Bifunctional electro-catalytic performances of NiMoO <ce:inf loc='post'>4</ce:inf>-NRs@RGO nanocomposites for oxygen evolution and oxygen reduction reactions

Jahangeer Ahmed; Manawwer Alam; M.A. Majeed Khan; Saad M. Alshehri

摘要

In present study, we report hydrothermal synthesis of reduced graphene oxide (RGO) supported NiMoO4-nanorods (NRs) nanocomposites (NiMoO4-NRs@RGO nanocomposites) for electro-catalysis of water to oxygen evolution and reduction reactions (OER/ORR). The prepared nanocomposites were characterized by x-ray diffraction (XRD), Raman, Fourier transform infrared (FTIR), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), energy dispersive and x-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performances of NiMoO4-NRs@RGO nanocomposites were examined in 0.5?M KOH (alkaline electrolyte) using cyclic voltammetry (CV), linear sweep voltammetry (LSV), Tafel and chronoamperometry (CA) electrochemical techniques at room temperature. The onset over-potentials of NiMoO4-NRs@RGO nanocomposite for ORR and OER were found to be of ~75 and ~185?mV, respectively, while the Tafel slopes for OER and ORR were observed to be ~54 and ~245?mV/dec respectively. The involved electrons (i.e. 4e?) in redox reactions were calculated using rotating disc electrode experiments. Based on admirable electro-catalytic performance of NiMoO4-NRs@RGO nanocomposites with low energy loss, suggesting it as cost effective and efficient OER/ORR electro-catalysts compared to noble metal electro-catalysts.

机译：在目前的研究中，我们报告了氧化石墨烯（RGO）的水热合成支持的NIMOO4-纳米（NRS）纳米复合材料（NIMOO4-NRS @ RGO纳米复合材料），用于电催化水与氧气进化和还原反应（OER / ORR）。通过X射线衍射（XRD），拉曼，傅立叶变换红外（FTIR），高分辨率透射电子显微镜（HRTEM），场发射扫描电子显微镜（FESEM），能量分散和X射线光电子谱（ XPS）技术。使用环状伏安法（CV），线性扫描伏安法（LSV），Tafear扫描伏安法（LSV），Tafear和Chronoamperryry（CA）电化学技术在0.5·m koh（碱性电解质）中检查NiMoo4-nrs @ rgo纳米复合材料的电化学性能。发现NIMOO4-NRS @ rgo纳米复合材料的发病电位分别为〜75和〜185？MV，而OER和ORR的TAFEL斜率被观察到为〜54〜245？MV / 12月。使用旋转盘电极实验计算氧化还原反应中所涉及的电子（即4E？）。基于低能量损失的NIMOO4-NRS @ rgo纳米复合材料的令人钦佩的电催化性能，表明与贵金属电催化剂相比，其与贵金属电催化剂相比具有成本效益和高效的OER / ORR电催化剂。

Bifunctional electro-catalytic performances of NiMoO 4-NRs@RGO nanocomposites for oxygen evolution and oxygen reduction reactions

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