Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 2, Pages 1951-1960Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b03370
Keywords
Thermal decomposition; Biomass; Graphene; Nitrogen doping; Electrocatalysts; Oxygen reduction reaction
Categories
Funding
- National Key Research and Development Program of China [2016YFB0700204]
- Natural Science Foundation of Jiangsu Province [BK20140472]
- NSFC [51602332]
- Science and Technology Commission of Shanghai Municipality [15520720400, 15YF1413800, 14DZ2261203, 16DZ2260603]
- One Hundred Talent Plan of Chinese Academy of Sciences
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We successfully developed a thermally decomposable template route to prepare wrinkled carbon nanosheets with a high level of nitrogen functional moieties by direct carbonization of biomass glucose and dicyandiamide as the renewable feedstocks. Confined pyrolysis of glucose within the interlayers of dicyandiamide-derived g-C3N4 as a thermally removable template results in the formation of two-dimensional (2D) wrinkled carbon nanosheets as well as simultaneous high-level nitrogen doping. The textural properties and nitrogen contents could be controlled by adjusting the mass ratio of glucose/dicyandiamide. Among various samples, the sample prepared with the dicyandiamide/glucose mass ratio of 7/1 has optimal activity for the electrocatalytic oxygen reduction (onset potential -0.12 V vs saturated calomel electrode (SCE); limiting current density 4.73 mA/cm(2)) in 0.1 M KOH solution, the half-wave potential of which is only 67 mV larger than that for 20 wt % Pt/C. Moreover, it demonstrates a highly efficient four-electron reaction process, as well as superior durability and tolerance to MeOH crossover to Pt/C. The excellent activity is mainly attributed to the high content of pyridinic and graphitic-N groups, highly graphitized structures, and wrinkled 2D nanostructures, efficiently promoting the increased exposure of actives sites and fast mass/electron transfer.
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