P/N/O co-doped carbonaceous material based supercapacitor with voltage up to 1.9 V in aqueous electrolyte

Bifunctional biomass-derived N, S dual-doped ladder-like porous carbon for supercapacitor and oxygen reduction reaction

“…Meanwhile, the doping of N into carbon framework can improve the conductivity and wettability, and offer up a pseudocapacitance [50]. Besides, the oxygen species doped into carbon framework may improve the wettability of electrode interface, and contribute affluent faradic pseudocapacitance in aqueous electrolytes [51]. According to the GCD profiles in Fig.4b, NSLPC shows a capacitance of 214.5 F g -1 at 0.5 A g -1 , which is much higher than that of NLPC (185.5 F g -1 at 0.5 A g -1 ) and LPC (165 F g -1 at 0.5 A g -1 ).…”

Enhanced electrocatalytic performance of nitrogen‐ and phosphorous‐functionalized carbon felt electrode for VO 2 + / VO 2 + redox reaction

“…Co‐doping allows charge delocalization and introduces a larger asymmetrical spin and charge density on the carbon felt electrode as compared to the case of single doping 53 . Thus, as shown in Figure 7, the larger asymmetric spin and charge density induced by the formation of P‐N and P=N bonds enhance the rate of the VO 2+ /VO 2 + redox reaction by providing abundant adsorption sites for the positively charged active species such as VO 2+ or VO 2 + and thereby forming N‐V and P‐V transitional states 26,35,36,41,54,55 . Negatively charged nitrogen and phosphorus atoms can also form N‐V and P‐V transitional states, and thus offering additional active sites for the VO 2+ /VO 2 + redox reaction.…”

“…As shown in Figure 3E, the high-resolution C 1s spectrum of NPCF can be deconvoluted into four peaks at 284.8, 286, 287, and 289 eV, which correspond to C=C, C-OH/C-P/C-N, C=O/C=N, and OH-C=O, respectively. [37][38][39] Taking into account the presence of phosphorous, the high-resolution O 1s spectrum of NPCF ( Figure S1) can be deconvoluted into two peaks at around 531 and 533 eV, which are attributed to C=O/P=O/N=O and C-O/P-O/N-O, 18,[40][41][42] respectively. The high-resolution N 1s spectra of NCF ( Figure 4A) and NPCF ( Figure 4C) can be deconvoluted into four peaks at binding energies of 399, 400, 401.5, and 403 eV, which are mainly associated with pyridinic-N, pyrrolic-N, graphitic-N (also known as quaternary-N), and pyridine-N oxide, respectively.…”

“…The high-resolution N 1s spectra of NCF ( Figure 4A) and NPCF ( Figure 4C) can be deconvoluted into four peaks at binding energies of 399, 400, 401.5, and 403 eV, which are mainly associated with pyridinic-N, pyrrolic-N, graphitic-N (also known as quaternary-N), and pyridine-N oxide, respectively. 25,26,35,36,40,41,[43][44][45][46][47][48] The notable difference between the high-resolution N1s spectra of NPCF and NCF is that the relative intensity of the signals at 399 and 401.5 eV is higher in NPCF than in NCF. Recently, Wang et al have described that the binding energies of 398.3 and 401.2 eV correlate with F I G U R E 2 Field-emission scanning electron microscopy images of the surfaces of (A) bare carbon felt, (B) nitrogen-doped carbon felt, (C) phosphorus-doped carbon felt, and (D) N, P co-doped carbon felt at 5000× magnification pyridinic-N and quaternary-N as well as P=N and P-N bonds in the case of N and P co-doped carbon.…”

Evaluación de la capacidad de almacenamiento de energía en xerogeles de carbono activados obtenidos a partir lignina

“…El espectro N 1s solamente se evidenció en la muestra GA27 y está representado por tres energías de enlace: N-6 y N=P (~398,1eV), N-5 (~399. eV) y N-Q (~401.9 eV)[60]…”