High density iridium synergistic sites boosting CO-tolerate performance for PEMFC anode

IF 42.9 Q1 ELECTROCHEMISTRY
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Abstract

The usage of cheap crude H2 in proton-exchange membrane fuel cells (PEMFCs) is still unrealistic to date, due to the suffering of the current Pt based nano-catalysts from impurities such as CO in anode. Recently, synergistic active sites between single atom (SA) and nanoparticle (NP) have been found to be promising for overcoming the poisoning problem. However, lengthening the nanoparticle-single atom (SA–NP) interface, i.e., constructing high density synergistic active sites, remains highly challenging. Herein, we present a new strategy based on molecular fusion strategy to create abundant SA–NP interfaces, with high density SA–NP interfaces created on a two dimensional nitrogen doped carbon nanosheets (Ir-SACs&NPs/NC). Owing to the abundance of SA–NP interface sites, the catalyst was empowered with a high tolerance towards up to 1000 ​ppm CO in H2 feed. These findings provide guidelines for the design and construction of active and anti-poisoning catalysts for PEMFC anode.

Abstract Image

Abstract Image

高密度铱协同位点可提高 PEMFC 阳极的一氧化碳溶解性能
在质子交换膜燃料电池(PEMFCs)中使用廉价的粗制 H2 至今仍不现实,原因是目前的铂基纳米催化剂受到阳极中 CO 等杂质的影响。最近,人们发现单原子(SA)和纳米粒子(NP)之间的协同活性位点有望克服中毒问题。然而,延长纳米粒子-单原子(SA-NP)界面,即构建高密度的协同活性位点,仍然极具挑战性。在此,我们提出了一种基于分子融合策略的新策略,在二维掺氮碳纳米片(Ir-SACs&NPs/NC)上创建高密度的SA-NP界面,从而创建丰富的SA-NP界面。由于存在大量的 SA-NP 界面位点,催化剂对 H2 进料中高达 1000 ppm 的 CO 具有很高的耐受性。这些发现为设计和制造用于 PEMFC 阳极的活性抗中毒催化剂提供了指导。
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CiteScore
33.70
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