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Advanced Metal Oxide and Its Composites for Electro/Photo-Catalytic Hydrogen Generation and Supercapacitors

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: 31 December 2025 | Viewed by 286

Special Issue Editors


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Guest Editor
Division of System Semiconductor, College of AI Convergence, Dongguk University, Seoul 04620, Republic of Korea
Interests: electrocatalysis; water splitting; hydrogen generation; supercapacitor; battery; electrochromism; solar cell; PEC solar cell

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Guest Editor
Department of Nanotechnology and Advanced Materials Engineering, Hybrid Materials Research Center (HMC), Sejong University, Seoul 05006, Republic of Korea
Interests: electrochemical water splitting

Special Issue Information

Dear Colleagues,

A major concern for humankind is the linearly increasing energy demand due to ongoing issues such as rapid population growth as well as over-reliance on nonrenewable and pollution-causing energy options, such as oil and gas. The world is seeking new affordable, sustainable, and nonpolluting alternatives. Moreover, the fastest-growing automotive industries, with electric options rather than traditional fuels, also increase the world’s energy demand. Therefore, there is an undeniable need to focus on energy generation and storage from abundantly available renewable energy sources, such as the sun, wind, and water. This Special Issue, titled “Advanced Metal Oxide and Its Composites for Electro/Photo-Catalytic Hydrogen Generation and Supercapacitors” is aimed to collect innovative, outstanding, and original research as well as review articles on electrocatalysis, photocatalysis, and supercapacitor applications. The potential materials include inorganic metal oxide, layered double hydroxides (LDHs), composites, and heterostructures, but are not limited to them. Subtopics include the fabrication of functional materials by using various chemical and physical techniques, the optimizing and enhancement of electrochemical performances, the investigation of mechanisms and structural, optical, and morphological properties, in situ and ex situ technique unitization for analysis, theoretical investigations, DFT analysis, commercial compatibility, suitability, sustainability, and so on. It will provide a great avenue for examining the recent trends and progress in the generation of alternative energy and storage materials studied for the purpose of coping with present energy demands. It is our great pleasure to invite you to submit original research and review articles falling within the scope of this Special Issue.

Dr. Akbar I. Inamdar
Dr. Supriya A. Patil
Guest Editors

Manuscript Submission Information

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Keywords

  • electrocatalysis
  • water splitting
  • supercapacitor
  • photocatalysis
  • electrochemistry
  • inorganic materials
  • nanomaterials
  • structural and morphological properties
  • energy storage

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Published Papers (1 paper)

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Review

20 pages, 4256 KiB  
Review
Recent Progress and Future Perspectives of MNb2O6 Nanomaterials for Photocatalytic Water Splitting
by Parnapalle Ravi and Jin-Seo Noh
Materials 2025, 18(15), 3516; https://doi.org/10.3390/ma18153516 - 27 Jul 2025
Abstract
The transition to clean and renewable energy sources is critically dependent on efficient hydrogen production technologies. This review surveys recent advances in photocatalytic water splitting, focusing on MNb2O6 nanomaterials, which have emerged as promising photocatalysts due to their tunable band [...] Read more.
The transition to clean and renewable energy sources is critically dependent on efficient hydrogen production technologies. This review surveys recent advances in photocatalytic water splitting, focusing on MNb2O6 nanomaterials, which have emerged as promising photocatalysts due to their tunable band structures, chemical robustness, and tailored morphologies. The objectives of this work are to (i) encompass the current synthesis strategies for MNb2O6 compounds; (ii) assess their structural, electronic, and optical properties in relation to photocatalytic performance; and (iii) elucidate the mechanisms underpinning enhanced hydrogen evolution. Main data collection methods include a literature review of experimental studies reporting bandgap measurements, structural analyses, and hydrogen production metrics for various MNb2O6 compositions—especially those incorporating transition metals such as Mn, Cu, Ni, and Co. Novelty stems from systematically detailing the relationships between synthesis routes (hydrothermal, solvothermal, electrospinning, etc.), crystallographic features, conductivity type, and bandgap tuning in these materials, as well as by benchmarking their performance against more conventional photocatalyst systems. Key findings indicate that MnNb2O6, CuNb2O6, and certain engineered heterostructures (e.g., with g-C3N4 or TiO2) display significant visible-light-driven hydrogen evolution, achieving hydrogen production rates up to 146 mmol h−1 g−1 in composite systems. The review spotlights trends in heterojunction design, defect engineering, co-catalyst integration, and the extension of light absorption into the visible range, all contributing to improved charge separation and catalytic longevity. However, significant challenges remain in realizing the full potential of the broader MNb2O6 family, particularly regarding efficiency, scalability, and long-term stability. The insights synthesized here serve as a guide for future experimental investigations and materials design, advancing the deployment of MNb2O6-based photocatalysts for large-scale, sustainable hydrogen production. Full article
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