Byeon, Ayeong Cho, Jinwon Kim, Jo G. Min Chae, Keun Hwa Park, Hee-Young Hong, Seek Won Ham, Hyung Chul Lee, Seung Woo Yoon, Ki Ro Kim, Jin Young 2024-01-19T17:33:52Z 2024-01-19T17:33:52Z 2021-09-04 2020-05 2055-6756 https://pubs.kist.re.kr/handle/201004/118695 Electrochemical hydrogen peroxide (H2O2) production by the direct two-electron (2e(-)) oxygen reduction reaction (ORR) has received much attention as a promising alternative to the industrially developed anthraquinone fabrication process. Transition metal (M) and nitrogen doped carbon (M-N-C, M = Fe or Co) catalysts are known to be active for four electron ORR pathways via two + two electron transfer, where the former is for the ORR and the latter for the peroxide reduction reaction (PRR). Here, we report mesoporous N-doped carbon/manganese hybrid electrocatalysts composed of MnO and Mn-N-x coupled with N-doped carbons (Mn-O/N@NCs), which have led to the development of electrocatalysis towards the 2e(-) ORR route. Based on the structural and electrochemical characterization, the number of transferred electrons during the ORR on the Mn-O/N@NCs was found to be close to the theoretical value of the 2e(-) process, indicating their high activity toward H2O2. The favored ORR process arose due to the increased number of Mn-Nx sites within the mesoporous N-doped carbon materials. Furthermore, there was a strong indication that the PRR is significantly suppressed by adjacent MnO species, demonstrating its highly selective production of H2O2 (480%) from the oxygen electrochemical process. The results of a real fuel cell device test demonstrated that an Mn-O/N@NC catalyst sustains a very stable current, and we attributed its outstanding activity to a combination of site-dependent facilitation of 2e(-) transfer and a favorable porosity for mass transport. English ROYAL SOC CHEMISTRY High-yield electrochemical hydrogen peroxide production from an enhanced two-electron oxygen reduction pathway by mesoporous nitrogen-doped carbon and manganese hybrid electrocatalysts Article 10.1039/c9nh00783k 1 NANOSCALE HORIZONS, v.5, no.5, pp.832 - 838 NANOSCALE HORIZONS 5 5 832 838 N scie scopus 000531354100010 2-s2.0-85085972115 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article DENSITY-FUNCTIONAL THEORY CATALYSTS H2O2 NANOPARTICLES IRON PD GOLD