Insights into direct plasmon-activated eletrocatalysis on gold nanostar via efficient photothermal effect and reduced activation energy
Insights into direct plasmon-activated eletrocatalysis on gold nanostar via efficient photothermal effect and reduced activation energy
复制标题
通过高效的光热效应和降低的活化能深入了解金纳米星上的直接等离子体激活电催化
DOI：
10.1016/j.electacta.2019.01.172
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发表时间：
2019-04-01
影响因子：
6.6
通讯作者：
Wang, Chen
中科院分区：
文献类型：
--
作者：
Wang, Shan-Shan;Hu, Wen-Chao;Wang, Chen
等离子体领域为光催化、纳米光子学、光伏和光热治疗等各个领域带来了新的机遇。特别是，热载流子（热空穴和电子）的产生以及通过局域表面等离子体共振（LSPR）激发的光热效应可用于激活化学反应。了解潜在的机制需要对等离子体纳米结构的催化增强进行定量测量。在这项工作中，使用抗坏血酸（AA）作为反应模型研究了等离子体金纳米星（AuNSs）激活的电催化作用。我们发现 AuNSs 在局域表面等离子体共振激发下表现出显着增强的电化学性能。通过测量反应活化能、开路电位（OCP）以及与波长和光强度相关的电流响应，提出有效的热载流子分离、降低的活化能和适当的光热效应有助于促进电催化。基于该研究，构建了一种灵敏检测AA的直接等离子体改进电化学传感器，可以成功检测低至10.0μM的AA浓度。目前的工作将为等离子体介导的电化学过程提供新的机制见解。 (C) 2019 年由爱思唯尔有限公司出版。
The field of plasmonics brings new opportunities in various fields such as photocatalysis, nanophotonics, photovoltaics and photothermal therapeutics. In particular, the generation of hot carriers (hot holes and electrons) as well as the phtothermal effect via excitation of localized surface plasmon resonance (LSPR) can be used to activate chemical reactions. Understanding the underlying mechanism requires quantitative measurements of catalytic enhancement on the plasmonic nanostructures. In this work, the plasmonic gold nanostar (AuNSs) activated electrocatalysis was investigated using ascorbic acid (AA) as a reaction model. We found that AuNSs shows significantly enhanced electrochemical performance upon LSPR excitation. By measurement of the reaction activation energy, open circuit potential (OCP), and the wavelength and light intensity-dependent current responses, it is proposed that the efficient hot carriers separation, reduced activation energy and considerate photothermal effect contribute to the promoted electrocatalysis. Based on the study, a direct plasmon-improved electrochemical sensor towards sensitive detection of AA is constructed, and AA concentration as low as 10.0 mu M can be successfully detected. The present work would shed new mechanistic insights into the plasmon-mediated electrochemical processes. (C) 2019 Published by Elsevier Ltd.