Novel graphitic carbon nitride/graphite carbon/palladium nanocomposite as a high-performance electrocatalyst for the ethanol oxidation reaction
Novel graphitic carbon nitride/graphite carbon/palladium nanocomposite as a high-performance electrocatalyst for the ethanol oxidation reaction
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DOI：
10.1016/j.electacta.2016.01.124
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发表时间：
2016-02
影响因子：
6.6
通讯作者：
Zesheng Li;Runsheng Lin;Zhisen Liu;Dehao Li;Hongqiang Wang;Qingyu Li
中科院分区：
文献类型：
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作者：
Zesheng Li;Runsheng Lin;Zhisen Liu;Dehao Li;Hongqiang Wang;Qingyu Li
石墨碳氮化物（g-C3 N4）具有高的氮含量和优异的化学稳定性和热稳定性，还显示出固有的电化学性能。由于极低的电子电导率，纯g-C3 N4通常仅限于电催化应用。本研究以乙醇为催化剂，制备了石墨/碳（GC）负载的g-C3 N4/Pd电催化剂，该催化剂具有良好的导电性能。在Pd@ g-C3 N4/GC电催化剂中，由于g-C3 N4的超薄结构沉积在GC表面，成功地形成了GC、g-C3 N4和Pd组分的三相界面。采用循环伏安法和交流阻抗法研究了Pd@ g-C3 N4/GC、Pd@ g-C3 N4、Pd@GC和Pd@amorphous carbon（AC）对乙醇电氧化的电催化性能。Pd@ g-C3 N4/GC对乙醇的氧化表现出最好的电催化性能，其氧化峰电流密度为2156 A/g Pd，起始电位为0.32 V。Pd@ g-C3 N4/GC的峰电流密度在200次连续循环伏安后仍保持在1904 A/g Pd。Pd@ g-C3 N4/GC复合材料可能是直接乙醇燃料电池中乙醇氧化反应的候选电催化剂之一。
Graphitic carbon nitride (g-C3N4) possesses high nitrogen content with excellent chemical and thermal stability, which also shows inherent electrochemical properties. Due to the extremely low electronic conductivity, pure g-C3N4is usually restricted to electrocatalytic applications. In this study, we report the synthesis of graphite carbon (GC) supported g-C3N4and palladium (Pd) electrocatalyst with excellent electronic conductivity for the ethanol oxidation reaction. In virtue of the ultra-thin structure of g-C3N4deposited on the surface of GC, the crucial three-phase boundary from GC, g-C3N4and Pd component are successfully formed in Pd@g-C3N4/GC electrocatalyst. The electrocatalytic performances on ethanol electrooxidation of Pd@g-C3N4/GC, Pd@g-C3N4, Pd@GC and Pd@amorphous carbon (AC) have been systematically investigated by the techniques of cyclic voltammetry and electrochemical impedance spectroscopy. The Pd@g-C3N4/GC displays the best electrocatalytic performances with a high oxidation peak current density of 2156 A/g Pd and low on-set potential of 0.32 V for the ethanol oxidation. The peak current density of Pd@g-C3N4/GC maintains at 1904 A/g Pd after 200 continuous cyclic voltammetry cycles. The Pd@g-C3N4/GC composite material might be one of candidate electrocatalysts for the ethanol oxidation reaction in direct ethanol fuel cells.