将多个催化活性位点集成到一个复合系统中，实现高效、持久的水氧化,ACS Applied Energy Materials

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将多个催化活性位点集成到一个复合系统中，实现高效、持久的水氧化
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2024-01-11 , DOI: 10.1021/acsaem.3c02163
Ranjith Bose _{1,

2} , Hassnain Abbas Khan ₃ , Gajagouni Suryaprakash Goud ₄ , Abhijeet Raj ₅ , Mohamed Ibrahim Hassan Ali ₄ , Mirella Elkadi ₆

Affiliation

开发一种活性、价格实惠且稳定的催化剂，以在水电解过程中有效析氧仍然是当代研究中的一项艰巨任务。析氧反应 (OER) 的缓慢动力学继续阻碍电解过程的整体效率。这里展示了一种综合方法，通过使用合理的策略将双金属氢氧化物 (NiFe(OH) _x ) 与无定形硫化钼 (MoS _x ) 异质结构集成，将多种催化活性组分开发到单个系统中。这种提出的制造策略能够增强催化活性和快速电子转移，通过协同效应和电子相互作用的有效调节，在强碱性介质中产生析氧反应。此外，所得复合电极（MoS _x /NiFe(OH) _x^{/NF）在50 mA cm –2}和47.25 mV dec ^–1下表现出最低的过电势和塔菲尔斜率分别为298 mV ，以及良好的稳定性在大电流下长时间使用48小时而不降解。发现所演示的电极在催化反应后动态地重组表面层的活性相，作为水氧化的有效电极。这些结果不仅导致了稳健有效的电催化剂的开发，而且还为开发可集成到传统催化剂设计中的一种材料中的多组分电催化系统提供了多种可能性。

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Integrating Multiple Catalytic Active Sites into One Composite System for Highly Efficient and Durable Water Oxidation

Developing an active, affordable, and stable catalyst for efficient oxygen evolution during water electrolysis remains a formidable task in contemporary research. The sluggish kinetics of the oxygen evolution reaction (OER) continues to impede the overall efficiency of the electrolysis process. A comprehensive approach is demonstrated here to develop multiple catalytic active components into a single system by means of integrating a bimetallic hydroxide (NiFe(OH)_x) with an amorphous molybdenum sulfide (MoS_x) heterostructure using rational strategies. This proposed fabrication strategy enables the catalytic activity to be enhanced and fast electron transfer, resulting in an OER in strong alkaline media through synergistic effects and effective modulation of electronic interactions. Moreover, the resulting composite electrode (MoS_x/NiFe(OH)_x/NF) displayed the lowest overpotential and a Tafel slope of 298 mV at 50 mA cm^–2 and 47.25 mV dec^–1, respectively, as well as a good stability under large currents over a prolonged period of 48 h without degradation. The demonstrated electrode is found to dynamically reform the surface layer’s active phase after catalyzing the reactions to serve as an effective electrode for water oxidation. These results have not only led to the development of a robust and effective electrocatalyst but also opened up several possibilities for developing multicomponent electrocatalytic systems in one material that can be integrated into conventional catalyst designs.

更新日期：2024-01-11

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