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林产化学与工业 ›› 2021, Vol. 41 ›› Issue (6): 27-35.doi: 10.3969/j.issn.0253-2417.2021.06.004

• 重点研发专栏 • 上一篇    下一篇

木质素制备燃料电池阴极电催化炭材料研究(Ⅳ)——材料的制备及其催化氧气还原性能

金凯楠1, 左宋林1,*(), 桂有才1, 申保收2,3,*(), 王珊珊1, 崔难难1   

  1. 1. 南京林业大学 化学工程学院, 江苏 南京 210037
    2. 陕西省地表系统与环境承载力重点实验室, 陕西 西安 710127
    3. 西北大学 城市与环境学院/地表系统与灾害研究院, 陕西 西安 710127
  • 收稿日期:2021-07-14 出版日期:2021-12-28 发布日期:2021-12-31
  • 通讯作者: 左宋林,申保收 E-mail:zslnl@njfu.edu.cn;bsshen@nwu.edu.cn
  • 作者简介:申保收, 副教授, 硕士生导师, 研究领域为环境及储能材料与环境水化学, E-mail: bsshen@nwu.edu.cn
    左宋林, 教授, 博士生导师, 研究领域为生物质热化学转化与炭材料, E-mail: zslnl@njfu.edu.cn
    金凯楠(1996-), 男, 江苏南京人, 硕士生, 从事木质素的改性与应用研究
  • 基金资助:
    国家重点研发计划资助项目(2019YFB1503804);江苏省自然科学基金青年项目(BK20170928)

Studies on Lignin-based Carbon Materials as Electrocatalysts of Fuel Cells Cathode Ⅳ: Preparation and Electrocatalytic Properties for Oxygen Reduction Reaction

Kainan JIN1, Songlin ZUO1,*(), Youcai GUI1, Baoshou SHEN2,3,*(), Shanshan WANG1, Nannan CUI1   

  1. 1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
    2. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi'an 710127, China
    3. College of Urban and Environmental Sciences/Institute of Earth Surface System and Hazards, Northwest University, Xi'an 710127, China
  • Received:2021-07-14 Online:2021-12-28 Published:2021-12-31
  • Contact: Songlin ZUO,Baoshou SHEN E-mail:zslnl@njfu.edu.cn;bsshen@nwu.edu.cn

摘要:

在对酶解木质素以及尿素、三聚氰胺改性木质素的热解过程、木质素基炭的化学结构和微观结构等系列研究基础上,采用木质素改性、炭化和氨气活化等过程制备了木质素基活性炭,运用氮气吸附法、傅里叶变换红外光谱、X射线光电子能谱和电化学等方法分析了木质素基活性炭的孔隙结构、表面化学结构与电催化氧气还原反应(ORR)的催化性能。研究结果表明:以酶解木质素为原料,通过含氮化合物改性、炭化和高温氨气活化能够制备出ORR电催化性能优良的木质素基活性炭。采用含氮化合物改性和氨气活化的方法,可以有效调控木质素基活性炭的孔隙结构,以及吡啶氮(N-6)、吡咯氮(N-5)和季氮(N-Q)等含氮基团含量,从而达到调控木质素基活性炭的ORR电催化性能的目的。木质素经三聚氰胺改性、800 ℃炭化、950 ℃氨气活化制得的活性炭L-M-800-NH3-950比表面积为1 304 m2/g,微孔(0.438 cm3/g)和中孔(0.302 cm3/g)结构发达,含氮量为6.82%,季氮基团为64.8%,电催化性能与商业20% Pt/C材料接近。

关键词: 木质素, 活性炭, 电催化, 氧气还原, 三聚氰胺

Abstract:

Lignin-based activated carbons were prepared by the consecutive procedure of lignin modification, carbonization and ammonia activation using enzymatic hydrolysis lignin as starting material, in terms of our serial investigations that have been conducted on pyrolysis of starting materials, surface chemistry and microstructure of lignin-derived chars. Nitrogen adsorption, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and electronic chemistry methods were employed to characterize the pore structure and surface chemistry of lignin-based activated carbons and to evaluate the catalytic performance as electrocatalysts for oxygen reduction reaction(ORR). The results showed that lignin-based activated carbons with good performance of electronically catalyzing ORR could be obtained through nitrogen-containing chemicals modification of enzymatic hydrolysis lignin followed by carbonization and ammonia activation. By combing the method of lignin modification with nitrogen-containing substances and ammonia activation, the pore structure and the concentration of nitrogen-containing groups including pyridine-like, pyrrole-like and quaternary-like species could be tuned and, as a result, benefit to regulate the electrocatalytic properties of lignin-based activated carbons. Using melamine-modified enzymatic hydrolysis lignin as starting material produced the lignin-based activated carbons with a comparable electrocatalytic performance with commercially available 20% Pt/C catalyst, which possess a surface areas of more than 1 300 m2/g, developed microporosity and mesoporisty, a nitrogen content of more than 6% and a high concentration of quaternary-like groups.

Key words: lignin, activated carbon, electrocatalysis, oxygen reduction reaction, melamine

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