铈掺杂二氧化钌电催化剂的酸性析氧性能增强及机理.
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| Title: | 铈掺杂二氧化钌电催化剂的酸性析氧性能增强及机理. |
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| Alternate Title: | Enhanced acidic oxygen evolution performance and mechanism of cerium-doped ruthenium dioxide electrocatalyst. |
| Authors: | 李青雨1 lqy915915@163.com, 郭梦雨1, 张晓燕1, 张立学1 zhanglx@qdu.edu.cn |
| Source: | Clean Coal Technology. May2026, Vol. 32 Issue 5, p67-76. 10p. |
| Subject Terms: | *Oxygen evolution reactions, *Ruthenium oxides, *Durability, *Catalytic activity, *Proton exchange membrane fuel cells, *Cerium group, *Electrocatalysts, *Water electrolysis |
| Abstract (English): | The continuous consumption of traditional fossil energy exacerbates the energy crisis and environmental problems, and the development of clean and renewable energy is regarded as an urgent global challenge. Hydrogen, as a high-energy-density and sustainable energy carrier, is witnessing an increasing demand. Among various hydrogen production technologies, water electrolysis for hydrogen production is considered the most promising pathway because it can be coupled with renewable energy and is characterized by cleanliness and sustainability. In particular, proton exchange membrane (PEM) water electrolysis technology is widely noted for its advantages of high efficiency, fast response, and high gas purity; however, stringent requirements are imposed on the oxygen evolution reaction (OER) catalyst by the strongly acidic environment at the anode. RuO2 is commonly employed as a catalyst in PEM water electrolysis. Nevertheless, under high voltage, RuO2 is readily oxidized to soluble Ru species (Run+, n＞4), whereby structural deactivation is induced and its long-term stability is compromised. To address this issue, a heteroatom doping strategy is developed, by which the performance of RuO2 is enhanced through Ce doping. A series of composite electrode materials with different Ru/Ce ratios (Cex -RuyO2/CP) are fabricated on carbon paper (CP) via a drop-coating and annealing method, and their catalytic performance and stability for the acidic OER are systematically investigated in 0.5 mol/L H2SO4 . The morphology and phase structure of the materials are revealed by SEM and XRD characterization, respectively. Electrochemical tests demonstrate that superior catalytic activity is exhibited by the Ce0.1-Ru0.9O2 /CP material compared with RuO2/CP. Overpotentials of 238 mV and 342 mV are achieved at current densities of 10 mA/cm² and 100 mA/cm², respectively, which are significantly lower than those of RuO2 /CP (270 mV and 370 mV) . Moreover, a higher electrochemical active surface area and a lower charge transfer resistance are observed for Ce0.1-Ru0.9O2 /CP, indicating more favorable reaction kinetics. Stability tests confirm that stable operation for over 200 h is maintained by the catalyst at 10 mA/cm2 . It is verified that Ce doping effectively enhances the OER activity and stability of RuO2 -based catalysts in acidic media, and an effective reference is thereby provided for the development of efficient and stable anode catalysts for PEM water electrolysis. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): | 传统化石能源的持续消耗加剧了能源危机与环境问题, 发展清洁可再生能源成为全球性紧迫 挑战. 氢气作为一种高能量密度、可持续的能源载体, 其需求日益增长. 在多种制氢技术中, 电解水制 氢可与可再生能源耦合, 具有清洁、可持续的优点, 被视为最具前景的制氢路径. 其中, 质子交换膜 (Proton Exchange Membrane, PEM) 电解水技术因效率高、响应快、气体纯度高等优势受到广泛关注, 但其阳极强酸性环境对氧析出反应 (Oxygen Evolution Reaction, OER) 催化剂提出了严苛要求. RuO2 是目前 PEM 电解水中常用的催化剂, 然而其在高电压下易被氧化为可溶性 Ru 离子 (Run+, n >4), 导致结构失活, 制约了其长期稳定性. 针对这一问题, 研究发展了一种异质元素掺杂策略, 通 过 Ce 掺杂对 RuO2 进行性能强化. 采用滴涂−退火法在碳纸 (Carbon Paper, CP) 上制备了一系列不 同 Ru/Ce 比例 (Cex -RuyO2/CP) 的复合电极材料, 系统考察了其在 0.5 mol/ L H2SO4 中的酸性析氧反应 催化性能与稳定性. SEM 与 XRD 表征分别揭示了材料的形貌特征与物相结构. 电化学测试表明, Ce0.1-Ru0.9O2/CP 材料表现出优于 RuO2/CP 的催化活性, 在 10 和 100 mA/cm² 电流密度下的过电位分 别为 238 和 342 mV, 显著低于 RuO2/CP 的 270 和 370 mV. 此外, Ce0.1-Ru0.9O2 /CP 具有更高的电化学 活性面积和更低的电荷转移电阻, 表明其反应动力学更优. 稳定性测试显示, 该催化剂在 10 mA/cm²下可稳定运行超过 200 h. 研究证实 Ce 掺杂能有效提升 RuO2 基催化剂在酸性介质中的析氧反应活 性和稳定性, 为开发高效、稳定的 PEM 电解水阳极催化剂提供了有效参考. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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