材料科学
面(心理学)
电催化剂
催化作用
氨
氨生产
化学工程
兴奋剂
氢
合金
铂金
电极
Atom(片上系统)
纳米技术
电化学
物理化学
复合材料
光电子学
化学
心理学
社会心理学
生物化学
有机化学
人格
计算机科学
工程类
五大性格特征
嵌入式系统
作者
Sisi Liu,Yuzhuo Jiang,Mengfan Wang,Yunfei Huan,Yanzheng He,Qiyang Cheng,Yu Cheng,Jie Liu,Xi Zhou,Tao Qian,Chenglin Yan
标识
DOI:10.1002/adfm.202306204
摘要
Abstract As the core of low‐temperature direct ammonia fuel cell (DAFC) technology, electrocatalytic ammonia oxidation reaction (AOR) has proven to be most active on platinum‐based catalysts. However, the AOR is extremely surface sensitive that only the Pt (200) facet exhibits high reaction activity, whereas other facets usually do not make contributions. Herein, the inert (220) surface of PtMo nano‐alloy is successfully awakened as one more active facet in addition to (200) via directional single‐atom Ni‐doping. The introduction of Ni triggers a targeted electron accumulation around Pt sites at the (220) facet that significantly reduces the AOR energy barrier while maintaining the activity of the (200) surface. With a greatly enlarged active surface, the Ni‐decorated PtMo catalyst exhibits a significantly facilitated AOR kinetics with a low onset potential of 0.49 V versus reversible hydrogen electrode and a superior peak current density of 94.96 A g −1 at 5 mV s −1 . Notably, the DAFC equipped with such an electrocatalyst reaches a remarkable peak power density of 16.70 mW cm −2 at low temperatures. It is believed that this strategy sheds light on exploiting the intrinsic activity of Pt‐based electrocatalysts, and drives the low‐temperature DAFC technology to a more practical level.
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