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
The application of electrocatalysts for the oxygen reduction reaction(ORR) is vital in a variety of energy conversion technologies. Exploring low-cost ORR catalysts with high activity and long-term stability is highly...The application of electrocatalysts for the oxygen reduction reaction(ORR) is vital in a variety of energy conversion technologies. Exploring low-cost ORR catalysts with high activity and long-term stability is highly desirable, although it still remains challenging. Herein, we report a facile and reliable route to convert ZIF-8 modified by Fe-phenanthroline into Fe-incorporated and N-doped carbon dodecahedron nanoarchitecture(Fe-NCDNA), in which carbon nanosheets are formed in situ as the building blocks with uniform Fe-N-C species decoration. Systematic electrochemical studies demonstrate that the as-synthesized Fe-NCDNA electrocatalyst possesses highly attractive catalytic features toward the ORR in terms of activity and durability in both alkaline and neutral media. The Zn-air battery with the optimal Fe-NCDNA catalyst as the cathode performs impressively, delivering a power density of 184 m W cm^–2 and a specific capacity of 801 m Ah g^–1;thus, it exhibits great competitive advantages over those of the Zn-air devices employing a Pt-based cathode electrocatalyst.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。
文摘The application of electrocatalysts for the oxygen reduction reaction(ORR) is vital in a variety of energy conversion technologies. Exploring low-cost ORR catalysts with high activity and long-term stability is highly desirable, although it still remains challenging. Herein, we report a facile and reliable route to convert ZIF-8 modified by Fe-phenanthroline into Fe-incorporated and N-doped carbon dodecahedron nanoarchitecture(Fe-NCDNA), in which carbon nanosheets are formed in situ as the building blocks with uniform Fe-N-C species decoration. Systematic electrochemical studies demonstrate that the as-synthesized Fe-NCDNA electrocatalyst possesses highly attractive catalytic features toward the ORR in terms of activity and durability in both alkaline and neutral media. The Zn-air battery with the optimal Fe-NCDNA catalyst as the cathode performs impressively, delivering a power density of 184 m W cm^–2 and a specific capacity of 801 m Ah g^–1;thus, it exhibits great competitive advantages over those of the Zn-air devices employing a Pt-based cathode electrocatalyst.
