Coupling Ag-doping and rich oxygen vacancies in mesoporous NiCoO nanorods supported on nickel foam for highly efficient oxygen evolution,Inorganic Chemistry Frontiers

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Coupling Ag-doping and rich oxygen vacancies in mesoporous NiCoO nanorods supported on nickel foam for highly efficient oxygen evolution
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-08-28 00:00:00 , DOI: 10.1039/c7qi00407a
Kai-Li Yan _{1,

2,

3,

4} , Jing-Qi Chi _{1,

2,

3,

4} , Zi-Zhang Liu _{1,

2,

3,

4,

5} , Bin Dong _{1,

2,

3,

4,

5} , Shan-Shan Lu _{1,

2,

3,

4,

5} , Xiao Shang _{1,

2,

3,

4} , Wen-Kun Gao _{1,

2,

3,

4,

5} , Yong-Ming Chai _{1,

2,

3,

4} , Chen-Guang Liu _{1,

2,

3,

4}

Affiliation

A crucial challenge still remains in the development of efficient and stable electrocatalysts for oxygen evolution reaction (OER) with desirable conductivity, a high surface area and rich oxygen vacancies. Herein, a type of Ag-doped mesoporous NiCoO nanorod with rich oxygen vacancies (NiCoO@Ag40/NF-Ar) for OER is prepared via an electrodeposition-hydrothermal reaction and the subsequent annealing treatment process under an Ar atmosphere. The electrodeposited Ag film is found to direct the uniform growth of the nanowire arrays of NiCo hydroxide precursors compared to the nanoparticles of NiCo hydroxide in the absence of the Ag film. Interestingly, the addition of C₂H₈N₂ (EN) during the electrodeposition of the Ag film and the subsequent calcination under an Ar atmosphere collectively contribute to the formation of mesoporous nanorod structures and rich oxygen vacancies. The calcined NiCoO in air mainly have the Co₃O₄ phase, implying that it has fewer oxygen vacancies and weak activity for OER. The high surface area and one-dimensional feature of mesoporous nanorods are responsible for the increased exposure of active sites and fast charge transport behavior. Moreover, Ag doping can also improve the conductivity of NiCoO nanorods. NiCoO@Ag40/NF-Ar exhibits a highly efficient activity for OER with a current density of 140 mA cm⁻² at an overpotential of 370 mV and a remarkable stability. The suitable Ar annealing treatment coupling Ag films and oxygen vacancies into transition metal oxide precursors may be a facile and promising method for constructing mesoporous nanostructures with rich oxygen vacancies for efficient water oxidation.

中文翻译：

泡沫镍上负载的介孔NiCoO纳米棒中的Ag掺杂和富氧空位耦合，以高效释放氧气

对于具有理想的电导率，高表面积和富氧空位的氧释放反应（OER）的高效，稳定的电催化剂的开发，仍然存在着严峻的挑战。在此，通过电沉积-水热反应和随后在Ar气氛下的退火处理工艺，制备了一种用于OER的富氧空位的Ag掺杂介孔NiCoO纳米棒（NiCoO @ Ag40 / NF-Ar）。与不存在Ag膜的情况下的NiCo氢氧化物的纳米颗粒相比，发现电沉积的Ag膜可以指导NiCo氢氧化物前体的纳米线阵列的均匀生长。有趣的是，添加了C ₂ H ₈ N ₂（EN）在电沉积Ag膜和随后在Ar气氛下煅烧的过程中，共同有助于形成中孔纳米棒结构和富氧空位。空气中煅烧的NiCoO主要为Co ₃ O ₄相，这表明它的氧空位较少，对OER的活性较弱。介孔纳米棒的高表面积和一维特征是导致活性位点暴露增加和快速电荷传输行为的原因。此外，Ag掺杂还可以提高NiCoO纳米棒的电导率。NiCoO @ Ag40 / NF-Ar对OER表现出高效的活性，电流密度为140 mA cm ^-2在370 mV的超电势下具有出色的稳定性。将Ag薄膜和氧空位耦合到过渡金属氧化物前体中的合适的Ar退火处理可能是一种简便而有前途的方法，该方法可构建具有富氧空位的中孔纳米结构，以有效地进行水氧化。

更新日期：2017-09-18

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