Identifying the Active Sites of a Single Atom Catalyst with pH-Universal Oxygen Reduction Reaction Activity

Laser‐Irradiated Holey Graphene‐Supported Single‐Atom Catalyst towards Hydrogen Evolution and Oxygen Reduction

“…No other prominent peak is visible in each sample, indicating the high purity of our applied synthetic approach and fair short-time acid leaching process to remove extra unbounded metal residue contamination. [28] The deconvoluted high-resolution spectra of the NMGO sample are given in Figure S3b, Supporting Information. It shows wellfitted four individual peaks, including oxidized N, pyridinic-N, pyrrolic-N, and graphitic-N. [27,29] It has been reported that pyridinic N content promotes synthesized catalyst's catalytic activity.…”

Electrochemical transformation of Fe-N-C catalysts into iron oxides in alkaline medium and its impact on the oxygen reduction reaction activity

“…[24] Recently, we reported that, in alkaline electrolyte, catalysts based on metal NPs surrounded by a N-C shell (Metal@N-C, with Metal = Fe or Co) feature slightly higher ORR mass activity (MA) than some Metal-N-C catalysts with atomically-dispersed Metal-NxCy sites (metal = Fe, Co), [25] and carbon-supported Pt NPs (Pt/C). [26][27][28][29][30][31] The Fe-N-C materials are also tolerant to anodic fuels (such as alcohols and borohydride) [28,[31][32][33] and to common contaminants and impurities, which are present in reformed H2 or in air. [13,34] Thus, the interest in Metal-N-C catalysts for application in AEMFCs is rapidly rising, with recently reported high performance.…”

Mechanistic insights into metal, nitrogen doped carbon catalysts for oxygen reduction: progress in computational modeling

“…For example, Zhong et al reported that the experimental half-wave potential for ORR of Fe-N-C catalyst in alkaline (i.e., 0.916 V/RHE) was signicantly higher than that in acid (i.e., 0.748 V/RHE) and neutral media (i.e., 0.792 V/RHE), revealing signicant pH-dependent ORR performance of the Fe-N-C catalyst. 85 Failing to model the pH-dependent activity of M-N-C catalysts, the typical CHE computational method employs a metal/vacuum interface at zero charge to simulate a charged electrochemical interface at a constant potential and thus cannot account for the variation of the adsorption energy of chemical species as a function of pH value. In addition, accurate predictions of the experimental observables such as onset potential, half-wave potential, and Tafel slope are absent in the computational studies of M-N-C catalysts for ORR.…”