<br>低温合成高熵非晶金属氧化物（HEO）以增强析氧性能,Dalton Transactions

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低温合成高熵非晶金属氧化物（HEO）以增强析氧性能
Dalton Transactions ( IF 3.5 ) Pub Date : 2024-01-30 , DOI: 10.1039/d4dt00074a
Arpeeta Hota _{1,

2} , Jiban K Das _{1,

2} , Prasanna K Panda _{1,

2} , Asim A Mohammed _{1,

2} , Avijit Biswal ₃ , Benadict Rakesh _{1,

2} , B C Tripathy _{1,

2}

Affiliation

通过一步水热过程将多种金属离子合理设计成高熵氧化物电极材料，适用于通过简单的水电解产生氧分子（O ₂ ）。其成本效益、高性能和耐用性是非贵重高熵多元金属基电催化剂的关键因素，可以用作替代贵重催化剂的可替代催化剂。本文报道了高熵非晶金属氧化物花椰菜型形貌的低温合成，并研究了它们对析氧反应（OER）的电化学性能。多金属离子（Mn ²⁺ 、Fe ³⁺ 、Co ²⁺ 、Ni ²⁺ 、Cu ²⁺ ）氧化物电极材料表现出可接受的析氧反应（OER），在电流密度为10 mA时过电势为290 mV cm ^-2和较低的塔菲尔斜率值分别为85 mV dec ^-1 。此外，20小时的耐久性测试（过电势变化可以忽略不计）显示了改性电极材料在恶劣碱性介质中的功效。观察到的OER电化学结果对应于活性材料的无定形性质，其呈现花椰菜型形态，具有大的比表面积（240 m ² g ^-1 ）并提供更高的电化学活性位点。因此，后稳定性表征研究（例如 PXRD、FESEM、TEM 和 XPS）为理解高熵非晶金属氧化物的后结构和形态结果提供了更多信息。

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Low-temperature synthesis of high-entropy amorphous metal oxides (HEOs) for enhanced oxygen evolution performance

The rational design of multiple metal ions into high-entropy oxide electrode material via a single-step hydrothermal process is applicable to the evolution of oxygen molecules (O₂) through simple water electrolysis. Their cost-effectiveness, high performance, and durable nature are the key factors of non-precious high-entropy multiple metal-based electrocatalysts, which can be used as replaceable catalysts instead of precious ones. This article reports a low-temperature synthesis of the cauliflower-type morphology of high-entropy amorphous metal oxides, and their electrochemical performances towards the oxygen evolution reaction (OER) are investigated. The multiple metal ion (Mn²⁺, Fe³⁺, Co²⁺, Ni²⁺, Cu²⁺) oxide electrode material shows an acceptable oxygen evolution reaction (OER) with an overpotential of 290 mV at a current density of 10 mA cm⁻² and a lower Tafel slope value of 85 mV dec⁻¹, respectively. Moreover, the 20 h durability test with negligible change in overpotential shows the efficacy of the modified electrode material in harsh alkaline media. The observed electrochemical results towards the OER correspond to the amorphous nature of the active material that displayed a cauliflower-type morphology, having a large specific surface area (240 m² g⁻¹) and providing higher electrochemical active sites as well. Consequently, post-stability characterization studies (such as PXRD, FESEM, TEM, and XPS) provide more information for understanding the post-structural and morphological results of the high-entropy amorphous metal oxide.

更新日期：2024-01-30

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