中文摘要：

研究分别以Mg-Al-LDH，Zn-Cr—LDH和Mg—Cr-LDH为模板，海藻酸钠为前驱体在600℃下炭化制备的多孔炭发现，多孔炭的BET比表面积从173m^2／g增加到497m^2／g，而海藻酸钠自身炭化所得多孔炭的比表面积仅为95m^2/g。电化学研究表明，以Mg-Cr—LDH为模板制备的多孔炭（PC-4）电极的循环伏安曲线图形更接近矩形，阴极和阳极过程基本对称；在恒电流充放电实验中，50mA／g的电流密度下PC-4电极的电容为92F／g且电流密度为500mA／g时充放电循环1000次后电容损失小于1％。比表面积、孔结构和电化学研究表明，海藻酸钠修饰LDH制备的多孔炭具有作为超级电容器电极材料的潜在价值。

英文摘要：

Porous carbon samples were prepared by carbonization of alginate biopolymer and alginate- modified layered double hydroxides （LDHs） and characterized using physisorption of nitrogen at liquid-nitrogen temperature,cyclic voltammogram （CV）, and galvanostatic charge-discharge techniques. The porous carbon electrode made of seaweed biopolymer-modified Mg-Cr-LDH displayed a rectangular shape and symmetrical anode and cathode processes with a specific capacitance of 92 F/g derived from the galvanostatic charge- discharge curve at a current density of 50 mA/g. The sample also shows a good stability and capacitance retainability with the capacitance decreased less than 1% after 1 000 cycles at a current density of 500 mA/ g. The experimental results show that porous carbon derived from alginate-modified layered double hydroxides is a potential supercapacitor electrode.