In:
Energy & Environmental Science, Royal Society of Chemistry (RSC), Vol. 16, No. 8 ( 2023), p. 3526-3533
Abstract:
The two-electron oxygen reduction reaction (2e − ORR) in neutral media is a promising method to achieve hydrogen peroxide (H 2 O 2 ) from oxygen (O 2 ) directly in a sustainable way. Here, we show an ideal ZnO@ZnO 2 electrocatalyst for efficient O 2 reduction to H 2 O 2 in a neutral medium. The in situ growth of ZnO 2 on ZnO forms the operation active sites, namely the heterogeneous interface between tetrahedral ZnO and octahedral ZnO 2 , weakening the binding energies of both OOH* and O*. In a 0.1 M K 2 SO 4 electrolyte, ZnO@ZnO 2 shows a H 2 O 2 selectivity of nearly 100.0% via the ORR, while it can convert O 2 to H 2 O 2 with a production rate of 5.47 mol g cat −1 h −1 at 0.1 V vs. RHE and a Faraday efficiency (FE) of ∼95.5%, tested using a gas diffusion electrode device. The pulse voltage-induced current (PVC) was utilized in conjunction with a number of in situ characterization techniques and electrochemical studies to disclose the transformation of the ZnO surface and the production process of operational catalytic active sites on ZnO.
Type of Medium:
Online Resource
ISSN:
1754-5692
,
1754-5706
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2439879-2
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