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Unveiling the effect of the crystalline phases of iron oxyhydroxide for highly sensitive and selective detection of dopamine
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-08-13 , DOI: 10.1039/d1dt01672e
Sreejesh Moolayadukkam 1 , Savithri Vishwanathan 1 , Byeongsun Jun 2 , Sang Uck Lee 2, 3 , H S S Ramakrishna Matte 1
Affiliation  

Electrocatalysis is key to the development of several important energy and biosensing applications. In this regard, the crystalline phase-dependent electrocatalytic activity of materials has been extensively studied for reactions such as hydrogen evolution, oxygen reduction, etc. But such comprehensive studies for evaluating the phase-dependence of electrochemical biosensing have not been undertaken. Herein, three crystalline phases (α-, β-, and γ-) of iron oxyhydroxide (FeOOH) have been synthesized and characterized by spectroscopic and microscopy techniques. Electrochemical studies revealed their high sensitivity and selectivity towards dopamine (DA) detection. Amongst the three electrocatalysts, β-FeOOH shows the highest sensitivity (337.15 μA mM−1 cm−2) and the lowest detection limit (0.56 μM). The enhanced electrocatalytic activity of β-FeOOH, as compared to that of α- and γ-FeOOH, was attributed to its higher active site percentage and facile electrode kinetics. Furthermore, theoretical studies probed into the DA-FeOOH interactions by evaluating the charge transfer characteristics and hydrogen adsorption energies of the three phases to support the experimental findings.

中文翻译:

揭示羟基氧化铁的结晶相对多巴胺的高灵敏度和选择性检测的影响

电催化是开发几种重要的能源和生物传感应用的关键。在这方面,材料的晶相依赖性电催化活性已被广泛研究用于析氢、氧还原反应。但是尚未进行此类用于评估电化学生物传感的相位依赖性的综合研究。在此,合成了羟基氧化铁 (FeOOH) 的三个晶相(α-、β-和 γ-),并通过光谱和显微镜技术对其进行了表征。电化学研究揭示了它们对多巴胺 (DA) 检测的高灵敏度和选择性。在三种电催化剂中,β-FeOOH 表现出最高的灵敏度(337.15 μA mM -1 cm -2) 和最低检测限 (0.56 μM)。与 α- 和 γ-FeOOH 相比,β-FeOOH 增强的电催化活性归因于其较高的活性位点百分比和简便的电极动力学。此外,理论研究通过评估三相的电荷转移特性和氢吸附能来探讨 DA-FeOOH 相互作用,以支持实验结果。
更新日期:2021-09-08
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