Tailoring the electronic structure by constructing the heterointerface of RuO2–NiO for overall water splitting with ultralow overpotential and extra-long lifetime,Journal of Materials Chemistry A

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Tailoring the electronic structure by constructing the heterointerface of RuO2–NiO for overall water splitting with ultralow overpotential and extra-long lifetime
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-19 , DOI: 10.1039/d0ta06565j
Gengwei Zhang _{1,

2,

3,

4,

5} , Bin Wang _{1,

2,

3,

4,

5} , Lu Li _{1,

2,

3,

4,

5} , Sen Yang _{1,

2,

3,

4,

5} , Jiamei Liu _{5,

6,

7,

8} , Shengchun Yang _{1,

2,

3,

4,

5}

Affiliation

The rational design of highly efficient and stable electrocatalysts remains a challenge for large scale hydrogen production. Regulating the heterointerface between two catalyst components could effectively modulate the electronic structure and tune the electrocatalytic activity. Herein, a hybrid RuO₂–NiO electrocatalyst on nickel foam was prepared via a simple and easy industrial scale-up approach, which affords a current density of 10 mA cm⁻² at low overpotentials of 18 mV for HER and 187 mV for OER, respectively. The electrolyzer assembled by the RuO₂–NiO bifunctional electrode needs a cell voltage of only 1.43 V to reach 10 mA cm⁻² for the overall water splitting. Moreover, the electrolyzer achieved an outstanding activity and stability at high current densities, which needed a cell voltage of only 1.66 V to reach 500 mA cm⁻², and could perform continuous electrolysis for 2000 hours at 1000 mA cm⁻², thereby demonstrating a great potential for practical applications. Theoretical calculations revealed that the coupling of RuO₂ and NiO could greatly accelerate water dissociation and modulate the chemisorption of hydrogen and oxygen-containing intermediates on the catalyst, and consequently enhance the intrinsic activity towards both HER and OER.

中文翻译：

通过构建RuO2-NiO的异质界面来定制电子结构，以实现超低超电势和超长寿命的整体水分解

高效，稳定的电催化剂的合理设计仍然是大规模制氢的挑战。调节两个催化剂组分之间的异质界面可以有效地调节电子结构并调节电催化活性。在此，通过简单易行的工业放大方法制备了在泡沫镍上的RuO ₂ -NiO杂化电催化剂，在低过电势下，HER为18 mV，OER为187 mV，电流密度为10 mA cm ^-2，分别。由RuO ₂ -NiO双功能电极组装的电解槽仅需要1.43 V的电池电压即可达到10 mA cm ^-2用于整体水分解。此外，该电解槽在高电流密度下具有出色的活性和稳定性，仅需1.66 V的电池电压即可达到500 mA cm ^-2，并且可以在1000 mA cm ^{-2的条件下}连续电解2000小时，从而证明了具有巨大的实际应用潜力。理论计算表明，RuO ₂和NiO的偶联可以大大促进水的离解，并调节氢和含氧中间体在催化剂上的化学吸附，从而增强对HER和OER的内在活性。

更新日期：2020-09-22

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