Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 1, Pages 186-195Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02730
Keywords
transition-metal phosphides; electrodeposition; supercapacitors; asymmetric supercapacitors; energy storage
Funding
- China Scholarship Council [201708370121, 201708120052]
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The Mn-CoP/NF electrode was successfully synthesized via electrodeposition, utilizing the synergistic effect between Mn and Co ions to enhance specific capacity, rate performance, and cycling stability. The electrode features rich electroactive sites and excellent structural stability, leading to high energy density and long-term durability in supercapacitor applications.
As the combined merits of structures and compositions could have a great impact on electrodes, we synthesized manganese-doped cobalt phosphide nanosheets on Ni foam (Mn-CoP/NF) via a facile electrodeposition method. The synergistic effect between Mn and Co ions provides mixed valence states and adjusts the bandgap for accelerating the high redox reaction kinetics and improving the electron mobility and electrical conductivity. Meanwhile, the nanosheet structure provides rich electroactive sites and excellent structural stability for facilitating the electron transfer and resisting structural damage. As expected, the obtained Mn-CoP/NF electrode acquired a superior specific capacity (456 C g(-1) at 0.5 A g(-1)), an excellent rate performance (77.4% capacity retention at 10 A g(-1)), and an excellent cyclability (89.0% capacity retention after 20,000 cycles). The Mn-CoP/NF//AC asymmetric supercapacitor (ASC) delivers a high energy density (14.82 W h kg(-1) at 312 W kg(-1)) and long-term durability (87.7% capacity retention after 20,000 cycles). Moreover, two ASC devices can be used to light an LED for 6 min, demonstrating ASC's promising practical applications.
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