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首页> 外文期刊>Electrocatalysis >Preparation and Evaluation of Nickel Nanoparticles Supported on the Polyvinylpyrrolidone-Graphene Composite as a Durable Electrocatalyst for HER in Alkaline Media
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Preparation and Evaluation of Nickel Nanoparticles Supported on the Polyvinylpyrrolidone-Graphene Composite as a Durable Electrocatalyst for HER in Alkaline Media

机译：碱性介质中聚乙烯吡咯烷酮-石墨烯复合材料作为HER的耐用电催化剂负载的镍纳米粒子的制备和评价

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Low-cast non-noble-based catalysts with high activity and durability are the choices to replace expensive Pt-based catalysts for hydrogen evolution reaction (HER). In this work, polyvinylpyrrolidone (PVP)-modified graphene (PVP-rGO) was synthesized as a composite with a high surface area and additional functional groups for Ni nanoparticle support. Loading of nickel nanoparticles on the PVP-rGO was optimized to obtain an effective non-noble catalyst (Ni/PVP-rGO) for HER in alkaline media. Inductively coupled plasma optical emission spectrometry (ICP-OES) results demonstrated a relatively good accordance between theoretical and experimental metal loading by this facile synthesis procedure. The structure and morphology of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR) techniques. The activity and stability of the prepared catalysts (with and without PVP) were investigated at HER in alkaline media by different electrochemical techniques. A Tafel slope of 119 mV dec(-1) was obtained for Ni/PVP-rGO, which was consistent with the Volmer reaction as the rate determining step (RDS) of HER mechanism. Also, an acceptable durability in HER performance was obtained by Ni/PVP-rGO (working over 62.5 h and 5000 cycles without a notable lost). These results make it as a promising catalyst which could be employed in the cathode side of water electrolyzer in alkaline media.
机译：具有高活性和耐用性的低浇铸非贵族催化剂是替代昂贵的基于Pt的催化剂用于放氢反应（HER）的选择。在这项工作中，聚乙烯吡咯烷酮（PVP）改性的石墨烯（PVP-rGO）被合成为具有高表面积和附加功能基团的复合材料，用于Ni纳米颗粒载体。优化了PVP-rGO上镍纳米粒子的负载量，以获得在碱性介质中用于HER的有效非贵金属催化剂（Ni / PVP-rGO）。电感耦合等离子体发射光谱法（ICP-OES）的结果表明，通过这种简便的合成程序，在理论和实验金属负载量之间具有相对较好的一致性。通过X射线衍射（XRD），扫描电子显微镜（SEM）和傅里叶变换红外光谱（FT-IR）技术研究了样品的结构和形态。通过不同的电化学技术，在碱性介质中于HER上研究了制备的催化剂（有和没有PVP）的活性和稳定性。 Ni / PVP-rGO的Tafel斜率为119 mV dec（-1），这与作为HER机制的速率确定步骤（RDS）的Volmer反应一致。而且，通过Ni / PVP-rGO获得了可接受的HER性能耐久性（在62.5 h和5000个循环中工作，没有明显损失）。这些结果使其成为有希望的催化剂，可用于碱性介质中水电解槽的阴极侧。

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