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Facile fabrication of hierarchically porous Ni foam@Ag-Ni catalyst for efficient hydrazine oxidation in alkaline medium
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2019-10-18 00:00:00 , DOI: 10.1016/j.jtice.2019.09.022
Yang Lei , Yi Liu , Baoan Fan , Lei Mao , Danqing Yu , Yanfen Huang , Fen Guo

With the procedure of H2 gas templated electrodeposition and subsequent galvanic replacement reaction, we successfully fabricate the Ni foam@Ag-Ni (Ni foam coated with Ag-Ni bimetals) electrode. Results show the electrodeposition time of 1.5 min produces Ni foam@Ni (Ni foam coated with Ni) with the largest mass specific surface area, and the galvanic replacement time of 8 min yields Ni foam@Ag-Ni with the most favorable catalytic activity toward hydrazine oxidation reaction (HzOR). Materials characterizations reveal the formation of Ag-Ni alloy, the presence of hierarchical pore-structure, the large superficial metallic Ni content and the low amount of Ag mass loading (0.0765 mg cm−2) in Ni foam@Ag-Ni. Electrochemical evaluations show the optimized Ni foam@Ag-Ni electrode delivers the significantly lowest onset potential toward HzOR, with a negative shift of ∼260 mV than Ni foam, ∼220 mV than Ni foam@Ni and ∼60 mV than Ni foam@Ag. Furthermore, it exerts the highest current density in 1.0 mol L–1 KOH and 25 mmol L–1 N2H4, more than 2 fold that of the Ni foam, Ni foam@Ni and Ni foam@Ag at –0.05 V versus Ag/AgCl. The superiority in micro-scale construction and surface composition also endows Ni foam@Ag-Ni electrode with the remarkable durability and considerable whole-cell performance.



中文翻译:

方便制备碱性多孔Ni泡沫@ Ag-Ni催化剂,可在碱性介质中有效地进行肼氧化

通过H 2气体模板电沉积和随后的电置换反应的程序,我们成功地制造了Ni泡沫@ Ag-Ni(涂有Ag-Ni双金属的Ni泡沫)电极。结果表明,电沉积时间为1.5 min会产生质量比表面积最大的Ni foam @ Ni(涂覆Ni的Ni泡沫),而电置换时间为8 min则产生的Ni泡沫@ Ag-Ni对镍的催化活性最强。肼氧化反应(HzOR)。材料表征表明,Ag-Ni合金的形成,分层孔隙结构的存在,较大的表层金属Ni含量和少量的Ag质量载荷(0.0765 mg cm -2))在镍泡沫@ Ag-Ni中。电化学评估显示,经过优化的镍泡沫@ Ag-Ni电极向HzOR的传递电势最低,比镍泡沫负迁移〜260 mV,镍泡沫@Ni迁移约220 mV,镍泡沫@Ag约60 mV。 。此外,在–0.05 V时,它在1.0 mol L –1 KOH和25 mmol L –1  N 2 H 4中具有最高的电流密度,是Ni泡沫,Ni泡沫@Ni和Ni泡沫@Ag的两倍。 Ag / AgCl。微观结构和表面组成的优越性也使Ni泡沫@ Ag-Ni电极具有卓越的耐用性和可观的全电池性能。

更新日期:2019-10-19
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