In-situ electrodeposited flower-like NiFeOxHy/rGO on nickel foam for oxygen evolution reaction
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摘要: 开发碱性体系的高效低成本析氧电催化剂是由可再生能源转化制氢的关键。本研究通过在泡沫Ni基底上原位电化学沉积的方法制备了花瓣状NiFeOxHy和NiFeOxHy/rGO复合催化剂用于析氧反应。花瓣状的结构不仅明显提高了催化剂的比表面积，而且暴露了更多的层状边缘和缺陷，进而增加了催化剂的活性中心。还原氧化石墨烯的加入进一步提升了催化剂的电导和析氧电催化性能，通过优化NiFeOxHy/rGO在1 mol/L KOH溶液中的析氧性能为：过电位200 mV（10 mA/cm2）、Tafel斜率29.11 mV/decade，并且保持了较好的稳定性。
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关键词:
- 析氧反应 /
- NiFeOxHy/rGO /
- 电催化 /
- 花瓣状
Abstract: Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) in basic media is critical to hydrogen production from renewable energy. Herein, in-situ electrodeposited flower-like NiFeOxHy and NiFeOxHy/rGO composite electrocatalysts on Ni foam for OER are reported. The active sites of the flower-like electrocatalysts are increased significantly due to the enhanced NiFeOxHy surface areas and numerous exposed layered edges and edge defects. Reduced graphene oxide (rGO) has been introduced to fabricate NiFeOxHy/rGO composite film, further improving the conductivity and OER performance of the flower-like NiFeOxHy. The optimized NiFeOxHy/rGO exhibits superior OER performance with a Tafel slope of 29.11 mV/decade, an overpotential of 200 mV at 10 mA/cm2 in 1 mol/L KOH and favorable long-term stability.-
Key words:
- oxygen evolution reactions /
- NiFeOxHy/rGO /
- electrocatalysis /
- flower-like
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Figure 2 (a) SEM image of nickel foam and ((b)-(d)) SEM images of NiFeOxHy /NF at different magnification
Figure 3 ((a)-(c)) SEM images of NiFeOxHy/rGO/NF at different magnification, (d) EDS of NiFeOxHy/rGO/NF, ((e)-(g)) elemental mapping of NiFeOxHy /NF
Figure 4 High-resolution XPS spectra of the NiFeOxHy
(a): wide-scan; (b) Ni 2p; (c): Fe 2p; (d): O 1s
Figure 6 (a) OER performance and of a: NiFeOxH, b: Ni2FeOxHy, c: NiFeOxHy/rGO, d: NiFe2OxHy, e: pure NF and f: commercial IrO2; (b) their Tafel slope; (c) long term stability of NiFeOxHy/rGO and NiFeOxHy; (d) EIS of NiFeOxHy/rGO and NiFeOxHy electrodes
Table 1 ICP results of NiFeOxHy and NiFeOxHy/rGO composite electrocatalysts
Entry Elements w/% Composition NiFeOxHy Ni
Fe53.2%
46.8%Ni52Fe48 NiFeOxHy/rGO Ni
Fe53.3%
46.7%Ni52Fe48 Ni1Fe2OxHy/rGO Ni
Fe34.4%
65.6%Ni34Fe66 Ni2Fe1OxHy/rGO Ni
Fe70.1%
29.9%Ni69 Fe31 
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