木质素碳基催化剂的制备及电解水性能  

Preparation of lignin-derived carbon-based catalyst and its electrocatalytic performance for water splitting

作　　者：张蒂 陈彬剑[1] 李国宁 ZHANG Di;CHEN Binjian;LI Guoning(School of Thermal Engineering,Shandong Jianzhu University,Ji′nan 250101,China)

机构地区：[1]山东建筑大学热能工程学院,山东济南250101

出　　处：《化工科技》2025年第1期41-47,共7页Science & Technology in Chemical Industry

基　　金：山东省自然科学基金项目(ZR2021QB185)。

摘　　要：电解水制氢是获得绿氢的重要方式,是助力实现“双碳”目标的重要技术,而电催化剂对于制氢成本至关重要。木质素作为储量极为丰富的生物质资源,却未得到有效利用,绝大部分作为低值燃料使用,甚至作为固体废弃物处置,造成碳资源浪费和环境污染。以木质素为碳前驱体、醋酸锌为改性剂,通过便捷的两步共热解法制备了木质素碳基催化剂,探究了热解温度对碳材料微观结构和化学组成的影响。结果表明,热解温度为900℃,醋酸锌改性的木质素碳材料具有高比表面积和以微-介孔为主层次多级孔结构,以此作为碳基体制备的碳基催化剂表现出优异的阳极析氧反应(OER)和阴极析氢反应(HER)活性,电流密度为10 mA/cm^(2)时过电位分别为314、242 mV。该研究为木质素高值化利用和低成本碳基催化剂制备提供了新思路。Hydrogen production via water electrolysis is a vital method for the production of green hydrogen,which plays a crucial role in achieving the"dual carbon"goal,and the electrocatalyst is crucial for the cost of hydrogen production.Lignin,as an extremely abundant biomass resource,has not been effectively utilized,most of which is used as low-value fuel or even disposed of as solid waste,resulting in the waste of carbon resources and environmental pollution.Hence,a lignin derived carbon-based metal electrocatalyst was prepared using lignin as the carbon precursor and zinc acetate as modifier through a facile two-step co-pyrolysis method.Specifically,the effects of pyrolysis temperature on the microscopic structure and chemical composition of lignin-derived carbon materials were investigated.The results demonstrate that the lignin-derived carbon material modified by zinc acetate at 900℃possesses a high specific surface area and hierarchical porous structure composed of micro and mesopore,and the as-obtained carbon-based electrocatalyst exhibits outstanding bifunctional activity for OER and HER,requiring only the overpotentials of 314 and 242 mV,respectively,at the current density of 10 mA/cm^(2).This study can provide new insights into the high-value utilization of lignin and the preparation of low-cost carbon-based catalysts.

关 键 词：木质素 生物质 多孔碳 电催化剂 电解水 

分 类 号：TK6[动力工程及工程热物理—生物能]