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Abstract：
Transition metal carbide nanocrystalline M3C (M: Fe, Co, Ni) encapsulated in graphitic shells supported with vertically aligned graphene nanoribbons (VA-GNRs) are synthesized through a hot filament chemical vapor deposition (HF-CVD) method. The process is based on the direct reaction between iron group metals (Fe, Co, Ni) and carbon source, which are facilely get high purity carbide nanocrystals (NCs) and avoid any other impurity at relatively low temperature. The M3C-GNRs exhibit superior enhanced electrocatalystic activity for oxygen reduction reaction (ORR), including low Tafel slope (39, 41, and 45 mV dec(-1) for Fe3C-GNRs, Co3C-GNRs, and Ni3C-GNRs, respectively), positive onset potential (similar to 0.8 V), high electron transfer number (similar to 4), and long-term stability (no obvious drop after 20 000 s test). The M3C-GNRs catalyst also exhibits remarkable hydrogen evolution reaction (HER) activity with a large cathodic current density of 166.6, 79.6, and 116.4 mA cm(-2) at an overpotential of 200 mV, low onset overpotential of 32, 41, and 35 mV, small Tafel slope of 46, 57, and 54 mV dec(-1) for Fe3C-GNRs, Co3C-GNRs, and Ni3C-GNRs, respectively, as well as an excellent stability in acidic media.
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ACS NANO
ISSN： 1936-0851
Year： 2015
Issue： 7
Volume： 9
Page： 7407-7418
1 7 . 1 0 0
JCR@2022
ESI Discipline： CHEMISTRY;
ESI HC Threshold：253
JCR Journal Grade：1
CAS Journal Grade：1
Cited Count：
WoS CC Cited Count： 438
SCOPUS Cited Count： 460
ESI Highly Cited Papers on the List： 40 Unfold All
WanFang Cited Count：
Chinese Cited Count：
30 Days PV： 10
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