基于固废微波快速制备泡沫碳负载CoO_(x)纳米片及电催化析氧性能  

Rapid Synthesis of 3D Carbon Foam Supported CoO_(x) Nanosheets by Microwave Selective Heating Based on Solid waste and their electrocatalytic performance for oxygen evolution reactions

作　　者：张青原 龙威宇 崔玉琛 徐磊 孟祥康[1] 唐少春 ZHANG Qingyuan;LONG Weiyu;CUI Yuchen;XU Lei;MENG Xiangkang;TANG Shaochun(National Laboratory of Solid State Microstructures,Jiangsu Key Laboratory of Artificial Functional Materials,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China;Institute of Agricultural Facilities and Equipment,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;Key Haian Institute of High-Tech Research,Nanjing University,Haian 226600,China)

机构地区：[1]南京大学现代工程与应用科学学院固体微结构物理国家重点实验室江苏省功能材料设计原理与应用技术重点实验室,南京210093 [2]江苏省农业科学研究院农业设施与设备研究所,南京210014 [3]海安南京大学高新技术研究院,江苏海安226600

出　　处：《功能材料》2023年第8期8148-8156,共9页Journal of Functional Materials

基　　金：江苏省重点研发计划项目(BE2020684);江苏省碳达峰碳中和科技创新专项资金项目(BE2022332)。

摘　　要：开发性能稳定、成本低廉的电催化剂对于电催化水分解实现大规模制氢至关重要。以固体废弃物三聚氰胺泡沫为原料,采用微波选择性加热的方法在碳化后的三维氮掺杂碳骨架上快速生长均匀分布的CoO_(x)纳米片多孔包覆层(CoO_(x)/N-C)。微波反应过程仅需45 s,反应速率比传统化学沉淀—热解法(制备时间6-8 h)提高了两个数量级。电化学测试结果表明,当电流密度为10 mA cm^(-2)时,CoO_(x)/N-C电极在1M KOH电解液中过电位仅为340 mV;经过10 h循环测试,其电催化性能保持率高达97%。这主要归因于三维氮掺杂碳作为电子传输通道有效地提高了CoO_(x)的导电性,且CoO_(x)纳米片多孔层为电催化析氧反应(OER)提供了足够多的活性位点。研究为快速制备高性能OER电催化材料提供了一种新方法,为固体废弃物高价值再利用提供了一种有效途径。It is of great significance to design and develop both highly active and low-cost electrocatalysts toward large-scale hydrogen production via electrocatalytic decomposition of water.Herein,using solid waste of melamine foams as raw material,CoO_(x) nanosheet-built porous coating(CoO_(x)/N-C)with uniform distribution grew on the ligaments of three-dimensional(3D)nitrogen-doped carbon framework by microwave selective heating.The microwave reaction time is only 45 seconds and thus the reaction rate is two orders of magnitude higher than that of traditional chemical precipitation-pyrolysis technique(about 6-8 h).When the current density is 10 mA/cm^(2),the over-potential of the CoO_(x)/N-C electrode in 1 M KOH electrolyte is only 340 mV.After the stability tests for 10 h,its electrocatalytic performance retention is up to 97%.This is mainly attributed to the fact that the 3D nitrogen-doped carbon skeleton can effectively improve the electrical conductivity of CoO_(x) as an electron transfer bridge,and the porous CoO_(x) nanosheet layer provides enough active sites for oxygen evolution reaction(OER).This study provides a new route to the rapid preparation of high-performance OER electrocatalysts based on solid wastes.

关 键 词：氮掺杂泡沫碳 CoO_(x)纳米片 微波加热 析氧反应 电催化 

分 类 号：O643[理学—物理化学]