{"title":"影响 HT-PEMFC 中铂基 ORR 电催化剂稳定性的因素:理论研究","authors":"","doi":"10.1016/j.commatsci.2024.113309","DOIUrl":null,"url":null,"abstract":"<div><p>Electrocatalyst stability is a key parameter for commercializing high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs). Here, we used density functional theory (DFT) to investigate the stability of Pt-based electrocatalysts by calculating the binding energy (ΔE<sub>b</sub>) of surface Pt atoms under working conditions. Our results show that Pt(1<!--> <!-->1<!--> <!-->1) is more stable than Pt(1<!--> <!-->0<!--> <!-->0) and Pt(1<!--> <!-->1<!--> <!-->0) under vacuum conditions. Stress hurts the stability of Pt(1<!--> <!-->1<!--> <!-->1), regardless of compressive or tensile stress. Most of the transition metals alloyed with Pt improve the stability of Pt(1<!--> <!-->1<!--> <!-->1), especially PtV, PtY, and PtTa, which increase the ΔE<sub>b</sub> by 0.60–0.70 eV (ΔΔE<sub>b</sub>). However, the stability of Pt is significantly destroyed under the working conditions of oxygen reduction reaction (ORR). The specific adsorption of ORR intermediates and electrolyte ions decreases the ΔE<sub>b</sub> of Pt(1<!--> <!-->1<!--> <!-->1) by 0.35–0.95 eV, and the effect of PO<sub>4</sub><sup>3-*</sup> is more significant. Furthermore, when the electric field of the electrochemical double layer is coupled with PO<sub>4</sub><sup>3-*</sup> specific adsorption, ΔΔE<sub>b</sub> further increases to 1.12 eV. Our results highlight the importance of the intrinsic ΔE<sub>b</sub> and the working conditions for the stability of Pt-based electrocatalysts. This work provides important guidelines for the design of stable ORR electrocatalysts for HT-PEMFCs.</p></div>","PeriodicalId":10650,"journal":{"name":"Computational Materials Science","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Factors influencing the stability of Pt-based ORR electrocatalysts in HT-PEMFCs: A theoretical investigation\",\"authors\":\"\",\"doi\":\"10.1016/j.commatsci.2024.113309\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Electrocatalyst stability is a key parameter for commercializing high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs). Here, we used density functional theory (DFT) to investigate the stability of Pt-based electrocatalysts by calculating the binding energy (ΔE<sub>b</sub>) of surface Pt atoms under working conditions. Our results show that Pt(1<!--> <!-->1<!--> <!-->1) is more stable than Pt(1<!--> <!-->0<!--> <!-->0) and Pt(1<!--> <!-->1<!--> <!-->0) under vacuum conditions. Stress hurts the stability of Pt(1<!--> <!-->1<!--> <!-->1), regardless of compressive or tensile stress. Most of the transition metals alloyed with Pt improve the stability of Pt(1<!--> <!-->1<!--> <!-->1), especially PtV, PtY, and PtTa, which increase the ΔE<sub>b</sub> by 0.60–0.70 eV (ΔΔE<sub>b</sub>). However, the stability of Pt is significantly destroyed under the working conditions of oxygen reduction reaction (ORR). The specific adsorption of ORR intermediates and electrolyte ions decreases the ΔE<sub>b</sub> of Pt(1<!--> <!-->1<!--> <!-->1) by 0.35–0.95 eV, and the effect of PO<sub>4</sub><sup>3-*</sup> is more significant. Furthermore, when the electric field of the electrochemical double layer is coupled with PO<sub>4</sub><sup>3-*</sup> specific adsorption, ΔΔE<sub>b</sub> further increases to 1.12 eV. Our results highlight the importance of the intrinsic ΔE<sub>b</sub> and the working conditions for the stability of Pt-based electrocatalysts. This work provides important guidelines for the design of stable ORR electrocatalysts for HT-PEMFCs.</p></div>\",\"PeriodicalId\":10650,\"journal\":{\"name\":\"Computational Materials Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2024-08-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Computational Materials Science\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0927025624005305\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computational Materials Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927025624005305","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Factors influencing the stability of Pt-based ORR electrocatalysts in HT-PEMFCs: A theoretical investigation
Electrocatalyst stability is a key parameter for commercializing high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs). Here, we used density functional theory (DFT) to investigate the stability of Pt-based electrocatalysts by calculating the binding energy (ΔEb) of surface Pt atoms under working conditions. Our results show that Pt(1 1 1) is more stable than Pt(1 0 0) and Pt(1 1 0) under vacuum conditions. Stress hurts the stability of Pt(1 1 1), regardless of compressive or tensile stress. Most of the transition metals alloyed with Pt improve the stability of Pt(1 1 1), especially PtV, PtY, and PtTa, which increase the ΔEb by 0.60–0.70 eV (ΔΔEb). However, the stability of Pt is significantly destroyed under the working conditions of oxygen reduction reaction (ORR). The specific adsorption of ORR intermediates and electrolyte ions decreases the ΔEb of Pt(1 1 1) by 0.35–0.95 eV, and the effect of PO43-* is more significant. Furthermore, when the electric field of the electrochemical double layer is coupled with PO43-* specific adsorption, ΔΔEb further increases to 1.12 eV. Our results highlight the importance of the intrinsic ΔEb and the working conditions for the stability of Pt-based electrocatalysts. This work provides important guidelines for the design of stable ORR electrocatalysts for HT-PEMFCs.
期刊介绍:
The goal of Computational Materials Science is to report on results that provide new or unique insights into, or significantly expand our understanding of, the properties of materials or phenomena associated with their design, synthesis, processing, characterization, and utilization. To be relevant to the journal, the results should be applied or applicable to specific material systems that are discussed within the submission.