Ag2O-PrO2/γ-Al2O3 电催化剂对 OER 和 ORR 的高效双功能电化学活性,International Journal of Energy Research

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Ag2O-PrO2/γ-Al2O3 电催化剂对 OER 和 ORR 的高效双功能电化学活性
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-06-07 , DOI: 10.1002/er.8133
Mariam Khan ₁ , Naveed Kausar Janjua ₂ , Awais Ahmad ₃ , Rafael Luque ₃ , Abdullah A. Al‐Kahtani ₄ , Ammar Mohamed Tighezza ₄

Affiliation

氧还原和析出反应（ORR/OER）是许多能源产生和储存装置的基石，对许多电催化反应都有影响。这些反应的缓慢动力学在电极表面上是一个具有挑战性的情况，它会施加很大的过电位并影响燃料电池的能量输出。虽然铂基电极材料对 ORR/OER 具有优异的活性，但其高成本限制了燃料电池的商业化。针对这一问题，无铂电极材料引起了科学家们的考虑。本工作旨在研究xAg ₂ O-yPrO ₂ /γ-Al ₂ O _{3表面的氧还原反应和水氧化反应。}/玻璃碳。通过循环伏安法在这些纳米催化剂的表面上电化学研究了 ORR，而在碱性介质中通过循环伏安法和线性扫描伏安法研究了 OER。研究了催化剂表面ORR的机理，结果表明，在10PrO ₂ /γ-Al ₂ O ₃ /Glassy-Carbon的情况下，ORR遵循两个电子路径，而在其他催化剂表面发现了四个电子还原路径，这表明添加银和镨将机制从 2e ^-转变为 4e ^-途径。电催化剂在多次扫描过程中具有稳定性，在 OER/ORR 中没有观察到电极腐蚀。确定了两种反应的不同动力学参数，这证实了催化剂活性表面上的 ORR 和 OER 都是不可逆的并且扩散受控。4Ag ₂ O - 6PrO ₂ /γ-Al ₂ O ₃表明在该系列的其他成员中是精通的电催化剂，具有更大的质量传输和扩散系数值。所有电催化剂的双功能性都通过它们在碱性介质中的电化学响应来验证。这些电催化剂对氧气的催化还原和水的氧化模仿了它们作为电池电极材料的潜力，以及用于能源生产的单元化再生燃料电池 (URFC) 技术，以替代铂电极。

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Highly effective bi-functional electrochemical activity of Ag2O-PrO2/γ-Al2O3 electrocatalysts towards OER and ORR

The oxygen reduction and evolution reaction (ORR/OER), are the keystones for many energy generating and storage devices, have influence with many electrocatalytic reactions. The sluggish kinetics of these reaction is a challenging situation on the surface of electrodes which imposes large over-potential and affects the energy output of fuel cells. Although the platinum-based electrode materials have excellent activity toward ORR/OER but their high cost limits commercialization of fuel cells. To deal with this problem, platinum-free electrode materials has aroused the considerations of scientists. The present work is proposed to study the oxygen reduction reaction and water oxidation on the surface of xAg₂O-yPrO₂/γ-Al₂O₃/Glassy-Carbon. The ORR was studied electrochemically via cyclic voltammetry on the surface of these nano-catalysts while the OER was investigated via cyclic voltammetry and linear sweep voltammetry in alkaline media. The mechanism of ORR on catalysts surface was enquired and the results indicate that ORR followed two electrons pathway in case of 10PrO₂/γ-Al₂O₃/Glassy-Carbon while four electrons reduction pathway is identified on surface of others catalysts which divulged that addition of silver with praseodymium shifted the mechanism from 2e⁻ to 4e⁻ pathway. The electrocatalysts featured the stability during multiple scans and no corrosion of electrode in OER/ORR is observed. Different kinetic parameters for both reactions are determined which affirmed that both ORR and OER on the active surface of catalysts is irreversible and diffusion controlled. 4Ag₂O-6PrO₂/γ-Al₂O₃ is indicated to be proficient electro-catalyst among other members of the series, having greater value of mass transport and diffusion coefficients. The bi-functionality of all electrocatalysts are verified by their electrochemical responses in alkaline medium. The catalytic reduction of oxygen and oxidation of water by these electro-catalysts imitates their potential as electrode material in batteries and unitized regenerative fuel cells (URFC) technology for energy production as substitute of platinum electrode.

更新日期：2022-06-07

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