Metal Single-Site Molecular Complex–MXene Heteroelectrocatalysts Interspersed Graphene Nanonetwork for Efficient Dual-Task of Water Splitting and Metal–Air Batteries,Advanced Functional Materials

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Metal Single-Site Molecular Complex–MXene Heteroelectrocatalysts Interspersed Graphene Nanonetwork for Efficient Dual-Task of Water Splitting and Metal–Air Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-12-07 , DOI: 10.1002/adfm.202210101
Thanh Hai Nguyen ₁ , Phan Khanh Linh Tran ₁ , Van An Dinh ₂ , Duy Thanh Tran ₁ , Nam Hoon Kim ₁ , Joong Hee Lee _{1,

3}

Affiliation

Development of multifunctional electrocatalysts with high efficiency and stability is of great interest in recent energy conversion technologies. Herein, a novel heteroelectrocatalyst of molecular iron complex (Fe_MC)-carbide MXene (Mo₂TiC₂T_x) uniformly embedded in a 3D graphene-based hierarchical network (GrH) is rationally designed. The coexistence of Fe_MC and MXene with their unique interactions triggers optimum electronic properties, rich multiple active sites, and favorite free adsorption energy for excellent trifunctional catalytic activities. Meanwhile, the highly porous GrH effectively promotes a multichannel architecture for charge transfer and gas/ion diffusion to improve stability. Therefore, the Fe_MC–MXene/GrH results in superb performances towards oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) in alkaline medium. The practical tests indicate that Zn/Al–air batteries derived from Fe_MC–MXene/GrH cathodic electrodes produce high power densities of 165.6 and 172.7 mW cm⁻², respectively. Impressively, the liquid-state Zn–air battery delivers excellent cycling stability of over 1100 h. In addition, the alkaline water electrolyzer induces a low cell voltage of 1.55 V at 10 mA cm⁻² and 1.86 V at 0.4 A cm⁻² in 30 wt.% KOH at 80 °C, surpassing recent reports. The achievements suggest an exciting multifunctional electrocatalyst for electrochemical energy applications.

中文翻译：

金属单中心分子复合物-MXene 异质电催化剂散布石墨烯纳米网络用于水分解和金属-空气电池的高效双重任务

开发高效、稳定的多功能电催化剂是近年来能量转换技术的一大热点。在此，合理设计了一种均匀嵌入基于 3D 石墨烯的分层网络 (GrH) 中的分子铁络合物 (Fe _MC )-碳化物 MXene (Mo ₂ TiC ₂ T _{x ) 的新型杂电催化剂。}_{Fe MC}的共存和 MXene 以其独特的相互作用触发最佳的电子特性、丰富的多个活性位点和最佳的自由吸附能，以实现出色的三功能催化活性。同时，高度多孔的 GrH 有效地促进了电荷转移和气体/离子扩散的多通道结构，以提高稳定性。因此，Fe _MC –MXene/GrH 在碱性介质中对氧还原反应 (ORR)、析氧反应 (OER) 和析氢反应 (HER) 具有出色的性能。实际测试表明，源自 Fe _{MC –MXene/GrH 阴极电极的 Zn/Al-空气电池可产生 165.6 和 172.7 mW cm}^-2的高功率密度，分别。令人印象深刻的是，液态锌空气电池具有超过 1100 小时的出色循环稳定性。此外，碱性水电解槽在 80 °C 的 30 wt.% KOH 中在10 mA cm ^-2时产生 1.55 V 的低电池电压，在 0.4 A cm ^{-2时产生 1.86 V 的低电池电压，超过了最近的报道。}这些成就为电化学能源应用提供了一种令人兴奋的多功能电催化剂。

更新日期：2022-12-07

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