氮/磷共掺杂生物质基氧还原催化剂的制备与阴极性能研究

Preparation and cathode performance of nitrogen and phosphorus dual-doped carbon derived biomass

文章以废弃物榴莲壳作为原料,以(NH4)3PO4·3H2O作为掺杂源,同时引入N和P两种非金属元素,制备了N/P共掺杂氧还原催化剂。实验结果表明,当煅烧温度为900℃时,所得催化剂NPDC-900具有大量的介孔结构,比表面积可达到1 264 m^(2)/g,预测该催化剂具有较高的活性位点利用率和优异的传质效率。中性环境中的氧还原反应(ORR)测试表明,NPDC-900的半波电位为0.554 V,极限电流为5.91 mA/cm^(2),起始电位为0.988 V,与商业Pt/C的性能相近。此外,NPDC-900的电子转移数接近于4,ORR过程属于四电子转移途径。计时电流法测试表明,NPDC-900具有比Pt/C更优异的长期稳定性,在运行12 000 s后,仍能保持其初始电流密度的96%。将NPDC-900应用于微生物燃料电池(MFC)时,MFC的最大功率密度为560.27±13 mW/m^(2),最大启动电压为0.40 V,使用效果与商业Pt/C相接近。

In this paper,durian shell based porous catalyst was prepared by incorporating N and P into it using dopant(NH4)3 PO4·3 H2 O.The experimental results showed that NPDC-900 possessed mesoporous structure and the specific surface area(1 264 m^(2)/g),which increased the active site and improved mass transfer capacity.The ORR test of NPDC-900 displayed best ORR performance with a half-wave potential of 0.554 V,limit current of 5.91 mA/cm^(2),and onset potential of 0.988 V.Basing on RRDE test,it was confirmed a 4e^(-) pathway towards ORR for NPDC-900.Besides,NPDC-900 exhibited excellent long-term stability than Pt/C,after running for 12 000 s,it can still maintain 96% of its initial current density.Especially,when used in microbial fuel cell,its maximum power density was 560.27±13 mW/m^(2) and the start-up voltage was0.40 V,which was similar to commercial Pt/C.