Unravelling Charge-transfer in Pd to pyrrolic-N bond for superior electrocatalytic performance

Sahoo, Lipipuspa, Mondal, Sanjit, Gloskovskii, A. , Chutia, Arunabhiram and Gautam, Ujjal K. (2021) Unravelling Charge-transfer in Pd to pyrrolic-N bond for superior electrocatalytic performance. J. Materials Chemistry A . ISSN 0959-9428

Full content URL: https://doi.org/10.1039/D0TA12618G

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Unravelling Charge-transfer in Pd to pyrrolic-N bond for superior electrocatalytic performance
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Abstract

Fuel cells require large quantities of Pt for oxygen reduction reaction (ORR) to subvert the activity-loss during prolonged use. Pd can complement Pt in the near future by exhibiting a similar activity and stability in alkaline fuel cells. Herein we show that by depositing Pd atom-by-atom on an N-doped reduced graphene oxide (NRGO), it is possible to create a strong bond between Pd and pyrrolic-fraction of the N-moieties. This bond further strengthens in the presence of an by a from the Pd 3d-orbitals to the 2p-orbitals of C, N and O, thereby lowering the Pd- 3d binding-energy and the resulting Pd/NRGO exhibits a very high ORR activity (E1/2 = 0.93 V vs. RHE) and stability (∆E1/2 = 0.013 V after 15000. Usually pyridinic-N is considered for imparting high-performance while N-doping creates nearly as many pyrrolic-N in graphene-substrates, the role of which is evidenced in this study.

Keywords:oxygen reduction reaction, N-doped reduced graphene oxide, Fuel cells
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
ID Code:44572
Deposited On:13 Apr 2021 14:52

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