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Scalable neutral H2O2 electrosynthesis by platinum diphosphide nanocrystals by regulating oxygen reduction reaction pathways
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Scalable neutral H2O2 electrosynthesis by platinum diphosphide nanocrystals by regulating oxygen reduction reaction pathways
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Journal Article
Scalable neutral H2O2 electrosynthesis by platinum diphosphide nanocrystals by regulating oxygen reduction reaction pathways
2020
Overview
Despite progress in small scale electrocatalytic production of hydrogen peroxide (H
2
O
2
) using a rotating ring-disk electrode, further work is needed to develop a non-toxic, selective, and stable O
2
-to-H
2
O
2
electrocatalyst for realizing continuous on-site production of neutral hydrogen peroxide. We report ultrasmall and monodisperse colloidal PtP
2
nanocrystals that achieve H
2
O
2
production at near zero-overpotential with near unity H
2
O
2
selectivity at 0.27 V vs. RHE. Density functional theory calculations indicate that P promotes hydrogenation of OOH* to H
2
O
2
by weakening the Pt-OOH* bond and suppressing the dissociative OOH* to O* pathway. Atomic layer deposition of Al
2
O
3
prevents NC aggregation and enables application in a polymer electrolyte membrane fuel cell (PEMFC) with a maximum r(H
2
O
2
) 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 H
2
O
2
concentration in 600 mL of 3.0 wt% (pH = 6.6).
The synthesis of high concentration H
2
O
2
from water and oxygen at moderate conditions could provide an on-site H
2
O
2
source for medical and water purification applications. Here, authors show Al
2
O
3
-stabilized PtP
2
nanocrystals to enable selective, stable and efficient neutral pH H
2
O
2
production.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
