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Nitrogen-Doped PtNi Catalysts on Polybenzimidazole-Functionalized Carbon Support for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-06 , DOI: 10.1021/acsami.2c05717 Chenzhao Li 1, 2 , Liang Song 3 , Xueru Zhao 3 , Kotaro Sasaki 3 , Jian Xie 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-06 , DOI: 10.1021/acsami.2c05717 Chenzhao Li 1, 2 , Liang Song 3 , Xueru Zhao 3 , Kotaro Sasaki 3 , Jian Xie 1
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PtM (M = 3d transition metals) alloys are known as the promising oxygen reduction reaction catalysts and have been considered as the replacement of pure Pt catalysts for the commercialization of proton exchange membrane fuel cells. Although great progress has been made in the past three decades, the performance and durability of PtM catalysts still face stringent challenges from practical applications. Functionalization of a catalyst carbon support with nitrogen-contained groups can add charges onto its surface, which can be utilized to build a more complete ionomer/catalyst interface, to reduce the catalyst particle size, and to improve particle size distribution. Nitriding of PtNi catalysts can effectively improve the catalyst activity and stability by the modification of lattice strain. Hereby, we propose a synergistic approach of combining polybenzimidazole-grafted Vulcan XC72 carbon as the catalyst carbon support and the nitriding of PtNi to develop PtNiN/XC72-polybenzimidazole catalysts. Such PtNiN/XC72-PBI catalysts exhibit the excellent performance of fuel cell membrane electrode assembly (i.e., mass activity, 440 mA mgPt–1; electrochemical surface area, 51 m2 gPt–1; and rated power density, 836 mW cm–2) as well as promising catalyst stability. The developed PtNiN/XC72-PBI meets the US DOE 2020 targets of mass activity for the fuel cell catalysts. This work provides a novel approach and a promising pathway on the development of the catalyst using such a synergistic approach─modification of the catalyst structure by nitrogen doping and functionalization of carbon support by polybenzimidazole for both high performance and high durability.
中文翻译：
聚苯并咪唑官能化碳载体上氮掺杂 PtNi 催化剂用于聚合物电解质膜燃料电池中的氧还原反应
PtM（M = 3d过渡金属）合金被认为是有前途的氧还原反应催化剂，并被认为是质子交换膜燃料电池商业化中纯Pt催化剂的替代品。尽管过去三十年取得了巨大进步，但PtM催化剂的性能和耐久性仍然面临实际应用的严峻挑战。具有含氮基团的催化剂碳载体的官能化可以在其表面上添加电荷，这可用于构建更完整的离聚物/催化剂界面，以减小催化剂粒度并改善粒度分布。 PtNi催化剂氮化可以通过晶格应变的改变有效提高催化剂的活性和稳定性。因此，我们提出了一种将聚苯并咪唑接枝的 Vulcan XC72 碳作为催化剂碳载体与 PtNi 氮化相结合的协同方法，以开发 PtNiN/XC72-聚苯并咪唑催化剂。这种PtNiN/XC72-PBI催化剂表现出燃料电池膜电极组件的优异性能（即质量活性，440 mA mg Pt –1 ；电化学表面积，51 m 2 g Pt –1 ；额定功率密度，836 mW cm –2 ) 以及有前途的催化剂稳定性。开发的 PtNiN/XC72-PBI 满足美国能源部 2020 年燃料电池催化剂质量活性目标。这项工作为使用这种协同方法开发催化剂提供了一种新颖的方法和有前途的途径——通过氮掺杂对催化剂结构进行改性，并通过聚苯并咪唑对碳载体进行功能化，以实现高性能和高耐久性。
更新日期：2022-06-06
中文翻译：
聚苯并咪唑官能化碳载体上氮掺杂 PtNi 催化剂用于聚合物电解质膜燃料电池中的氧还原反应
PtM（M = 3d过渡金属）合金被认为是有前途的氧还原反应催化剂，并被认为是质子交换膜燃料电池商业化中纯Pt催化剂的替代品。尽管过去三十年取得了巨大进步，但PtM催化剂的性能和耐久性仍然面临实际应用的严峻挑战。具有含氮基团的催化剂碳载体的官能化可以在其表面上添加电荷，这可用于构建更完整的离聚物/催化剂界面，以减小催化剂粒度并改善粒度分布。 PtNi催化剂氮化可以通过晶格应变的改变有效提高催化剂的活性和稳定性。因此，我们提出了一种将聚苯并咪唑接枝的 Vulcan XC72 碳作为催化剂碳载体与 PtNi 氮化相结合的协同方法，以开发 PtNiN/XC72-聚苯并咪唑催化剂。这种PtNiN/XC72-PBI催化剂表现出燃料电池膜电极组件的优异性能（即质量活性，440 mA mg Pt –1 ；电化学表面积，51 m 2 g Pt –1 ；额定功率密度，836 mW cm –2 ) 以及有前途的催化剂稳定性。开发的 PtNiN/XC72-PBI 满足美国能源部 2020 年燃料电池催化剂质量活性目标。这项工作为使用这种协同方法开发催化剂提供了一种新颖的方法和有前途的途径——通过氮掺杂对催化剂结构进行改性，并通过聚苯并咪唑对碳载体进行功能化，以实现高性能和高耐久性。
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