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Advanced Synthesis and Multifunctional Applications of Transition Metal Nanomaterials for Energy and Environmental Solutions

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: 10 July 2026 | Viewed by 982

Special Issue Editor


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Guest Editor
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria
Interests: computational chemistry; ab initio studies; transition metal oxides; chalcogenides; photoactivation; catalysis
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Special Issue Information

Dear colleagues,

Transition metal nanomaterials have versatile applications, from energy and hydrogen storage to redox catalysis in a broad range of reactions. The catalytic redox reactions of nitrogen oxides, NOx, and the CO/CO2 photo-/electro-catalytic redox reaction have direct environmental impacts. The design of efficient materials for these applications requires specialized engineering techniques, which include doping, the anchoring of the catalytic active substrate, and the careful monitoring of the particle size. In recent years, layered materials have been widely studied at the experimental and theoretical levels. Though noble metals remain the best choice for catalytic applications, recent studies have pointed out the great potential of 3d transition metals and their oxides or chalcogenides, namely Ti, V, Cr, Mn, Fe, Ni, and Cu. Novel trends in their synthesis include the production of nanosized and layered materials, which requires the careful monitoring of specific properties relevant to the desired application, such as the band gaps and number and distribution of defects. Theoretical models aid in predicting these properties and are invaluable in the preliminary screening of potentially active compositions. 

Furthermore, there are certainly more redox reactions which could benefit from the design of an efficient photoelectrochemical cell.

I warmly invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

I look forward to receiving your valuable contributions.

Dr. Ellie Uzunova
Guest Editor

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Keywords

  • energy storage
  • hydrogen storage
  • redox reaction catalysis
  • layered transition metal materials
  • transition metal oxides
  • transition metal chalcogenides
  • photocatalytic reactions

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Published Papers (1 paper)

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Research

14 pages, 2237 KB  
Article
Electrocatalytic Activity of Delafossite CuCoO2 for Alkaline Oxygen Evolution Reaction and Acidic Hydrogen Evolution Reaction
by Seong-Yong Kim, Dongjin Kim and Yun-Hyuk Choi
Materials 2026, 19(4), 794; https://doi.org/10.3390/ma19040794 - 18 Feb 2026
Viewed by 678
Abstract
Electrochemical water splitting requires electrocatalysts that operate efficiently and durably under disparate electrolyte environments. Herein, pristine CuCoO2 particles were synthesized via a hydrothermal route as a single-phase rhombohedral (3R) delafossite structure composed of hexagonal, single-crystalline particles (~2.6 μm) with a uniform elemental [...] Read more.
Electrochemical water splitting requires electrocatalysts that operate efficiently and durably under disparate electrolyte environments. Herein, pristine CuCoO2 particles were synthesized via a hydrothermal route as a single-phase rhombohedral (3R) delafossite structure composed of hexagonal, single-crystalline particles (~2.6 μm) with a uniform elemental distribution. The prepared CuCoO2 was then evaluated as a bifunctional electrocatalyst for the alkaline oxygen evolution reaction (OER) and the acidic hydrogen evolution reaction (HER), with a deliberate separation of electrode-level performance and intrinsic per-site activity. X-ray photoelectron spectroscopy revealed mixed Cu+/Cu2+ and Co2+/Co3+ states, together with signatures of copper and oxygen vacancies, indicating a defect-rich surface chemistry. In 1 M KOH, the CuCoO2 loaded on carbon fiber paper (CFP) delivered an OER overpotential of 404.38 mV at 10 mA/cm2 in 1 M KOH (Tafel slope = 102.39 mV/dec; charge-transfer resistance (Rct) decreased from 19.32 to 5.78 Ω with increasing potential) and an HER overpotential of 246.46 mV at −10 mA/cm2 in 0.5 M H2SO4, with sluggish kinetics (Tafel slope = 429.17 mV/dec; high Rct = ~1.0–1.1 kΩ). Despite this, CuCoO2 exhibited markedly higher intrinsic activity in acidic HER (ECSA = 82.97 cm2; TOF = 0.1432 s−1 at −0.2 V vs. RHE) than in alkaline OER (ECSA = 9.56 cm2; TOF = 0.079 s−1 at 1.5 V vs. RHE), indicating that acidic HER performance is primarily limited by electrode-level microstructural factors. This work provides, to the best of our knowledge, the first evaluation of acidic HER activity of delafossite CuCoO2 and underscores electrode-level microstructural engineering as a key route to better harness its intrinsic activity for practical water electrolysis. Full article
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