0616635 - FZÚ 2025 RIV US eng J - Journal Article
Pfeifer, Rene - Szabó, Ondrej - Potocký, Štěpán - Lorinčík, J. - Stehlík, Štěpán - Marton, M. - Vojs, M. - Kromka, Alexander
Generation of nanoporous diamond electrodes fabricated by a low-cost process at moderate temperatures.
ACS Applied Engineering Materials. Roč. 1, č. 5 (2023), s. 1446-1454. ISSN 2771-9545. E-ISSN 2771-9545
R&D Projects: GA ČR(CZ) GF23-04322L; GA MŠMT(CZ) EF16_019/0000760; GA MŠMT LM2023051
Institutional support: RVO:68378271
Keywords : boron-doped diamond * boron-doped diamond * diamond electrode * porous morphology * molten salt thermal etching * SEM * electrochemistry * supercapacitor
OECD category: Materials engineering
Method of publishing: Open access
DOI: https://doi.org/10.1021/acsaenm.3c00125

A unique approach to fabricate nanoporous diamond morphology using molten salt thermal etching (MSTE) at a moderate temperature (450 °C) of boron-doped ultrananocrystalline diamond (B-UNCD) electrodes is presented. The developed one-step method is simple, environmentally friendly, inexpensive, and provides nanoporous diamond electrodes with nearly unlimited Z-depths. Moreover, it is also applicable to non-conductive diamond films. The appropriate etching mechanism is attributed to the preferential etching of sp2 carbon phases localized at the grain boundaries by MSTE-generated highly oxidizing species. The fabricated B-UNCD electrodes show an increase in the electrochemical active area (ECSA) of 15% after 3 h of the MSTE treatment, making them promising materials to use as sensors for electroactive species. Such nanoporous B-UNCD presents a favorable working electrode with increased sensitivity for the electrochemical detection of 4-nitrophenol. Moreover, the fabricated nanoporous B-UNCD electrode showed 49 times higher capacitance (3534 μF cm–2) than the pristine (non-porous) B-UNCD material (71.50 μF cm–2).
Permanent Link: https://hdl.handle.net/11104/0363886