Graphene nanomaterials supported palladium nanoparticles as nanocatalysts for electro-oxidation of methanol

Preparation of carbon dots-metal nanoparticles nanocomposites and their application in heterogeneous catalysis

“…A few literatures briefly mentioned purification methods. Most of them only performed simple centrifugation separation on the nanocomposites [62,63,66,76,83,[95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111]. Through comparison, it was found that the supernatant of CDs was collected as the product during the preparation of CDs, while the precipitate of the nanocomposites was centrifuged as the product during the preparation of nanocomposites.…”

“…Feng et al prepared Co/N-CQDs nanocomposites [117]. Both the N 1 s x-ray photoelectron spectroscopy (XPS) spectrum and the high-resolution Co 2p 3/2 spectrum detected the presence of Co-N species, which indicated that Co bonded with N-CQDs through coordination with N. Li et al prepared N-GQDs/Pd composites [102]. FTIR spectroscopy showed that compared with N-GQDs, the band corresponding to the N-H stretching in N-GQDs/Pd has shifted, which indicated that Pd is bonded to N. The N 1 s peak of N-GQDs/Pd in XPS showed higher binding energy (BE) compared with that of N-GQDs, which indicated that N transferred electrons to Pd.…”

“…On the other hand, CQDs boosted the electron transfer between Pt and methanol, which reduced the electrode resistance. Pd-CQDs nanocomposite was also prepared, whose electron transfer was also promoted by the interaction between Pd and CQDs [102]. Bimetallic NPs and nanocomposites with complicated structures were also applied.…”

Hydroquinone colorimetric sensing based on core–shell structured CoFe2O4@N-GQDs@CeO2 nanocomposites as oxidase mimics

“…Additionally, the abundant hydrophilic functional groups on their surface facilitate the formation of stable chemical bonds with other materials. 34 For example, Muriol et al prepared MnO 2 /GQD composites using a hydrothermal method where GQDs provided functional groups and specific surface area to enhance oxidase-mimicking activity. 35 Shi et al successfully enhanced the peroxidase-like catalytic properties of Fe 3 O 4 /N-GQDs by utilizing N-GQDs as reducing and stabilizing agents.…”