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Material Sciences 2020
CS@NiFe LDHs催化剂的制备及其在电催化析氧中的应用
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Abstract:
本文通过简单的水热和煅烧的方法成功将镍铁层状双金属氢氧化物(NiFe LDHs)纳米片原位生长在了非晶碳球(CS)上，制备出具有三维核壳异质结构的高效析氧电催化剂——CS@NiFe LDHs。我们采用X射线衍射、X射线光电子能谱和透射电子显微镜对样品的组成和结构进行了表征，采用线性扫描伏安法、循环伏安法、电化学交流阻抗测试和计时电流法对样品的电催析氧化性能进行了测试。得益于碳球良好的导电性、NiFe LDHs纳米片优异的催化活性和独特的三维核壳异质结构，CS@NiFe LDHs催化剂表现出优异的析氧性能：达到10 mA？cm？2电流密度时，所需的过电势仅为246 mV，塔菲尔斜率为60.14 mV？dec？1，并且经过24 h的测试，该催化剂依然表现出优秀的电化学稳定性。希望这项工作能够为设计和合成具有三维纳米结构的过渡金属氢氧化物提供新的思路与借鉴。
The efficient oxygen evolution reaction (OER) catalyst of CS@NiFe LDHs with three-dimensional core-shell heterostructure was obtained by growing NiFe layered double hydroxide (NiFe LDHs) on the surface of amorphous carbon sphere received through simple hydrothermal and calcination methods. X-ray diffraction, X-ray Photoelectron Spectroscopy and transmission electron microscopy were applied to characterize the composition and structural features of catalyst. The electrocatalytic property for OER was evaluated by linear sweep voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. Benefited from the conductivity of carbon sphere, the electrocatalytic activities of NiFe LDHs, and the unique structural merits of three-dimensional (3D) core-shell heterostructure, CS@NiFe LDHs catalyst manifests outstanding OER activity with a lower overpotential of 246 mV driving a current density at 10 mA？cm？2, a smaller Tafel slope of 60.14 mV per decade and superior electrochemical stability of 24 h in the alkaline media. This work may provide a novel opportunity for the rational design and synthesis of transition metal hydroxide with hetero-phase 3D nanostructures for other promising applications.
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