石墨烯/二氧化钛/磷化铁复合低铂催化剂用于高效甲醇氧化
Graphene/Titanium dioxide/Iron Phosphide Composite with Low Platinum Catalysts for Efficient Methanol Oxidation
Received date: 2024-01-14
Online published: 2024-04-14
铁钛双金属由于其强烈的协同效应以及双功能机理, 在电化学领域中展现出了优秀的催化活性. 针对目前甲醇燃料电池铂基催化剂成本高、抗CO中毒能力低以及循环稳定性差等制约其商业化应用的关键瓶颈问题, 采用了一种简单的水热、低温磷化以及油浴方法, 成功合成了在石墨烯上负载的低铂/二氧化钛修饰磷化铁复合材料(Pt@rGO/TiO2-FeP)用于甲醇电池阳极催化剂. 循环伏安法(CV)、计时电流法(CA)和多电位阶跃方法(STEP)等研究表明, 使用低温磷化法可以有效提升催化剂的甲醇氧化性能, 在Pt负载量仅为4.3% (w)时, 催化剂的峰电流密度达到2319.5 mA•mg−1, 是商用Pt/C催化剂(390.5 mA•mg−1)的5.9倍. 通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散X射线光谱(EDX)、X射线电子衍射(XRD)和X射线光电子能谱(XPS)等表征方法对催化剂进行一系列分析, 发现二氧化钛、磷化铁以及铂纳米颗粒在石墨烯上均匀分布, 因为过渡双金属的负载, 促进Pt的d带中心降低, 有效提升了催化剂的甲醇氧化性能. 本工作合成的Pt@rGO/TiO2-FeP纳米复合材料, 具有优异的甲醇氧化性能和抗CO中毒能力, 为高性能甲醇燃料电池的研发提供了一个全新的思路和实践.
汪子航 , 钱静雯 , 许佳慧 , 邱浩渝 , 晏梦珑 , 刘芸 , 罗杰 , 盛毓泰 , 陈易 , 王贤保 . 石墨烯/二氧化钛/磷化铁复合低铂催化剂用于高效甲醇氧化[J]. 化学学报, 2025 , 83(3) : 221 -228 . DOI: 10.6023/A24010013
Due to the strong synergistic effect and bifunctional mechanism, Fe-Ti bimetallic catalysts have shown excellent catalytic activity in electro-chemistry. In order to solve the catalyst problems of high cost, low anti-toxicity, and poor cycling stability, a simple hydrothermal and low-temperature phosphating method was explored to prepare the graphene/titanium dioxide/iron phosphide composite with low platinum contents (Pt@rGO/TiO2-FeP) for methanol battery anode. Through the cyclic voltammetry (CV), chronoamperometry (CA), and the multipotential step method (STEP), the methanol oxidation performance was effectively enhanced by the low-temperature phosphatization. When the Pt loading at 4.3% (w), the catalyst peak current density reached 2319.5 mA•mg−1, which was 5.9 times higher than that of the commercial Pt/C catalyst (390.5 mA•mg−1). With a series of characterization methods such as scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray electron diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), it was found that the titanium dioxide, iron phosphide and Pt nanoparticles were uniformly distributed on the surface of reduced graphene oxide (rGO). The methanol oxidation performance of this catalyst was improved because of the Fe-Ti bimetallic loading. The Pt@rGO/TiO2-FeP nanocomposites have excellent methanol oxidation performance and CO poisoning resistance, which provide a new idea and practice for the research and development of high-performance methanol fuel cells.
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