Scholarlink

<p>It is considerably significant and challenging to prepare platinum (Pt)-based catalysts with high activity and stability for the development of direct methanol fuel cells (DMFCs). On that account, we used Pt nanoparticles (NPs) as the core, coated zeolitic imidazolate framework-8 (ZIF-8), silicon dioxide (SiO<sub>2</sub>) and Pt NPs on their surfaces. Afterward, the SiO<sub>2</sub> was etched away to prepare Pt-based nanomaterials with core-shell structure, which were named Pt@ZIF-8/Pt. Simultaneously, the electrocatalytic properties of Pt@ZIF-8/Pt nanomaterials catalyzing methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) were tested under alkaline conditions. The mass and specific activities of Pt@ZIF-8/Pt-12 for MOR were 3285.07&#xa0;mA mg<sub>Pt</sub><sup>−1</sup> and 1.12&#xa0;mA&#xa0;cm<sup>−2</sup> correspondingly. The limiting current densities (LCD), initial potentials (E<sub>onset</sub>) and half-wave potentials (E<sub>1/2</sub>) for the catalytic ORR of sample Pt@ZIF-8/Pt-12 were 6.24&#xa0;mA&#xa0;cm<sup>−2</sup>, 1.04&#xa0;V and 0.83&#xa0;V, respectively. Last but not least, zinc-air battery was assembled utilizing the Pt@ZIF-8/Pt-12 catalyst. The open circuit potential and maximum power density of the zinc-air battery were 1.48&#xa0;V and 120.8 mW cm<sup>−2</sup>. As evidently demonstrated by our research findings, it still maintained excellent stability after 600&#xa0;h of cyclic charge and discharge tests. As a result, this research not only provides enlightening guidance for catalyst design for DFMCs and zinc-air batteries, but also accelerates the development of new battery catalyst materials.</p> Graphical abstract

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Highly efficient bifunctional zeolitic imidazolate framework-derived carbon-supported platinum-based nanocatalysts for enhancing methanol oxidation reaction and oxygen reduction reaction

  • 期刊论文

  • 发表日期：

    2025年1月25日

查看全文
  • Yuting Chen,
  • Wei Sun,
  • Jiajia Yao,
  • Zhenyao Yang,
  • Qingxin Wang,
  • Chuanyan Xu,
  • Guohong Ren,
  • Zhongsu Liu,
  • Xiaohong Liu

摘要

It is considerably significant and challenging to prepare platinum (Pt)-based catalysts with high activity and stability for the development of direct methanol fuel cells (DMFCs). On that account, we used Pt nanoparticles (NPs) as the core, coated zeolitic imidazolate framework-8 (ZIF-8), silicon dioxide (SiO2) and Pt NPs on their surfaces. Afterward, the SiO2 was etched away to prepare Pt-based nanomaterials with core-shell structure, which were named Pt@ZIF-8/Pt. Simultaneously, the electrocatalytic properties of Pt@ZIF-8/Pt nanomaterials catalyzing methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) were tested under alkaline conditions. The mass and specific activities of Pt@ZIF-8/Pt-12 for MOR were 3285.07 mA mgPt−1 and 1.12 mA cm−2 correspondingly. The limiting current densities (LCD), initial potentials (Eonset) and half-wave potentials (E1/2) for the catalytic ORR of sample Pt@ZIF-8/Pt-12 were 6.24 mA cm−2, 1.04 V and 0.83 V, respectively. Last but not least, zinc-air battery was assembled utilizing the Pt@ZIF-8/Pt-12 catalyst. The open circuit potential and maximum power density of the zinc-air battery were 1.48 V and 120.8 mW cm−2. As evidently demonstrated by our research findings, it still maintained excellent stability after 600 h of cyclic charge and discharge tests. As a result, this research not only provides enlightening guidance for catalyst design for DFMCs and zinc-air batteries, but also accelerates the development of new battery catalyst materials.

Graphical abstract