过电位
反键分子轨道
析氧
纳米棒
聚苯胺
材料科学
费米能级
催化作用
电化学
电催化剂
纳米技术
化学工程
化学
物理化学
复合材料
电极
物理
生物化学
聚合物
量子力学
原子轨道
工程类
聚合
电子
作者
Qiu Ai-zhong,Dawei Qiu,Dezhen Shen,Yu Ying
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-12-30
标识
DOI:10.1021/acsanm.3c04656
摘要
To explore a methodology for tailoring the d-band center of metal oxide catalysts, a distinctive composite is synthesized by incorporating polyaniline (PANI) particles with specific atoms of Co3O4 nanorods. The introduction of the requisite amount of PANI significantly enhances the electrocatalytic activity, yielding an excellent functionality with a minimum detection limit of 0.676 μM and a high sensitivity of 3.024 μA μM–1 cm–2 for glucose. The opening potential for the oxygen evolution reaction registers at 1.41 V, while the overpotential is 290 mV. However, when the PANI layer completely covers the Co3O4 surface, a substantial decline in electrochemical properties is observed, indicating that active atoms on the Co3O4 plane should be preferentially exposed. Additionally, density functional theory calculations reveal that bonding of an appropriate quantity of polyaniline particles can modify bonding states and antibonding states of Co–O within the Co3O4 complex, leading to a shift of the d-band center closer to the Fermi level, thereby enhancing its electrocatalytic activity. These findings underscore the practicality of this manipulation strategy for glucose sensing and oxygen evolution reaction.
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