以蓝藻为原料,经水热活化和高温退火处理,制备了一系列氮磷共掺杂多孔碳(NPC)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮气吸脱附(BET)对NPC的形貌与结构进行表征;通过X射线光电子能谱和元素分析(XPS)确定氮和磷的原子百分数分别为5.47%和0.24%。将NPC用作超级电容器的电极材料时,其比容量在1A/g时达到568.7F/g。用作氧还原反应(ORR)的催化剂时,在KOH溶液中起始电位为0.92V,半波电位0.80V,循环48h电流保持率高达97%,因此无论是在能源存储(超级电容器),还是在能源转化(电催化ORR)方面均具有优异的性能。该制备工艺简单,并能将对环境有害的生物质转化为具有高附加值的催化剂,实现生物质的高值化利用,具有非常好的应用前景。
A series of nitrogen and phosphorus co-doped porous carbon (NPC) was prepared from cyanobacteria by hydrothermal activation and high-temperature annealing.The morphology and structure of NPC were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM) and nitrogen adsorption and desorption (BET).The atomic percentages of nitrogen and phosphorus were determined by X-ray photoelectron spectroscopy and elemental analysis (XPS) to be 5.47% and 0.24%,respectively.When NPC was used as electrode material of supercapacitor,its specific capacity reached 568.7F·g-1 at the current of 1A·g-1.While it was used as a catalyst for oxygen reduction reaction (ORR),the onset potential in KOH solution was 0.92V,the half-wave potential was 0.80V,and the current retention rate was as high as 97% during 48 h cycle.Therefore,it exhibited excellent performance in both energy storage (supercapacitor) and energy conversion (electrocatalytic ORR).The preparation process was simple,and could convert environmentally harmful biomass into a catalyst with high added value,and realized high value utilization of biomass,showing a very good application prospect.
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基金资助
国家自然科学基金(81900814);浙江省重点研发计划项目(2020C03003)
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