Ultrafast Electrodeposition of Ni-Fe Hydroxide Nanosheets on Nickel Foam as Oxygen Evolution Anode for Energy-Saving Electrolysis of Na2CO3/ NaHCO3

作者：Sun, Yanzhi^*; Liu, Chunxiang; Zhang, Linying; Wan, Pingyu; Zhuang, Shuxian; Tang, Yang^*; Chen, Yongmei; Pan, Junqing

来源：ChemElectroChem, 2017, 4(5): 1044-1050.

DOI：10.1002/celc.201600713

• oxygen evolution reaction
• Ni-Fe hydroxide nanosheets
• electrodeposition
• electrocatalysis
• carbon dioxide

Nickel/iron (Ni-Fe)-based compounds are known as active electrocatalysts for the oxygen evolution reaction (OER), which plays an important role in metal-air batteries and water splitting. Herein, a three-dimensional (3D) porous nickel foam electrode (NiFe(OH)(x) NSs/Ni-f) modified with Ni-Fe hydroxide nanosheets (NSs) is prepared by using a fast and facile electrodeposition method. The electrode is subsequently applied in the electrolysis of Na2CO/NaHCO3 to produce hydrogen, oxygen, NaOH, and NaHCO3/CO2. By carefully controlling the electrodeposition time, ultrathin NiFe(OH) x NSs with a thickness of approximately 2-6 nm are interlaced with one another and grown vertically on nickel foam to form a hierarchical composite electrode. The prepared NiFe(OH)(x) NSs/Nif electrode exhibits superb OER performance with an overpotential of 260 mV at 10 mAcm(-2) and a low Tafel slope of 29 mVdec(-1) in 1 molL(-1) NaOH solution. In 0.5 molL(-1) Na2CO3/NaHCO3 solution, the NiFe (OH)(x) NSs/Nif electrode exhibits a low OER potential of 290 mV, which is lower than the commercial RuO2/Ti electrode at a current density of 100 mAcm(-2), and shows good long-term stability. During electrolysis of Na2CO3/NaHCO3, the cell voltage with the NiFe(OH)(x) NSs/Nif anode is 2.52 V, which is 280 mV lower than that with a commercial RuO2/Ti anode.

• 出版日期2017-5
• 单位北京化工大学