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首页> 外文期刊>Journal of power sources >Nitrogen-doped hollow carbon spheres as highly effective multifunctional electrocatalysts for fuel cells, Zn-air batteries, and water-splitting electrolyzers
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Nitrogen-doped hollow carbon spheres as highly effective multifunctional electrocatalysts for fuel cells, Zn-air batteries, and water-splitting electrolyzers

机译：氮掺杂空心碳球可作为燃料电池，锌空气电池和水分解电解槽的高效多功能电催化剂

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摘要

Clean energy conversion technologies require low-cost multifunctional catalysts. In this work, nitrogen-doped hollow carbon spheres with nanoporous shells (NHCS-W) are prepared by using the ionic liquid 1-butyl-3-methylimidazolium chloride as a source of both carbon and nitrogen. A systematic investigation of the electrocatalytic performance and durability of NHCS-W reveals excellent performance and high stabilities for the oxygen reduction reaction, oxygen evolution reaction, and hydrogen evolution reaction in alkaline electrolytes. This multifunctionality facilitates promising practical applicability for NHCS-W. An alkaline exchange membrane fuel cell (AEMFC) with NHCS-W as the cathode electrocatalyst has a peak power density of 109 mW cm(-2), which is 7 mW cm(-2) higher than that of an AEMFC with Pt/C (20%) as the cathode electrocatalyst. By using NHCS-W as an air electrode, two rechargeable Zn-air batteries in series can power a 5 mm red light-emitting diode (similar to 2.2 V). Moreover, a cell voltage of only 1.61 V is needed to achieve a current density of 10 mA cm(-2) in a water-splitting electrolyzer employing NHCS-W as both the cathode and anode catalysts. This work reveals the potential of ionic liquid precursors for constructing nitrogen-doped carbon-based materials for a wide variety of electrocatalytic applications.
机译：清洁能源转化技术需要低成本的多功能催化剂。在这项工作中，通过使用离子液体1-丁基-3-甲基咪唑鎓氯化物作为碳和氮的来源，制备了具有纳米孔壳的掺杂氮的空心碳球（NHCS-W）。对NHCS-W的电催化性能和耐久性的系统研究表明，碱性电解质中的氧还原反应，氧释放反应和氢释放反应具有出色的性能和较高的稳定性。这种多功能性有利于NHCS-W的实际应用。以NHCS-W作为阴极电催化剂的碱性交换膜燃料电池（AEMFC）的峰值功率密度为109 mW cm（-2），比具有Pt / C的AEMFC的峰值功率密度高7 mW cm（-2）。 （20％）作为阴极电催化剂。通过使用NHCS-W作为空气电极，两个串联的可再充电Zn-空气电池可以为一个5毫米红色发光二极管（类似于2.2 V）供电。此外，在采用NHCS-W作为阴极和阳极催化剂的水分解电解槽中，仅需要1.61 V的电池电压即可达到10 mA cm（-2）的电流密度。这项工作揭示了离子液体前体在构建用于多种电催化应用的氮掺杂碳基材料方面的潜力。

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