多晶型MnO2-Ru复合催化剂的制备及其电催化水解析氧性能的研究

摘要/Abstract

摘要： 在二氧化锰(MnO₂)中引入杂原子是调整电化学水氧化催化活性位点的有效方法。在电催化析氧反应(OER)中,虽然已经研究出了许多MnO₂的改性方法,但很少有研究以MnO₂为主体,讨论MnO₂晶型对催化活性的影响。基于此,本文制备了4种晶型的MnO₂(α-MnO₂、β-MnO₂、γ-MnO₂和δ-MnO₂),并系统地研究了Ru加入MnO₂制备得到的催化剂(x-MnO₂-Ru)的OER性能。线性扫描伏安法和计时电位法测试结果表明,β-MnO₂在Ru加入后得到的催化剂(β-MnO₂-Ru)电化学性能最佳,在电流密度为10 mA·cm^-2时拥有300 mV的较低过电位,而且运行24 h后仍保持较好的催化活性。结合表征发现,β-MnO₂-Ru具有较多的Mn³⁺和缺陷氧空位,从而具有优异的电催化性能。

关键词: 二氧化锰, 多晶型, 钌, 析氧反应, 电解水, 催化活性, 电流密度

Abstract: The introduction of heteroatoms into manganese dioxide (MnO₂) is an effective method to adjust the active site of electrochemical water oxidation catalysis. Although many modification methods for MnO₂ have been studied in electrocatalytic oxygen evolution reaction (OER), few studies have focused on the influence of regulating different crystal forms of MnO₂ on catalytic activity. This article prepared four different crystal forms of MnO₂ (α-MnO₂, β-MnO₂, γ-MnO₂ and δ-MnO₂), and systematically studied the catalytic performance of the catalyst (x-MnO₂-Ru) prepared by adding Ru to α-MnO₂, β-MnO₂, γ-MnO₂ and δ-MnO₂ for OER. The results of linear sweep voltammetry and chronopotentiometry measurements show that the catalyst prepared by adding Ru to β-MnO₂ (β-MnO₂-Ru) has the best electrochemical performance. β-MnO₂-Ru shows a low overpotential (300 mV at 10 mA·cm^-2) and outstanding catalytic activity with small degradation after 24 h operation. It is found that β-MnO₂-Ru exhibits excellent electrocatalytic performance due to its abundance of Mn³⁺and defect oxygen vacancies.

Key words: manganese dioxide, polymorph, ruthenium, oxygen evolution reaction, electrolyzed water, catalytic activity, current density

中图分类号:

TQ032.4

李佳, 袁仲纯, 姚梦琴, 刘飞, 马俊. 多晶型MnO₂-Ru复合催化剂的制备及其电催化水解析氧性能的研究[J]. 人工晶体学报, 2024, 53(2): 336-343.

LI Jia, YUAN Zhongchun, YAO Mengqin, LIU Fei, MA Jun. Preparation of Polymorph MnO₂-Ru Composite Catalyst and Its Electrocatalytic Performance for Oxygen Evolution in Water[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(2): 336-343.

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多晶型MnO₂-Ru复合催化剂的制备及其电催化水解析氧性能的研究

Preparation of Polymorph MnO₂-Ru Composite Catalyst and Its Electrocatalytic Performance for Oxygen Evolution in Water

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