Ca3Co4O9-Ba0.5Sr0.5Co0.8Fe0.2O3 composite catalyst for oxygen evolution reaction

IF 2.6 4区化学 Q3 ELECTROCHEMISTRY

Journal of Solid State Electrochemistry Pub Date : 2024-07-02 DOI:10.1007/s10008-024-05992-6

Sávio M. Lopes, Thayse R. Silva, Rafael A. Raimundo, Pamala S. Vieira, Allan J. M. Araújo, Fausthon F. da Silva, Ricardo F. Alves, Flavia de M. Aquino, Daniel A. Macedo

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Abstract

The development of new electrocatalysts for the oxygen evolution reaction (OER) is fundamental for water-splitting devices. In this work, a novel composite based on Ca₃Co₄O₉ (C349) and Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃ (BSCF) was synthesized and characterized using XRD with Rietveld refinement, SEM, EDX, and FTIR. The electrochemical properties were evaluated in a KOH alkaline medium. The composite exhibited exceptional OER electrocatalytic activity, showing an overpotential of 389 mV at 10 mA cm⁻², which is lower than the pristine BSCF and C349 samples. Tafel slope of 77 mV dec−1 and double-layer capacitance (Cdl) of 4.37 mF were obtained, indicating an ECSA of 109.25 cm². The composite also demonstrated a high turnover frequency (TOF) of 1.9 × 10⁻³ mol O₂ s⁻¹, underscoring its superior catalytic efficiency. Impedance spectroscopy revealed that the C349 and BSCF samples exhibited greater limitations in charge transfer compared to the composite. These results highlight the composite’s potential as a highly effective OER electrocatalyst, leveraging the synergistic effects of C349 and BSCF.

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用于氧进化反应的 Ca3Co4O9-Ba0.5Sr0.5Co0.8Fe0.2O3 复合催化剂

开发新的氧进化反应（OER）电催化剂对水分离装置至关重要。在这项工作中，合成了一种基于 Ca3Co4O9 (C349) 和 Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) 的新型复合材料，并使用 XRD 与 Rietveld 精化、SEM、EDX 和 FTIR 对其进行了表征。在 KOH 碱性介质中对其电化学特性进行了评估。该复合材料表现出卓越的 OER 电催化活性，在 10 mA cm-2 时的过电位为 389 mV，低于原始 BSCF 和 C349 样品。塔菲尔斜率为 77 mV dec-1，双层电容（Cdl）为 4.37 mF，表明 ECSA 为 109.25 cm2。该复合材料还显示出 1.9 × 10-3 mol O2 s-1 的高翻转频率 (TOF)，凸显了其卓越的催化效率。阻抗光谱显示，与复合材料相比，C349 和 BSCF 样品在电荷转移方面表现出更大的局限性。这些结果凸显了该复合材料利用 C349 和 BSCF 的协同效应作为高效 OER 电催化剂的潜力。

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来源期刊

Journal of Solid State Electrochemistry 工程技术-电化学

CiteScore

4.80

自引率

4.00%

发文量

227

审稿时长

4.1 months

期刊介绍： The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.