Electronic modulation and synergistic effect on Fe-doped NiSe@NiS composites to improve oxygen evolution performance
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摘要: 本研究采用溶剂热法,在泡沫镍(NF)基底上原位合成出Fe掺杂的硒化镍和硫化镍复合材料(Fe-NiSe@NiS/NF)。得益于Fe掺杂优化的电子结构、NiSe和NiS间的协同效应以及高效的电荷转移速率,Fe-NiSe@NiS/NF在1 mol/L KOH溶液中表现出优异的OER性能。在过电位为330 mV时可实现电流密度150 mA/cm2,且电压在稳定40 h后没有发生显著改变。
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关键词:
- NiSe@NiS复合材料 /
- Fe掺杂 /
- 协同效应 /
- 电子调制 /
- 析氧反应.
Abstract: In this paper, Fe-doped nickel selenide and nickel sulfide composites was in-situ grown on nickel foam (NF) to prepare Fe-NiSe@NiS/NF by solvothermal method. Benefit from the optimized electron structure by Fe doping, the synergistic effect of NiSe@NiS and faster electron transfer, Fe-NiSe@NiS/NF exhibited excellent OER activity with the overpotential of 330 mV at 150 mA/cm2 in 1 mol/L KOH solution. The voltage barely changed after 40 h of test.-
Key words:
- NiSe@NiS composites /
- Fe doping /
- synergistic effect /
- electronic modulation /
- oxygen evolution reaction
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图 5 在特定电压范围(0.90224 –1.0224 V vs. RHE)内不同扫描速率下的CV曲线:(a)NiS/NF;(b)Fe-NiSe/NF;(c)NiSe@NiS/NF;(d)Fe-NiSe@NiS/NF;(e)双电层电容;(f)基于ECSA的极化曲线
Figure 5 CV curves at the potential of 0.9224 –1.0224 V vs RHE with different scan rates of (a) NiS/NF, (b) Fe-NiSe/NF, (c) NiSe@NiS/NF, (d) Fe-NiSe@NiS/NF, (e) Measured capacitive currents, (f) Normalized LSV curves based on ECSA for NiS/NF, Fe-NiSe/NF,NiSe@NiS/NF and Fe-NiSe@NiS/NF
图 6 不同铁含量的Fe-NiSe@NiS/NF的(a)极化曲线;(b)奈奎斯特曲线;((c)–(e))在特定电压范围(0.9224 –1.0224 V vs. RHE)内不同扫描速率下的CV曲线;(f)双电层电容
Figure 6 (a) LSV curves, (b) Nyquist plots, ((c)–(e)) CV curves at the potential of 0.9024 –1.0024 V vs. RHE with different scan rates (20–100 mV/s) on Fe-NiSe@NiS/NF with different Fe content, (f) Measured capacitive currents
表 1 ICP测试
Table 1 Results of ICP
Catalyst ICP-MS w/% Ni Fe Fe-NiSe@NiS/NF-1 47.28 1.93 Fe-NiSe@NiS/NF-3 41.35 4.61 Fe-NiSe@NiS/NF-5 39.47 8.03 -
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