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Effect of Acid-Washing on the Nature of Bulk Characteristics of Nitrogen-Doped Carbon Nanostructures as Oxygen Reduction Reaction Electrocatalysts in Acidic Media
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-09-18 00:00:00 , DOI: 10.1021/acs.energyfuels.8b01510
Kuldeep Mamtani 1 , Deepika Singh 1 , Doruk Dogu 1 , Deeksha Jain 1 , Jean-Marc M. Millet 2 , Umit S. Ozkan 1
Affiliation  

CNx catalysts were synthesized using Fe-doped MgO as a growth substrate. The oxygen reduction reaction (ORR) performance of the synthesized samples was evaluated in a half-cell. Acid-washing improved the ORR activity for the synthesized CNx samples. This is attributed to the removal of the exposed metal, which is likely to be blocking the active sites. Characterization experiments suggest that acid-washing totally eliminates the support material (MgO) and renders carbon more graphitic. This is likely to be due to elimination of amorphous or less crystalline species during washing. In addition, characterization experiments reveal significant differences in the metallic species that are exposed versus those encased in the carbon nanostructure.

中文翻译:

酸洗对酸性介质中氧还原反应电催化剂氮掺杂碳纳米结构本体特性的影响

使用掺铁的MgO作为生长基质合成CN x催化剂。在半电池中评估了合成样品的氧还原反应(ORR)性能。酸洗改善了合成的CN x样品的ORR活性。这归因于去除了暴露的金属,这很可能会阻塞活性部位。表征实验表明,酸洗可完全消除载体材料(MgO),并使碳更具石墨性。这可能是由于在洗涤过程中消除了无定形或结晶度较低的物质。此外,表征实验还揭示了暴露的金属物种与包裹在碳纳米结构中的金属物种之间的显着差异。
更新日期:2018-09-18
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