| 金属-氧共价性增强的缺陷态高熵岩盐型氧化物用于电催化析氧 |
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| 引用本文： | 刘芳名,于勐,陈祥,李金翰,刘欢欢,程方益. 金属-氧共价性增强的缺陷态高熵岩盐型氧化物用于电催化析氧[J]. 催化学报, 2022, 43(1): 122-129 |
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| 作者姓名： | 刘芳名 于勐 陈祥 李金翰 刘欢欢 程方益 |
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| 作者单位： | 南开大学化学学院, 先进能源材料化学教育部重点实验室, 新能源转化与存储交叉科学中心, 天津300071 |
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| 基金项目： | 国家重点研发计划纳米科技专项(2017YFA0206700);国家自然科学基金(21925503,21871149,51571125,51622102);111引智计划(B12015);中央高校基本科研业务费专项资金. |
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| 摘 要： | 高熵材料可以在单一晶相中引入五种或五种以上元素以优化电子结构和配位环境,可作为一类新兴的电催化剂.本文制备了一种岩盐型高熵氧化物Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O(HEO)用于催化氧析出反应(OER).由于相邻的不同金属离子晶格失配,所制备的HEO具有丰富的缺陷.此外,电负性更小的Mg和Zn元素的存在...
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| 关 键 词： | 高熵材料 岩盐型氧化物 氧析出反应 电催化剂 缺陷 金属-氧共价性 |
Defective high-entropy rocksalt oxide with enhanced metal-oxygen covalency for electrocatalytic oxygen evolution |
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| Fangming Liu,Meng Yu,Xiang Chen,Jinhan Li,Huanhuan Liu,Fangyi Cheng. Defective high-entropy rocksalt oxide with enhanced metal-oxygen covalency for electrocatalytic oxygen evolution[J]. Chinese Journal of Catalysis, 2022, 43(1): 122-129 |
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| Authors: | Fangming Liu Meng Yu Xiang Chen Jinhan Li Huanhuan Liu Fangyi Cheng |
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| Affiliation: | (Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center,College of Chemistry,Nankai University,Tianjin 300071,China) |
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| Abstract: | High-entropy materials are emerging electrocatalysts by integrating five or more elements into one single crystallographic phase to optimize the electronic structures and geometric environments. Here, a rocksalt-type high-entropy oxide Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O (HEO) is developed as an electro-catalyst towards the oxygen evolution reaction (OER). The obtained HEO features abundant cation and oxygen vacancies originating from the lattice mismatch of neighboring metal ions, together with enlarged Co/Ni-O covalency due to the introduction of less electronegative Mg and Zn. As a result, the HEO exhibits superior intrinsic OER activities, delivering a turnover frequency (TOF) 15 and 84 folds that of CoO and NiO at 1.65 V, respectively. This study provides a mechanistic understanding of the enhanced OER on HEO and demonstrates the potential of high-entropy strategy in developing efficient oxygen electrocatalysts by elaborately incorporating low-cost elements with lower elec-tronegativity. |
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| Keywords: | High-entropy material Rocksalt oxide Oxygen evolution reaction Electrocatalyst Defect Metal-oxygen covalency |
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