摘要
采用模板复型辅助的化学气相沉积法(CVD)成功制备出一种非贵金属的氧还原反应(ORR)催化剂材料—包裹碳化钨纳米粒子的石墨化介孔碳(WC/MG)复合物。制备的介孔结构WC/MG复合材料不仅具有高氧还原反应电化学催化活性,还表现出良好的电化学稳定性。在O_2饱和的0.1 mol/L KOH电解质溶液中,900℃制备的样品WC/MG-900其半波电势(E1/2)和极限电流密度仅比商用贵金属催化剂Pt/C分别低50 mV和0.2 mA/cm^2。KouteckyLevich曲线和旋转环盘电极实验均表明,该介孔结构的WC/MG复合材料表现出近似4电子的ORR反应途径,具有可与Pt/C催化剂相比拟的ORR催化活性,以及比Pt/C更优越的电化学稳定性和耐甲醇性能,使得该介孔结构WC/MG复合物在氧还原电极材料中表现出良好的应用前景。
Tungsten carbide nanoparticle-encased graphite-like mesoporous carbon （WC/MG）, as a precious metal-free cathode catalyst for oxygen reduction reaction, was successfully synthesized by a template replicating-assisted chemical vapor deposition （CVD） method. The obtained mesostructured WC/MG composite possesses high oxygen reduction reaction catalytic activity and stable electrochemical property. In O2-staturated 0.1 mol/L KOH solution, the half-wave potential （E1/2） and limiting current density of the sample WC/MG-900 annealed at 900℃ were only 50 mV and 0.2 mA/cm2 lower than those of commercial Pt/C catalyst, respectively. Koutecky-Levich （K-L） plots and rotating ring-disk electrode （RDE） measurements indicated that the mesostructured WC/MG exhibited an approximate 4 e- transfer pathway during the ORR process. The comparable ORR performance to Pt/C, long-lived electrochemical stability and excellent methanol tolerance make the synthesized mesostructured WC/MG composite a potential electrode catalyst in oxygen reduction reaction.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2018年第2期213-220,共8页
Journal of Inorganic Materials
基金
国家重大科技基础研究发展计划(973)(2013CB933200)
上海市自然科学基金(16ZR1440600)
关键词
碳化钨
石墨化
介孔
氧还原反应
tungsten carbide
graphitization
mesoporous
ORR
