纳米多孔<strong>Fe-Si-B-P</strong>的脱合金制备及其电化学性能

doi:10.11901/1005.3093.2022.602

材料研究学报

2023, Vol. 37

Issue (11): 801-808 DOI: 10.11901/1005.3093.2022.602

研究论文

本期目录 | 过刊浏览

纳米多孔Fe-Si-B-P的脱合金制备及其电化学性能

赖祥晔, 翁楠, 池昱晨, 秦凤香(

)

南京理工大学材料科学与工程学院南京 210094

Formation and Electrochemical Properties of Nanoporous Fe-Si-B-P by Dealloying

LAI Xiangye, WENG Nan, CHI Yuchen, QIN Fengxiang(

)

School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

引用本文:

赖祥晔, 翁楠, 池昱晨, 秦凤香. 纳米多孔Fe-Si-B-P的脱合金制备及其电化学性能[J]. 材料研究学报, 2023, 37(11): 801-808.
Xiangye LAI, Nan WENG, Yuchen CHI, Fengxiang QIN. Formation and Electrochemical Properties of Nanoporous Fe-Si-B-P by Dealloying[J]. Chinese Journal of Materials Research, 2023, 37(11): 801-808.

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摘要:

在0.05 mol/L H₂SO₄溶液中对773~833 K热处理后的Fe₇₆Si₉B₁₀P₅非晶合金进行脱合金处理，采用脱合金法制备出Fe-Si-B-P纳米多孔材料。利用X射线衍射仪、扫描电子显微镜、透射电子显微镜等手段以及电化学工作站表征其表面形貌、微观结构和组成，研究其电化学性能。结果表明，热处理后的Fe₇₆Si₉B₁₀P₅非晶合金晶化为α-Fe、Fe₂B和Fe₃P相，在脱合金过程中α-Fe晶粒优先溶解形成纳米多孔结构，随着热处理温度从773 K提高到833 K材料中纳米多孔的孔径从150 nm增大到260 nm。同时，较大的比表面积提供更多的催化活性位点使纳米多孔Fe-Si-B-P具有比Fe₇₆Si₉B₁₀P₅非晶合金更优异的氧化还原性能。

关键词 ：金属材料, 非晶晶化, 脱合金, 纳米多孔结构, 氧化还原反应

Abstract：

Fe₇₆Si₉B₁₀P₅ amorphous alloys annealed at 773~833 K with heterogeneous microstructure consisting of α-Fe, Fe₂B and Fe₃P phases, were de-alloyed in 0.05 mol/L H₂SO₄ solution. The porous structure was formed due to the preferential dissolution of α-Fe phase in the form of micro-coupling cells between α-Fe phase and cathodic residual phases. The size of nanopores increased from 150 nm to 260 nm with the temperature increasing from 773 K to 883 K. The nanoporous Fe-Si-B-P electrode showed much superior redox performance compared with Fe₇₆Si₉B₁₀P₅ amorphous alloy, which was ascribed to its large specific area and more electrochemical active sites.

Key words： metallic materials crystallization of amorphous alloys dealloying nanoporous structure redox reaction

收稿日期: 2022-11-14

ZTFLH:

TG403.40

基金资助:国家自然科学基金(52371157);国家自然科学基金(51671106)

通讯作者: 秦凤香，教授，fengxiangqin@njust.edu.cn，研究方向为金属纳米结构功能材料及非晶合金的设计与应用

Corresponding author: QIN Fengxiang, Tel: (025)84315606, E-mail: fengxiangqin@njust.edu.cn

作者简介: 赖祥晔，女，2001年生，硕士生

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图1 Fe76Si9B10P5非晶合金的DSC曲线

图2 Fe76Si9B10P5非晶合金及其在不同温度热处理后的XRD谱

图3 Fe76Si9B10P5非晶合金及其在773 K热处理后的明场图像和相应的选区衍射图

图4 在不同温度热处理的Fe76Si9B10P5合金在0.05 mol/L H2SO4溶液中脱合金处理后的XRD谱

图5 纯Fe、Fe85B15合金、Fe3P合金、Fe76Si9B10P5非晶合金和热处理Fe76Si9B10P5合金在0.05 mol/L H2SO4溶液中的开路电位与浸泡时间的关系

图6 Fe76Si9B10P5合金在773、793、813和833 K温度热处理后在0.05 mol/L H2SO4溶液中脱合金处理样品的SEM照片，内嵌图片为横截面SEM照片

图7 Fe76Si9B10P5合金在不同温度热处理后在0.05 mol/L H2SO4溶液中脱合金处理样品的平均孔径

图8 在773 K热处理的Fe76Si9B10P5合金分别在0.005、0.01和0.05 mol/L的H2SO4溶液中脱合金处理600、1800、3600 s后所得样品的SEM照片

图9 Fe76Si9B10P5非晶合金和脱合金Fe76Si9B10P5合金在6 mol/L KOH溶液中的CV曲线

图10 脱合金处理Fe76Si9B10P5合金在6 mol/L的 KOH溶液中的CV曲线和在不同扫描速率下氧化峰/还原峰的峰值电流密度的变化

图11 脱合金处理的Fe76Si9B10P5合金在CV测试后的SEM照片

图12 热处理Fe-Si-B-P合金脱合金的机制示意图

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