<br>硼酸盐阴离子插层 NiV-LDH 纳米片/NiCoP 纳米线异质结构可增强海水分解中的析氧选择性,Advanced Functional Materials

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硼酸盐阴离子插层 NiV-LDH 纳米片/NiCoP 纳米线异质结构可增强海水分解中的析氧选择性
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-01-07 , DOI: 10.1002/adfm.202315949
Tian‐Qi Gao ₁ , Yu‐Qing Zhou ₁ , Xiao‐Jun Zhao ₂ , Zhi‐Hong Liu ₁ , Yu Chen ₃

Affiliation

资源丰富且廉价的海水直接裂解省略了海水淡化过程，有效提高了氢能发电效率。然而，海水分解的发展受到阳极析氧反应（OER）和析氯反应的选择性挑战以及电极腐蚀问题的阻碍。在此，合成了负载在泡沫镍上的硼酸根阴离子插层的 NiV-LDH 纳米片/NiCoP 纳米线异质结构（2D/1D NiV-BLDH/NiCoP/NF）。理论计算表明，Ni(OH) ₂ 中少量V原子掺杂有利于通过桥接Ni─O改变Ni原子周围的电子环境，从而构建Ni─O─V来加速电子转移并促进催化活性。硼酸根阴离子(B(OH) ₄ ⁻ ）的插入不仅具有良好的亲水性和较高的OH ⁻ 选择性，而且削弱了氯的吸附（ Cl ⁻ )，有效抑制析氯反应。因此，组件优化的NiV _0.1 -BLDH/NiCoP/NF电催化剂仅需要268 mV过电势即可在碱性环境中达到100 mA cm ⁻² OER。特别是，NiCoP/NF||NiV _0.1 -BLDH/NiCoP/NF 电池在 10 mA cm ⁻² 电流下表现出有吸引力的整体水分解性能，电压为 1.46 和 1.53 V分别为碱性淡水和碱性海水。这种电催化剂的设计策略为海水分解提供了一条新途径。

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Borate Anion-Intercalated NiV-LDH Nanoflakes/NiCoP Nanowires Heterostructures for Enhanced Oxygen Evolution Selectivity in Seawater Splitting

Resourceful and inexpensive seawater direct splitting omits the desalination process and effectively increases the efficiency of hydrogen energy generation. However, the development of seawater splitting is hampered by the competing selectivity challenges from anodic oxygen evolution reaction (OER) and chlorine evolution reaction and the issues of electrode corrosion. Herein, the borate anion-intercalated NiV-LDH nanoflakes/NiCoP nanowires heterostructures supported on Ni foam (2D/1D NiV-BLDH/NiCoP/NF) is synthesized. Theoretical calculations show that a small amount of V atom doping in Ni(OH)₂ is favorable for changing the electronic environment around Ni atoms via bridging Ni─O, which can construct Ni─O─V to accelerate electron transfer and promote catalytic activity. The borate anions (B(OH)₄⁻) intercalation not only results in the good hydrophilicity and high OH⁻ selectivity but also weakens the adsorption of chlorine (Cl⁻), which effectively restrains the chlorine evolution reaction. Thus, the component optimized NiV_0.1-BLDH/NiCoP/NF electrocatalyst only requires 268 mV overpotential to reach 100 mA cm⁻² for OER in an alkaline environment. Particularly, the NiCoP/NF||NiV_0.1-BLDH/NiCoP/NF cell exhibits attractive overall water splitting performance with a low voltage of 1.46 and 1.53 V at 10 mA cm⁻² in alkaline freshwater and alkaline seawater, respectively. The design strategy of this electrocatalyst provides a new avenue for seawater splitting.

更新日期：2024-01-07

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