Hokkaido University · Energy
Professor Palyam Subramanyam's research lab specializes in the development of advanced photoelectrodes for sustainable hydrogen production through photoelectrochemical (PEC) water splitting. The lab focuses on designing efficient, low-cost, and stable semiconductor materials—such as metal oxides, chalcogenides, and perovskites—sensitized with narrow-band-gap semiconductors or carbon-based materials to enhance light absorption and charge carrier separation. Key research directions include bandgap engineering, heterostructure integration (e.g., TiO₂/Bi₂Se₃, Bi₂S₃@rGO, CuBi₂O₄), and plasmonic enhancement to improve photocurrent density and solar-to-hydrogen conversion efficiency. The lab also investigates interfacial charge transfer dynamics in perovskite-based systems to optimize performance in renewable energy applications.
Figures are computed from collected data and may differ slightly.
Semiconducting photoelectrodes emerge as an efficient platform for converting light energy into hydrogen by photoelectrochemical (PEC) water splitting. The present study reports the improvement in PEC performance using metal oxide photoelectrodes sensitized with a narrow-band-gap semiconductor Bi2Se3, which extends the light response beyond the visible region and generates and transports charge carriers. When Bi2Se3 nanoflowers (NFs) were incorporated into the TiO2 electrode, the extent of hydro
The design of photo-electrodes with good light absorption, effective photo-generated charge carrier separation and fast charge transportation are key parameters for photoelectrochemical (PEC) hydrogen generation.
Visible-light-active photoelectrodes are more responsive to high-energy conversion efficiency in photoelectrochemical (PEC) water splitting. In this work, we fabricated a bismuth sulfide@reduced graphene oxide (Bi2S3@rGO) nanocomposite photoanode via facile synthetic methods. Typical results show that the Bi2S3@rGO nanocomposite exhibited a high photocurrent density of 6.06 mA cm–2 and a maximum applied bias photon-to-current efficiency (ABPE) of 4.2% at 0.32 V. Moreover, Bi2S3 nanorods have mor
Hydrogen has tremendous potential as a sustainable energy source for the future. Unassisted photoelectrochemical water splitting is a promising approach to producing hydrogen fuel from sunlight and water. To economically produce hydrogen, efficient, low-cost, environmentally friendly, and long-term stable photocathodes and photoanodes are needed. In this study, we have fabricated CuBi2O4 (CBO) photocathodes using drop-casting, hydrothermal, and electrodeposition methods. The resulting photocatho
A wide range of technologies has been developed for producing hydrogen economically and in greener ways. Photoelectrochemical water splitting using photoelectrodes submerged in a bath electrolyte forms a major route of hydrogen evolution. The efficacy of water splitting is improved by sensitizing metal oxide photoelectrodes with narrow bandgap semiconductors that efficiently absorb sunlight and generate and transport charge carriers. Here we show that the efficiencies of photocurrent generation
Bandgap-engineered inorganic and hybrid halide perovskite (HP) films, nanocrystals, and quantum dots (PQDs) are promising for solar cells. Fluctuations of photoinduced electron transfer (PET) rates affect the interfacial charge separation efficiencies of such solar cells. Electron donor- or acceptor-doped perovskite samples help analyze PET and harvest photogenerated charge carriers efficiently. Therefore, PET in perovskite-based donor-acceptor (D-A) systems has received considerable attention.
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