A ternary B, N, P-Doped carbon material with suppressed water splitting activity for high-energy aqueous supercapacitors

摘要: Abstract Porous carbon materials (PCMs) have been extensively investigated as electrode for supercapacitors, yet are severely hindered by low capacitance and energy density. Herein, we reported the efficient synthesis of a ternary B, N, P-doped PCM (termed BNP-C) via polymer dehalogenation strategy. The atomic contents P, characterized XPS, 11.5, 1.1, 0.8%, respectively, intriguingly resulting in limited water splitting activity due to overwhelmingly presented B dopant. This specific feature can be taken advantage effectively expanding workable voltage window while maintaining large capacitances aqueous supercapacitors (ASCs). Besides, BNP-C exhibited porous 3D structure, hierarchical surface area 1118.5 m2 g−1, which simultaneously ensured BNP-C-assembled ASC with superior capacitive performance. As confirmed both Dunn Trasatti methods, pseudocapacitance remarkably contributed ∼44.9 ∼40.2% respectively overall BNP-C, was mainly credited heavy decoration B. In addition, symmetric delivered very good long-term stability high 12.0 10.9 Wh kg−1 acidic alkaline electrolytes, respectively.