Waste Biomass Based‐Activated Carbons Derived from Soybean Pods as Electrode Materials for High‐Performance Supercapacitors,ChemistrySelect

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Waste Biomass Based‐Activated Carbons Derived from Soybean Pods as Electrode Materials for High‐Performance Supercapacitors
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-06-01 , DOI: 10.1002/slct.201800609
Zhi Liu ₁ , Zhi Zhu ₁ , Jiangdong Dai ₁ , Yongsheng Yan ₁

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In this paper, a simple yet effective chemical activation/carbonization strategy is presented to prepare a hierarchically porous activated carbon with multi‐heteroatom (O, N, and P) self‐doping using waste soybean pods as carbon source. It is found that the resulting carbon activated by KOH possesses richer textural properties than the one activated by ZnCl₂. With abundant micro‐, mesopores and interconnected macropores, the KOH‐activating carbon possesses a specific surface area up to 2245 m² g⁻¹ and a large pore volume of 1.35 cm³ g⁻¹. In a three‐electrode system, the KOH‐activating carbon can deliver a high specific capacitance of 321.1 F g⁻¹ at a current density of 1 A g⁻¹ in 6 M KOH aqueous electrolyte. It still can maintain 215.7 F g⁻¹ at a current density of 10 A g⁻¹ with a good rate capacity (67.2% retention). When used as symmetric electrode in 1 M Na₂SO₄ neutral aqueous solution, the SPAC−K//SPAC−K supercapacitor can provide a high energy density up to 22.28 Wh kg⁻¹ at a power density of 450 W kg⁻¹ in a wide voltage window of 0–2.0 V, surpassing most of the previously reported waste biomass‐based carbon materials. The impressive electrochemical performances as well as the low‐cost scalable production manifest that the SPAC−K derived from waste soybean pods can be a promising electrode candidate for supercapacitor application.

中文翻译：

大豆荚废生物质基活性炭作为高性能超级电容器的电极材料

本文提出了一种简单而有效的化学活化/碳化策略，以废豆荚为碳源，制备具有多杂原子（O，N和P）自掺杂的分级多孔活性炭。发现由KOH活化的所得碳具有比由ZnCl ₂活化的碳更丰富的织构性质。具有丰富的微孔，中孔和相互连接的大孔，KOH活化碳的比表面积高达2245 m ² g ^-1，大孔体积为1.35 cm ³ g ^-1。在三电极系统中，KOH活化碳可以在1 A g的电流密度下提供321.1 F g ^-1的高比电容^-1在6 M KOH水性电解质中。在电流密度为10 A g ^-1时，它仍可以保持215.7 F g ^-1的速率，并具有良好的倍率容量（保留率为67.2％）。当在1 M Na ₂ SO ₄中性水溶液中用作对称电极时，SPAC-K // SPAC-K超级电容器可在450 W kg ^-1 in的功率密度下提供高达22.28 Wh kg ^-1的高能量密度。 0-2.0 V的宽电压范围，超过了以前报道的大多数基于废物生物质的碳材料。令人印象深刻的电化学性能以及低成本可扩展的生产表明，源自废豆荚的SPAC-K可以成为超级电容器应用的有希望的电极候选者。

更新日期：2018-06-01

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