Hydrophilicity as a Key Factor in Enhancing Oxygen Evolution Reaction on Rhombohedral Boron Monosulfide/Ni-Foam Electrodes with Carbon Material

作者：Karin Oiwa, Ryuki Tsuji, Rimpei Ueno, Jingyu Li, Linghui Li, Myu Kawase, Keita Nakayama, Natsumi Noguchi, Susmita Roy, Osamu Oki, Ryotaro Sakakibara, Ken Sakaushi, Masashi Miyakawa, Takashi Taniguchi, Takahiro Kondo · 发表于：ACS Applied Energy Materials · 年份：2025 · DOI：10.1021/acsaem.5c02078 · 被引用次数：4 · 研究领域：Electrocatalysts for Energy Conversion、Fuel Cells and Related Materials、Advancements in Battery Materials

High Resolution Image Download MS PowerPoint Slide In this study, we systematically investigated the impact of carbon support properties on the oxygen evolution reaction (OER) activity of rhombohedral boron monosulfide (r-BS), a two-dimensional catalyst composed solely of main group elements. Specifically, we examined the effects of crystallinity (crystallite size), defect density (Raman I D / I G ratio), and wettability (water contact angle) for four carbon materials: graphene, graphite, carbon black, and multiwalled carbon nanotube (MWCNT). A large number of independent r-BS/carbon material/Ni-foam electrodes were fabricated, and the average current density at 1.8 V vs RHE was evaluated through statistical analysis. The OER activity followed the order: graphene ≈ graphite > carbon black > MWCNT. However, no clear correlation was found with crystallite size or I D / I G ratio. In contrast, the contact angle showed a clear inverse relationship with OER activity, with measured values of 0, 55, 99, and 113° for graphene, graphite, carbon black, and MWCNT, respectively. The graphene-based composite showed the highest current density, although with large variability. In contrast, the graphite-based composite demonstrated similarly high activity with significantly better reproducibility. These findings highlight that the hydrophilicity of the carbon support, which governs the detachment of oxygen gas bubbles from the electrode surface, is a dominant factor in high-current-density ...