Nickel-iron selenide polyhedral nanocrystal with optimized surface morphology as a high-performance bifunctional electrocatalyst for overall water splitting
| Autor: | Jun-Ming Liu, Zhang Zhang, Guofu Zhou, Xingsen Gao, Pengfei Cheng, Hu Xianbiao, Shaoqiang Su, Xin Wang, Qingwei Zhou |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Electrolysis
Materials science Electrolysis of water Oxygen evolution General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences Cathode 0104 chemical sciences Surfaces Coatings and Films Anode law.invention chemistry.chemical_compound chemistry Chemical engineering law Water splitting 0210 nano-technology Bifunctional |
| Zdroj: | Applied Surface Science. 488:326-334 |
| ISSN: | 0169-4332 |
| Popis: | Constructing earth-abundant and efficient electrocatalysts for overall water splitting are still in the research and exploration stage. In this work, the Fe-doped NiSe2 polyhedron nanocrystals grown on Ni foam (Ni0.75Fe0.25Se2@NF) with controllable surface morphology are developed as high-performance bifunctional electrocatalysts. The surfaces of the optimized polyhedron nanocrystals provide high density of catalytic active sites. NiSe2 is originally a catalytic active substance, and the Fe doping in NiSe2 can greatly enhance the conductivity. The optimized Ni0.75Fe0.25Se2@NF (6 h) electrode are performed in an alkaline solution, exhibiting outstanding OER and HER activity with small overpotentials of 210 mV and −117 mV to reach current density of 10 mA cm−2 and −10 mA cm−2, respectively. Remarkably, the Ni0.75Fe0.25Se2@NF (6 h) electrode serve as cathode and anode in water splitting electrolyzer also demonstrates highly efficient overall water electrolysis performance, with a relatively low cell voltage of 1.61 V at 10 mA cm−2 (1.57 V for RuO2(+)//Pt/C(−) couple) and excellent long-term stability of 50 h for overall water electrolysis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect