Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 19, Pages 17482-17490Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04451
Keywords
sponge effect; SmMn2O5; N-doped graphene; bidentate adsorptions; Zn-air batteries
Funding
- National Key Research and Development Program [2016YFB0901600]
- Tianjin City Distinguish Young Scholar Fund
- National Natural Science Foundation of China [21573117, 11674289]
- 1000 Youth Talents Plan
- Fundamental Research Funds for the Central Universities [63185015]
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Exploring the effect of interfacial structural properties on catalytic performance of hybrid materials is essential in rationally designing novel electrocatalysts with high stability and activity. Here, in situ growth of mullite SmMn2O5 on nitrogen-doped reduced graphene oxide (SMO@NrGO) is achieved for highly efficient oxygen reduction reaction (ORR). Combining X-ray photoelectron spectroscopy and density functional theory calculations, interfacial chemical interactions between Mn and substrates are verified. Interestingly, as revealed by charge density difference, the interfacial Mn-N(C) bonds display a sponge effect to store and compensate electrons to boost the ORR process. In addition, bidentate adsorption of oxygen intermediates instead of monodentate ones is observed in hybrid materials, which facilitates the interactions between intermediates and active sites. Experimentally, the hybrid catalyst SMO@NrGO exhibits a half-wave potential as high as 0.84 V, being comparable to benchmark Pt/C and higher than that of the pure SMO (0.68 V). The Zn-air battery assembled with SMO@NrGO shows a high discharge peak power density of 244 mW cm(-2) and superior cycling stability against noble metals.
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