Graphene Layer Encapsulation of Non-Noble Metal Nanoparticles as Acid-Stable Hydrogen Evolution Catalysts,ACS Energy Letters

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Graphene Layer Encapsulation of Non-Noble Metal Nanoparticles as Acid-Stable Hydrogen Evolution Catalysts
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-06 00:00:00 , DOI: 10.1021/acsenergylett.8b00739
Kailong Hu ₁ , Tatsuhiko Ohto ₂ , Linghan Chen ₃ , Jiuhui Han ₄ , Mitsuru Wakisaka _{5,

6} , Yuki Nagata ₇ , Jun-ichi Fujita ₁ , Yoshikazu Ito _{1,

6}

Affiliation

Acid-stable, non-noble catalysts are promising for hydrogen evolution reaction (HER); however, they get easily damaged when used in acidic electrolytes, thus reducing the HER lifetimes. Moreover, completely blocking catalysts from acidic electrolytes degrades HER performance. To achieve a balance between the HER lifetime and performance, we vary the number of N-doped graphene layers (1–2, 2–3, and 3–5 layers) encapsulating NiMo nanoparticles as efficient HER catalysts and obtain the optimal number of protective layers. Our data show that 3–5 graphene layers achieved the best balance, with a stable current density of 100 mA cm^–2 for 25 h in 0.5 M H₂SO₄. Density functional theory calculations are performed to show the effect of encapsulating graphene layer number on the catalytic activity and protection of non-noble NiMo in acidic electrolytes.

中文翻译：

非贵金属纳米粒子的石墨烯层封装作为酸稳定的析氢催化剂

酸稳定的非贵族催化剂有望用于析氢反应（HER）；但是，在酸性电解液中使用时，它们很容易损坏，从而缩短了HER的寿命。此外，将催化剂与酸性电解质完全隔离会降低HER性能。为了在HER寿命和性能之间取得平衡，我们改变了将NiMo纳米颗粒封装为有效HER催化剂的N掺杂石墨烯层的数量（1-2、2-3和3-5），并获得了最佳的保护层数量。层。我们的数据显示，在0.5 MH ₂ SO _4中25个小时内，3-5层石墨烯层达到了最佳平衡，在100 h cm ^–2的稳定电流密度下。进行密度泛函理论计算，以显示封装石墨烯层数对酸性电解质中非贵金属NiMo的催化活性和保护的影响。

更新日期：2018-06-06

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