Graphitized Nanodiamond as Highly Efficient Support of Electrocatalysts for Oxygen Reduction Reaction

Abstract

Graphitized nanodiamond (GND) with a nanodiamond (ND) core covered by a graphitic shell was used as a stable support of platinum (Pt) electrocatalysts for oxygen reduction reaction (ORR). ND particles were annealed at 1300 and 1600 • C in a vacuum of 10 −3 Pa, and a graphitic shell formed on ND's surface (GND1300, GND1600). The core-shell structure improves ND's conductivity and also retains its high electrochemical stability. GND supported Pt electrocatalysts were prepared using a microwave heating polyol method. The catalytic activity of Pt/GND1600 for ORR was better than traditional Vulcan XC-72 carbon supported Pt (Pt/C) catalysts. The accelerated durability test results showed that the Pt/GND1600 had greater stability in comparison to Pt/GND1300 and Pt/C, which was ascribed to the high stability of the GND1600 support in acid solution and strong interaction with Pt NPs.

Nanodiamond/nitrogen-doped graphene (core/shell) as an effective and stable metal-free electrocatalyst for oxygen reduction reaction

“…After 1000 voltage cycles, the CV curve of ND/N-G showed no significant changes, indicating a high antioxidation of the ND/N-G in alkaline solution. This was attributed to the core-shell structure of ND/N-G [19,20,23]. As shown in Fig.…”

“…The special graphene nanosheets were made of a 3D material via thermal conversion of sp3 structure carbon atoms of the ND surface, in which no metals were used as the catalysts. The retained diamond core with high morphological stability under oxidizing conditions provides a stiff support for the graphene shell [19,20]. Due to the core-shell structure of ND/N-G, the stacking could be weakened.…”

Palladium Supported on Nanodiamonds as an Efficient Catalyst for the Hydrogenating Deamination of Benzonitrile and Related Compounds

“…[16] Metal nanoparticles on nanodiamonds have been recently used for developing nanomedicines, [17] as electrocatalyst in fuel cells, [18] and in the oxygen reduction reaction. [19] Palladium NPs supported on nanodiamonds exhibit enhanced activity towards the hydrogenation [20] of the C=Ca nd C Cb onds. They were also used in the hydrogenation [21] of cyclohexene, allyl alcohol, nitrobenzene, azomethines, allyl alcohol, and simultaneously for the reductive amination of propanal [22] with 4-aminobenzoica cid.…”

Influence of the preparation method on Pt3Cu/C electrocatalysts for the oxygen reduction reaction

“…On the other hand, particular consideration and extensive attention of researchers have been given to PEMFCs due to their environmental friendly characteristics, high power density and low operation temperature [1][2][3][4][5][6][7][8][9][10][11][12][13]. Currently carbon supported Pt nanoparticles are extensively used as electrocatalysts in PEMFCs.…”