Cobalt, Ferrum Co-Doped Ni<sub>3</sub>Se<sub>4</sub> Nano-Flake Array: An Efficient Electrocatalyst for the Alkaline Hydrogen Evolution and Overall Water Splitting
oleh: Chuancang Zhou, Hongyu Wu, Feipeng Zhang, Yigao Miao
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-05-01 |
Deskripsi
Herein, Co, Fe co-doped Ni<sub>3</sub>Se<sub>4</sub> nano-flake array (Ni<sub>0.62</sub>Co<sub>0.35</sub>Fe<sub>0.03</sub>)<sub>3</sub>Se<sub>4</sub>) was prepared on conductive carbon cloth by a two-step hydrothermal method. XRD and EDX analysis show that the nanosheets are monoclinic Ni<sub>3</sub>Se<sub>4</sub>, and Co, and Fe were doped into the lattice of Ni<sub>3</sub>Se<sub>4</sub>. Electrochemical tests showed that Co, Fe co-doping can effectively improve the hydrogen evolution activity of Ni<sub>3</sub>Se<sub>4</sub> in acidic and alkaline environment. When the current density of (Ni<sub>0.62</sub>Co<sub>0.35</sub>Fe<sub>0.03</sub>)<sub>3</sub>Se<sub>4</sub>/CC is 10 mA/cm<sup>2</sup> in 1 M KOH solution, the overpotentials of hydrogen evolution and oxygen evolution are 87 mV and 53.9 mV, respectively, and the Tafel slopes are 122.6 and 262 mV/dec. The electrochemical active area test (ECSA) and the polarization curve test further show that (Ni<sub>0.62</sub>Co<sub>0.35</sub>Fe<sub>0.03</sub>)<sub>3</sub>Se<sub>4</sub>/CC has a larger electrochemical active area (34.8 mF/cm<sup>2</sup>), lower electrolytic potential (0.9 V at 10 mA/cm<sup>2</sup>) and better stability. Therefore, the novel bifunctional catalyst synthesized by a simple method is a promising candidate for large-scale industrial water electrolysis.