Main content area

A highly pyridinic N-doped carbon from macroalgae with multifunctional use toward CO2 capture and electrochemical applications

Ren, Meng, Zhang, Tianyun, Wang, Ying, Jia, Ziyang, Cai, Jinjun
Journal of materials science 2019 v.54 no.2 pp. 1606-1615
Ulva prolifera, X-ray photoelectron spectroscopy, adsorption, capacitance, carbon, carbon dioxide, catalysts, durability, electrochemistry, electrodes, heat, hydrothermal carbonization, macroalgae, melamine, methanol, nitrogen, potassium hydroxide, scanning electron microscopy, surface area, wastes
A highly pyridinic N-doped carbon with total N-species of ~ 15.5 at.% and surface area of ~ 1100 m²/g was obtained from marine biowaste, Enteromorpha prolifera, via hydrothermal carbonization and a mild KOH activation, using melamine as nitrogen source. This offers a simple pathway for large-scale synthesis of N-doped carbon with partial spheres verified from X-ray photoelectron spectroscopy and scanning electron microscopy, showing great perspective in multifunctional activities for carbon capture, oxygen reduction reaction, and supercapacitor. The carbon shows CO₂ uptake of ~ 3 mmol/g under ambient conditions with isosteric heat of adsorption up to 40 kJ/mol, in addition to a large capacitance of 214 F/g at 0.5 A/g in 6 M KOH as electrode for supercapacitor. The supercapacitor exhibits superior cycling durability of 98% retention at 2 A/g after 10,000 cycles. Furthermore, the carbon as catalyst also exhibits good stability and resistance to methanol crossover as compared to commercial Pt/C catalyst, followed with a dominant 4e⁻ transfer process.