| 覃晋晟,向乾坤,王林江,许艳旗.化学通报,2023,86(1):91-97. |
| “卡房”结构LDHs负载Pt纳米催化剂用于乙醇电催化氧化 |
| “Card-house”StructureLDHsSupportedPtNanocatalystforEthanolElectrocatalyticOxidation |
| 投稿时间：2022-05-31 修订日期：2022-07-03 |
| DOI： |
| 中文关键词: 层状双金属氢氧化物 贵金属纳米催化剂 电化学沉积 电催化 乙醇氧化 |
| 英文关键词:layered double hydroxides, noble metal nanocatalysts, electrochemical deposition, electrocatalysis, ethanol oxidation |
| 基金项目:广西自然科学基金项目(2018GXNSFAA294012,2019GXNSFBA245052)和桂林理工大学科研启动基金(GUTQDJJ2019133)资助 |
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| 中文摘要: |
| 乙醇电催化氧化是直接乙醇燃料电池（DEFCs）的核心反应，而DEFCs的阳极电催化剂是提升乙醇转化效率的关键。Pt作为最稳定、最有效的催化剂之一，仍面临着成本高、容易被乙醇氧化产生的中间产物毒化等问题。选择合适的载体实现Pt的高度、均匀、稳定分散，不仅可以提高其抗中毒能力和催化活性，而且还可以减少Pt用量降低成本。本文采用两步电化学沉积法合成了层状双金属氢氧化物（LDHs）纳米阵列负载Pt纳米催化剂（Pt/LDHs/NF），具有“卡房”结构的LDHs纳米增强了Pt纳米粒子的分散，有助于实现高效的乙醇电催化氧化性能。制备的Pt/NiFe-LDH/NF在碱性环境下对乙醇表现出最优的电催化氧化活性，峰值电流密度达到171.99 mA·cm-2。这为今后设计和制备高度、均匀、稳定分散的Pt基催化剂用于乙醇电催化氧化提供借鉴。 |
| 英文摘要: |
| Electrocatalytic oxidation of ethanol is one of the core reactions in direct ethanol fuel cell (DEFCs), and the anodic electrocatalyst of DEFCs is the key to improve the efficiency of ethanol conversion. Pt, as one of the most stable and effective catalysts among anodic electrocatalyst of DEFCs, still faces problems such as high cost and easy to be poisoned by the intermediates produced by ethanol oxidation. Selecting suitable carrier to realize the high, uniform and stable dispersion of Pt can not only improve its anti-poisoning ability and catalytic activity, but also reduce the amount of Pt and then reduce the cost. In this paper, layered double hydroxides (LDHs) nanoarrays supported Pt nanocatalysts (denoted as Pt/LDHs/NF) was synthesized by two-step electrochemical deposition method. The structural characterizations, including XRD, SEM, HRTEM, and XPS, showed that LDHs nanoarrays with "Card-house" structure enhanced the dispersion of Pt nanoparticles and helped to achieve efficient electrocatalytic oxidation of ethanol. According to the electrochemical measurements (e.g. cyclic voltammogram, electrochemical impedance spectroscopy, chronoamperometric, etc.), the prepared Pt/NiFe-LDH/NF showed the best electrocatalytic oxidation activity for ethanol in alkaline environment, and the peak current density reached 171.99 mA·cm-2. This provides a new strategy for the design and preparation of highly, uniform and stably dispersed Pt based catalysts for electrocatalytic oxidation of ethanol in the future. |
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