多孔炭电极的表面改性与优化是实现超级电容器优异性能的关键。本文以煤化学工业的固体副产物为碳源,利用二维层状双氢氧化物(MgAl-LDH)的刚性约束作用耦合KOH活化工艺成功制备了二维富氧多孔炭纳米材料(OPCN)。系统研究了炭化温度对OPC...多孔炭电极的表面改性与优化是实现超级电容器优异性能的关键。本文以煤化学工业的固体副产物为碳源,利用二维层状双氢氧化物(MgAl-LDH)的刚性约束作用耦合KOH活化工艺成功制备了二维富氧多孔炭纳米材料(OPCN)。系统研究了炭化温度对OPCN样品微观结构和表面特性的影响,通过SEM、TEM、氮气吸脱附测试以及元素分析等表征手段对炭材料的结构/组成和表面特性进行分析表明,经700℃炭化获得的炭材料样品(OPCN-700)具有较高的氧质量分数(24.4%)和大的比表面积(2388 m^(2) g^(-1)),并表现出良好的润湿性。同时,OPCN-700样品丰富的微孔和二维纳米片结构为电解质离子提供了有效的储存和传输途径。作为超级电容器的电极材料,在电流密度为0.5 A g^(-1)时,其比电容高达382 F g^(-1),并呈现出优异的倍率性能和循环稳定性。该技术策略为富氧原子掺杂二维多孔炭材料的可控制备与水系储能器件的设计构建提供了新思路。展开更多
Layered Double Hydroxides MgFe-LDH and MgAl-LDH have been prepared by th e method involving separate nucleation and ageing steps. The structure analyses for these two materials show that the values of the parameters b...Layered Double Hydroxides MgFe-LDH and MgAl-LDH have been prepared by th e method involving separate nucleation and ageing steps. The structure analyses for these two materials show that the values of the parameters both a and c of M gAl-LDH are smaller than that of MgFe-LDH though their structures are simila r, and MgAl-LDH with higher crystallinity is more easily formed than MgFe-LD H in the same preparing conditions. The IR analyses manifest that the structures of layer sheets and the orderings of the anions in the interlayer regions of Mg Al-LDH are more regular than that of MgFe-LDH. The temperature programmed XR D analyses reveal that the diffraction peak of 003 reflections for MgAl-LDH co uld be seen after calcining at 300℃, while this peak for MgFe-LDH disappears after calcining at 200℃. Together with the TG-DTA analysis it can be conclu ded that the thermal stability of MgAl-LDH is obviously higher than that of Mg Fe-LDH.展开更多
文摘多孔炭电极的表面改性与优化是实现超级电容器优异性能的关键。本文以煤化学工业的固体副产物为碳源,利用二维层状双氢氧化物(MgAl-LDH)的刚性约束作用耦合KOH活化工艺成功制备了二维富氧多孔炭纳米材料(OPCN)。系统研究了炭化温度对OPCN样品微观结构和表面特性的影响,通过SEM、TEM、氮气吸脱附测试以及元素分析等表征手段对炭材料的结构/组成和表面特性进行分析表明,经700℃炭化获得的炭材料样品(OPCN-700)具有较高的氧质量分数(24.4%)和大的比表面积(2388 m^(2) g^(-1)),并表现出良好的润湿性。同时,OPCN-700样品丰富的微孔和二维纳米片结构为电解质离子提供了有效的储存和传输途径。作为超级电容器的电极材料,在电流密度为0.5 A g^(-1)时,其比电容高达382 F g^(-1),并呈现出优异的倍率性能和循环稳定性。该技术策略为富氧原子掺杂二维多孔炭材料的可控制备与水系储能器件的设计构建提供了新思路。
文摘Layered Double Hydroxides MgFe-LDH and MgAl-LDH have been prepared by th e method involving separate nucleation and ageing steps. The structure analyses for these two materials show that the values of the parameters both a and c of M gAl-LDH are smaller than that of MgFe-LDH though their structures are simila r, and MgAl-LDH with higher crystallinity is more easily formed than MgFe-LD H in the same preparing conditions. The IR analyses manifest that the structures of layer sheets and the orderings of the anions in the interlayer regions of Mg Al-LDH are more regular than that of MgFe-LDH. The temperature programmed XR D analyses reveal that the diffraction peak of 003 reflections for MgAl-LDH co uld be seen after calcining at 300℃, while this peak for MgFe-LDH disappears after calcining at 200℃. Together with the TG-DTA analysis it can be conclu ded that the thermal stability of MgAl-LDH is obviously higher than that of Mg Fe-LDH.
