Symmetrical solid oxide fuel cells(SSOFCs)could be alternative energy conversion devices due to their simple fabrication process and low cost.Herein,perovskite La_(0.6)Ce_(0.1)Sr_(0.3)Fe_(0.95)Ru_(0.05O3-δ)(LCSFR)was...Symmetrical solid oxide fuel cells(SSOFCs)could be alternative energy conversion devices due to their simple fabrication process and low cost.Herein,perovskite La_(0.6)Ce_(0.1)Sr_(0.3)Fe_(0.95)Ru_(0.05O3-δ)(LCSFR)was synthesized and evaluated as a high-performance electrode for SSOFCs based on the electrolyte of La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM).LCSFR retains their stable perovskite crystal structure in both reducing and oxidizing atmospheres,though a minor amount of LaSrFeO4 phase is present under reducing conditions.Morphology investigation shows that homogeneously dispersed Ru metallic nanoparticles are exsolved on the surface of LCSFR after being reduced.The polarization resistance(Rp)of LCSFR-CGO(Ce_(0.9)Gd_(0.1O2-δ))is about 0.11Ω·cm^(2)at 800℃in air,while the value of Rp for LCSFR-CGO in wet H_(2)(3%H_(2)O)increases up to 0.32Ω·cm^(2).The symmetrical LCSFR-CGOILSGMILCSFR-CGO cell demonstrates a performance with an open circuit potential(OCV)of 1.07 V and a maximum peak power density of 904 mW/cm^(2)at 800℃using wet H2 as the fuel.This high performance indicates that LCSFR is a candidate electrode for SSOFCs.展开更多
Symmetric solid oxide fuel cells(SSOFCs)have gained significant attention owing to their cost-effective fabrication,superior thermomechanical compatibility,and enhanced long-term stability.Ammonia(NH_(3)),an excellent...Symmetric solid oxide fuel cells(SSOFCs)have gained significant attention owing to their cost-effective fabrication,superior thermomechanical compatibility,and enhanced long-term stability.Ammonia(NH_(3)),an excellent hydrogen carrier,is a promising clean energy source with high energy density,easy transportation and storage.Notably,NH_(3) contained only nitrogen and hydrogen,making it carbon-free.In this study,we synthesize the highly active symmetric electrode material Pr_(0.32)Sr_(0.48)Fe_(0.75)Ni_(0.2)Ru_(0.05)O_(3-δ)(PSFNRu)by replacing partial Fe in Pr_(0.32)Sr_(0.48)Fe_(0.8)Ni_(0.2)O_(3-δ)(PSFN)with 5 mol%Ru.PSFNRu possesses a sufficient quantity of oxygen vacancies,with the capacity to in-situ exsolved alloy nanoparticles(ANPs)in a reducing atmosphere.This nanocomposite is found to promote electrochemical reactions.For example,at 800℃,the SSOFC employing the PSFNRu electrode achieves a peak power density(PPD)of 736 mW·cm^(-2) when using hydrogen(H_(2))as the fuel.Under NH_(3) conditions,the cell delivers a PPD of 547 mW·cm^(-2),significantly surpassing the 462 mW·cm^(-2) recorded for a comparable cell employing the PSFN electrode.The enhanced cell performance is mainly ascribed to Ru doping,which boosts the ORR activity and facilitates the in-situ exsolution of ANPs at the anode,increasing active sites and accelerating NH_(3) decomposition.In addition,remarkable operational stability of the single cell(172 h under NH_(3) fuel at 700℃)is also demonstrated.These encouraging experimental results highlight the superiority of PSFNRu as the bi-functional electrodes for direct ammonia symmetric solid oxide fuel cells(DA-SSOFCs),and providing a potential and reliable pathway towards accelerating the development of DA-SSOFCs.展开更多
基金Project supported by the State of Grid(SGSDJN00FZQT1700446)。
文摘Symmetrical solid oxide fuel cells(SSOFCs)could be alternative energy conversion devices due to their simple fabrication process and low cost.Herein,perovskite La_(0.6)Ce_(0.1)Sr_(0.3)Fe_(0.95)Ru_(0.05O3-δ)(LCSFR)was synthesized and evaluated as a high-performance electrode for SSOFCs based on the electrolyte of La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM).LCSFR retains their stable perovskite crystal structure in both reducing and oxidizing atmospheres,though a minor amount of LaSrFeO4 phase is present under reducing conditions.Morphology investigation shows that homogeneously dispersed Ru metallic nanoparticles are exsolved on the surface of LCSFR after being reduced.The polarization resistance(Rp)of LCSFR-CGO(Ce_(0.9)Gd_(0.1O2-δ))is about 0.11Ω·cm^(2)at 800℃in air,while the value of Rp for LCSFR-CGO in wet H_(2)(3%H_(2)O)increases up to 0.32Ω·cm^(2).The symmetrical LCSFR-CGOILSGMILCSFR-CGO cell demonstrates a performance with an open circuit potential(OCV)of 1.07 V and a maximum peak power density of 904 mW/cm^(2)at 800℃using wet H2 as the fuel.This high performance indicates that LCSFR is a candidate electrode for SSOFCs.
基金granted by the National Natural Science Foundation of China(Nos.22309067 and 22279057)Financial Program of BJAST(No.25CA002).
文摘Symmetric solid oxide fuel cells(SSOFCs)have gained significant attention owing to their cost-effective fabrication,superior thermomechanical compatibility,and enhanced long-term stability.Ammonia(NH_(3)),an excellent hydrogen carrier,is a promising clean energy source with high energy density,easy transportation and storage.Notably,NH_(3) contained only nitrogen and hydrogen,making it carbon-free.In this study,we synthesize the highly active symmetric electrode material Pr_(0.32)Sr_(0.48)Fe_(0.75)Ni_(0.2)Ru_(0.05)O_(3-δ)(PSFNRu)by replacing partial Fe in Pr_(0.32)Sr_(0.48)Fe_(0.8)Ni_(0.2)O_(3-δ)(PSFN)with 5 mol%Ru.PSFNRu possesses a sufficient quantity of oxygen vacancies,with the capacity to in-situ exsolved alloy nanoparticles(ANPs)in a reducing atmosphere.This nanocomposite is found to promote electrochemical reactions.For example,at 800℃,the SSOFC employing the PSFNRu electrode achieves a peak power density(PPD)of 736 mW·cm^(-2) when using hydrogen(H_(2))as the fuel.Under NH_(3) conditions,the cell delivers a PPD of 547 mW·cm^(-2),significantly surpassing the 462 mW·cm^(-2) recorded for a comparable cell employing the PSFN electrode.The enhanced cell performance is mainly ascribed to Ru doping,which boosts the ORR activity and facilitates the in-situ exsolution of ANPs at the anode,increasing active sites and accelerating NH_(3) decomposition.In addition,remarkable operational stability of the single cell(172 h under NH_(3) fuel at 700℃)is also demonstrated.These encouraging experimental results highlight the superiority of PSFNRu as the bi-functional electrodes for direct ammonia symmetric solid oxide fuel cells(DA-SSOFCs),and providing a potential and reliable pathway towards accelerating the development of DA-SSOFCs.
