Boosting the Stability of Oxygen Vacancies in α-Co(OH)2 Nanosheets with Coordination Polyhedrons as Rivets for High-Performance Alkaline Hydrogen Evolution Electrocatalyst,Advanced Energy Materials

当前位置： X-MOL 学术 › Adv. Energy Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Boosting the Stability of Oxygen Vacancies in α-Co(OH)2 Nanosheets with Coordination Polyhedrons as Rivets for High-Performance Alkaline Hydrogen Evolution Electrocatalyst
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-09-15 , DOI: 10.1002/aenm.202202351
Li‐Wen Jiang ₁ , Yuan Huang _{1,

2} , Yang Zou ₁ , Chao Meng ₁ , Yi Xiao ₃ , Hong Liu _{1,

4} , Jian‐Jun Wang _{1,

2}

Affiliation

The strong alkaline electrolytes are utilized in various key electrochemical applications and the severe corrosion by hydroxyl ions endows the development of high-performance electrode materials with a great challenge. Here, an effective strategy is demonstrated to stabilize α-Co(OH)₂ under harsh alkaline electrochemical condition by coordination polyhedron pinning (MoO₄²⁻, WO₄²⁻) on the surface for hydrogen evolution reaction (HER). The addition of MoO₄²⁻ in 1 m KOH can inhibit the attack of hydroxyl ions on oxygen vacancies in α-Co(OH)₂, and simultaneously modulate the electronic structure of active sites for HER. The theoretical calculations and experimental results reveal that MoO₄²⁻ can be riveted on the surface of α-Co(OH)₂ to greatly stabilize oxygen vacancies and inhibit the formation of soluble ions of Co(OH)₃⁻. The resultant active sites exhibit reduced maximum energy barriers for the optimized alkaline HER. Additionally, MoO₄²⁻ near the interface between α-Co(OH)₂ and electrolyte can alleviate the accumulation of hydroxyl ions on α-Co(OH)₂ due to the electrostatic repulsion, improving the stability toward HER. This work offers insight into the role of coordination polyhedron ions in regulating and enhancing the stability of α-Co(OH)₂ for various potential electrochemical applications in alkaline electrolyte.

中文翻译：

以配位多面体为铆钉提高 α-Co(OH)2 纳米片中氧空位的稳定性，用于高性能碱性析氢电催化剂

强碱性电解质被用于各种关键的电化学应用，氢氧根离子的严重腐蚀给高性能电极材料的开发带来了巨大的挑战。_{在这里，通过配位多面体钉扎（MoO 4}²⁻ , WO ₄²⁻）在析氢反应 (HER) 表面上，证明了在苛刻的碱性电化学条件下稳定 α-Co(OH) ₂的有效策略。在1 m KOH中加入MoO ₄²⁻可以抑制羟基离子对α-Co(OH) _{2中氧空位的攻击}，同时调节 HER 活性位点的电子结构。理论计算和实验结果表明，MoO ₄²⁻可以铆接在α-Co(OH) ₂表面，极大地稳定氧空位，抑制Co(OH) ₃⁻可溶性离子的形成。所得活性位点对优化的碱性 HER 表现出降低的最大能垒。_{此外，在α-Co(OH) 2}与电解质界面附近的MoO ₄²⁻可以减轻羟基离子在α-Co(OH) _{2上的积累}由于静电排斥，提高了对HER的稳定性。这项工作深入了解配位多面体离子在调节和增强 α-Co(OH) ₂的稳定性方面的作用，以用于碱性电解质中的各种潜在电化学应用。

更新日期：2022-09-15

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南