Hetero-nanojunction armored with carbon layer for boosting water oxidation over RuO2 in acid,Inorganic Chemistry Frontiers

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Hetero-nanojunction armored with carbon layer for boosting water oxidation over RuO2 in acid
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-09 , DOI: 10.1039/d4qi00932k
Fanfan Shang ₁ , Huijie He ₁ , Yuan Lin ₁ , Bei An ₁ , Hairui Cai _{1,

2,

3} , Xiaoqian Li ₁ , Weitong Wang ₁ , Chao Liang _{1,

2,

3} , Shengchun Yang _{1,

2,

3} , Bin Wang _{1,

2,

3}

Affiliation

In this work, a high-performance electrocatalyst, (Co₃O₄|RuO₂)@C, was developed for the oxygen evolution reaction (OER) in acid. Despite the low loading of Ru (0.66 wt%) and Co (0.35 wt%), the catalyst exhibited remarkable performance, achieving an overpotential of 202 mV at 10 mA cm⁻². Notably, when employed as an anodic catalyst in a proton exchange membrane (PEM) electrolyzer, (Co₃O₄|RuO₂)@C demonstrated exceptional stability, operating continuously for 300, 100, and 100 h at current densities of 10, 50, and 100 mA cm⁻², respectively. Experiments and theoretical investigations revealed that the regulated electronic structure of RuO₂ by the Co₃O₄|RuO₂ nanojunction, coupled with the carbon coating layer, led to excellent OER performance of (Co₃O₄|RuO₂)@C. The construction of the Co₃O₄|RuO₂ nanojunction triggered the electron transfer from Co₃O₄ to RuO₂, decreasing the energy barrier of *O → *OOH and mitigating the over-oxidation of Ru sites. Furthermore, the carbon layer surrounding the crystalline Co₃O₄|RuO₂ facilitated mass/charge transfer across the electrolyte-catalyst interface and acted as a protective “chain mail” to enhance the durability of (Co₃O₄|RuO₂)@C.

中文翻译：

铠装碳层的异质纳米结可促进酸中 RuO2 的水氧化

在这项工作中，开发了一种用于析氧反应（OER）的高性能电催化剂（Co ₃ O ₄ |RuO ₂ ）@C在酸中。尽管Ru（0.66 wt%）和Co（0.35 wt%）的负载量较低，但该催化剂表现出卓越的性能，在10 mA cm ⁻² 下实现了202 mV的过电势。值得注意的是，当在质子交换膜（PEM）电解槽中用作阳极催化剂时，(Co ₃ O ₄ |RuO ₂ )@C 表现出卓越的稳定性，分别在10、50和100 mA cm ⁻² 的电流密度下连续运行300、100和100 h。实验和理论研究表明，Co ₃ O ₄ |RuO ₂ 纳米结可调节 RuO ₂ 的电子结构，并结合碳涂层的存在使得(Co ₃ O ₄ |RuO ₂ )@C具有优异的OER性能。 Co ₃ O ₄ |RuO ₂ 纳米结的构建触发了 Co ₃ O ₄ 转化为 RuO ₂ ，降低 *O → *OOH 的能垒并减轻 Ru 位点的过度氧化。此外，围绕晶体 Co ₃ O ₄ |RuO ₂ 的碳层促进了电解质-催化剂界面上的质量/电荷转移，并充当了保护“链甲”以增强 (Co ₃ O ₄ |RuO ₂ )@C 的耐用性。

更新日期：2024-07-10

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