【摘要】 本文中,我们设计合成了原位负载于发蓝铁丝上的四氧化三钴（Co₃O₄）自支撑电催化剂,获得了较高的析氧反应活性.在该复合催化剂中,尖晶石结构的Co₃O₄与发蓝层的主要成分四氧化三铁（Fe₃O₄）具有高度的结构相似性与晶格匹配度,有效地保证了表面活性层的紧密生长,降低了催化过程中的电荷转移电阻并促进了电荷的快速传导,获得了高效的析氧反应活性与稳定性.受益于上述结构优势,该电催化剂显示出低至250mV的析氧反应起始过电位和较高的催化电流密度.在外加电压为1.65Vvs.RHE时,析氧反应电流密度高达124mA cm^-2.此外,该催化剂也显示出优越的电化学稳定性,使其有望应用于大规模水裂解制氢电解槽.更多还原

【Abstract】 In this work,Co₃O₄ nanocubes were in situ loaded on the bluing iron wires to form self-supported electrocatalyst and realizing efficient oxygen-evolving activity.The spinel Fe₃O₄ in the bluing layer possesses similar crystal structure with the spinel Co₃O₄,therefore guaranteeing the intimate growth of the catalytically active layer.Besides,the charge transport ability is also boosted by the intimate connection between Co₃O₄ and the substrate,thus leading to highly efficient and stable oxygen-evolving performance.Benefitted from the above structural advances,the composite catalyst shows low OER onset overpotential of 250mV and exhibits high catalytic current density.A high current of 124mA·cm^-2 can be achieved at 1.65Vvs.RHE.Furthermore,excellent electrochemical stability is also achieved,making it a promising candidate for commercial water electrolytic cell.更多还原