Synthesis of TiO2-NTs coated with MWCNT/In2O3-NRs: Investigation of efficiency in electrocatalytic hydrogen production

IF 4.4 3区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Communications Pub Date : 2025-04-06 DOI:10.1016/j.inoche.2025.114476

Evrim Baran Aydin , Gökmen Siğircik

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Abstract

This study focuses on enhancing the electrocatalytic activity of TiO₂ Nanotubes (TiO₂-NTs) for the hydrogen evolution reaction (HER) by coating them with indium oxide Nanorods (In₂O₃-NRs), Multi-Walled Carbon Nanotubes (MWCNTs), and their mixtures using spin coating. The XRD analysis confirmed that In₂O₃ and TiO₂ have cubic and tetragonal anatase structures, respectively. FE-SEM images revealed rod-like In₂O₃ and spherical MWCNT on TiO₂-NTs, and the Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic (PD) polarization techniques. The Mott-Schottky analysis determined donor density (N_D) values for the samples, ranging from 2.51 × 10¹⁹ to 3.06 × 10¹⁹ cm⁻³. Total polarization resistance obtained from EIS at E_ocp was determined as 555.4 Ω cm² for 2.1-MWCNT.In₂O₃/TiO₂-NTs material. Moreover, 1.2-MWCNT.In₂O₃/TiO₂-NTs shows overpotential of 671 mV at current density of 10 mA cm⁻² for HER with a Tafel slope of 71.4 mV dec⁻¹ and 4.52 μA cm⁻² current density in 1 M KOH solution. The materials were analyzed for structural and electrochemical properties, showing improved conductivity, lower resistance, and better HER performance with the optimized MWCNT/In₂O₃ ratios.

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MWCNT/In2O3-NRs包覆TiO2-NTs的合成：电催化制氢效率的研究

本研究主要通过自旋涂覆氧化铟纳米棒（In2O3-NRs）、多壁碳纳米管（MWCNTs）及其混合物来增强TiO2纳米管（TiO2- nts）在析氢反应（HER）中的电催化活性。XRD分析证实In2O3和TiO2分别具有立方和四方锐钛矿结构。FE-SEM图像显示TiO2-NTs上的棒状In2O3和球形MWCNT，以及电化学阻抗谱（EIS）和电位动力学（PD）极化技术。Mott-Schottky分析确定了样品的供体密度（ND）值，范围从2.51 × 1019到3.06 × 1019 cm−3。对于2.1 mwcnt， EIS在Eocp得到的总极化电阻为555.4 Ω cm2。研究/ TiO2-NTs材料。此外,1.2 -mwcnt。在1 M KOH溶液中，当电流密度为10 mA cm−2时，TiO2-NTs的过电位为671 mV， Tafel斜率为71.4 mV dec−1，电流密度为4.52 μA cm−2。通过对材料结构和电化学性能的分析，发现优化后的MWCNT/In2O3比例提高了材料的导电性，降低了材料的电阻，提高了材料的HER性能。

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来源期刊

Inorganic Chemistry Communications 化学-无机化学与核化学

CiteScore

5.50

自引率

7.90%

发文量

1013

审稿时长

53 days

期刊介绍： Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.