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Scalable neutral H2O2 electrosynthesis by platinum diphosphide nanocrystals by regulating oxygen reduction reaction pathways

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abstract
Despite progress in small scale electrocatalytic production of hydrogen peroxide (H2O2) using a rotating ring-disk electrode, further work is needed to develop a non-toxic, selective, and stable O2-to-H2O2 electrocatalyst for realizing continuous on-site production of neutral hydrogen peroxide. We report ultrasmall and monodisperse colloidal PtP2 nanocrystals that achieve H2O2 production at near zero-overpotential with near unity H2O2 selectivity at 0.27 V vs. RHE. Density functional theory calculations indicate that P promotes hydrogenation of OOH* to H2O2 by weakening the Pt-OOH* bond and suppressing the dissociative OOH* to O* pathway. Atomic layer deposition of Al2O3 prevents NC aggregation and enables application in a polymer electrolyte membrane fuel cell (PEMFC) with a maximum r(H2O2) of 2.26 mmol h−1 cm−2 and a current efficiency of 78.8% even at a high current density of 150 mA cm−2. Catalyst stability enables an accumulated neutral H2O2 concentration in 600 mL of 3.0 wt% (pH = 6.6).
subject
H2O2 electrosynthesis
contributor
Geyer, S. (author)
date
2021-03-22T12:44:04Z (accessioned)
2021-03-22T12:44:04Z (available)
2020-08-06 (issued)
identifier
Li, Hui, Peng Wen, Dominique S. Itanze, Zachary D. Hood, Shiba Adhikari, Chang Lu, Xiao Ma et al. "Scalable neutral H 2 O 2 electrosynthesis by platinum diphosphide nanocrystals by regulating oxygen reduction reaction pathways." Nature communications 11, no. 1 (2020): 1-12. (citation)
https://doi.org/10.1038/s41467-020-17584-9 (doi)
http://hdl.handle.net/10339/98582 (uri)
language
en (iso)
publisher
SpringerNature
source
Nature Communications
title
Scalable neutral H2O2 electrosynthesis by platinum diphosphide nanocrystals by regulating oxygen reduction reaction pathways
type
Article

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