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相关概念视频

Subatomic Particles03:37

Subatomic Particles

Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

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相关实验视频

Updated: Jun 25, 2026

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
07:08

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Published on: January 17, 2017

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原子稳定基于Pt的金属间纳米粒子.

Zhongliang Huang1,2, Yingru Wang3, Jing Xia4

  • 1State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Science advances
|October 4, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种"原子"策略,以防止在高温催化中以为基础的纳米粒子聚合. 这种方法显著提高了氧气还原反应和燃料电池的性能,在长时间使用中保持活性.

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A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes
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In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
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科学领域:

  • 材料科学 材料科学 材料科学
  • 催化剂是一种催化剂.
  • 电化学 电化学 电化学

背景情况:

  • 基于的纳米粒子 (NP) 对于催化是至关重要的,但在操作条件下容易聚合和烧结.
  • 稳定这些NP对于保持催化活性和耐用性至关重要.

研究的目的:

  • 为在高温下稳定- (PtCo) 纳米粒子 (NP) 制定一个强大的战略.
  • 为了提高PtCo NP的催化性能,用于氧降解反应 (ORR) 和燃料电池应用.

主要方法:

  • 引入了一个"原子"概念,涉及M-N-C材料和Pt-M-N协调.
  • 用各种金属 (Zn,Mn,Fe,Ni,Co,Cu) 测试该策略的多功能性,以稳定基于Pt的NP.
  • 评估稳定NP在氧降解反应和燃料电池循环中的性能.

主要成果:

  • 在高温下使用"原子"策略证明了稳定的PtCo NP结构.
  • 在ORR与g-Zn-N-C/PtCo.相比,获得了2.99 A mgPt-1的质量活性 (MA).
  • 在燃料电池中经过9万个循环后,维持了初始MA的79.3%,显示出出色的耐用性.

结论:

  • "原子"策略为稳定基于Pt的NP提供了一种多功能和有效的方法.
  • 这种方法显著提高ORR和燃料电池的催化性能和耐用性.
  • 预计这些发现将激发人们对各种应用稳定金属纳米粒子的广泛兴趣.