The development of efficient and low-cost bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for the successful implementation of water splitting technologies, which represents a promising and appealing solution to the sustainable-energy conversion. In this work, a nanocomposite electrocatalyst based on partially oxidized Ni nanoparticles supported on Ni-N co-doped carbon nanofibers (PO-Ni/Ni-N-CNFs) was developed using low-cost hydrothermal carbonaceous nanofibers, pyrrole, and NiCl₂ as precursors. Benefiting from effective active sites, mesoporous structure, and interlinked nanofiber network, the as-obtained nanocomposite electrocatalyst exhibited superior catalytic activity and durability for both HER and OER in alkaline media. Furthermore, the practical application of PO-Ni/Ni-N-CNFs as a bifunctional catalyst for overall water splitting was demonstrated, with a current density of 10 mA cm⁻² achieved at the voltage of 1.69 V.

高效，低成本的用于氢分解反应（HER）和氧分解反应（OER）的双功能电催化剂的开发对于成功实施水分解技术至关重要，这是可持续能源转化的有希望和有吸引力的解决方案。在这项工作中，使用低成本的水热碳质纳米纤维，吡咯和NiCl ₂开发了基于部分氧化的Ni纳米颗粒的纳米复合电催化剂，该纳米颗粒负载在Ni-N共掺杂碳纳米纤维（PO-Ni / Ni-N-CNFs）上。作为先驱。得益于有效的活性位点，介孔结构和相互连接的纳米纤维网络，所获得的纳米复合电催化剂对碱性介质中的HER和OER均显示出优异的催化活性和耐久性。此外，证明了PO-Ni / Ni-N-CNFs作为用于整体水分解的双官能催化剂的实际应用，在1.69V的电压下实现了10mA cm ^-2的电流密度。