Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 41, Pages 46695-46707Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c14780
Keywords
graphene-based cathode; hydrogen peroxide; oxygen reduction reaction; active oxygen-containing groups; oxygen mass transfer; contaminant removal
Funding
- National Natural Science Foundation of China
- Key Research Program of Nanjing IPE Institute of Green Manufacturing Industry
- [22078328]
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In this study, a carbonized CMC-rGO synthetic fabric cathode was designed and constructed to efficiently generate H2O2. The carbonized CMC exhibited abundant active carboxyl groups and excellent two-electron ORR activity, while the carbonized CMC-rGO synthetic fabric cathode improved the yield and current efficiency of H2O2 by creating meso/macroporous channels.
Cathodic catalytic activity and interfacial mass transfer are key factors for efficiently generating hydrogen peroxide (H2O2) via a two-electron oxygen reduction reaction (ORR). In this work, a carbonized carboxymethyl cellulose (CMC)-reduced graphene oxide (rGO) synthetic fabric cathode was designed and constructed to improve two-electron ORR activity and interfacial mass transfer. Carbonized CMC exhibits abundant active carboxyl groups and excellent two-electron ORR activity with an H2O2 selectivity of approximately 87%, higher than that of rGO and other commonly used carbonaceous catalysts. Carbonizing CMC and the agglomerates formed from it restrain the restacking of rGO sheets and thus create abundant meso/macroporous channels for the interfacial mass transfer of oxygen and H2O2. Thus, the as constructed carbonized CMC-rGO synthetic fabric cathode exhibits exceptional H2O2 electrosynthesis performance with 11.94 mg center dot h-1 center dot cm-2 yield and 82.32% current efficiency. The sufficient active sites and mass-transfer channels of the cathode also ensure its practical application performance at high current densities, which is further illustrated by the rapid organic pollutant degradation via the H2O2-based electro-Fenton process.
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