Related Experiment Video
Updated: Sep 19, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Unraveling Double-Exchange Effect Coupling Spin Modulation of Sr2Fe1.5Mo0.5O6-δ Electrocatalyst for Solid Oxide Cells
Yuanfeng Liao1, Jun Liu1, Hao Chen1
1Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of Energy Electrocatalytic Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
None:
Perovskites are promising electrocatalysts for solid oxide cells (SOCs) due to their tunable structures. The reactivity/stability can be effectively enhanced by tuning the spin, whereas few studies have been able to elucidate the correlation between spin and reactivity/stability. Herein, the double-exchange effect coupling spin modulation is studied for Sr2Fe1.3Ni0.2Mo0.5O6, which exhibits a current density of 2.48 A cm-2 with high stability at 800 °C and 1.5 V as the cathode in CO2 reduction. Based on Mössbauer spectroscopy, X-ray absorption spectroscopy, and density functional theory calculations, it is revealed that the doped Ni induces an additional double-exchange effect with enhanced conductivity coupling spin modulation. It produces high-spin Fe4+ (t2g3eg1) with vacant eg orbitals which can accommodate additional electrons from the lone pairs of oxygen, thus facilitating CO2 reduction by enhancing CO2 adsorption and weakening CO adsorption. This work provides a general strategy for the design of SOC electrocatalysts.
Related Concept Videos
Spin–Spin Coupling: One-Bond Coupling
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Thermal and Photochemical Electrocyclic Reactions: Overview
Voltaic/Galvanic Cells
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
NMR Spectroscopy: Spin–Spin Coupling
Ferromagnetism

