Meihua Huang

Sulfur and Nitrogen Co-Doped, Few-Layered Graphene Oxide as a Highly Efficient Electrocatalyst for the Oxygen-Reduction Reaction

S and N co-doped, few-layered graphene oxide is synthesized by using pyrimidine and thiophene as precursors for the application of the oxygen reduction reaction (ORR). The dual-doped catalyst with pyrrolic/graphitic N-dominant structures exhibits competitive catalytic activity (10.0 mA cm(-2) kinetic-limiting current density at -0.25 V) that is superior to that for mono N-doped carbon nanomaterials. This is because of a synergetic effect of N and S co-doping. Furthermore, the dual-doped catalyst also shows an efficient four-electron-dominant ORR process, which has excellent methanol tolerance and improved durability in comparison to commercial Pt/C catalysts.

Iron phthalocyanine coated on single-walled carbon nanotubes composite for the oxygen reduction reaction in alkaline media

Iron (II) phthalocyanine coated on single-walled carbon nanotubes was synthesized as a non-noble electrocatalyst for the oxygen reduction reaction (ORR). The composite exhibited higher activity than the commercial Pt/C catalyst, and excellent anti-crossover effect for methanol oxidation in the ORR.

Highly dispersive Pt atoms on the surface of RuNi nanoparticles with remarkably enhanced catalytic performance for ethanol oxidation

A simple method for the preparation of highly dispersive Pt atoms on the surface of RuNi nanoparticles is developed by the deposition of Pt on single-walled carbon nanotube supported RuNi nanoparticles. The anodic peak current density of the nanocomposite is 8.0 times higher than that of Pt/C for ethanol oxidation, and it has a significantly lower onset potential than Pt/C for ethanol oxidation.

Pt2SnCu nanoalloy with surface enrichment of Pt defects and SnO2 for highly efficient electrooxidation of ethanol

We artfully synthesized Pt defects and SnO2 on the surface of a carbon-supported Pt2SnCu nanoalloy (Pt2SnCu–O-A/C) by in situ surface oxidation and acid treatment. The Pt2SnCu–O-A/C modified in this way exhibits excellent electrocatalytic activities for the ethanol oxidation reaction (EOR) in comparison to the commercial Pt/C and PtRu/C. The surface activity and mass activity are, respectively, 3.1 and 4.3 times greater than those of Pt/C. The enhanced activity for ethanol oxidation is attributed to the synergistic catalytic effect of Pt defects and SnO2.

Conductive Porous Network of Metal-Organic Frameworks Derived Cobalt-Nitrogen-doped Carbon with the Assistance of Carbon Nanohorns as Electrocatalysts for Zinc-Air Batteries

Herein, we report a new electrocatalyst for the oxygen reduction reaction derived from a bimetallic metal–organic framework and single‐walled carbon nanohorns. Owing to the 3D conductive network offered by the nanohorns, this type of catalyst exhibits comparable performance with the commercial 20 % Pt/C catalyst as well as excellent durability and methanol tolerance at the half‐cell test in an alkaline medium. Moreover, the new electrocatalyst shows higher peak power density (185 mW cm−2) than that of Pt/C (160 mW cm−2) in addition to a comparable stability in a real Zn–air battery test. A correlation between the value of the peak power densities and pore structures of some parallel samples is studied in detail.

Pt Nanoparticles Densely Coated on SnO2-Covered Multiwalled Carbon Nanotubes with Excellent Electrocatalytic Activity and Stability for Methanol Oxidation

A new electrocatalyst exhibiting enhanced activity and stability is designed from SnO2-covered multiwalled carbon nanotubes coated with 85 wt % ratio Pt nanoparticles (NPs). This catalyst showed a mass activity 6.2 times as active as that of the commercial Pt/C for methanol oxidation, owing to the unique one-dimensional structure. Moreover, the durability and antipoisoning ability were also improved greatly. The enhanced intrinsic performance was ascribed to the densely connected networks of Pt NPs on the SnO2 NPs.