Bei Wang,Qiang Ru,Qing Guo,Xiaoqiu Chen,Zhen Wang,Xianhua Hou,Shejun Hu
Graphical Mesoporous 1D CoP nanorods were synthesized by a hydrothermal method and subsequent low-temperature phosphorization. As an anode for Li ion batteries, CoP delivers a high discharge capacity (894 mAh g –1 ; 300 cycles) at a current density of 500 mA g –1 . At a current density of 4000 mA g –1 , the rate capacity is 467 mAh g –1 , showing good reversible capacity, cycling stability, and rate capability. One-dimensional mesoporous CoP nanorods have been successfully synthesized via a facile hydrothermal method and subsequent low-temperature thermal phosphorization treatment. At a current density of 500 mA g –1 , CoP nanorods as anode materials for lithium ion batteries deliver a high discharge capacity of 894 mAh g –1 after 300 cycles, with a coulombic efficiency of over 99 %. Even at a high current rate of 4000 mA g –1 , the discharge capacity of the CoP electrode can still retain 467 mAh g –1 . The results suggest that the introduction of cobalt and the special mesoporous nanorods play important roles in enhancing the electrochemical properties. Therefore, this rodlike CoP electrode is competent as a promising anode material for high-performance lithium-ion batteries.
The rational construction of high-efficiency transition metal phosphides catalysts for hydrogen evolution reaction (HER) is crucial since their sluggish kinetics of water dissociation remain severe barriers for HER performance. The theoretical calculations indicate a unique adsorption-diffusion-decomposition mechanism for H 2 O molecules on CoP (111) surface. Herein, Fe could decrease H 2 O decomposition barrier energies and increase the amount of active sites, along with Cr could accelerate H 2 O adsorption, diffusion and increase the conductivity of the reaction surface. Aided by this mechanism, a self-supported electrode of Cr and Fe dual-doped CoP nanorod arrays grown on nickel foam was prepared. The electrode only requires an overpotential of 27 mV at 10 mA cm −2 for alkaline HER with excellent durability for 400 h. Moreover, the catalyst presents only 1.505 V at 10 mA cm −2 for alkaline water electrolysis. This work provides an in-depth understanding on catalytic mechanism of CoP-based materials.
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