Jin Lu, Ting Song, Yan Chen, Suyun Xu, Pinjing He, Hua Zhang
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The addition of melamine markedly increased the surface area to 3474.1 m<sup>2</sup> g<sup>−1</sup> and the mesopore volume proportion to 72.9%‒77.3% in the HPCs. The crystal structure and functional groups of the HPCs were revealed by X-ray diffractometer, Raman spectrometry, and X-ray photoelectron spectrometry, indicating that LA-HPCs-N0.5 is a promising electrode material for supercapacitors. This material presented excellent capacitance storage performance and cycling stability, with a specific capacitance of 430.2 F g<sup>−1</sup> at 1 A g<sup>−1</sup> in a 6 mol L<sup>−1</sup> KOH electrolyte system, and the capacitance retention rate was 86.5% after 2000 cycles of charging and discharging at 10 A g<sup>−1</sup>. This study has successfully demonstrated that the template-free preparation of N-doped HPCs from waste oil is feasible, economical, and sustainable.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"6 4","pages":"473 - 486"},"PeriodicalIF":0.0000,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Template-free approach to fabricate uniformly N-doped hierarchical porous carbons from waste oil\",\"authors\":\"Jin Lu, Ting Song, Yan Chen, Suyun Xu, Pinjing He, Hua Zhang\",\"doi\":\"10.1007/s42768-024-00210-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The rational pore structure and abundant surface functional groups of hierarchical porous carbons (HPCs) are important for their practical application in supercapacitors. The liquid linoleic acid and solid melamine were thoroughly mixed and subjected to carbonization under autogenic pressure at elevated temperatures (CAPET), followed by KOH activation, to produce uniformly N-doped HPCs. The structure and surface chemical properties are controlled by adjusting the N-doped ratio. This adjustment results in high conductivity, abundant ion-accessible surfaces, hierarchical porosity with appropriate micro-mesoporous channels, as well as the presence of N and O heteroatoms. The addition of melamine markedly increased the surface area to 3474.1 m<sup>2</sup> g<sup>−1</sup> and the mesopore volume proportion to 72.9%‒77.3% in the HPCs. The crystal structure and functional groups of the HPCs were revealed by X-ray diffractometer, Raman spectrometry, and X-ray photoelectron spectrometry, indicating that LA-HPCs-N0.5 is a promising electrode material for supercapacitors. This material presented excellent capacitance storage performance and cycling stability, with a specific capacitance of 430.2 F g<sup>−1</sup> at 1 A g<sup>−1</sup> in a 6 mol L<sup>−1</sup> KOH electrolyte system, and the capacitance retention rate was 86.5% after 2000 cycles of charging and discharging at 10 A g<sup>−1</sup>. 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引用次数: 0
摘要
分层多孔碳(HPC)合理的孔隙结构和丰富的表面官能团对其在超级电容器中的实际应用非常重要。将液态亚油酸和固态三聚氰胺充分混合,在高温自生压力下进行碳化(CAPET),然后用 KOH 活化,制备出均匀掺杂 N 的 HPCs。通过调整掺氮比例,可控制其结构和表面化学特性。这种调整可产生高导电性、丰富的离子可及表面、具有适当微多孔通道的分层孔隙率以及 N 和 O 杂原子的存在。添加三聚氰胺后,HPCs 的表面积明显增加到 3474.1 m2 g-1,介孔体积比例增加到 72.9%-77.3% 。X射线衍射仪、拉曼光谱和X射线光电子能谱揭示了HPCs的晶体结构和官能团,表明LA-HPCs-N0.5是一种很有前途的超级电容器电极材料。在 6 mol L-1 KOH 电解液体系中,1 A g-1 时的比电容为 430.2 F g-1,在 10 A g-1 下充放电 2000 次后,电容保持率为 86.5%。这项研究成功证明了利用废油无模板制备掺杂 N 的 HPCs 是可行、经济和可持续的。
Template-free approach to fabricate uniformly N-doped hierarchical porous carbons from waste oil
The rational pore structure and abundant surface functional groups of hierarchical porous carbons (HPCs) are important for their practical application in supercapacitors. The liquid linoleic acid and solid melamine were thoroughly mixed and subjected to carbonization under autogenic pressure at elevated temperatures (CAPET), followed by KOH activation, to produce uniformly N-doped HPCs. The structure and surface chemical properties are controlled by adjusting the N-doped ratio. This adjustment results in high conductivity, abundant ion-accessible surfaces, hierarchical porosity with appropriate micro-mesoporous channels, as well as the presence of N and O heteroatoms. The addition of melamine markedly increased the surface area to 3474.1 m2 g−1 and the mesopore volume proportion to 72.9%‒77.3% in the HPCs. The crystal structure and functional groups of the HPCs were revealed by X-ray diffractometer, Raman spectrometry, and X-ray photoelectron spectrometry, indicating that LA-HPCs-N0.5 is a promising electrode material for supercapacitors. This material presented excellent capacitance storage performance and cycling stability, with a specific capacitance of 430.2 F g−1 at 1 A g−1 in a 6 mol L−1 KOH electrolyte system, and the capacitance retention rate was 86.5% after 2000 cycles of charging and discharging at 10 A g−1. This study has successfully demonstrated that the template-free preparation of N-doped HPCs from waste oil is feasible, economical, and sustainable.