International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2022-07-09 , DOI: 10.1016/j.ijhydene.2022.06.104
Chengyan Zhou , Xu Han , Fengyuan Zhu , Xiaoli Zhang , Yidong Lu , Jiangping Lang , Xueqin Cao , Hongwei Gu
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The pivotal challenge of electrocatalysis remains the development of highly effective electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In this work, a universal strategy of preparing the encapsulation of Co-based multimetallic alloys/oxide nanoparticles in nitrogen-doped carbon nanotubes (named CoM@CNTs, M = Ni/Mn/Fe) was induced by annealing mixtures of the as-synthesized precursor, ethanol and different metallic acetates, including binary CoNi@CNTs, ternary CoNi/MnO@CNTs and quaternary CoNiFe/MnO@CNTs. By virtue of its unique structure with a high electrical conductive network based on CNT substrates, abundant catalytic active sites supplied by multimetallic nanoparticles and protection against nanoparticle corrosion by N-doped carbon layers, the as-synthesized CoNiFe/MnO@CNTs electrocatalyst has remarkable HER properties with a low overpotential of 122 mV and OER activity with a low overpotential of 275 mV at 10 mA cm−2 and excellent stability and durability under long-term testing in alkaline solutions. Therefore, this strategy will provide a new route for fabricating multimetallic-based CNTs as HER/OER electrocatalysts with excellent stability and high catalytic activity.
中文翻译:
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轻松合成 Co 基多金属合金/氧化物纳米粒子掺杂氮的碳纳米管作为 HER/OER 的电催化剂
电催化的关键挑战仍然是开发用于析氢反应(HER)和析氧反应(OER)的高效电催化剂。在这项工作中,通过对合成后的混合物进行退火,诱导了一种将钴基多金属合金/氧化物纳米粒子封装在氮掺杂碳纳米管(命名为 CoM@CNTs,M = Ni/Mn/Fe)中的通用策略。前驱体、乙醇和不同的金属醋酸盐,包括二元 CoNi@CNTs、三元 CoNi/MnO@CNTs 和四元 CoNiFe/MnO@CNTs。凭借其独特的结构、基于 CNT 基底的高导电网络、多金属纳米粒子提供的丰富催化活性位点以及 N 掺杂碳层对纳米粒子腐蚀的保护,-2以及在碱性溶液中的长期测试下具有出色的稳定性和耐久性。因此,该策略将为制备多金属基碳纳米管作为具有优异稳定性和高催化活性的 HER/OER 电催化剂提供一条新途径。