One Simple Strategy towards Nitrogen and Oxygen Codoped Carbon Nanotube for Efficient Electrocatalytic Oxygen Reduction and Evolution

Abstract

The development of advanced electrocatalysts for oxygen reduction and evolution is of paramount significance to fuel cells, water splitting, and metal-air batteries. Heteroatom-doped carbon materials have exhibited great promise because of their excellent electrical conductivity, abundance, and superior durability. Rationally optimizing active sites of doped carbons can remarkably enhance their electrocatalytic performance. In this study, nitrogen and oxygen codoped carbon nanotubes were readily synthesized from the pyrolysis of polydopamine-carbon nanotube hybrids. Different electron microscopes, Raman spectra and X-ray photoelectron spectroscopy (XPS) were employed to survey the morphological and componential properties. The newly-obtained catalyst features high-quality nitrogen and oxygen species, favourable porous structures and excellent electric conductivity, and thus exhibits remarkably bifunctional oxygen electrode activity. This research further helps to advance the knowledge of polydopamine and its potential applications as efficient electrocatalysts to replace noble metals.

Nanocomposite Cathode Catalysts Containing Platinum Deposited on Carbon Nanotubes Modified by O, N, and P Atoms

“…The mechanism of the oxygen reduction reaction on these catalysts does not change depending on the catalyst. In addition, since the values of the slopes are much lower than those observed for the polarization curves obtained on CNTs (more than 0.12 V per current decade [27]) prior to modification, it can be argued that there is an acceleration of the ORR and the rate of electron transfer to an oxygen molecule. This agrees well with the data on the increase in electrical conductivity: the lower slopes of the Tafel dependences correspond to the catalysts synthesized on CNTs, which contain nitrogen and phosphorus atoms in addition to oxygen.…”

Nickel nanoparticles supported on a covalent triazine framework as electrocatalyst for oxygen evolution reaction and oxygen reduction reactions

“…Deconvolution of the N 1s XPS spectrum of Ni/CTF-1-600-22 reveals five peaks at about 398.5, 399.3, 400.6, 401.2 and 402.3 eV, which can be assigned pyridinic nitrogen, Ni-coordinated nitrogen, pyrrolic nitrogen, graphitic or quaternary nitrogen and oxidized nitrogen, respectively [26,48]. The formation of pyridinic N and graphitic or quaternary N have been demonstrated to improve the activity of N-modified carbonbased materials such as N-doped ordered porous carbon and N-doped carbon nanotubes [49,50]. According to our evaluation of the XPS data, 8 atom % N is involved in bonding to Ni for Ni/CTF-1-400-20, whereas 7 atom % N is involved in bonding to Ni for Ni/CTF-1-600-22.…”

Functionalized Carbon Nanotubes Supported 3D Zinc/Cobalt Oxide as an Efficient Electrocatalyst for Oxygen Evolution Reaction

“…The as-synthesized ZnO/Co 3 O 4 @O-CNT catalyst showed a small overpotential and a Tafel slope value, which demonstrates improved electrocatalytic properties toward the OER performance, which is significantly better than that of the wellknown IrO 2 catalyst and recently reported OER catalysts, as presented in Table II. [26][27][28][29][30][31][32][33][34][35] The catalyst exhibited the highest ECSA and specific activity of 24.5 cm 2 and 0.13 mA cm −2 at an overpotential of 400 mV, and improved TOF (2.45 s −1 ), roughness factor (R f, 350), and current density in comparison with pristine materials at the same overpotential as shown in Table I and Fig. 6d.…”