Remarkable enhancement of the alkaline oxygen evolution reaction activity of NiCo2O4 by an amorphous borate shell,Inorganic Chemistry Frontiers

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Remarkable enhancement of the alkaline oxygen evolution reaction activity of NiCo2O4 by an amorphous borate shell
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-07-25 00:00:00 , DOI: 10.1039/c7qi00340d
Xuqiang Ji _{1,

2,

3,

4,

5} , Xiang Ren _{1,

2,

3,

4} , Shuai Hao _{1,

2,

3,

4} , Fengyu Xie _{4,

6,

7,

8} , Fengli Qu _{4,

9,

10,

11} , Gu Du _{4,

12,

13} , Abdullah M. Asiri _{14,

15,

16,

17,

18} , Xuping Sun _{1,

2,

3,

4}

Affiliation

College of Chemistry
Sichuan University
Chengdu 610064
China
College of Chemical and Environmental Engineering
College of Chemistry and Materials Science
Sichuan Normal University
Chengdu 610068
College of Chemistry and Chemical Engineering
Qufu Normal University
Qufu 273165
Chengdu institute of Geology and Mineral Resources
Chengdu 610081
Chemistry Department
Faculty of Science
King Abdulaziz University
Jeddah 21589
Saudi Arabia

It is highly desirable but still a challenging task to find a simple, fast and straightforward method to greatly improve the alkaline oxygen evolution reaction (OER) performance of a NiCo₂O₄ catalyst. In this communication, we demonstrate that developing an amorphous borate shell on a NiCo₂O₄ surface can boost its OER activity in alkaline media. As a 3D catalyst electrode, a NiCo₂O₄@Ni–Co–B nanoarray on carbon cloth needs an overpotential of only 270 mV to achieve a geometrical catalytic current density of 10 mA cm⁻² in 1.0 M KOH, which is 100 mV less than that for a NiCo₂O₄ nanoarray. Notably, this electrode also demonstrates strong electrochemical durability, maintaining its activity for at least 100 h. The superior activity of NiCo₂O₄@Ni–Co–B is attributed to the amorphous Ni–Co–B shell on NiCo₂O₄ favoring the in situ electrochemical generation of more active species during water oxidation.

中文翻译：

非晶态硼酸盐壳显着增强NiCo ₂ O ₄的碱性氧释放反应活性

寻找一种简单，快速而直接的方法来极大地改善NiCo ₂ O ₄催化剂的碱性氧释放反应（OER）性能是非常需要的，但仍然是一项艰巨的任务。在此交流中，我们证明了在NiCo ₂ O ₄表面上开发无定形硼酸盐壳可以增强其在碱性介质中的OER活性。作为3D催化剂电极，碳布上的NiCo ₂ O ₄ @ Ni–Co–B纳米阵列仅需270 mV的超电势即可在1.0 M KOH中达到10 mA cm ^-2的几何催化电流密度，即100 mV小于NiCo ₂ O ₄纳米阵列。值得注意的是，该电极还具有很强的电化学耐久性，可以保持其活性至少100小时。NiCo ₂ O ₄ @ Ni–Co–B的卓越活性归因于NiCo ₂ O ₄上的无定形Ni–Co–B壳层，有利于在水氧化过程中原位电化学生成更多活性物种。

更新日期：2017-09-12

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