Facile synthesis of self-supported amorphous phosphorus-doped Ni(OH)2 composite anodes for efficient water oxidation,Catalysis Science & Technology

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Facile synthesis of self-supported amorphous phosphorus-doped Ni(OH)2 composite anodes for efficient water oxidation
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-11-27 , DOI: 10.1039/c9cy02014d
Gang Yuan _{1,

2,

3,

4,

5} , Yujie Hu _{1,

2,

3,

4,

5} , Zihan Wang _{1,

2,

3,

4,

5} , Qiwei Wang _{1,

2,

3,

4,

5} , Li Wang _{1,

2,

3,

4,

5} , Xiangwen Zhang _{1,

2,

3,

4,

5} , Qingfa Wang _{1,

2,

3,

4,

5}

Affiliation

Water oxidation plays a pivotal role in energy conversion and storage such as in water splitting and metal-air batteries. The development of a highly active and stable electrode for water oxidation at a low price is greatly challenging. Here, we report a self-supported oxygen evolution reaction (OER) electrode with a 3D porous Ni foam (NF) as a core and a dense layer of amorphous phosphorus-doped Ni hydroxide (Ni–OH/P) film as a shell. This facilely fabricated 3D core–shell structured electrode with directly grown active materials offered improved activity and prolonged stability for OER. It required an overpotential of 490 mV to deliver a current density of 100 mA cm⁻²; it showed a small Tafel slope at 87 mV dec⁻¹ and sustained elongated electrolysis at 100 mA cm⁻² for 100 h. The NiOOH shell was in situ formed on the surface of the Ni–OH/P film. Then, a new core–shell structured film was constructed. The synergetic effects of the newly formed crystalline NiOOH shell and amorphous Ni–OH/P core contributed to high stability under harsh conditions. This work presents a facile and easy scale-up path to develop self-supported hybrid electrodes for efficient and stable energy conversion and storage.

中文翻译：

自支撑非晶态掺杂磷的Ni（OH）2复合阳极的简便合成，用于有效的水氧化

水氧化在能量转换和存储中起着关键作用，例如在水分解和金属空气电池中。以低廉的价格开发用于水氧化的高活性和稳定的电极非常具有挑战性。在这里，我们报告了一种以3D多孔镍泡沫（NF）为芯和一层非晶态掺杂磷的氢氧化镍（Ni-OH / P）薄膜的致密层的自支撑氧释放反应（OER）电极。这种易于制造的3D核-壳结构电极，直接生长的活性材料为OER带来了更高的活性和更长的稳定性。它需要490 mV的超电势才能提供100 mA cm ^-2的电流密度。它在87 mV dec ^-1处显示出小的Tafel斜率，并在100 mA cm ^-2处持续伸长的电解持续100小时。NiOOH外壳原位形成在Ni-OH / P膜的表面上。然后，构造了新的核壳结构薄膜。新形成的结晶NiOOH壳和非晶态Ni-OH / P核的协同作用有助于在苛刻条件下实现高稳定性。这项工作为开发自支撑的混合电极提供了一种简便易行的放大途径，以实现高效，稳定的能量转换和存储。

更新日期：2019-11-27

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