Polydopamine-induced surface functionalization of carbon nanofibers for Pd deposition enabling enhanced catalytic activity for the oxygen reduction and evolution reactions

Abstract

A detailed understanding of the surface modification or coating of materials is becoming more important for the design and development of hybrid materials for their advanced applications.

Synthesis and Characterization of Aero-Eutectic Graphite Obtained by Solidification and Its Application in Energy Storage: Cathodes for Lithium Oxygen Batteries

“…Notice that the twenty limited discharge-charge cycles at 1.2 mAh cm −2 gives an accumulated capacity of 24 mAh cm −2 , which is equivalent to conventional 48 cycles limited to 0.5 mAh cm −2 . Regarding to that, the reported value in this work is in the range of values reported that could be found in the vast literature of batteries: Pd/Carbon Nano Fibers hybrid material with different dopamine hydrochloride concentrations in the synthesis achieves 21, 33 and 49 cycles limited to 0.2 mAh cm −2 (current density 0.1 mA cm −2 ) [35]. Commercial carbon paper (SGL group, BC35) cathode reaches 10, 15 and 60 cycles limited to 0.52 mAh cm −2 without catalyzer, and with LiBr and RuBr 3 catalyzers, respectively (current density 0.1 mA cm −2 ) [36].…”

Copper–CNT interfacing with Cu-doped polydopamine in CNT carpet: copper nucleation and resistance decrease upon soft annealing

“…2a) features CNTs doped with nitrogen due to oxidation in nitric acid (peak at 400 AE 0.1 eV associated with C2-NH). [27][28][29][30] One can recall that in the CNT@Pda sample (Fig. 2b), the C2-NH (pyrrolic nitrogen) and C]N-C (pyridinic nitrogen) components feature cyclic units of Pda formed via the Michael addition reaction.…”

“…2c) features a peak at 398.8 eV attributed to nitrogen-copper interactions. 27,29,31 Interestingly, the relative contribution of the Cu-N component (Table 3) decreases upon annealing from 30.5% (CNT@PdaCu) to 20.2% (CNT@PdaCu annealed at 673 K) and towards 8.8% (CNT@PdaCu annealed at 773 K) meaning that the amount of Cu ions chelated in Pda decreases as the annealing temperature increases. In the Cu 2p spectra ( Fig.…”

Enteric pH responsive cargo release from PDA and PEG coated mesoporous silica nanoparticles: a comparative study inDrosophila melanogaster

“…In case of the PDA coated MSN sample, the N 1s spectrum clearly shows Table 1 Particle diameter and z potential values obtained from DLS measurements (also see Fig. SI-2 the presence of N-H bond with a distinct peak at 399.7 eV conrming the presence of an amine group 35,69,70 on the MSN surface which is clearly absent for both PEG coated and assynthesized MSN sample (Fig. 2B).…”