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

Abstract

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

CLC Number:

TQ032.4

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

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