以煅烧三聚氰胺后形成的C3N4材料为氮源,柠檬酸为碳源,六水合三氯化铁为铁源,通过两步法合成FeN/C催化剂,并考察该催化剂对氧还原反应的电催化能力。采用XRD、SEM、Raman、XPS等表征手段对Fe-N/C催化剂的晶体结构和元素化学状态进行综...以煅烧三聚氰胺后形成的C3N4材料为氮源,柠檬酸为碳源,六水合三氯化铁为铁源,通过两步法合成FeN/C催化剂,并考察该催化剂对氧还原反应的电催化能力。采用XRD、SEM、Raman、XPS等表征手段对Fe-N/C催化剂的晶体结构和元素化学状态进行综合评价;以CV和LSV等电化学测试手段探究Fe-N/C催化剂的氧还原电催化能力。研究结果表明,Fe-N/C催化剂具有管状形貌、较高的石墨氮含量和较佳的氧还原电催化能力。通过对电化学性能关键参数进行分析发现,Fe-N/C催化剂的起始电位是1.071 V vs. RHE,半波电位是0.911 V vs. RHE,极限电流密度是5.943 mA/cm2。展开更多
Li-S batteries have attracted considerable interest as nextgeneration energy storage devices owing to high energy density and the natural abundance of sulfur.However,the practical applications of Li-S batteries are ha...Li-S batteries have attracted considerable interest as nextgeneration energy storage devices owing to high energy density and the natural abundance of sulfur.However,the practical applications of Li-S batteries are hampered by the shuttle effect of soluble lithium polysulfides(LPS),which results in low cycle stability.Herein,a functional interlayer has been developed to efficiently regulate the LPS and enhance the sulfur utilization using hierarchical nanostructure of C3 N4(t-C3 N4)embedded with Fe304 nanospheres.t-C3 N4 exhibits high surface area and strong anchoring of LPS,and the Fe3 O4/t-C3 N4 accelerates the anchoring of LPS and improves the electronic pathways.The combination of these materials leads to remarkable battery performance with 400%improvement in a specific capacity and a low capacity decay per cycle of 0.02%at 2 C over 1000 cycles,and stable cycling at 6.4 mg cm-2 for high-sulfur-loading cathode.展开更多
文摘以煅烧三聚氰胺后形成的C3N4材料为氮源,柠檬酸为碳源,六水合三氯化铁为铁源,通过两步法合成FeN/C催化剂,并考察该催化剂对氧还原反应的电催化能力。采用XRD、SEM、Raman、XPS等表征手段对Fe-N/C催化剂的晶体结构和元素化学状态进行综合评价;以CV和LSV等电化学测试手段探究Fe-N/C催化剂的氧还原电催化能力。研究结果表明,Fe-N/C催化剂具有管状形貌、较高的石墨氮含量和较佳的氧还原电催化能力。通过对电化学性能关键参数进行分析发现,Fe-N/C催化剂的起始电位是1.071 V vs. RHE,半波电位是0.911 V vs. RHE,极限电流密度是5.943 mA/cm2。
基金supported by the National Natural Science Foundation of China(No.12105071)the Anhui Provincial Natural Science Foundation(No.2108085QA32)+3 种基金the Special Project of Provincial Scientific Research Platform of Hefei Normal University in 2020(No.2020PT16)the Scientific Research Start-up Fund for Introduction of High-level Talents of HFNU in 2020(No.2020rcjj03)Anhui Provincial Funds for Distinguished Young Scientists of the Nature Science(No.1808085JQ13)the Project of Leading Backbone Talents in Anhui Provincial Undergraduate Universities.
基金supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(NRF-2019R1A2C1003594 and NRF-2019R1A2C1003551)。
文摘Li-S batteries have attracted considerable interest as nextgeneration energy storage devices owing to high energy density and the natural abundance of sulfur.However,the practical applications of Li-S batteries are hampered by the shuttle effect of soluble lithium polysulfides(LPS),which results in low cycle stability.Herein,a functional interlayer has been developed to efficiently regulate the LPS and enhance the sulfur utilization using hierarchical nanostructure of C3 N4(t-C3 N4)embedded with Fe304 nanospheres.t-C3 N4 exhibits high surface area and strong anchoring of LPS,and the Fe3 O4/t-C3 N4 accelerates the anchoring of LPS and improves the electronic pathways.The combination of these materials leads to remarkable battery performance with 400%improvement in a specific capacity and a low capacity decay per cycle of 0.02%at 2 C over 1000 cycles,and stable cycling at 6.4 mg cm-2 for high-sulfur-loading cathode.
