Electrolyte-Controlled Oxygen Reduction Reaction Via High-Performance Nanoconfined Pt–N 4 –C 8 Assay

Key Points

Pt–N4–C8–SOOH demonstrated an overpotential of only 36 ± 8 mV at 10 mA cm–2, showcasing high catalytic efficiency.
At 5 M H2SO4 and 5 wt % metal loading, the mass activity was measured at 112.8 Ag1–, indicating promising performance.
Chronoamperometry showed sustained activity for over 200 hours, with minimal overpotential increase—Δη ≈ 12–18 mV—at varied current densities.
The findings indicate significant enhancements in turnover frequency and reproducibility across different batches of the catalyst.

Abstract

The atomically dispersed Pt–N4–C8–X with metal loaded (0 to 10 wt %) and the H2SO4 concentration from 5 to 10 M tunes the structure and intermediate adsorption energetics (*O2, *OOH, *OH, and *O), demonstrating superior acidic ORR activity. Pt–N4–C8–SOOH achieved 36 ± 8 mV and 173 ± 10 mV overpotentials at 10 and 100 mA cm–2, respectively, for 5 M H2SO4, 5 wt % metal loading, exhibiting j0 ≈ 2.05 mA cm–2, Tafel slope (≈72 mV dec–1), 112.8 Ag1– mass activity, and up to 3.1-fold TOF enhancements. Chronoamperometry confirms sustained activity for >200 h with minimal overpotential increase (Δη ≈ 12–18 mV) at 10–100 mA cm–2, while maintaining reproducibility across batches.

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Cite This Study

Chidi et al. (Wed,) studied this question.

synapsesocial.com/papers/69a7675bbadf0bb9e87e09f4 https://doi.org/https://doi.org/10.1021/acsanm.5c05232

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