Exploration of high-efficiency and inexpensive Pt-free electrochemical catalysts for hydrogen evolution reaction (HER) is highly significative for carbon dioxide free energy conversion systems. In this work, we described the development of CoSe₂ nanoparticles grown on the carbon nanofibers (CNFs) derived from bacterial cellulose (CNFs/CoSe₂) through a facile one-step hydrothermal preparation, which not only showed a three-dimensional (3D) porous network structure, but also possessed large surface area. This rationally designed architecture realizes the uniform distribution of CoSe₂ nanoparticles to provide with fully exposed active edges and the unique conductive interwoven carbon nanofibers facilitates the charge transportation in HER process, thus leading to remarkable HER activity. As expected, the CNFs/CoSe₂ shows a low onset overpotential of −85 mV, low overpotential (η₁₀ = 119 mV) for reaching a current density of −10 mA cm⁻² and smaller Tafel slope of 54 mV dec⁻¹ as well as good cycling stability in acidic electrolyte.

探索用于氢气析出反应（HER）的高效，廉价的无Pt电化学催化剂对无二氧化碳的能量转化系统具有重要意义。在这项工作中，我们描述了通过简便的一步式水热制备法在细菌纤维素（CNFs / CoSe ₂）衍生的碳纳米纤维（CNFs）上生长的CoSe ₂纳米颗粒的开发，该方法不仅显示了三维（3D）多孔网络结构，但也具有较大的表面积。这种合理设计的架构实现了CoSe ₂的均匀分布纳米粒子具有完全暴露的活性边缘和独特的导电交织碳纳米纤维，可促进HER过程中的电荷传输，从而导致卓越的HER活性。正如所料，碳纳米纤维/ COSE ₂示出了发病过电位的-85毫伏低，低超电势（η ₁₀  = 119毫伏）用于达到-10毫安cm 2的电流密度^{- 2}和54毫伏癸较小塔菲尔斜率^-1作为以及在酸性电解液中良好的循环稳定性。