Ni nanotube array-based electrodes by electrochemical alloying and de-alloying for efficient water splitting†,Nanoscale

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Ni nanotube array-based electrodes by electrochemical alloying and de-alloying for efficient water splitting†
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-17 00:00:00 , DOI: 10.1039/c8nr02238k
Xue Teng _{1,

2,

3,

4,

5} , Jianying Wang _{1,

2,

3,

4,

5} , Lvlv Ji _{1,

2,

3,

4,

5} , Yaokang Lv _{5,

6,

7,

8} , Zuofeng Chen _{1,

2,

3,

4,

5}

Affiliation

The design of cost-efficient earth-abundant catalysts with superior performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is extremely important for future renewable energy production. Herein, we report a facile strategy for constructing Ni nanotube arrays (NTAs) on a Ni foam (NF) substrate through cathodic deposition of NiCu alloy followed by anodic stripping of metallic Cu. Based on Ni NTAs, the as-prepared NiSe₂ NTA electrode by NiSe₂ electrodeposition and the NiFeO_x NTA electrode by dipping in Fe³⁺ solution exhibit excellent HER and OER performance in alkaline conditions. In these systems, Ni NTAs act as a binder-free multifunctional inner layer to support the electrocatalysts, offer a large specific surface area and serve as a fast electron transport pathway. Moreover, an alkaline electrolyzer has been constructed using NiFeO_x NTAs as the anode and NiSe₂ NTAs as the cathode, which only demands a cell voltage of 1.78 V to deliver a water-splitting current density of 500 mA cm⁻², and demonstrates remarkable stability during long-term electrolysis. This work provides an attractive method for the design and fabrication of nanotube array-based catalyst electrodes for highly efficient water-splitting.

中文翻译：

基于镍纳米管阵列的电极通过电化学合金化和去合金化实现有效的水分解†

具有成本效益的高效富地球催化剂的设计对于氢气释放反应（HER）和氧气释放反应（OER）具有卓越的性能，对于未来的可再生能源生产极为重要。在本文中，我们报告了一种通过NiCu合金的阴极沉积，然后对金属Cu进行阳极剥离，在Ni泡沫（NF）基板上构造Ni纳米管阵列（NTA）的简便策略。基于Ni NTAs，通过NiSe ₂电沉积制备的NiSe ₂ NTA电极和浸入Fe ³⁺的NiFeO _x NTA电极该溶液在碱性条件下表现出出色的HER和OER性能。在这些系统中，Ni NTA充当无粘合剂的多功能内层，以支撑电催化剂，提供大的比表面积并充当快速的电子传输途径。此外，已经使用NiFeO _x NTA作为阳极并且NiSe ₂ NTAs作为阴极构造了碱性电解槽，该电解槽仅需要1.78 V的电池电压即可提供500 mA cm ^-2的水分解电流密度，并且表现出显着的性能。长期电解过程中的稳定性。这项工作为设计和制造用于高效水分解的基于纳米管阵列的催化剂电极提供了一种有吸引力的方法。

更新日期：2018-04-17

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