Fabrication of strong bifunctional electrocatalytically active hybrid Cu–Cu2O nanoparticles in a carbon matrix†,Catalysis Science & Technology

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Fabrication of strong bifunctional electrocatalytically active hybrid Cu–Cu2O nanoparticles in a carbon matrix†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-01-09 00:00:00 , DOI: 10.1039/c7cy02048a
Pandi Muthukumar _{1,

2,

3,

4,

5} , Vadivel Vinod Kumar _{1,

2,

3,

4,

5} , Gajjala Rajendra Kumar Reddy _{1,

2,

3,

4,

5} , P. Suresh Kumar _{1,

2,

3,

4,

5} , Savarimuthu Philip Anthony _{1,

2,

3,

4,

5}

Affiliation

Herein, earth-abundant cost-effective hybrid copper–cuprous oxide nanoparticles have been fabricated in a carbon matrix (Cu–Cu₂ONPs@C) and used as bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). At a 0.1 mg loading, OER studies of Cu–Cu₂ONPs@C showed a significantly low overpotential of 530 mV @ 10 mA cm⁻² with the applied potential of 2.07 V in 0.4 M KOH. HER studies showed an overpotential of −672 mV @ 10 mA cm⁻² with the applied potential of −1.058 V in 0.4 M H₂SO₄. Cu–Cu₂ONPs@C showed a good electrocatalytic current density of 57.7 mA cm⁻² for OER and −125 mA cm⁻² for HER at a significantly low catalyst loading. For controlled studies, Cu₂ONPs and CuNPs in carbon matrix have also been synthesized, and their catalytic activities (OER and HER) have been compared with those of the hybrid Cu–Cu₂ONPs@C. The comparative studies indicated that the presence of conducting metal CuNPs along with Cu₂ONPs in the carbon matrix enhanced the electrocatalytic activity for both OER and HER as compared to that of pure Cu₂ONPs and CuNPs in the carbon matrix. Interestingly, the solvent used for fabricating different NP electrodes has also shown significant influence on the electrocatalytic current density. The synthesized hybrid Cu–Cu₂ONPs@C, Cu₂ONPs@C, and CuNPs@C were characterized using powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HR-TEM), and BET analysis. To the best of our knowledge, the fabricated hybrid Cu–Cu₂ONP@C exhibited a strong bifunctional electrocatalytic response at a high current density with a low catalyst loading (0.1 mg) among the different Cu-based nanostructured catalysts explored for the water splitting reactions.

中文翻译：

在碳基质中制备强双功能电催化活性杂化Cu–Cu ₂ O纳米粒子†

在此，已在碳基质（Cu-Cu ₂ ONPs @ C）中制备了地球上富于成本效益的杂化铜-亚铜氧化物纳米颗粒，并用作氧气逸出反应（OER）和氢气逸出反应（HER）的双功能电催化剂。。在0.1 mg负载下，Cu–Cu ₂ ONPs @ C的OER研究显示，在10 mA cm ^-2时，530 mV的过低电势非常低，在0.4 M KOH中的施加电势为2.07V。HER研究表明，在10 mA cm ^-2处的过电势为-672 mV ，在0.4 MH ₂ SO _4中的施加电势为-1.058V 。Cu–Cu ₂ ONPs @ C对OER和-125 mA cm均显示出良好的电催化电流密度，为57.7 mA cm ^-2对于HER^-2，催化剂负载量非常低。为了进行对照研究，还合成了碳基质中的Cu₂ ONPs和CuNPs，并将它们的催化活性（OER和HER）与杂化Cu-Cu₂ ONPs @ C进行了比较。比较研究表明，与碳基质中纯Cu₂ ONP和CuNPs相比，碳基质中导电金属CuNPs与Cu₂ ONPs的存在增强了对OER和HER的电催化活性。有趣的是，用于制造不同NP电极的溶剂也已显示出对电催化电流密度的显着影响。合成的杂化Cu–Cu₂ ONPs @ C，Cu₂使用粉末X射线衍射（PXRD），X射线光电子能谱（XPS），高分辨率透射电子显微镜（HR-TEM）和BET分析对ONPs @ C和CuNPs @ C进行了表征。据我们所知，在探索用于水分解的不同铜基纳米结构催化剂中，合成的Cu–Cu ₂ ONP @ C在高电流密度下具有很强的双功能电催化响应，催化剂负载量低（0.1 mg）。反应。

更新日期：2018-01-09

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