封装有Ni掺杂FeP纳米颗粒的氮掺杂碳纳米管作为双功能电催化剂

Interwoven N-doped carbon nanotubes with capped Ni-doped FeP as double-functional electrocatalysts for overall seawater electrolysis

清洁能源支撑的电解海水技术是公认的最有前途的未来可持续绿色制氢途径.商用贵金属催化剂储量低、成本昂贵,且在复杂离子环境下容易快速失活的特性,严重阻碍了电解海水技术的工业化发展.本工作通过Ni掺杂Fe团簇催化碳纳米管生长,再气体磷化法,成功构建了一种含Ni掺杂FeP纳米颗粒封端的新型氮掺杂碳纳米管交织结构(NFP@NC).独特的N-CNTs交织网络,以及N-CNTs和Ni掺杂FeP的强相互作用提供了快速的传质途径,提高了气体逸出效率,并显著增强了催化剂稳定性.NFP@NC在10 mA cm^(−2)的电流密度下的析氧反应过电位为280 mV,析氢反应过电位为206 mV,低于大多数报道的铁基催化剂.本研究为构建交织的碳纳米管网络和制备高性能双功能海水电解催化剂提供了一种有效的途径.

Seawater electrolysis technology powered by clean new energy is recognized as the most promising sustainable and green hydrogen preparation method.The extremely expensive and low reserve of commercially available noble metal electrocatalysts and the rapid inactivation of catalysts under complex ionic environments hamper their industrialization.Herein,a novel interwoven N-doped carbon nanotube(N-CNTs)structure capped with Ni-doped FeP nanoparticles(NFP@NC)is successfully developed by Ni-doped Fe cluster-catalyzed CNT growth process and the gas phosphating method.The unique interwoven nanotube network and strong interaction of Ni-doped FeP and N-CNTs provide fast mass transfer and gas bubble emission,as well as drastically enhanced stability.The NFP@NC presents an overpotential of 280 mV for the oxygen evolution reaction and 206 mV for the hydrogen evolution reaction at 10 mA cm^(−2),lower than most reported iron-based catalysts.This research provides an effective way to construct interwoven CNT networks as high-performance bifunctional seawater electrolysis catalysts.