Novel collagen waste derived Mn-doped nitrogen-containing carbon for supercapacitors

Highlights: • A novel metal ion chelation strategy was used to prepare heteroatom-doped carbon materials. • Mn-doped N-containing carbon material was fabricated based on collagen waste obtained from leather processing. • Mn/N-C-800 exhibited a high specific capacitance of 272.62 F g⁻¹. • Mn/N-C-800 showed favorable stability under extreme temperature. • This kind of Mn/N-C-x represented an alternative promising candidate for an efficient electrode material for supercapacitors. Heteroatom doped carbon originated from natural and renewable biomass has recently attracted tremendous attention related to electrode material of supercapacitors. Herein, we reported a practical and facile strategy to synthesize Mn-doped N-containing carbon materials based on collagen waste obtained from leather processing for supercapacitors, and this method was applicable to most metals. Mn-doped N-containing carbon was fabricated primarily by chelating metal ions with bayberry tannin immobilized collagen fiber, followed by a carbonization treatment. The as-prepared Mn-doped N-containing carbon material exhibited a high specific capacitance (272.62 F g⁻¹ at the current density of 1.0 A g⁻¹), high rate capability (72.21% capacitance retention with increasing current density from 1 to 20 A g⁻¹), and after 6000 cycles remained 81.4%. Especially, it showed favorable thermal stability under extreme conditions (264.9 F g⁻¹ and 262.65 F g⁻¹ at 60 °C and 0 °C water bath under the current density of 1 A g⁻¹, respectively). The results indicated that Mn-doped N-containing carbon was a practically potential electrode material for supercapacitors.