Laser-Induced Graphitic Carbon with Ultrasmall Nickel Nanoparticles for Efficient Overall Water Splitting,Particle & Particle Systems Characterization

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Laser-Induced Graphitic Carbon with Ultrasmall Nickel Nanoparticles for Efficient Overall Water Splitting
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2021-07-18 , DOI: 10.1002/ppsc.202100119
Do Van Lam ₁ , Van‐Toan Nguyen ₂ , Euijin Roh ₃ , Quang‐Tung Ngo ₂ , Wanuk Choi ₃ , Jae‐Hyun Kim _{1,

4} , Hyunuk Kim _{3,

4} , Ho‐Suk Choi ₂ , Seung‐Mo Lee _{1,

4}

Affiliation

Metal nanoparticles encapsulated in graphitic carbon can show high catalytic efficiency and stability, yet the production method remains improved. Herein, it is demonstrated that a Ni-based metal–organic framework [EG-MOF-74(Ni)] can be rapidly transformed into ultrasmall Ni-nanoparticles with different sizes (4–11 nm) encapsulated in graphitic carbon via the laser-scribing method. The synthesized sample shows the best electrocatalytic performances with excellent stability in alkaline electrolyte for oxygen/hydrogen evolution reactions with overpotentials of 0.35/0.18 V at a current density of 10 mA cm⁻² when the Ni particle size is ≈6 nm. This is because of its well-developed micro/mesoporous structure, high electronic transport, and large electrochemical active surface area. An electrolyzer with Ni-nanoparticles encapsulated in the graphitic carbon shows a current density of 10 mA cm⁻² at a voltage of 1.6 V, which is comparable to the Pt/C and RuO₂ counterparts. The laser-based synthesis can serve as a powerful tool for the size-controlled synthesis of various catalysts out of MOFs.

中文翻译：

具有超小镍纳米颗粒的激光诱导石墨碳可实现高效的整体水分解

包裹在石墨碳中的金属纳米粒子具有较高的催化效率和稳定性，但生产方法仍有待改进。在此，证明了镍基金属-有机骨架 [EG-MOF-74(Ni)] 可以通过激光快速转化为封装在石墨碳中的不同尺寸（4-11 nm）的超小镍纳米颗粒。划线法。合成的样品显示出最佳的电催化性能，在碱性电解质中对氧/氢析出反应具有优异的稳定性，在电流密度为 10 mA cm ^{-2 时的}过电位为 0.35/0.18 V当 Ni 粒径 ≈6 nm 时。这是因为它具有发达的微/介孔结构、高电子传输和大的电化学活性表面积。具有封装在石墨碳中的 Ni 纳米颗粒的电解槽在 1.6 V 的电压下显示出 10 mA cm ^-2的电流密度，这与 Pt/C 和 RuO ₂对应物相当。基于激光的合成可以作为从 MOF 中尺寸控制合成各种催化剂的有力工具。

更新日期：2021-09-16

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