Hydrothermal Synthesis of a rGO Nanosheet Enwrapped NiFe Nanoalloy for Superior Electrocatalytic Oxygen Evolution Reactions
Hydrothermal Synthesis of a rGO Nanosheet Enwrapped NiFe Nanoalloy for Superior Electrocatalytic Oxygen Evolution Reactions
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水热合成 rGO 纳米片包裹的 NiFe 纳米合金，实现卓越的电催化析氧反应
DOI：
10.1002/chem.201602782
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Geng Baoyou
中科院分区：
文献类型：
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作者：
Geng Jing;Kuai Long;Kan Erjie;Sang Yan;Geng Baoyou
基于石墨烯的混合纳米结构在电化学能源应用领域具有许多优势。在这项工作中，一个简单而有效的水热方法已被开发用于制备NiFe合金纳米粒子/rGO杂化纳米结构，其中纳米粒子与rGO纳米片很好地结合，纳米粒子的尺寸约为100 nm。 此外，电化学析氧反应（OER）测试证实，所获得的NiFe/rGO杂化纳米结构比无rGO的NiFe纳米颗粒和纯Ni/rGO杂化物具有显著更高的活性，并且最佳NiFe比为2：1。在20 mA cm−1− 2下，Ni 2Fe/rGO的OER过电位低至0.285 V，比纯Ni/rGO混合物低96 mV。 同时，Ni 2Fe/rGO催化剂具有良好的稳定性。因此，本工作为制备NiFe合金纳米颗粒/rGO杂化结构提供了一种简便有效的方法，该杂化结构在电化学水裂解电池、可充电金属/空气电池等电化学能源器件领域具有潜在的应用前景。
Graphene‐based hybrid nanostructures possess many advantages in the field of electrochemical energy applications. In this work, a facile and efficient hydrothermal approach has been developed for the preparation of NiFe alloy nanoparticles/rGO hybrid nanostructures, in which the nanoparticles are well combined with rGO nanosheets and the size of the nanoparticles is about 100 nm. Moreover, the electrochemical oxygen evolution reaction (OER) tests confirmed that the obtained NiFe/rGO hybrid nanostructures possess notably higher activity than both the rGO‐free NiFe nanoparticles and pure Ni/rGO hybrids, and the optimal NiFe ratio is 2:1. The OER overpotential at 20 mA cm−1−2with Ni2Fe/rGO is as low as 0.285 V, which is 96 mV lower than that of pure Ni/rGO hybrids. Meanwhile, the Ni2Fe/rGO catalyst has excellent stability. Therefore, this work contributes a facile and efficient method to prepare a NiFe alloy nanoparticles/rGO hybrid structure for potential applications in the field of electrochemical energy devices, such as electrochemical water splitting cells, rechargeable metal/air batteries, etc.