A novel core–double shell heterostructure derived from a metal–organic framework for efficient HER, OER and ORR electrocatalysis†,Inorganic Chemistry Frontiers

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A novel core–double shell heterostructure derived from a metal–organic framework for efficient HER, OER and ORR electrocatalysis†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2019-10-25 , DOI: 10.1039/c9qi01080g
Jing Li _{1,

2,

3,

4,

5} , Guangshe Li _{1,

2,

3,

4,

5} , Jianghao Wang _{1,

2,

3,

4,

5} , Chenglin Xue _{1,

2,

3,

4,

5} , Xiangshuai Li _{1,

2,

3,

4,

5} , Shuo Wang _{1,

2,

3,

4,

5} , Bingqi Han _{1,

2,

3,

4,

5} , Min Yang _{1,

2,

3,

4,

5} , Liping Li _{1,

2,

3,

4,

5}

Affiliation

The hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are the cornerstone reactions of renewable energy technologies, like electrochemical water splitting and metal–air batteries. To promote these reactions, robust and efficient catalysts are highly desired. However, developing multifunctional electrocatalysts for integrating the HER, OER and ORR into one electrode still remains a huge challenge. Constructing intriguing nanostructures with multiple components and hierarchical interfaces could be an efficient method to develop multifunctional electrocatalysts. Herein, we report a strategy, derived from ZIF-67, to synthesize a novel core–double shell heterostructure Co₉S₈@Co₉S₈@MoS₂-0.5 as a trifunctional pre-catalyst for the HER, OER and ORR. Firstly, a core–shell Co@Co₉S₈ precursor was prepared through sulfurization and pyrolysis of ZIF-67. Then, a hydrothermal method was adopted to grow MoS₂ on the Co@Co₉S₈ precursor. Such a synthetic strategy endows the heterostructure with a strong interface effect that affects the electronic structure of materials and further boosts their electrocatalytic performance. The obtained Co₉S₈@Co₉S₈@MoS₂-0.5 heterostructure shows outstanding electrochemical performance. The overpotentials required for the HER and OER in an alkaline solution are 173 mV and 340 mV at 10 mA cm⁻², respectively. Moreover, Co₉S₈@Co₉S₈@MoS₂-0.5 also exhibits superior ORR performance with a half-wave potential of 0.77 V. The strategy described here can be extended to a number of integrated multifunctional electrocatalysts for water splitting and metal–air batteries.

中文翻译：

一种新型的核-双壳异质结构，其衍生自金属-有机骨架，可实现有效的HER，OER和ORR电催化†

氢气析出反应（HER），氧气析出反应（OER）和氧气还原反应（ORR）是可再生能源技术的基石反应，例如电化学水分解和金属空气电池。为了促进这些反应，非常需要坚固而有效的催化剂。然而，开发将HER，OER和ORR整合到一个电极中的多功能电催化剂仍然是一个巨大的挑战。构建具有多个组件和层次界面的有趣的纳米结构可能是开发多功能电催化剂的有效方法。在这里，我们报道了一种从ZIF-67衍生出的策略，该策略合成了一种新颖的核-双壳异质结构Co ₉ S ₈ @Co ₉ S ₈ @MoS₂ -0.5作为HER，OER和ORR的三官能预催化剂。首先，通过ZIF-67的硫化和热解制备了核壳型Co @ Co₉ S₈前驱体。然后，采用水热法在Co @ Co₉ S₈前驱体上生长MoS₂。这种合成策略使异质结构具有很强的界面效应，这会影响材料的电子结构并进一步提高其电催化性能。所得的Co₉ S₈ @Co₉ S₈ @MoS₂-0.5异质结构显示出出色的电化学性能。在10 mA cm ^-2的碱性溶液中，HER和OER所需的过电势分别为173 mV和340 mV 。此外，Co ₉ S ₈ @Co ₉ S ₈ @MoS ₂ -0.5还具有出色的ORR性能，半波电势为0.77V。这里描述的策略可以扩展到许多用于水分解和金属的集成多功能电催化剂。 –空气电池。

更新日期：2019-12-18

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