纳米层压三元过渡金属碳化物（MAX 相）衍生的核壳结构电催化剂用于碱性电解质中的析氢和析氧反应,The Journal of Physical Chemistry Letters

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纳米层压三元过渡金属碳化物（MAX 相）衍生的核壳结构电催化剂用于碱性电解质中的析氢和析氧反应
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-01-10 , DOI: 10.1021/acs.jpclett.2c03230
Youbing Li _{1,

2} , Shuairu Zhu _{1,

3} , Erxiao Wu _{1,

2} , Haoming Ding _{1,

2} , Jun Lu ₄ , Xulin Mu ₅ , Lu Chen _{1,

2} , Yiming Zhang _{1,

2} , Justinas Palisaitis ₄ , Ke Chen _{1,

2} , Mian Li _{1,

2} , Pengfei Yan ₅ , Per O Å Persson ₄ , Lars Hultman ₄ , Per Eklund ₄ , Shiyu Du _{1,

2} , Yongbo Kuang _{1,

6} , Zhifang Chai _{1,

2} , Qing Huang _{1,

2}

Affiliation

开发用于析氢反应 (HER) 和析氧反应 (OER) 的丰富、廉价和高活性催化剂对于制氢非常重要。纳米层压三元过渡金属碳化物（MAX 相）及其衍生的二维过渡金属碳化物（MXenes）在电催化剂应用中引起了相当大的兴趣。在此，四种新的 MAX@MXene 核壳结构（Ta ₂ CoC@Ta ₂ CT _x、Ta ₂ NiC@Ta ₂ CT _x、Nb ₂ CoC@Nb ₂ CT _x和 Nb ₂ NiC@Nb ₂ CT _{x ）})，其中核心区域是 Co/Ni-MAX 相，而边缘区域是 MXenes。在碱性电解质条件下，Ta ₂ CoC@Ta ₂ CT _x核壳结构在以 MXenes 为活性位点的 HER 过程中显示出 239 mV 的过电位和出色的稳定性。对于 OER，Ta ₂ CoC@Ta ₂ CT _x核壳结构显示出 373 mV 的过电势和较小的 Tafel 图（56 mV dec ^–1)，它保持了块状晶体结构，并产生了通过表面重建形成的钴基羟基氧化物作为活性位点。考虑到 MAX 相丰富的化学成分和结构，这项工作为设计多功能电催化剂提供了一种新策略，也为进一步开发用于清洁能源应用的 MAX 相基材料铺平了道路。

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Nanolaminated Ternary Transition Metal Carbide (MAX Phase)-Derived Core–Shell Structure Electrocatalysts for Hydrogen Evolution and Oxygen Evolution Reactions in Alkaline Electrolytes

The development of abundant, cheap, and highly active catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is important for hydrogen production. Nanolaminate ternary transition metal carbides (MAX phases) and their derived two-dimensional transition metal carbides (MXenes) have attracted considerable interest for electrocatalyst applications. Herein, four new MAX@MXene core–shell structures (Ta₂CoC@Ta₂CT_x, Ta₂NiC@Ta₂CT_x, Nb₂CoC@Nb₂CT_x, and Nb₂NiC@Nb₂CT_x), in which the core region is Co/Ni-MAX phases while the edge region is MXenes, have been prepared. Under alkaline electrolyte conditions, the Ta₂CoC@Ta₂CT_x core–shell structure showed an overpotential of 239 mV and excellent stability during the HER with MXenes as the active sites. For the OER, the Ta₂CoC@Ta₂CT_x core–shell structure showed an overpotential of 373 mV and a small Tafel plot (56 mV dec^–1), which maintained a bulk crystalline structure and generated Co-based oxyhydroxides that formed by surface reconstruction as active sites. Considering rich chemical compositions and structures of MAX phases, this work provides a new strategy for designing multifunctional electrocatalysts and also paves the way for further development of MAX phase-based materials for clean energy applications.

更新日期：2023-01-10

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