Data from: A novel adenine-based-MOF derived nitrogen-doped nanoporous carbon for flexible solid-state supercapacitor

In this article, we have synthesized a series of nitrogen-doped nanoporous carbon (NPC) from metal organic framework (MOF) of UiO-66 with different ratio of adenine and coated on carbon nanotube film (CNTF) to obtain a flexible porous electrode (NPC/CNTF). It is worth noting that the introduction of adenine at different ratio did not change the structure of UiO-66. We also investigated the effect of carbonization temperature from 800 to 1000 °C on the electrochemical properties of the NPC. The ratio (1, 4-benzendicarboxylate: adenine) 9:1 and the NPC carbonized at 900 °C (noted as NPC-1-900) exhibits better electrochemical properties. The results show that NPC-1-900/CNTF electrode exhibits an exceptionally areal capacitance of 121.5 mF cm-2 than that of PC-900/CNTF electrode (22.8 mF cm-2) at 5 mV s-1 in a three-electrode system, indicating that the incorporation of nitrogen is beneficial to the electrochemical properties of nanoporous carbon. A symmetric flexible solid-state supercapacitor of NPC-1-900/CNTF has also been assembled and tested. Electrochemical date shows that the device exhibited superior areal capacitance (43.2 mF cm-2) at the scan rate of 5 mV s-1, the volumetric energy density is 57.3 µWh cm-3 and the volumetric power density is 2.4 mW cm-3 at the current density of 0.5 mA cm-2 based on PVA/H3PO4 gel electrolyte. For practical application, we have also studied the bending tests of the device, which show that the device exhibits the outstanding mechanical stability under different bending angles. Furthermore, the flexible device shows excellent cyclic stability, which can retain 91.5% of the initial capacitance after 2000 cycles.

本研究以不同腺嘌呤比例的UiO-66型金属有机框架（MOF）为前驱体，合成了一系列氮掺杂纳米多孔碳（NPC），并将其负载于碳纳米管薄膜（CNTF）上，制备得到柔性多孔电极（NPC/CNTF）。值得注意的是，不同比例的腺嘌呤引入并未改变UiO-66的晶体结构。本研究还探究了800~1000℃范围内碳化温度对NPC电化学性能的影响。当1,4-苯二甲酸与腺嘌呤的比例为9:1、且碳化温度为900℃时所制备的NPC（记为NPC-1-900）展现出更优异的电化学性能。在三电极体系、扫速5 mV s⁻¹的条件下，NPC-1-900/CNTF电极的面电容可达121.5 mF cm⁻²，远高于未掺杂氮的PC-900/CNTF电极的22.8 mF cm⁻²，表明氮掺杂可有效改善纳米多孔碳的电化学性能。本研究还组装并测试了基于NPC-1-900/CNTF的对称型柔性固态超级电容器。电化学测试数据表明，在扫速5 mV s⁻¹下，该器件的面电容可达43.2 mF cm⁻²；以PVA/H3PO4凝胶为电解质，在电流密度0.5 mA cm⁻²时，其体积能量密度为57.3 µWh cm⁻³，体积功率密度为2.4 mW cm⁻³。针对实际应用场景，本研究还对该器件进行了弯折测试，结果显示其在不同弯折角度下均表现出优异的机械稳定性。此外，该柔性器件具备出色的循环稳定性，经过2000次循环后仍可保留初始电容的91.5%。