小尺寸金属间化合物 FeMnPt 纳米颗粒在酸性和碱性条件下的 HER 电催化剂,ACS Applied Nano Materials

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小尺寸金属间化合物 FeMnPt 纳米颗粒在酸性和碱性条件下的 HER 电催化剂
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2024-04-02 , DOI: 10.1021/acsanm.4c00570
Chun Wu _{1,

2,

3,

4} , Zhiyong Li _{2,

3} , Shizhi Dong ₃ , KanKan Zhou _{2,

3} , Dekang Ding _{2,

3} , Runqing Liu ₁ , Wenli Pei ₄

Affiliation

通过一种简便的一步固相反应方法成功合成了具有细尺寸（4-7 nm）和有序相（ L 1 ₀和L 1 ₂ ）的金属间FeMnPt纳米颗粒。采用尺寸小于10μm的NaCl粉末作为固态分离介质，前驱体与NaCl粉末的质量比设定为1:300；固体反应在780℃、还原气氛（90%Ar+10%H ₂）下进行180分钟。测试了酸性和碱性溶液中的电催化析氢反应（HER）性能。增加固相反应过程中Mn前驱体的量会增加Mn和Pt元素的含量，使晶体结构从L 1 ₀相转变为L 1 ₂相，并增加FeMnPt纳米粒子的晶粒尺寸。比较金属间化合物FeMnPt纳米颗粒在酸性和碱性溶液中的电催化HER性能，发现Mn和Pt含量较高的L 1 ₂ -FeMnPt纳米颗粒在酸性溶液中表现出较低的电催化过电位和较高的比活性。然而，具有较高有序度的含Mn的L 1 ₀ -FeMnPt纳米颗粒在碱性溶液中表现出较低的电催化过电位和较高的电催化活性。不同成分和有序相的金属间化合物 FeMnPt 纳米粒子在酸性和碱性溶液中的电催化 HER 稳定性相当。这项研究为发现用于不同酸性和碱性环境的高效中间析氢催化剂提供了指导。

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Small-Size Intermetallic FeMnPt Nanoparticles Electrocatalyst for HER Under Acidic and Alkaline Conditions

Intermetallic FeMnPt nanoparticles with fine sizes (4–7 nm) and ordered phases (L1₀ and L1₂) were successfully synthesized by a facile one-step solid-state reaction method. NaCl powder with size less than 10 μm was employed as the solid-state isolate medium and the mass ratio of precursors to NaCl powders was set as 1:300; the solid reaction was done at 780 °C under a reducing atmosphere (90% Ar + 10% H₂) for 180 min. The electrocatalytic hydrogen evolution reaction (HER) performances in both acidic and alkaline solutions were tested. Increasing the Mn precursor amounts in the solid-state reaction process would increase the content of Mn and Pt elements, transform the crystal structure from the L1₀-phase to the L1₂-phase, and increase the grain sizes of FeMnPt nanoparticles. Comparing the electrocatalytic HER performance of intermetallic FeMnPt nanoparticles in acidic and alkaline solutions, it was found that the L1₂-FeMnPt nanoparticles with higher Mn and Pt contents presented a low electrocatalytic overpotential and high specific activity in acidic solution. However, the Mn-containing L1₀-FeMnPt nanoparticles with higher ordering degrees showed low electrocatalytic overpotentials and high electrocatalytic activity in alkaline solution. The electrocatalytic HER stabilities of intermetallic FeMnPt nanoparticles with different components and ordered phases were comparable in acidic and alkaline solutions. This study provides the guidance for discovering highly efficient intermediate HER catalysts for servicing different acidic and alkaline environments.

更新日期：2024-04-02

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