O/N Co‐Doped, Layered Porous Carbon with Mesoporosity up to 99 % for Ultrahigh‐Rate Capability Supercapacitors,Batteries & Supercaps

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O/N Co‐Doped, Layered Porous Carbon with Mesoporosity up to 99 % for Ultrahigh‐Rate Capability Supercapacitors
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-06-08 , DOI: 10.1002/batt.202000037
Bei Liu ₁ , Jikai Wen ₁ , Hongbiao Chen ₁ , Mei Yang ₁ , Yijang Liu ₁ , Huaming Li _{1,

2}

Affiliation

Ultrahigh‐rate capability supercapacitors that can tolerate charging/discharging at ultrahigh current density are particularly attractive for high‐power applications. At present, mesopore‐engineering and heteroatom‐doping have been proven to be the effective ways for concurrently enhancing energy density and rate capability. Herein, we report the fabrication of O/N‐co‐doped mesoporous carbons with ultrahigh mesoporosity and well‐defined mesopores by one‐step Na₂CO₃‐activation of covalent triazine‐based frameworks that derive from 2,4,6‐tris(4‐cyanophenoxy)‐1,3,5‐triazine monomer (CTFO) at 800–1000 °C. The as‐obtained O/N‐co‐doped carbon (CTFC‐900) with up to 99 % mesoporosity possesses a layered structure together with a high specific surface area (2425 m² g⁻¹) and a high N/O content (6.98 at% N and 10.32 at% O). Owing to these merits, the supercapacitor based on CTFC‐900 electrode exhibited a high specific capacitance of 287 F g⁻¹ at 1.0 A g⁻¹ and an ultrahigh rate capability of 66.1 % at 1–1000 A g⁻¹ in alkaline electrolyte. Moreover, the CTFC‐900‐based supercapacitor in neutral electrolyte achieved both high energy density (32.2 Wh kg⁻¹) and high power density (187 kW kg⁻¹).

中文翻译：

O / N共掺杂层状多孔碳，介孔率高达99％，适用于超高容量超级电容器

能够承受超高电流密度下的充电/放电的超高速率能力超级电容器对于大功率应用特别有吸引力。目前，中孔工程和杂原子掺杂已被证明是同时提高能量密度和速率能力的有效方法。本文中，我们报告了通过对源自2,4,6-tris的共价三嗪基骨架进行一步Na ₂ CO ₃活化，制备具有超高介孔性和定义明确的介孔的O / N掺杂介孔碳。（4-氰基苯氧基）-1,3,5-三嗪单体（CTFO）在800-1000°C下。介孔率高达99％的O / N掺杂碳（CTFC-900）具有层状结构和高比表面积（2425 m ² g^-1）和高N / O含量（6.98 at％N和10.32 at％O）。由于这些优点，基于CTFC-900电极的超级电容器在1.0 A g ^-1下显示出287 F g ^-1的高比电容，在1–1000 A g ^-1下在碱性电解液中显示出66.1％的超高倍率能力。此外，中性电解液中基于CTFC‐900的超级电容器实现了高能量密度（32.2 Wh kg ^-1）和高功率密度（187 kW kg ^-1）。

更新日期：2020-06-08

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