Wang Jieni, Han Xiaobo, Zhang Shuqin, Hou Haodong, Wei Chenlin, Liu Chenxiao, Cao Leichang, Zhang Jinglai, Wang Li, Zhang Shicheng
Henan Key Laboratory of Protection and Safety Energy Storage for Light Metal Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, China.
Miami College, Henan University, Kaifeng 475004, China.
Int J Mol Sci. 2025 Jan 10;26(2):569. doi: 10.3390/ijms26020569.
It is challenging to handle heavy-metal-rich plants that grow in contaminated soil. The role of heavy metals in biomass on the physicochemical structure and electrochemical properties of their derived carbon has not been considered in previous research. In this study, Cu-ion hybrid nanoporous carbon (CHNC) is prepared from Cu content-contaminated biomass through subcritical hydrocharization (HTC) coupling pyrolytic activation processes. The CHNCs are used as advanced electrode material for energy storage applications, exhibiting an impressively ultrahigh capacitance of 562 F g at a current density of 1 A g (CHNC-700-4-25), excellent energy density of 26.15 W h kg, and only 7.59% capacitance loss after enduring 10,000 cycles at a current density of 10 A g, making CHNCs rank in the forefront of previously known carbon-based supercapacitor materials. These comprehensive characterizations demonstrate that copper ions introduce new electrochemically active sites and enhance the conductivity and charge transport performance of the electrode material, elevating the specific capacitance of CHNC from 463 to 562 F g. These findings offer valuable insights into the effective energy storage application of heavy-metal-contaminated biomass wastes.
处理生长在受污染土壤中的富含重金属的植物具有挑战性。以往的研究尚未考虑重金属在生物质中对其衍生碳的物理化学结构和电化学性质的作用。在本研究中，通过亚临界水热碳化（HTC）耦合热解活化过程，由含铜量受污染的生物质制备了铜离子混合纳米多孔碳（CHNC）。CHNC被用作储能应用的先进电极材料，在1 A g的电流密度下表现出令人印象深刻的562 F g的超高电容（CHNC-700-4-25），具有26.15 W h kg的优异能量密度，并且在10 A g的电流密度下经受10000次循环后电容损失仅为7.59%，使CHNC在先前已知的碳基超级电容器材料中名列前茅。这些综合表征表明，铜离子引入了新的电化学活性位点，提高了电极材料的导电性和电荷传输性能，将CHNC的比电容从463提高到562 F g。这些发现为重金属污染生物质废物的有效储能应用提供了有价值的见解。
