Abstract Effective utilization of waste biomass has been a fascinating topic for the development of sustainable energy. An effective alkaline hydrothermal/pyrolysis process was designed to prepare highly porous carbons noted as HK-PSC800 using waste Platanus acerifolia seeds as precursors. A symmetric supercapacitor (SSC) device based the same two HK-PSC800 electrodes owns the high specific energy density (30.9 Wh kg−1 at a low power density of 500 W kg−1) with excellent rate capability. To further optimize the energy density of the device, two types of asymmetric supercapacitors (ASC) with a working potential window of 1.5 V are designed and assembled by using HK-PSC800 and Co3O4 derived from zeolitic imidazolate framework-67 as electrode materials. The specific energy density of as-fabricated ASC (Co3O4//HK-PSC800) with pure Co3O4 materials as the positive electrode is nearly the same as the SSC (HK-PSC800//HK-PSC800). However, the specific energy density of the other ASC (Co3O4@HK-PSC800//HK-PSC800) can be improved by 18.8% when 28 wt% Co3O4 is in-situ grown in HK-PSC800 as the positive electrode. This research proves that the suitable composition of ASC electrode materials helps us to develop biomass based carbons materials for application in the high-voltage and high-energy devices.

中文翻译：

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以梧桐种子和ZIF-67为前驱体组装的不对称超级电容器的设计和优化

摘要 废弃生物质的有效利用一直是可持续能源发展的重要课题。设计了一种有效的碱性水热/热解工艺，以使用废弃的梧桐籽作为前体来制备称为 HK-PSC800 的高度多孔碳。基于相同的两个 HK-PSC800 电极的对称超级电容器 (SSC) 器件具有高比能量密度（30.9 Wh kg-1，500 W kg-1 的低功率密度）和出色的倍率性能。为了进一步优化器件的能量密度，使用 HK-PSC800 和来自沸石咪唑骨架-67 的 Co3O4 作为电极材料，设计并组装了两种工作电位窗口为 1.5 V 的非对称超级电容器 (ASC)。以纯 Co3O4 材料为正极的制造的 ASC（Co3O4//HK-PSC800）的比能量密度与 SSC（HK-PSC800//HK-PSC800）几乎相同。然而，当在 HK-PSC800 中原位生长 28 wt% 的 Co3O4 作为正极时，另一种 ASC（Co3O4@HK-PSC800//HK-PSC800）的比能量密度可以提高 18.8%。该研究证明，ASC电极材料的合适组成有助于我们开发生物质基碳材料，用于高压和高能设备。