Controlled electrodeposition of iron oxide/nickel oxide@Ni for the investigation of the effects of stoichiometry and particle size on energy storage and water splitting applications†,Journal of Materials Chemistry A

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Controlled electrodeposition of iron oxide/nickel oxide@Ni for the investigation of the effects of stoichiometry and particle size on energy storage and water splitting applications†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-04-30 00:00:00 , DOI: 10.1039/c8ta00795k
Sanjit Saha _{1,

2,

3,

4,

5} , J. Sharath Kumar _{1,

2,

3,

4,

5} , Naresh Chandra Murmu _{1,

2,

3,

4,

5} , Pranab Samanta _{1,

2,

3,

4,

5} , Tapas Kuila _{1,

2,

3,

4}

Affiliation

Controlled synthesis of nickel/iron multimetal oxides with different stoichiometry and particle sizes was carried out by varying the pH of the reaction medium. Electrodeposited samples grown at different pH values showed a wide range of electrochemical properties such as dissimilar current response and potential window due to the formation of different stoichiometry and surface morphologies. Smaller particle size and higher content of NiO are advantageous due to the creation of a facile diffusion path. Moreover, electrical conductivity as well as series resistance increased for the samples with smaller particle size due to the quantum size effect. The quantum size effect was confirmed from the blue shift of the UV-vis absorbance spectrum. The facile diffusion path lowered the charge transfer resistance and accelerated the reaction rate for water splitting. Furthermore, the quantum size effect shifted the flat-band potential and increased the overpotential in the water splitting reaction. Multimetal oxides exhibited a small overpotential of ∼−0.27 V (corresponding to the current response of 10 mA cm⁻²) and a small Tafel slope of ∼63 mV dec⁻¹. Finally, an asymmetric supercapacitor (ASC) cell was fabricated with electrodeposited samples, which showed a large potential window of ∼1.6 V along with a high energy and power density of ∼91 W h kg⁻¹ and 7200 W kg⁻¹, respectively. Furthermore, the ASC exhibited very low relaxation time constant (∼1.3 ms) and long stability of ∼83% after 10 000 CD cycles, ensuring the effectiveness of electrodeposited multimetal oxides for energy storage as well as water splitting applications.

中文翻译：

控制氧化铁/氧化镍@Ni的电沉积，以研究化学计量和粒径对储能和水分解应用的影响†

通过改变反应介质的pH，进行具有不同化学计量和粒径的镍/铁多金属氧化物的受控合成。在不同pH值下生长的电沉积样品由于形成了不同的化学计量比和表面形态，因此显示出广泛的电化学特性，例如不同的电流响应和电势窗口。由于形成了容易的扩散路径，因此较小的粒径和较高的NiO含量是有利的。而且，由于量子尺寸效应，具有较小粒径的样品的电导率以及串联电阻增加。从UV-vis吸收光谱的蓝移证实了量子尺寸效应。容易的扩散路径降低了电荷转移阻力并加快了水分解的反应速度。此外，量子尺寸效应改变了平带电势并增加了水分解反应中的过电势。多金属氧化物表现出约-0.27 V的小过电位（对应于10 mA cm的电流响应^-2）和小的Tafel斜率〜63 mV dec^-1。最后，用电沉积样品制造了一个不对称超级电容器（ASC）电池，该电池显示出约1.6 V的大电势窗口，以及分别约为91 W h kg^-1和7200 W kg^-1的高能量和功率密度。此外，ASC在10万次CD循环后表现出非常低的弛豫时间常数（约1.3毫秒）和长期稳定性，约83％，确保了电沉积多金属氧化物在储能和水分解应用中的有效性。

更新日期：2018-04-30

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