Fabrication of polycrystalline phosphorus-doped diamond electrodes from red phosphorus

Tomokiyo Moriguchi; Mai Tomisaki; Susumu Sato; Jin Nakamura; Hideaki Yamada; Yasuaki Einaga

doi:10.1039/d3cp06018g

Fabrication of polycrystalline phosphorus-doped diamond electrodes from red phosphorus

Phys Chem Chem Phys. 2024 May 22;26(20):14825-14831. doi: 10.1039/d3cp06018g.

Authors

Tomokiyo Moriguchi^{1

2}, Mai Tomisaki³, Susumu Sato⁴, Jin Nakamura⁵, Hideaki Yamada⁶, Yasuaki Einaga¹

Affiliations

¹ Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan. einaga@chem.keio.ac.jp.
² ADD Co., Ltd, 25-1 Miyamoto, Numazu 410-0301, Japan.
³ International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
⁴ Graduate School of Engineering, Saitama Institute of Technology, Fukaya 369-0203, Japan.
⁵ Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
⁶ Diamond Wafer Team, Advanced Power Electronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.

PMID: 38721684
DOI: 10.1039/d3cp06018g

Abstract

Polycrystalline phosphorus-doped diamond was fabricated by the quartz-tube-type microwave plasma-assisted chemical vapor deposition method. Significantly, red phosphorus was used as a source of phosphorous, instead of PH₃. Phosphorus-doped diamond electrodes with hydrogen-terminated and oxygen-terminated surfaces were investigated for the redox reactions of K₃[Fe(CN)₆] and [Ru(NH₃)₆]Cl₃. The carrier concentration was estimated as 2.1-5.3 × 10¹⁸ cm^-3 from electrochemical impedance measurements. Polycrystalline phosphorus-doped diamond shows great promise as chemical electrode materials.