School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University, Hangzhou 310027, PR China.
Dalton Trans. 2018 Nov 22;47(45):16320-16328. doi: 10.1039/c8dt03755h.
Transition metal phosphides (TMPs) represent an important class of compounds with metalloid characteristics and good electrical conductivity, which are of great benefit to enhance electrochemical performances. Thus it is important to clarify the correlation between the electrochemical properties and the phosphating degree of the precursor. Herein, we report a superior electrode for battery-like capacitors based on NiCo2O4/NiCoP hetero-structure nanoflake-nanowire arrays grown on nickel foams using a one-pot facile hydrothermal approach and a controllable phosphorization treatment method. The Ni-Co precursor nanoflake-nanowire array based electrode treated with 500 mg NaH2PO2 shows significantly improved electrochemical performances with an ultrahigh specific capacitance of 2288.8 F g-1 and 1644 F g-1 at a current density of 1 A g-1 and 20 A g-1, respectively. The electrode also shows superior cycling stability. In addition, the NiCo2O4/NiCoP//AC device exhibits a relatively high energy density of 35.5 W h kg-1 at 750.4 W kg-1. The results suggest that this NiCo2O4/NiCoP nanoflake-nanowire array is a promising electrode material for high performance hybrid supercapacitor applications.
过渡金属磷化物（TMPs）是一类具有类金属特性和良好导电性的重要化合物，这对提高电化学性能非常有益。因此，阐明电化学性能与前驱体磷化程度之间的关系非常重要。本文采用一步简便的水热法和可控磷化处理方法，在泡沫镍上生长 NiCo2O4/NiCoP 异质结构纳米片-纳米线阵列，报道了一种基于电池型超级电容器的优异电极。在 500mgNaH2PO2 处理下，基于 Ni-Co 前驱体纳米片-纳米线阵列的电极表现出显著改善的电化学性能，在 1Ag-1 和 20Ag-1 的电流密度下具有超高的比电容，分别为 2288.8F g-1 和 1644F g-1。该电极还表现出优异的循环稳定性。此外，NiCo2O4/NiCoP//AC 器件在 750.4Wkg-1 时具有相对较高的能量密度 35.5Whkg-1。结果表明，这种 NiCo2O4/NiCoP 纳米片-纳米线阵列是一种用于高性能混合超级电容器应用的有前途的电极材料。
