化学
催化作用
密度泛函理论
石墨烯
电化学
纳米材料
兴奋剂
选择性
电极
Atom(片上系统)
无机化学
纳米技术
物理化学
计算化学
材料科学
有机化学
光电子学
计算机科学
嵌入式系统
作者
Baojun Long,Yuanmeng Zhao,Peiyu Cao,Wei Wen,Yan Mo,Juejing Liu,Chengjun Sun,Xiaofeng Guo,Changsheng Shan,Ming‐Hua Zeng
标识
DOI:10.1021/acs.analchem.1c04912
摘要
Conventional nanomaterials in electrochemical nonenzymatic sensing face huge challenge due to their complex size-, surface-, and composition-dependent catalytic properties and low active site density. In this work, we designed a single-atom Pt supported on Ni(OH)2 nanoplates/nitrogen-doped graphene (Pt1/Ni(OH)2/NG) as the first example for constructing a single-atom catalyst based electrochemical nonenzymatic glucose sensor. The resulting Pt1/Ni(OH)2/NG exhibited a low anode peak potential of 0.48 V and high sensitivity of 220.75 μA mM-1 cm-2 toward glucose, which are 45 mV lower and 12 times higher than those of Ni(OH)2, respectively. The catalyst also showed excellent selectivity for several important interferences, short response time of 4.6 s, and high stability over 4 weeks. Experimental and density functional theory (DFT) calculated results reveal that the improved performance of Pt1/Ni(OH)2/NG could be attributed to stronger binding strength of glucose on single-atom Pt active centers and their surrounding Ni atoms, combined with fast electron transfer ability by the adding of the highly conductive NG. This research sheds light on the applications of SACs in the field of electrochemical nonenzymatic sensing.
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