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首页> 外文期刊>Journal of materials science >CoSe_2 nanosheets decorated on carbon fibers as efficient and stable catalysts for hydrogen evolution reaction
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CoSe_2 nanosheets decorated on carbon fibers as efficient and stable catalysts for hydrogen evolution reaction

机译：碳纤维上装饰的CoSe_2纳米片作为氢释放反应的有效和稳定催化剂

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In this study, a novel structure of two-dimensional cobalt selenide (CoSe~(2)) nanosheets integrating on three-dimensional carbon fibers (CF) have been successfully synthesized by using a facile method. The CoSe~(2)has been characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) patterns. The SEM images of the CoSe~(2)exhibit sheet-like morphologies densely and uniformly grew on the entire surface of the CF and the XRD result reveals the as-prepared CoSe~(2)are pure and crystalline characteristics of orthorhombic phase. Such morphological features may not only provide large surface area for exposing more active sites, but also benefit deep electrolyte penetration for electrons and electrolyte ions. Electrochemical experiments demonstrate the as-prepared CoSe~(2)nanosheets-CF possesses 10 mA/cm_(2)at HER overpotential of 0.118 V, as well as a Tafel slope of 53.2 mV/dec (in 0.5 M H~(2)SO~(4)). Photoelectrochemical measurements indicate that the current density of CoSe~(2)nanosheets significantly increased under light irradiation. The present work provides an attractive non-noble-metal electrocatalyst for highly efficient production of H~(2)toward water splitting.
机译：在这项研究中，已经成功地使用一种简便的方法成功地合成了一种新型的二维硒化钴（CoSe〜（2））纳米片集成在三维碳纤维（CF）上的结构。通过扫描电子显微镜（SEM）和X射线衍射（XRD）图对CoSe〜（2）进行了表征。 CoSe〜（2）呈片状形态的SEM图像在CF的整个表面上致密均匀地生长，X射线衍射结果表明所制备的CoSe〜（2）具有正交晶相的纯净和结晶特性。这样的形态特征不仅可以提供大的表面积以暴露更多的活性位点，而且可以有益于电子和电解质离子的深层电解质渗透。电化学实验表明，所制备的CoSe〜（2）纳米片-CF在HER超电势为0.118V时具有10mA / cm_（2），并且Tafel斜率为53.2mV / dec（在0.5MH〜（2）SO中） 〜（4））。光电化学测量表明，CoSe〜（2）纳米片的电流密度在光照射下显着增加。本工作提供了一种引人注目的非贵金属电催化剂，可以高效地将H〜（2）分解为水。

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