In order to fabricate high-performance supercapacitors with desirable energy density and excellent cycling stability, this work aimed to synthesize biomass-derived carbon materials with great electrochemical performance, especially with superior long-term cycling stability, via a facile and simple process. Herein, we have fabricated three kinds of biomass-derived multi-heteroatom-doped carbon materials, using laver, soybean milk and soybean milk (Ag⁺) as the precursors, labeled as LC, SC and Ag-SC, respectively. The three heteroatom-doped carbon materials possessed extremely high cycling performance; after cycling for 50,000 times, the specific capacitances of LC and SC could maintain 119.8% and 96.0%, and the specific capacitance of Ag-SC could maintain 131.1% after cycling for 40,000 times. Additionally, the energy densities of the corresponding solid-state symmetric supercapacitors were 9.5, 6.2 and 6.9 Wh kg⁻¹ at the power density of about 900 W kg⁻¹, respectively, and the specific capacitances could retain 141.5%, 128.9% and 102.2% after 50,000 cycles.

中文翻译：

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生物质衍生的多杂原子掺杂碳材料，用于高性能固态对称超级电容器，具有出色的长期循环稳定性

为了制造具有期望的能量密度和出色的循环稳定性的高性能超级电容器，这项工作旨在通过一种简便易行的方法合成具有出色的电化学性能，尤其是具有长期长期稳定性的生物质衍生碳材料。在这里，我们用紫菜，豆浆和豆浆（Ag ⁺制成）制备了三种生物质衍生的多杂原子掺杂碳材料。）作为前体，分别标记为LC，SC和Ag-SC。三种杂原子掺杂的碳材料具有极高的循环性能。循环5万次后，LC和SC的比电容可以分别维持119.8％和96.0％，而Ag-SC的电容量在循环4万次后可以维持131.1％。另外，相应的固态对称超级电容器的能量密度分别为9.5，6.2和6.9瓦时千克^-1在约900瓦公斤的功率密度^-1，分别与所述特定电容可以保留141.5％，128.9％和102.2 50,000次循环后的％。