Photoelectrochemical Fabrication of CuO-Cu2O Nanocomposite Semiconductors by High-Frequency Potential-Switching in Copper(II)-Tartrate Complex Aqueous Solution and the Energy Band Structures

Autor:	Shinichi Yamamoto, Ryoga Yokoyama, Kosuke Imahori, Pei Loon Khoo, Natsuko Asano, Shunsuke Asahina, Tsutomu Shinagawa, Masanobu Izaki
Rok vydání:	2023
Předmět:	Renewable Energy Sustainability and the Environment Materials Chemistry Electrochemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials
Zdroj:	Journal of The Electrochemical Society. 170:032505
ISSN:	1945-7111 0013-4651
Popis:	P-type CuO-Cu2O nanocomposite semiconductors composed of Cu2O-embedded CuO aggregations and Cu2O aggregation consisting of space-filling CuO grains have been fabricated by photoelectrochemical high-frequency potential-switching of 100 to 1000 cycles in an aqueous solution containing copper(II) sulfate hydrate, tartaric acid, and sodium hydroxide, and the size of both the CuO and Cu2O grains decreased from 40–44 nm to approximately 10 nm remaining the characteristic monoclinic and cubic lattices with an increase in cycle numbers. The bandgap energy of CuO components was almost a constant value of 1.5 eV, and the Cu2O components showed a decrease in bandgap energy from 2.05 eV to 1.85 eV with an increase in cycle number due to the Cu2+ state incorporation, and the CuO-Cu2O nanocomposites possessed an ionization energy of approximately 5.2 eV and work function of approximately 4.6 eV respectively, and were close to those for single CuO and Cu2O layers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a8d643cda06e3f0cde7368ed462b5cb0 https://doi.org/10.1149/1945-7111/acb616 Zobrazit plný text záznamu