碳化细菌纤维素的理化性质及其在甲醇电催化中的应用

doi:10.11901/1005.3093.2020.219

材料研究学报

2021, Vol. 35

Issue (4): 259-270 DOI: 10.11901/1005.3093.2020.219

研究论文

本期目录 | 过刊浏览

碳化细菌纤维素的理化性质及其在甲醇电催化中的应用

唐开元¹, 黄洋²(

), 黄湘舟², 葛颖², 李娉婷², 袁凡舒¹, 张威威¹, 孙东平¹(

)

^1.南京理工大学化工学院南京 210094
^2.南京林业大学理学院南京 210037

Physicochemical Properties of Carbonized Bacterial Cellulose and Its Application in Methanol Electrocatalysis

TANG Kaiyuan¹, HUANG Yang²(

), HUANG Xiangzhou², GE Ying², LI Pinting², YUAN Fanshu¹, ZHANG Weiwei¹, SUN Dongping¹(

)

^1.School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
^2.School of Science, Nanjing Forestry University, Nanjing 210037, China

引用本文:

唐开元, 黄洋, 黄湘舟, 葛颖, 李娉婷, 袁凡舒, 张威威, 孙东平. 碳化细菌纤维素的理化性质及其在甲醇电催化中的应用[J]. 材料研究学报, 2021, 35(4): 259-270.
Kaiyuan TANG, Yang HUANG, Xiangzhou HUANG, Ying GE, Pinting LI, Fanshu YUAN, Weiwei ZHANG, Dongping SUN. Physicochemical Properties of Carbonized Bacterial Cellulose and Its Application in Methanol Electrocatalysis[J]. Chinese Journal of Materials Research, 2021, 35(4): 259-270.

全文: PDF(6561 KB) HTML

摘要:

对在实验室发酵制备的细菌纳米纤维素(BC)分别进行烘箱干燥和冷冻干燥,然后对其高温碳化，系统地研究了碳化细菌纤维素(CBC)的微观形貌、元素组成以及晶体结构等理化性质随碳化温度的变化。结果表明，烘箱干燥的BC失去了纳米纤维结构，而冷冻干燥可防止纳米纤维堆叠而使其保持三维结构。还以CBC碳纳米纤维为导电载体负载金属Pt制备CBC基复合材料并将其用于甲醇电催化，研究了CBC基复合材料的电化学性能与其微纳结构和化学组成之间的内在联系。

关键词 ：有机高分子材料, 碳化细菌纤维素, 理化性质, 甲醇电催化

Abstract：

The bacterial cellulose (BC) cultured and purified in the laboratory were oven-dried and freeze-dried respectively and then was carbonized at high temperature. The results show that the oven-dried BC lost the nanofiber structure, and the freeze-drying technology could prevents the nanofibers from stacking and keeps the BC three-dimensional structure. The physicochemical properties such as micromorphology, elemental composition, crystal structure of the carbonized bacterial cellulose (CBC) and thier evolution process with carbonization temperature were systematically investigated. Through Pt-deposition on the conductive carrier of CBC carbon nanofibers, thus an electrode of composite materials could be acquired, which then were used for methanol electrocatalysis. Finally the relationship between the electrochemical performance of CBC-based composite materials and its micro-nano structure and chemical composition was highlighted.

Key words： organic polymer materials carbonized bacterial cellulose physicochemical properties methanol electrocatalysis internal relationship

收稿日期: 2020-06-07

ZTFLH:

TQ352.4

基金资助:国家自然科学基金(51702162)

作者简介: 唐开元，男，1998年生，硕士生

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	唐开元
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	黄湘舟
	葛颖
	李娉婷
	袁凡舒
	张威威
	孙东平
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https://www.cjmr.org/CN/10.11901/1005.3093.2020.219 或 https://www.cjmr.org/CN/Y2021/V35/I4/259

图1 冷冻干燥后的BC气凝胶，BC碳化所得CBC材料以及压平后BC碳化所得CBC材料的SEM照片

图2 水凝胶态BC分散后、冷冻干燥BC碳化所得CBC以及用鼓风烘箱干燥并碳化的CBC的TEM照片

图3 BC的TGA曲线

图4 BC和CBC样品的XRD衍射图

图5 CBC样品的N2等温吸附/脱附曲线及其孔径分布

表1 CBC样品的比表面积和孔道结构

图6 CBC-800-P材料的孔径分布

图7 CBC样品的拉曼光谱

表2 各种CBC样品的D峰半高宽和ID/IG

图8 在600~1000℃碳化所得CBC材料的电导性能

图9 在600、800 和1000℃碳化所得CBC样品和市售CNTs的HRTEM照片

图10 在600~1000℃碳化后CBC材料的XPS全谱和C 1s分峰图

表3 在600~1000℃碳化所得CBC材料的O/C原子比值以及各峰的结合能(括号内为各峰和C-C峰的面积之比)

图11 Pt-CBC-800和Pt-Vulcan的TEM照片以及Gatan Digital Micrograph软件测出的晶格间距

图12 Pt-CBC复合材料和Pt-Vulcan的XRD谱

图13 Pt-CBC复合材料和Pt-Vulcan在0.5 mol/L H2SO4以及0.5 mol/L H2SO4+1.0 mol/L CH3OH溶液中的CV曲线

表4 各种催化材料样品的CV数据

图14 Pt-CBC样品在0.5 mol/L H2SO4+1.0 mol/L CH3OH混合溶液中的计时电流曲线

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