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Micromachines
Special Issues
Nanostructure for Energy Conversion and Storage
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Nanostructure for Energy Conversion and Storage

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C：Chemistry".

Deadline for manuscript submissions: closed (1 November 2020) | Viewed by 7032

Special Issue Editor

Prof. Dr. Inho Nam

E-Mail Website
Guest Editor
School of Chemical Engineering and Materials Science, Institute of Energy Converting Soft Materials, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
Interests: stretchable energy storages; solar energy conversion; nanomaterials; density functional theory calculations
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With rapidly growing concern over the global energy supply and consumption, there is an unprecedentedly high demand for the development of efficient energy conversion and storage systems. In particular, it is an urgent task to develop advanced materials with novel designs and functions that can overcome the current challenges of energy devices. Therefore, through this Special Issue, we are seeking inspiring studies that show recent progress in micro/nanostructures in relation to renewable energy storage and conversion. We invite you to submit research papers, communications, and reviews from a broad range of topics related to future energy resources, low emission energy conversion, energy storage, energy efficiency, and many other related applications. High-quality manuscripts will be published in the Special Issue after considerable peer-review. We will work hard toward the rapid and wide dissemination of your valuable research results, recent developments, and novel applications in the area of the nanotechnologies, renewable energy storage, and conversion.

Prof. Dr. Inho Nam
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 submissions that pass pre-check are 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. Micromachines 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 2600 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

  • Secondary batteries
  • Fuel–cell
  • Solar Cell
  • Photocatalyst
  • Electrocatalyst
  • Nanotechnology
  • Renewable energy
  • Energy storage
  • Energy conversion

Published Papers (2 papers)

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Research

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15 pages, 3458 KiB  
Article
High-Performance Pure Sine Wave Inverter with Robust Intelligent Sliding Mode Maximum Power Point Tracking for Photovoltaic Applications
by En-Chih Chang
Micromachines 2020, 11(6), 585; https://0-doi-org.brum.beds.ac.uk/10.3390/mi11060585 - 11 Jun 2020
Cited by 5 | Viewed by 3188
Abstract
Photovoltaic (PV) power generation has been extensively used as a result of the limited petrochemical resources and the rise of environmental awareness. Nevertheless, PV arrays have a widespread range of voltage changes in a variety of solar radiation, load, and temperature circumstances, so [...] Read more.
Photovoltaic (PV) power generation has been extensively used as a result of the limited petrochemical resources and the rise of environmental awareness. Nevertheless, PV arrays have a widespread range of voltage changes in a variety of solar radiation, load, and temperature circumstances, so a maximum power point tracking (MPPT) method must be applied to get maximum power from PV systems. Sliding mode control (SMC) is effectively used in PV power generation due to its robustness, design simplicity, and superior interference suppression. When the PV array is subject to large parameter changes/highly uncertain conditions, the SMC leads to degraded steady-state performance, poor transient tracking speed, and unwanted flutter. Therefore, this paper proposes a robust intelligent sliding mode MPPT-based high-performance pure sine wave inverter for PV applications. The robust SMC is designed through fast sliding regime, which provides fixed time convergence and a non-singularity that allows better response in steady-state and transience. To avoid the flutter caused by system unmodeled dynamics, an enhanced cuckoo optimization algorithm (ECOA) with automatically adjustable step factor and detection probability is used to search control parameters of the robust sliding mode, thus finding global optimal solutions. The coalescence of both robust SMC and ECOA can control the converter to obtain MPPT with faster convergence rate and without untimely trapping at local optimal solutions. Then the pure sine wave inverter with robust intelligent sliding mode MPPT of the PV system delivers a high-quality and stable sinusoidal wave voltage to the load. The efficacy of the proposed method is validated on a MPPT pure sine wave inverter system by using numerical simulations and experiments. The results show that the output of the proposed PV system can improve steady-state performance and transient tracking speed. Full article
(This article belongs to the Special Issue Nanostructure for Energy Conversion and Storage)
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Review

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25 pages, 3833 KiB  
Review
Free-Form and Deformable Energy Storage as a Forerunner to Next-Generation Smart Electronics
by Soyul Kwak, Jihyeon Kang, Inho Nam and Jongheop Yi
Micromachines 2020, 11(4), 347; https://0-doi-org.brum.beds.ac.uk/10.3390/mi11040347 - 26 Mar 2020
Cited by 14 | Viewed by 3566
Abstract
Planar and rigid conventional electronics are intrinsically incompatible with curvilinear and deformable devices. The recent development of organic and inorganic flexible and stretchable electronics enables the production of various applications, such as soft robots, flexible displays, wearable electronics, electronic skins, bendable phones, and [...] Read more.
Planar and rigid conventional electronics are intrinsically incompatible with curvilinear and deformable devices. The recent development of organic and inorganic flexible and stretchable electronics enables the production of various applications, such as soft robots, flexible displays, wearable electronics, electronic skins, bendable phones, and implantable medical devices. To power these devices, persistent efforts have thus been expended to develop a flexible energy storage system that can be ideally deformed while maintaining its electrochemical performance. In this review, the enabling technologies of the electrochemical and mechanical performances of flexible devices are summarized. The investigations demonstrate the improvement of electrochemical performance via the adoption of new materials and alternative reactions. Moreover, the strategies used to develop novel materials and distinct design configurations are introduced in the following sections. Full article
(This article belongs to the Special Issue Nanostructure for Energy Conversion and Storage)
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