A Platelet Graphitic Nanofiber‐Carbon Nanotube Hybrid for Efficient Oxygen Evolution Reaction

Abstract

Carbon nanostructures with a high‐density of active sites are needed as catalysts for the oxygen evolution reaction (OER). Here we report a platelet graphitic nanofiber‐carbon nanotube (PGNF‐CNT) hybrid electrocatalyst prepared by chemical vapor deposition. The material is composed of interconnected CNTs and nanofibers consisting of graphitized carbon layers stacked at different angles to the fiber axis with a large number of exposed edges. These unique structural characteristics give the hybrid a high density of active sites, fast electron transfer and a large number of mass transport paths. As a result, the material has an excellent electrocatalytic activity for OER with an overpotential of 0.28 V at a current density of 10 mA cm−2, which is much better than those of Ir/C and previously‐reported carbonaceous catalysts.

Carbon Nanohybrids for Advanced Electronic Applications

“…This material contained graphitized carbon layers stacked at various angles to the fiber axis, with a large number of exposed edges. [ 126 ] These unique structural characteristics give the hybrid nanomaterial a better active site density, as well as faster ETs and a large number of mass transport paths. [ 126 ] The material also showed excellent electrocatalytic activity for OERs, with an overpotential of 0.28 V at a current density of 10 mA cm −2 .…”

“…[ 126 ] These unique structural characteristics give the hybrid nanomaterial a better active site density, as well as faster ETs and a large number of mass transport paths. [ 126 ] The material also showed excellent electrocatalytic activity for OERs, with an overpotential of 0.28 V at a current density of 10 mA cm −2 . This is considerably better than other reported carbonaceous catalysts.…”

In-situ growth of CeO2/Ce(OH)CO3 composites with enhanced photocatalytic activity by the incomplete conversion of CeO2 to Ce(OH)CO3

“…However, the rapid photogenerated electron-hole recombination efficiency and the severe agglomeration of CeO 2 greatly limit its photocatalytic efficiency [6]. A lot of strategies have been used to overcome the abovementioned issues, such as metal doping, nonmetal doping, metal-carbon supported materials [7][8][9] and so on. Among these strategies, coupling of semiconductors has been proven to be a practical and effective method to improve catalytic performance [10][11][12][13].…”

Fe-doped MoS2 nanosheets array for high-current-density seawater electrolysis

“…Previous works used both experiments and theories to confirm the layered transition-metal chalcogenides as promising candidates in electrocatalytic splitting of water because of their cost-effective and unique sandwich structure that exposes abundant active sites for HER [15][16][17][18][19][20][21][22][23][24][25]. Among them, MoS 2 -based materials [26][27][28][29][30][31][32] have been extensively investigated as efficient acidic HER electrocatalysts due to the atomic hydrogen adsorption free energy on the edge sites very close to zero that is comparable to Pt (state-of-the-art HER catalyst).…”