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Ir/Co-N-C的制备及其氧双功能催化性能研究
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Abstract:
构建清洁低碳的能源体系已成为全球可持续发展的关键任务，在这一转型过程中，发展高效储能技术对于提升可再生能源利用效率具有战略意义。开发具有氧双功能活性(OER/ORR)的催化剂对于燃料电池、金属空气电池器件的效率是至关重要的，贵金属铱(Ir)表现出比较优异的OER性能，然而，Ir作为贵金属，储量极为稀少，致使其成本居高不下，这一现状成为阻碍其大规模商业化推广应用的严重桎梏。开发兼具高活性、高稳定性且成本可控的非贵金属催化剂已成为推动锌空气电池产业化进程的核心课题。本文利用两步退火法结合湿法浸渍制备了低载量Ir的Ir/Co-N-C。首先通过制备金属有机骨架衍生的Co-N-C，再利用浸渍法将Ir负载在Co-N-C上获得的具有双金属位点的Ir/Co-N-C，过电位为304 mV，其过电位低于商业催化剂IrO2，且E1/2 (半波电位)达到0.824 V，表现出良好的双功能催化活性。Ir/Co-N-C的制备还提高了贵金属的原子利用率。通过本文的研究工作为双金属位点的双功能氧电催化剂的制备具有一定的参考意义。
Constructing a clean and low-carbon energy system has become a crucial task for global sustainable development. In the process of this transformation, the development of efficient energy storage technologies is of strategic significance for improving the utilization efficiency of renewable energy. Developing catalysts with bifunctional oxygen activity (OER/ORR) is of vital importance for the efficiency of fuel cells and metal-air battery devices. The noble metal iridium (Ir) exhibits relatively excellent OER performance. However, as a noble metal, Ir has an extremely scarce reserve, leading to its persistently high cost. This situation has become a serious obstacle hindering its large-scale commercial promotion and application. Developing non-noble metal catalysts with high activity, high stability, and controllable cost has become the core issue in promoting the industrialization process of zinc-air batteries. In this paper, Ir/Co-N-C was prepared by using a two-step annealing method combined with the impregnation method. Firstly, Co-N-C derived from a metal-organic framework was prepared, and then Ir was loaded onto Co-N-C by the impregnation method to obtain Ir/Co-N-C with bimetallic sites. The overpotential of Ir/Co-N-C is 304 mV, which is lower than that of the commercial catalyst IrO？, and its E？/？ (half-wave potential) reaches 0.824 V, showing good bifunctional catalytic activity. The preparation of Ir/Co-N-C also improves the atomic utilization rate of noble metals. The research work in this paper has certain reference significance for the preparation of bifunctional oxygen electro-catalysts with bimetallic sites.
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