記述言語：英語   掲載種別：研究論文（学術雑誌）

<p>Electrochemical CO₂ reduction reaction (CO₂RR) is a promising approach for carbon recycling; however, its practical application is hindered by high overpotentials and the competing hydrogen evolution reaction. Here, we investigate metal phthalocyanines (MPcs; M = Fe, Co, Ni, and Cu) as molecular electrocatalysts and demonstrate that molecular-level integration of different MPcs can significantly enhance CO₂RR performance. α-phase composite crystals composed of CuPc and MPc, denoted as α-(CuPc+MPc), were successfully synthesized to achieve molecular-level integration of heterometallic phthalocyanines, enabling close proximity between distinct metal active sites. Among the catalysts examined, α-(CuPc+FePc) exhibited the highest activity, delivering a CO production rate of 19.76 µmol min⁻¹ with a Faradaic efficiency of 82.6 %, which is approximately 2.25 times higher than that of FePc alone. These results indicate that the molecular-level integration of heterometallic phthalocyanines induces a synergistic effect that promotes CO₂-to-CO conversion, providing a viable strategy for designing efficient molecular CO₂RR catalysts.</p>

DOI： 10.5796/electrochemistry.25-00181

Scopus

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/electrochemistry/94/3/94_25-00181/_pdf

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

<p>Nitric oxide (NO) detection is vital for environmental monitoring and medical diagnostics, yet conventional metal oxide gas sensors generally require high operating temperatures. Here, we report a low-temperature NO sensor based on inorganic halide perovskite Cs₂PdBr₆ nanoparticles synthesized via a mild, solution-based wet-chemical route followed by antisolvent crystallization. The antisolvent process effectively reduced the particle size to several tens of nanometers, enabling a distinct and reversible sensing response to NO even at 100 °C. The sensor exhibited good linearity in the concentration range of 10–150 ppm, a detection limit of 9.25 ppm, and excellent selectivity over interfering gases such as CO and ethanol. Density functional theory calculations indicate that NO preferentially adsorbs onto Pd sites on the Cs₂PdBr₆ surface and behaves as an electron donor, leading to a decrease in the resistance of <i>n</i>-type Cs₂PdBr₆. These results demonstrate that antisolvent-processed Cs₂PdBr₆ is a promising material for energy-efficient and selective NO sensing.</p>

DOI： 10.5796/electrochemistry.25-00159

Scopus

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/electrochemistry/94/2/94_25-00159/_pdf

記述言語：英語   掲載種別：研究論文（学術雑誌）

<p>Metal-air secondary batteries have attracted attention as a next-generation energy storage system due to their high energy density and environmentally friendly characteristics. However, it is important to develop a catalyst that can rapidly promote both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). We have found that Co₃W₃C and Co₃Mo₃C composite metal carbides prepared by a wet method have high bifunctional electrode performance, but the mechanism of action has not been elucidated. In this study, we comprehensively evaluated the adsorption behavior of oxygen molecules and surface hydroxyl groups, the charge density difference, and the effects of surface structure and chemical composition on catalytic activity by combining DFT (density functional theory) calculations and instrumental analysis. In particular, we found that Co₃Mo₃C optimizes the adsorption of oxygen molecules by metal compositing, contributing to the improvement of electrode catalytic performance.</p>

DOI： 10.5796/electrochemistry.24-00123

Scopus

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/electrochemistry/93/2/93_24-00123/_pdf

記述言語：英語   掲載種別：研究論文（学術雑誌）

In order to develop a catalyst for electrochemical CO<inf>2</inf> reduction with high power efficiency, we prepared molecular crystals with 2 types of metal phthalocyanine. Charge transfer complexes with acceptor were selected as the molecular crystal system to reduce the electrical resistance. Various bimetallic phthalocyanine systems consisting of cobalt phthalocyanine and another metal phthalocyanine were obtained as highly conductive separated stacked charge transfer complexes with iodine as an acceptor. The obtained catalysts for CO<inf>2</inf> reduction were evaluated using gas diffusion electrodes. The catalysts containing the bimetallic phthalocyanine system of cobalt and copper phthalocyanines showed higher CO<inf>2</inf> reduction current and higher CO production, indicating that the CO<inf>2</inf> reduction on cobalt phthalocyanine is enhanced by the H<inf>2</inf> formation reaction on copper phthalocyanine.

DOI： 10.1093/bulcsj/uoae116

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85212565234&origin=inward