stability, and abundance. However, the low electrical conductivity and non-regular pore shape and size distribution of carbon-based electrodes limits the maximization of the salt removal performance of a CDI desalination system using such electrodes. Metal-organic frameworks (MOFs) are novel porous materials with periodic three-dimensional structures consisting of metal center and organic ligands. MOFs have received substantial attention due to their high surface area, adjustable pore size, periodical unsaturated pores of metal center, and high thermal and chemical stabilities. In this study, we have synthesized ZIF-67 using CNTs as a substrate to fully utilize the unique advantages of both MOF and nanocarbon materials. Such synthesis of ZIF-67 carbon nanostructures was confirmed by TEM, SEM, and XRD. The results showed that the 3D-connected ZIF-67 nanostructures bridging by CNTs were successfully prepared. We applied this nanostructured [email protected] to CDI electrodes for desalination. We found that the salt removal performance was significantly enhanced by 88% for 30% [email protected] electrodes as compared with pristine AC electrodes. This increase in salt removal behavior was analyzed by electrochemical analysis such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements, and the results indicate reduced electrical impedance and enhanced electrode capacitance in the presence of [email protected] Full article
(This article belongs to the Special Issue Nano-Materials in Electrocatalyst)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Computational approaches for durable electro-catalyst in the PEM Fuel Cell
Authors: Jong Min Lee; Min Ho Seo1
Affiliation: 1 Buan Fuel Cell Center, New and Renewable Energy Institute,Korea Institute of Energy Research (KIER),
Abstract: Development of highly active electrocatalysts that are cost competitive takes the center stage in research fields for next-generation electrochemical energy conversion and storage systems like fuel cell and metal-air battery. Regarding the systems for commercialization, there are various challengeable issues, which should overcome sluggish kinetics and stability on the electrocatalyst for the aimed reactions such as oxygen reduction reaction (ORR) occurred in the high over-potential and harsh condition. Although there was huge technological advancement as minimizing usage of noble metal or developing non-precious owing to many attempts to reach the purpose in the past decade, it still needs further improvement in order to gain acceptance in a market. To find new material or optimize, the efficient way would be initialized from the knowledge of the underlying physical and chemical mechanisms in a material system. For the reason, therefore, fundamental studies using quantum mechanics (QM) along with experimental confirmation have been commonly conducted to explain the activity and stability of oxygen reactions. These approaches are very successful and provide a fundamental insight to scientist and researcher. Nevertheless, calculative simulations are still the restrictions to obtain trustable data and to predict correct consequences, especially on large scale modeling. This talk will present recent efforts for accurate modeling with experimental data. We predicted and validated the ORR (or OER) activity and stability on various materials like carbon-based materials, metal oxides and metals in density functional theory (DFT). The force field, which is an efficient way of describing the dynamics with large-scale simulations, was developed to simulate large scale models. This synergetic approach using both computational models and experiments with physicochemical analyses would accelerate to find new materials and to optimize catalyst performance. This work was supported by the NRF of Korea Grant [NRF-2017R1D1A1B04031539 & NRF-2018K1A3A1A09079061]

Title: Effects of annealing temperature on the oxygen evolution reaction activity of copper-cobalt oxide nanosheets on Ni foam
Authors: Geul Han Kim; Yoo Sei Park; Juchan Yang; Myeong Je Jang; Jaehoon Jung; Jooyoung Lee; Yong Ho Park; Sung Mook Choi
Affiliation: 1 Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science, Changwon, 642831, Republic of Korea 2 Department of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
Abstract: Abstract: Developing high-performance, high-stable and low-cost catalysts of oxygen evolution reaction (OER) are one of major challenges in water electrolysis technology. However, Ir and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. So, it should be studied to replace it with a non-precious metal. In this work, copper-cobalt oxide nanosheets (CCO) electrode were synthesized by annealing process of copper-cobalt hydroxide (CCOH) on Ni foam by the electrodeposition. CCOH was annealed at various temperatures, and it was confirmed that the structure was changed to CCO above 250°C. In addition, it was observed that the nanosheets were agglomerated when annealed at a high temperature of 300°C. The CCO electrode annealed at 250°C provided a high surface area and an efficient electron pathway by direct growth on Ni foam. These CCO electrode exhibited much enhanced OER activity (276 mV at a current density 20 mA/cm2) compared with that of both CCOH (290 mV at a current density 20 mA/cm2), Co3O4 (353 mV at a current density 20 mA/cm2) electrodes, and commercial IrO2 catalyst (382 mV at a current density 20 mA/cm2). It also showed highly stability in high pH conditions, showing their potential as low-cost and highly efficient OER catalysts.

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