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In Situ Growth of Amorphous NiFe Hydroxides on Spinel NiFe2O4 via Ultrasonic-Assisted Reduction for an Enhanced Oxygen Evolution Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-10 , DOI: 10.1021/acssuschemeng.0c05888
Lu Yao 1 , Zhibin Geng 1 , Wei Zhang 2 , Xiaofeng Wu 1 , Jinghai Liu 3 , Liping Li 1 , Xiyang Wang 1 , Xiangyan Hou 1 , Ke Xu 4 , Keke Huang 1 , Shouhua Feng 1
Affiliation  

Amorphous Ni–Fe hydroxides (NiFe(OH)x) are considered to possess promising potential as oxygen evolution reaction (OER) electrocatalysts, but amorphous NiFe(OH)x is hard to synthesize due to the complicated multistep synthesis process. Herein, amorphous NiFe(OH)x is successfully grown in situ on the surface of NiFe2O4 via an ultrasonic-assisted reduction method. This method takes advantage of ultrasonic cavitation to achieve a unique reduction effect, migration of Ni and Fe cations of NiFe2O4 to the crystal surface, and in situ growth of amorphous NiFe(OH)x, thereby forming a NiFe2O4/NiFe(OH)x composite. This material exhibits enhanced electrochemical performance with an overpotential of 276 mV at 10 mA cm–2. The ultrasonic-assisted reduction method can be used to synthesize amorphous NiFe(OH)x with no residual reactants, providing a simple and facile way to synthesize amorphous hydroxide materials.

中文翻译:

超声辅助还原在尖晶石NiFe 2 O 4上原位生长非晶态NiFe氢氧化物以增强析氧反应

非晶态的Ni-Fe氢氧化物(NiFe(OH)x)被认为是有潜力的氧释放反应(OER)电催化剂,但是非晶态的NiFe(OH)x由于复杂的多步合成工艺而难以合成。在此,通过超声辅助还原法成功地在NiFe 2 O 4的表面上原位生长了非晶态的NiFe(OH)x。该方法利用超声空化来实现独特的还原效果,NiFe 2 O 4的Ni和Fe阳离子迁移到晶体表面以及非晶NiFe(OH)x的原位生长,从而形成NiFe 2 O 4。/ NiFe(OH)x复合材料。这种材料具有增强的电化学性能,在10 mA cm –2时的过电势为276 mV 。超声辅助还原法可用于合成无残留反应物的非晶态NiFe(OH)x,为合成非晶态氢氧化物提供了一种简便的方法。
更新日期:2020-11-23
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