NiZn double hydroxide nanosheet-anchored nitrogen-doped graphene enriched with the γ-NiOOH phase as an activity modulated water oxidation electrocatalyst,Nanoscale

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NiZn double hydroxide nanosheet-anchored nitrogen-doped graphene enriched with the γ-NiOOH phase as an activity modulated water oxidation electrocatalyst
Nanoscale ( IF 5.8 ) Pub Date : 2017-07-28 00:00:00 , DOI: 10.1039/c7nr02225e
Ayasha Nadeema _{1,

2,

3,

4,

5} , Vishal M. Dhavale _{4,

6,

7} , Sreekumar Kurungot _{1,

2,

3,

4,

5}

Affiliation

Herein, we report a facile solvothermal process to synthesize an active electrocatalyst for the oxygen evolution reaction (OER) in an alkaline medium by anchoring nanosheets of a NiZn double hydroxide over nitrogen doped reduced graphene oxide after enriching the system with the γ-NiOOH phase. This catalyst possesses a thin, porous and open layered structure, which makes the system more efficient and accessible for a better electrochemical water oxidation reaction. Moreover, we experimentally demonstrated that incorporation of Zn via a single-step solvothermal method provides an easy approach to obtain plenty of exposed γ-NiOOH phases to make the system more viable for OER with a small overpotential of 290 mV at 10 mA cm⁻² and a Tafel slope of 44 mV per decade. In addition to this, the oxophilic nature of Zn in the (Zn)Ni-LDH/N-rGO catalyst helps to improve the long-term stability of the whole system. The obtained results open up possibilities for the design of future robust OER electrocatalysts by the use of very cheap and abundant materials like Ni and Zn in place of expensive Ir and Ru in the present commercial electrocatalysts.

中文翻译：

富集γ-NiOOH相的NiZn双氢氧化物纳米片锚固氮掺杂石墨烯作为活性调节水氧化电催化剂

在这里，我们报道了一种容易的溶剂热过程，通过在富集γ-NiOOH相的体系后，通过将NiZn双氢氧化物的纳米片锚定在氮掺杂的还原氧化石墨烯上，在碱性介质中合成用于氧释放反应（OER）的活性电催化剂。该催化剂具有薄的，多孔的和开放的层状结构，这使得该体系更有效且更易于进行更好的电化学水氧化反应。此外，我们通过实验证明，通过单步溶剂热法掺入Zn提供了一种简便的方法来获得大量暴露的γ-NiOOH相，从而使该系统对于OER具有更高的可行性，在10 mA cm ^-2时具有290 mV的小超电势每十年的Tafel斜率为44 mV。除此之外，（Zn）Ni-LDH / N-rGO催化剂中Zn的亲氧性质有助于改善整个系统的长期稳定性。所获得的结果通过使用非常便宜和丰富的材料（例如镍和锌）代替目前的市售电催化剂中的昂贵的铱和钌，为设计未来的耐用OER电催化剂提供了可能性。

更新日期：2017-08-18

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