Synthesis of size-selected Pt/GONR nanocomposites for visible-light-enhanced methanol oxidation reaction in an alkaline solution

IF 3.3 Q3 ENERGY & FUELS

MRS Energy & Sustainability Pub Date : 2022-09-01 DOI:10.1557/s43581-022-00054-8

Chia-Liang Sun, Yu-Chih Chen, Cheng-Hsuan Lin, Hung-Yu Chen

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Abstract

Abstract In this study, we prepared size-selected Pt/graphene oxide nanoribbon (GONR) composites as fuel-cell anode photoelectrocatalysts for methanol oxidation reaction (MOR) in an alkaline solution. Additionally, we used a light-emitting diode (LED) and a Xeon (Xe) lamp to increase the current densities of methanol oxidation reaction while photoelectrochemical phenomenon occurred upon our catalysts. The major parameter of our research is microwave powers for unzipping GONRs for electrochemical and photoeletrochemical measurements. Firstly, we utilized microwave heating to fabricate GONRs and load Pt nanoparticles made by chemical reduction methods. Secondly, we carried out the electrochemical and photoeletrochemical measurements using electrocatalyst-modified screen-printed carbon electrodes. The size distribution of Pt colloidal nanoparticles was characterized by transmission electron microscopy. The compositions of composite catalysts were determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The MOR photocurrent density of Pt/GONR (200 W) in cyclic voltammograms is 458 mA/mg_Pt under LED illumination. The photocurrent increase of this condition is 38.0% which is better than its dark one. Furthermore, we can obtain the MOR photocurrent density of 608, 696, and 794 mA/mg_Pt using Xe lamp with a power of 500, 750, and 1000 mW/cm^2. Graphical abstract Highlights The Pt/graphene oxide nanoribbon composites was used as electrocatalysts for the methanol oxidation reaction in an alkaline solution. The visible light sources help to improve the peak oxidation currents of the reaction using our electrocatalysts. Discussion The requirements for a best carbon support for a specific photoelectrochemical reaction remain an issue. The quantitative analyses of the current increase induced by photon energy in a specific electrochemical reaction are not well resolved yet.

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用于碱性溶液中可见光增强甲醇氧化反应的尺寸选择的Pt/GONR纳米复合材料的合成

摘要在本研究中，我们制备了尺寸选择的Pt/氧化石墨烯纳米带（GONR）复合材料，作为碱性溶液中甲醇氧化反应（MOR）的燃料电池阳极光电催化剂。此外，我们使用发光二极管（LED）和至强（Xe）灯来增加甲醇氧化反应的电流密度，同时在我们的催化剂上发生光电化学现象。我们研究的主要参数是用于电化学和光电化学测量的GONR解压缩的微波功率。首先，我们利用微波加热制备了GONR，并负载了化学还原法制备的Pt纳米颗粒。其次，我们使用电催化剂修饰的丝网印刷碳电极进行了电化学和光电化学测量。用透射电子显微镜对Pt胶体纳米粒子的粒径分布进行了表征。用扫描电子显微镜和能谱仪测定了复合催化剂的组成。在LED照明下，Pt/GONR（200W）在循环伏安图中的MOR光电流密度为458mA/mg_Pt。该条件下的光电流增幅为38.0%，优于暗条件下的增幅。此外，我们可以使用功率为500、750和1000mW/cm^2的Xe灯获得608、696和794mA/mg_Pt的MOR光电流密度。图形摘要亮点Pt/氧化石墨烯纳米带复合材料被用作碱性溶液中甲醇氧化反应的电催化剂。使用我们的电催化剂，可见光源有助于提高反应的峰值氧化电流。讨论对特定光电化学反应的最佳碳载体的要求仍然是一个问题。对特定电化学反应中光子能量引起的电流增加的定量分析尚未得到很好的解决。

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来源期刊

MRS Energy & Sustainability ENERGY & FUELS-

CiteScore

6.40

自引率

2.30%

发文量