Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 33, Pages 21431-21439Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04189
Keywords
Cu; N-codoped porous carbon; pyridinic N; hierarchical pores; ORR
Funding
- NSF of China [21576008, 91334203]
- Fundamental Research Funds for the Central Universities [buctrc201530]
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It remains a huge challenge to develop nonprecious electrocatalysts with high activity to substitute commercial Pt catalysts for oxygen reduction reactions (ORR). Here, the Cu,N-codoped hierarchical porous carbon (Cu-N-C) with a high content of pyridinic N was synthesized by carbonizing Cu containing ZIF-8. Results indicate that Cu-N-C shows excellent ORR electrocatalyst properties. First of all, it nearly follows the four-electron route, and its electron transfer number reaches 3.92 at -0.4 V. Second, both the onset potential and limited current density of Cu-N-C are almost equal to those of a commercial Pt/C catalyst. Third, it exhibits a better half-wave potential (similar to 16 mV) than a commercial Pt/C catalyst. More importantly, the Cu-N-C displays better stability and methanol tolerance than the Pt/C catalyst. All of these good properties are attributed to hierarchical structure, high pyridinic N content, and the synergism of Cu and N dopants. The metal-N codoping strategy can significantly enhance the activity of electrocatalysts, and it will provide reference for the design of novel N-doped porous carbon ORR catalysts.
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