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Stabilized Pt Cluster-Based Catalysts Used as Low-Loading Cathode in Proton-Exchange Membrane Fuel Cells
ACS Energy Letters ( IF 22.0 ) Pub Date : 2020-08-24 , DOI: 10.1021/acsenergylett.0c01748
Siyuan Zhu 1, 2 , Xian Wang 1, 2 , Ergui Luo 1 , Liting Yang 1, 2 , Yuyi Chu 1, 2 , Liqin Gao 1 , Zhao Jin 1 , Changpeng Liu 1, 2 , Junjie Ge 1, 2 , Wei Xing 1, 2
Affiliation  

Lowering the Pt catalyst loading in fuel cell cathodes without sacrificing performance remains a topic of interest. However, achieving such a goal is highly challenging, because lowering the Pt loading not only reduces the overall kinetics of the oxygen reduction reaction but also causes a serious mass-transfer issue in the high-current density domain (HCD). Herein, we overcome this difficulty by obtaining a highly active and stable Pt cluster-based catalyst, where the decrease in loading is completely compensated by the extraordinarily high electrochemical specific area and high dispersion of the platinum clusters. The Pt clusters, with average size of 1.3 ± 0.4 nm and atomic utilization rate up to 32.81%, are highly stabilized because of the strong anchoring effect of the N,P-doped carbon nanosheets. The final Pt-9.3@NPC catalyst outcompetes commercial Pt/C catalyst in terms of activity and stability during potential cycling. In addition, the cell assembled by Pt-9.3@NPC as cathode (0.05 mgPt cm–2) conveys much higher performance (1071 mW cm–2) in H2/air mode than the counterpart commercial catalysts (853 mW cm–2, 0.1 mgPt cm–2) and much lower voltage loss at the HCD, clearly evidencing the success in surmounting the mass-transfer problem.

中文翻译:

稳定的基于Pt团簇的催化剂在质子交换膜燃料电池中用作低负载阴极

在不牺牲性能的情况下降低燃料电池阴极中的Pt催化剂负载仍然是一个令人关注的话题。但是,实现这一目标具有很高的挑战性,因为降低Pt负载量不仅会降低氧还原反应的整体动力学,而且还会在高电流密度域(HCD)中引起严重的传质问题。在这里,我们通过获得高活性和稳定的基于Pt簇的催化剂克服了这一困难,其中负载的下降完全被铂簇的极高的电化学比表面积和高分散性所补偿。Pt团簇的平均尺寸为1.3±0.4 nm,原子利用率高达32.81%,由于N,P掺杂的碳纳米片的强大锚固作用而高度稳定。最后的Pt-9。3 @ NPC催化剂在潜在循环中的活性和稳定性方面超过了商用Pt / C催化剂。另外,电池由Pt-9.3@NPC组装成阴极(0.05 mgPt cm –2)在H 2 /空气模式下的传输性能(1071 mW cm –2)比相应的商用催化剂(853 mW cm –2,0.1 mg Pt cm –2)要高得多,而HCD的电压损耗要低得多,清楚地证明了在克服大规模转移问题方面的成功。
更新日期:2020-08-24
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