Baek, Jae-Hoon Lee, Se Jung Kim, Na Hyun Lee, Seung Min Seo, Jeong-Min Noh, Hyuk-Jun Jeon, Jong-Pil Li, Changqing Kwak, Sang Kyu Kweon, Do Hyung Jeon, In-Yup Baek, Jong-Beom 2025-08-31T03:30:19Z 2025-08-31T03:30:19Z 2025-08-27 2025-10 1613-6810 https://pubs.kist.re.kr/handle/201004/153081 Proton exchange membrane water electrolysis (PEMWE) is a promising strategy for sustainable hydrogen production, but its application is limited by the high cost and instability of catalysts under acidic operation conditions. Here, the study reports group VA element-doped graphitic nanoplatelets (XGnPs; X = N, P, or Sb) as effective supports to enhance both the activity and durability of electrocatalysts. The resulting platinum (Pt) nanoparticles on XGnPs (Pt@XGnPs) catalysts exhibit improved charge transfer to the metal and strong metal-support interactions. Among them, Pt@SbGnP exhibits the best performance, with a low overpotential of 15.3 mV at 10 mA cm-2 and a Tafel slope of 27.8 mV dec-1, surpassing commercial Pt/C. System-level testing further confirmed its superiority, achieving 68.2 mA cm-2 at 1.9 V with 96.6% Faradaic efficiency for two-electrode system and 1 A cm-2 at 1.724 V for full PEMWE system. Density functional theory calculations reveal that heteroatom doping modulates the charge transfer to the metal, facilitating efficient hydrogen evolution reaction (HER) kinetics. English Wiley - V C H Verlag GmbbH & Co. High-Period Element Doping as a Key Driver of Hydrogen Evolution in a Proton Exchange Membrane Water Electrolyzer Article 10.1002/smll.202507086 1 Small, v.21, no.39 Small 21 39 Y scie scopus 001547844700001 2-s2.0-105012877670 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article GRAPHENE NANOPLATELETS EFFICIENT CATALYST high-period heteroatom doping hydrogen evolution reaction (HER) metal-support interaction proton exchange membrane water electrolysis (PEMWE) electrocatalyst