Volume 40 Issue 2
Feb.  2023
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CHEN Yingyu, LIU Yijun, CHEN Chenxin, et al. Room temperature preparation of NiFe-phytic acid composite and its electrocatalytic performance for overall water splitting[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 893-903. doi: 10.13801/j.cnki.fhclxb.20220314.002
Citation: CHEN Yingyu, LIU Yijun, CHEN Chenxin, et al. Room temperature preparation of NiFe-phytic acid composite and its electrocatalytic performance for overall water splitting[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 893-903. doi: 10.13801/j.cnki.fhclxb.20220314.002

Room temperature preparation of NiFe-phytic acid composite and its electrocatalytic performance for overall water splitting

doi: 10.13801/j.cnki.fhclxb.20220314.002
Funds:  National Natural Science Fund (20805041); Natural Science Foundation of Fujian Province (2019J05108)
  • Received Date: 2022-01-06
  • Accepted Date: 2022-03-05
  • Rev Recd Date: 2022-02-20
  • Available Online: 2022-03-18
  • Publish Date: 2023-02-15
  • The preparation of bifunctional catalysts with high stability and high activity for hydrogen production from water is one of the important step in the large-scale commercial application of hydrogen energy. Herein, the flake amorphous phytic acid-nickel iron bimetallic composite (NiFe-PA) has been prepared on foamed nickel (NF) by two-step room temperature impregnation using phytic acid (PA), ferric chloride hexahydrate (FeCl3·6H2O) and nickel chloride hexahydrate (NiCl2·6H2O) as the starting materials. The electrocatalytic performance of NiFe-PA modified NF electrode (NiFe-PA/NF) for water electrolysis in alkaline condition (1.0 mol/L KOH) was investigated by linear sweep voltammetry (LSV). The results show that NiFe-PA/NF, as a bifunctional catalyst, has excellent oxygen and hydrogen evolution properties due to the synergistic effect between Ni and Fe. The overpotentials are only 220 mV at 50 mA·cm−2 for oxygen evolution reaction (OER) and 135 mV at 10 mA·cm−2 hydrogen evolution reaction (HER). The NiFe-PA/NFs were then assembled into a two-electrode system for overall water splitting, and the cell voltage required to reach the current density of 10 mA·cm−2 was only 1.61 V, which is lower than the precious metal catalyst system of RuO2/NF||Pt-C/NF (1.64 V). It can also satisfy the hydrogen production driven by solar panels (2 V) under solar illumination conditions. Furthermore, owing to the high stability and corrosion resistance of the PA-metal complex, the catalytic stability of NiFe-PA/NF can be maintained at least for 175 h and 75 h, respectively, for the OER and HER at 100 mA·cm−2, indicating the high catalytic stability of NiFe-PA/NF at high current densities.


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