Ultrathin porous nanosheet-assembled hollow cobalt nickel oxide microspheres with optimized compositions for efficient oxygen evolution reaction†,Inorganic Chemistry Frontiers

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Ultrathin porous nanosheet-assembled hollow cobalt nickel oxide microspheres with optimized compositions for efficient oxygen evolution reaction†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-06-05 00:00:00 , DOI: 10.1039/c8qi00333e
Jun Zhao _{1,

2,

3,

4} , Xiao-Ru Wang _{1,

2,

3,

4} , Xiao-Jing Wang _{1,

2,

3,

4} , Yu-Pei Li _{1,

2,

3,

4} , Xiao-dong Yang _{1,

2,

3,

4} , Guo-Dong Li _{4,

5,

6,

7,

8} , Fa-Tang Li _{1,

2,

3,

4}

Affiliation

Hollow cobalt nickel oxide microspheres assembled by ultrathin porous nanosheets with tunable Co/Ni molar ratios have been successfully synthesized via a facile “self-template” method, taking solid bimetallic alkoxide microspheres as a precursor. The compositions and the sizes of the hollow cavities of cobalt nickel oxides can be easily controlled by the Co/Ni molar ratios and the size of bimetallic alkoxide microspheres, respectively. The electrochemical measurements indicate that the cobalt nickel oxide catalysts exhibit greatly enhanced oxygen evolution reaction (OER) activity in alkaline media, and Co₂–Ni₁–O microspheres with the optimal composition show the lowest overpotential (∼310 mV for 10 mA cm⁻²) and the smallest Tafel slope (57 mV per decade). This is attributed to the large electrochemically reactive surface and good charge conduction offered by the synergetic effects between their unique structural features and tunable compositions. The hollow cobalt nickel oxide microspheres may serve as promising noble-metal-free OER electrocatalysts to replace IrO_x material, and the synthetic strategy that directs structural design can be applied to prepare other multifunctional materials.

中文翻译：

超薄多孔纳米片组装的中空钴氧化镍钴微球，其成分经过优化，可有效地进行放氧反应†

以固态双金属醇盐微球为前体，通过一种简便的“自模板”方法成功地合成了具有可调Co / Ni摩尔比的超薄多孔纳米片组装而成的空心钴镍氧化物微球。钴镍氧化物的中空腔的组成和大小可以分别通过Co / Ni摩尔比和双金属醇盐微球的大小容易地控制。电化学测量表明，钴镍氧化物催化剂表现出极大地增强析氧反应（OER）的活性在碱性介质中，和Co ₂ -Ni _1个-O微球的最佳组合物显示最低的超电势（~310毫伏10毫安厘米^{- 2个}）和最小的Tafel斜率（每十年57 mV）。这归因于其独特的结构特征和可调组成之间的协同效应，从而提供了较大的电化学反应表面和良好的电荷传导。中空钴氧化镍微球可作为有前景的无贵金属的OER电催化剂来代替IrO _x材料，指导结构设计的合成策略可用于制备其他多功能材料。

更新日期：2018-06-05

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