A wafer-scale 1 nm Ni(OH)2 nanosheet with superior electrocatalytic activity for the oxygen evolution reaction†,Nanoscale

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A wafer-scale 1 nm Ni(OH)2 nanosheet with superior electrocatalytic activity for the oxygen evolution reaction†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1039/c7nr09042k
Peng Tian _{1,

2,

3,

4,

5} , Yanhao Yu _{1,

2,

3,

4} , Xin Yin _{1,

2,

3,

4} , Xudong Wang _{1,

2,

3,

4}

Affiliation

A wafer-scale 1.4 nm ultrathin Ni(OH)₂ nanosheet was synthesized by ionic layer epitaxy. This free-standing Ni(OH)₂ nanosheet was directly used to catalyze the oxygen evolution reaction (OER). At a current density of 10 mA cm⁻², the overpotential reached 295 mV (vs. RHE) in Fe-rich 1 M NaOH. This 1.4 nm Ni(OH)₂ nanosheet showed a very high turnover frequency of 5.47 s⁻¹ and a mass activity of more than 2 × 10⁴ A g⁻¹ at an overpotential of 300 mV. Such a high electrocatalytic mass activity of the Ni(OH)₂ nanosheet was more than 2 orders of magnitude higher than those of typical OER catalysts. The capability of producing wafer-scale nanometer-thick nanosheets offers a promising strategy to improve the mass efficiency of electrochemical catalysts, which is particularly valuable for preserving rare and precious catalyst materials.

中文翻译：

晶圆级1 nm Ni（OH）₂纳米片，具有优异的电催化活性，可用于氧气释放反应†

通过离子层外延合成了晶圆级的1.4 nm超薄Ni（OH）₂纳米片。这种独立的Ni（OH）₂纳米片直接用于催化氧释放反应（OER）。在10 mA cm ^-2的电流密度下，在富铁的1 M NaOH中，超电势达到295 mV（相对于RHE）。该1.4 nm Ni（OH）₂纳米片在300 mV的超电势下显示出5.47 s ^-1的非常高的转换频率和超过2×10 ⁴ A g ^-1的质量活度。Ni（OH）_2的如此高的电催化质量活性纳米片比典型的OER催化剂高出2个数量级。生产晶圆级纳米厚度纳米片的能力提供了一种有前途的策略来提高电化学催化剂的质量效率，这对于保存稀有和珍贵的催化剂材料特别有价值。

更新日期：2018-02-12

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