Developing a cost-effective, efficient, and facile prepared electrocatalyst for oxygen reduction (ORR) and evolution reaction (OER) is critical for a range of renewable energy technologies. Herein, we report unique Co₄N nanoparticles loading on g-C₃N₄ nanotubes (Co₄N@CNNT) bifunctional electrocatalyst for OER and ORR by an in-situ method. Highly dispersed Co₄N nanoparticles as the active sites gather at the top of the g-C₃N₄ nanotube (CNNT), while the six-fold cavities from smooth CNNT with an outer diameter of 48 nm and an inner diameter of 22 nm act as anchor sites to preferentially coordinate with the active sites. Benefiting from the distinctive structure features, the intrinsic metallic Co₄N@CNNT exhibits high electrocatalytic performances. Electrochemistry studies show that an onset potential of 0.94 V and a half-wave potential of 0.86 V of Co₄N@CNNT are obtained that are superior to Pt/C catalyst. A low overpotential of 285 mV at an anodic current density of 10 mA cm⁻² during the OER process is obtained that is superior to the IrO₂ catalyst; and lower Tafel plot and good durability are also observed. Our findings provide a new strategy for the fabrication of an efficient bifunctional electrocatalyst for OER and ORR.

开发成本有效，高效且易于制备的用于氧还原（ORR）和析出反应（OER）的电催化剂对于一系列可再生能源技术至关重要。本文中，我们通过原位方法报道了独特的Co ₄ N纳米颗粒负载在用于OER和ORR的gC ₃ N ₄纳米管（Co ₄ N @ CNNT）双功能电催化剂上。高度分散的Co ₄ N纳米颗粒作为活性位点聚集在gC ₃ N ₄的顶部碳纳米管（CNNT），而光滑CNNT的六倍腔体的外径为48 nm，内径为22 nm，是锚定位点，优先与活性位点配合。受益于独特的结构特征，本征金属Co ₄ N @ CNNT具有较高的电催化性能。电化学研究表明，Co ₄ N @ CNNT的起始电势为0.94 V，半波电势为0.86 V，优于Pt / C催化剂。在OER过程中，阳极电流密度为10 mA cm ^-2时，低过电位为285 mV，优于IrO ₂催化剂; 还观察到较低的塔菲尔曲线和良好的耐久性。我们的发现为制备用于OER和ORR的高效双功能电催化剂提供了新的策略。