期刊
NANO LETTERS
卷 14, 期 4, 页码 1870-1876出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl404640n
关键词
Metal-free electrocatalysts; gelatin; amphiphlilic; Ketjenblack; oxygen reduction reaction
类别
资金
- BK21 Plus
- Ministry of Education, Korea [10Z20130011057]
- next generation secondary battery R&D program of MKE/KEIT [10042575]
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education [2013R1A1A2007910]
Electrocatalysts facilitating oxygen reduction reaction (ORR) are vital components in advanced fuel cells and metal-air batteries. Here we report Ketjenblack incorporated nitrogen-doped carbon sheets derived from gelatin and apply these easily scalable materials as metal-free electrocatalysts for ORR. These carbon nanosheets demonstrate highly comparable catalytic activity for ORR as well as better durability than commercial Vulcan carbon supported Pt catalysts in alkaline media. Physico-chemical characterization and theoretical calculations suggest that proper combination of graphitic and pyridinic nitrogen species with more exposed edge sites effectively facilitates a formation of superoxide, [O-2(ad)](-), via one-electron transfer, thus increasing catalytic activities for ORR. Our results demonstrate a novel strategy to expose more nitrogen doped edge sites by irregular stacked small sheets in developing better electrocatalysts for Zn-air batteries. These desirable architectures are embodied by an amphiphlilic gelatin mediated compatible synthetic strategy between hydrophobic carbon and aqueous water.
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