【摘要】 利用水热法一步合成了不同镍、钴元素比例的镍钴铝层状氢氧化物（NiCoAl LDH）,并探究了不同Ni元素含量的NiCoAl LDH的电化学性能,在Ni和Co的物质的量之比为3:7时,Ni_0.3CoAl LDH具有最优电化学性能。晶格中部分Ni元素被Co元素代替有利于降低氧化电势,提高材料的化学可逆性。然后通过水热法将CNT与Ni_0.3CoAl LDH复合,CNT的复合提高了材料的导电性。CNT/Ni_0.3CoAl LDH在1 A·g^-1的电流密度下比容量为1 332 F·g^-1,电流密度为10 A·g^-1时比容量保持率为60.4%。在5A·g^-1的电流密度下循环3 000圈容量保持率为87.6%。更多还原

【Abstract】 One-step synthesis of NiCoAl-layered double hydroxide（NiCoAl LDH） with different ratios of nickel and cobalt by hydrothermal method, and the electrochemical performance of NiCoAl LDH with different contents of Ni in nickel and cobalt metal elements were investigated. Ni_0.3CoAl LDH materials have the best electrochemical performance when the molar ratio of Ni to Co was 3∶7. Part of Ni element in the lattice was replaced by Co element,which is helpful to reduce the oxidation potential and improve the chemical reversibility of the material. Then the CNT/Ni_0.3CoAl LDH composite was synthesized by hydrothermal method, and the carbon nanotubes improved the conductivity of the material. At a current density of 1 A·g^-1, the specific capacitance of CNT/Ni_0.3CoAl LDH was as high as 1 332 F·g^-1. When the current density was increased to 10 A·g^-1, the capacity retention can reach 60.4%,and the CNT/Ni_0.3CoAl LDH electrode still exhibited an cycling stability with 87.6% retention at a current density of5 A·g^-1 for 3 000 cycles.更多还原