PtAu Nanoparticles Supported by Reduced Graphene Oxide as a Highly Active Catalyst for Hydrogen Evolution

Abstract

PtAu nanoparticles spontaneously deposited on graphene support, PtAu/rGO, have shown remarkably high catalytic activity for hydrogen evolution reaction (HER) in sulfuric acid solution. SEM images of the PtAu/rGO electrode surface showed that Pt nanoparticles that are non-uniform in size occupy both the edges of previously deposited uniform Au nanoparticles and the edges of graphene support. XPS analysis showed that the atomic percentages of Au and Pt in PtAu/rGO were 0.6% and 0.3%, respectively. The atomic percentage of Au alone on previously prepared Au/rGO was 0.7%. Outstanding HER activity was achieved for the PtAu/rGO electrode, showing the initial potential close to the equilibrium potential for HER and a low Tafel slope of −38 mV/dec. This was confirmed by electrochemical impedance spectroscopy. The chronoamperometric measurement performed for 40 min for hydrogen evolution at a constant potential indicated good stability and durability of the PtAu/rGO electrode.

Interface-Engineered Porous Pt–PdO Nanostructures for Highly Efficient Hydrogen Evolution and Oxidation Reactions in Base and Acid

“…Several strategies have been investigated to further enhance the catalytic activity and durability of Pt-based catalysts in alkaline media, such as the use of transition metals Ni, − Co, − Pd, Ru, , Ir, Au, , Ag, and so forth along with Pt, Pt–metal hydroxide, Pt–metal oxide, ,, and so forth. However, their activity and durability are still lower to commercialize in an alkaline medium.…”

Graphene-Based Field-Effect Transistor for Ultrasensitive Immunosensing of SARS-CoV-2 Spike S1 Antigen

“…In the survey spectra of both graphene and graphene/Ab, photoelectron lines for C 1s and O 1s confirm the presence of C and O. 48 , 49 Graphene/Ab has an additional line for N 1s, which further confirms the presence of nitrogen of antibody bound with graphene Figure 2 c(i,ii). Different steps of bioconjugation of graphene with S1-Ab and interaction of the Ab–Ag complex are depicted in Figure 2 d.…”

Reduced graphene oxide-supported CuO nanoparticles with synergistically enhanced electrocatalytic activity for nitric oxide sensing

“…7,35 These supports provide a platform with a large specific surface area for the deposition and growth of CuO, as well as the synergistic effect between the supports and the CuO, leading to improved catalytic performance for NO sensing. 36,37 Reduced graphene oxide (rGO) with a two-dimensional (2D) sp 2 hybridized carbon monolayer structure reveals unique characteristics such as good conductivity, large specific surface area, and remarkable electronic properties. 33,34,[37][38][39] As a common support for carbon-based materials, rGO has been extensively incorporated into a variety of metal oxide nanomaterials such as ZnO, Fe 2 O 3 , CuO, SnO 2 Fe 3 O 4 , Co 3 O 4 , and TiO 2 .…”

“…36,37 Reduced graphene oxide (rGO) with a two-dimensional (2D) sp 2 hybridized carbon monolayer structure reveals unique characteristics such as good conductivity, large specific surface area, and remarkable electronic properties. 33,34,[37][38][39] As a common support for carbon-based materials, rGO has been extensively incorporated into a variety of metal oxide nanomaterials such as ZnO, Fe 2 O 3 , CuO, SnO 2 Fe 3 O 4 , Co 3 O 4 , and TiO 2 . 36,40,41 To date, copper oxide nanostructures loaded on carbon-based materials have been reported for sensing a variety of gases, such as NO 2 , NO, CO, CO 2 , NH 3 , etc., 30,35,36,38,42 but they are all used for the conversion and removal of these gases in the environment.…”

“…7,35 These supports provide a platform with a large specific surface area for the deposition and growth of CuO, as well as the synergistic effect between the supports and the CuO, leading to improved catalytic performance for NO sensing. 36,37…”