NiFe LDH的阳离子电化学插层对电催化OER的调节作用
首发时间:2020-05-28
摘要:本文以水热原位生长在碳布上的NiFe LDH为工作电极,通过简便易行、不破坏结构的阳离子插层方法提升NiFe LDH 电催化析氧性能。采用三电极体系对NiFe LDH分别进行Li+、Na+、K+阳离子电化学插层,对阳离子浓度、电解液类型、电化学插层方法等进行了探究,获得了最佳插层工艺。发现不同碱金属阳离子插层后通过调节层间距、电荷转移电阻、塔菲尔斜率等参数达到调节OER电催化性能的作用,其中钾离子插层后的样品电催化析氧性能最佳,仅需167 mV的过电位即可达到10mA cm-2电流密度,塔菲尔斜率为45mV dec-1。
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Cathodic electrochemical intercalation for NiFe LDH and its regulating effect for electrocatalytic OER performance
Abstract:In this paper, NiFe LDH grown on carbon cloth was fabricated by in-situ hydrothermal method and employed as the working electrode for OER catalyze. In order to improve its OER performance, three kinds of alkaline metal cations, Li+, Na+, K+were electrochemicallyintercalated into NiFeLDH respectively by three-electrode electrochemical workstation. The best intercalation process is optimized by comparing the intercalation effect of cation concentration, electrolyte type, and electrochemical method. The results showed that after intercalation of different alkali metal cations, the electrocatalytic performance of NiFe LDHcould be regulated by adjusting the parameters such as interlayer spacing, charge transfer resistance, and Tafel slope. Among these cations, the sample after potassium ion intercalation only needs 167 mV overpotential to achieve 10mA cm-2 current density, and the Tafel slope decreases to 45mV dec-1.
Keywords: NiFe LDH oxygen evolution reaction hydrothermal method cation intercalation
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NiFe LDH的阳离子电化学插层对电催化OER的调节作用
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