<br>沸石咪唑酯骨架衍生的Co3S4@NiFe-LDH核壳异质结构作为高效双功能水分解电催化剂,ACS Applied Materials & Interfaces

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沸石咪唑酯骨架衍生的Co3S4@NiFe-LDH核壳异质结构作为高效双功能水分解电催化剂
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-02-06 , DOI: 10.1021/acsami.3c16683
Linli Chen ₁ , Hao Chen ₁ , Lei Wu ₁ , Guochang Li ₁ , Kai Tao ₁ , Lei Han ₁

Affiliation

开发稳定高效的双功能电催化剂对于整体水分解至关重要。本研究介绍了通过在沸石咪唑骨架衍生的Co ₃ S ₄纳米片阵列上电沉积超薄NiFe-LDH纳米片制备的Co ₃ S ₄ @NiFe-LDH核壳异质结构。双功能 Co ₃ S ₄ @NiFe-LDH/NF 对 OER 和 HER 均表现出令人印象深刻的催化性能和长期稳定性，在 1 中具有 235 mV 时 100 mA cm ^–2和 95 mV 时 10 mA cm ^–2的低过电位分别为M KOH。以Co ₃ S ₄ @NiFe-LDH/NF作为阴极和阳极的组装电池在10和20 mA cm ^–2的电流密度下分别表现出1.595和1.666 V的电压，以及超过500小时的超长稳定性。 DFT 计算揭示了 Co ₃ S ₄ @NiFe-LDH/NF 核壳结构异质界面处强大的电子相互作用。这种相互作用促进电子从NiFe-LDH转移到Co ₃ S ₄并降低OER中间体的能垒，从而增强电催化活性。这项研究通过构建异质结界面为电化学水分解的有前途的材料提供了新的见解。

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Zeolitic Imidazolate Framework-Derived Co3S4@NiFe-LDH Core–Shell Heterostructure as Efficient Bifunctional Electrocatalyst for Water Splitting

The development of stable and efficient bifunctional electrocatalysts is of utmost importance for overall water splitting. This study introduces Co₃S₄@NiFe-LDH core–shell heterostructure prepared via an electrodeposition of ultrathin NiFe-LDH nanosheet on zeolitic imidazolium framework-derived Co₃S₄ nanosheet arrays. The bifunctional Co₃S₄@NiFe-LDH/NF exhibits impressive catalytic performance and long-term stability for both the OER and HER with low overpotentials of 100 mA cm^–2 at 235 mV and 10 mA cm^–2 at 95 mV in 1 M KOH, respectively. The assembled cell with Co₃S₄@NiFe-LDH/NF as both cathode and anode shows voltages of 1.595 and 1.666 V at current densities of 10 and 20 mA cm^–2, respectively, as well as ultralong stability over 500 h. DFT calculations expose a robust electron interaction at the heterogeneous interface of the Co₃S₄@NiFe-LDH/NF core–shell structure. This interaction promotes electron transfer from NiFe-LDH to Co₃S₄ and reduces the energy barriers for OER intermediates, thereby enhancing electrocatalytic activity. This research contributes novel insights toward the promising materials for electrochemical water splitting through the construction of heterojunction interfaces.

更新日期：2024-02-06

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