J. Mater. Sci. Technol. ›› 2020, Vol. 37: 154-160.DOI: 10.1016/j.jmst.2019.06.021
• Research Article • Previous Articles Next Articles
Wenbo Lia, Qingfeng Hua, Yunwei Liua, Mengmeng Zhanga, Jiajun Wangb, Xiaopeng Hana, Cheng Zhonga, Wenbin Hua, Yida Denga*()
Received:
2019-05-23
Revised:
2019-06-15
Accepted:
2019-06-29
Published:
2020-01-15
Online:
2020-02-10
Contact:
Deng Yida
Wenbo Li, Qingfeng Hu, Yunwei Liu, Mengmeng Zhang, Jiajun Wang, Xiaopeng Han, Cheng Zhong, Wenbin Hu, Yida Deng. Powder metallurgy synthesis of porous Ni-Fe alloy for oxygen evolution reaction and overall water splitting[J]. J. Mater. Sci. Technol., 2020, 37: 154-160.
Fig. 2. (a) XRD pattern of porous Ni8Fe2 alloy, (b) the corresponding enlarged plots of XRD pattern with the range of 40°-50°, (c) HRTEM image of porous Ni8Fe2 alloy, (d, e, f) SEM images of porous Ni8Fe2 alloy, pure Ni and pure Fe and (g) SEM image and the corresponding elemental mapping of porous Ni8Fe2 alloy (Ni and Fe).
Fig. 4. (a) OER polarization curves of different samples (iR-corrected), (b) potential values for different current density after ECSA normalization, (c) Tafel curves of different samples, (d) Nyquist plots at 1.567?V for OER, (e) polarization curves of porous Ni8Fe2 alloy before and after 1500 cycles with the potential range from 1.067 to 1.867?V and (f) the corresponding chronopotentiometry curve of the Ni8Fe2 porous alloy at the constant current density of 10?mA?cm-2.
Catalyst | Overpotential @10?mA?cm-2 (mV) | Overpotential @50?mA?cm-2 (mV) | Tafel slope (mV?dec-1) | Rct (Ω) | Cdl (mF?cm-2) |
---|---|---|---|---|---|
Porous Ni8Fe2 alloy | 269 | 298 | 42.5 | 1.01 | 11.8 |
Pure Ni | 333 | 382 | 66.9 | 6.91 | 6.81 |
Pure Fe | 377 | 413 | 50.6 | - | 6.55 |
Table 1 Summarized electrochemical activities of porous Ni8Fe2 alloy, pure Ni and Fe.
Catalyst | Overpotential @10?mA?cm-2 (mV) | Overpotential @50?mA?cm-2 (mV) | Tafel slope (mV?dec-1) | Rct (Ω) | Cdl (mF?cm-2) |
---|---|---|---|---|---|
Porous Ni8Fe2 alloy | 269 | 298 | 42.5 | 1.01 | 11.8 |
Pure Ni | 333 | 382 | 66.9 | 6.91 | 6.81 |
Pure Fe | 377 | 413 | 50.6 | - | 6.55 |
Fig. 5. (a) Electrochemical water splitting performance of Ni8Fe2 || Ni8Fe2 system and Pt/C || RuO2 system, (b) a photograph of overall water splitting at 10?mA?cm-2, (c) long-term durability of Ni8Fe2 || Ni8Fe2 system in 1.0?M KOH for 25?h and (d) theoretical and experimental gas volume versus time for the water-splitting with porous Ni8Fe2 alloy.
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