The formation of spherical mesocrystalline microparticles (FA-Ni) was achieved through the self-assembly between folic acid and nickel ions. Such favorable structure and the existence of abundant active sites within FA-Ni were responsible for the high specific capacitance (912 F g⁻¹ at 0.5 A g⁻¹) and energy density (27.81 Wh kg⁻¹) of the material when used as a supercapacitor. Meanwhile, the as-synthesized FA-Ni showed excellent stability (97.6% capacitance retention over 8000 cycles at 10 A g⁻¹). This facile method would be expected to benefit for the preparation of mesocrystals based on biological ligands and their use as the promising electrode materials for high performance supercapacitors.

通过叶酸和镍离子之间的自组装实现了球形介晶微粒（FA-Ni）的形成。这种有利的结构和丰富的活性位点的FA-Ni系中的存在分别负责高的比电容（912 F G ^-1 0.5 A G ^-1）和能量密度（瓦27.81千克^-1作为使用时的材料的）超级电容器。同时，如此合成的FA-Ni表现出优异的稳定性（在10 A g ^-1的8000次循环中97.6％的电容保持率）。这种简便的方法有望有益于基于生物配体的介晶的制备及其作为高性能超级电容器的有希望的电极材料的用途。