Unique Size of Co Nanoparticles Encapsulated in N-Rich Carbon Structure Derived from Electrochemical Etching for Enhanced Electrocatalytic Hydrogen Evolution,ACS Applied Energy Materials

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Unique Size of Co Nanoparticles Encapsulated in N-Rich Carbon Structure Derived from Electrochemical Etching for Enhanced Electrocatalytic Hydrogen Evolution
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-12-31 00:00:00 , DOI: 10.1021/acsaem.9b01877
Yingying Du _{1,

2} , Hui Chen ₁ , Zhaohui Huang ₁ , Xuan He ₁ , Wei Fang ₁ , Weixin Li ₁ , Lei Zhao _{1,

2}

Affiliation

Co nanoparticles with uniform size distribution are promising electrocatalysts for hydrogen evolution reaction. Herein, we synthesize Co nanoparticles encapsulated in in situ formed N-doped carbon and carbon nanotubes (CNTs) named as Co–N/C(CNTs) by low-temperature carbonization the organic–inorganic hybrid precursors. The as-prepared 4.55% Co–N/C(CNTs) shows the better hydrogen evolution reaction (HER) performance. As demonstrated in electrochemical measurements, 4.55% Co–N/C(CNTs) composite can achieve 10 mA cm^–2 at the overpotential of 263 mV in 0.5 M H₂SO₄ at the first LSV curve. After electrochemical etching, which is carried out through the cyclic voltammetry (CV) cycle with different laps, a uniform Co nanoparticle with a diameter of around 7 nm encapsulated in N-doped carbon is obtained. The overpotential is 168 mV after 4000 times CV cycles and stabilizes at 180 mV after 6000 times cycles. Therefore, this work may provide an idea for the design of high activity HER electrocatalysts in acid solution.

中文翻译：

电化学刻蚀衍生的N碳结构中包裹的Co纳米颗粒的独特尺寸，可增强电催化氢的释放

具有均匀尺寸分布的Co纳米颗粒是用于氢释放反应的有前途的电催化剂。在这里，我们通过低温碳化有机-无机杂化前体来合成包裹在原位形成的N掺杂碳和碳纳米管（CNT）中的Co纳米颗粒。所制备的4.55％Co-N / C（CNT）显示出更好的析氢反应（HER）性能。如电化学测量所示，在0.5 MH ₂ SO _4中，在263 mV的超电势下，4.55％Co-N / C（CNTs）复合材料可以达到10 mA cm ^–2在第一条LSV曲线上。通过循环伏安（CV）循环以不同的圈数进行电化学蚀刻后，获得了直径约7 nm的均匀Co纳米颗粒，被包裹在N掺杂的碳中。在4000次CV循环后，过电势为168 mV，在6000次循环后，稳定在180 mV。因此，这项工作可为在酸性溶液中设计高活性HER电催化剂提供一个思路。

更新日期：2019-12-31

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