载钯细菌纤维素纳米纤维复合膜用于乙醇的电催化氧化

doi:10.11901/1005.3093.2016.793

材料研究学报

2018, Vol. 32

Issue (2): 155-160 DOI: 10.11901/1005.3093.2016.793

研究论文

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载钯细菌纤维素纳米纤维复合膜用于乙醇的电催化氧化

敖克龙, 李大伟, 姚壹鑫, 吕鹏飞, 魏取福(

)

江南大学生态纺织教育部重点实验室无锡 214122

Electro-catalytic Activity of Composite Films of Pd-doped Bacterial Cellulose Nano-fibers for Ethanol Oxidation

Kelong AO, Dawei LI, Yixin YAO, Pengfei LV, Qufu WEI(

)

Key Laboratory of Eco-textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China

引用本文:

敖克龙, 李大伟, 姚壹鑫, 吕鹏飞, 魏取福. 载钯细菌纤维素纳米纤维复合膜用于乙醇的电催化氧化[J]. 材料研究学报, 2018, 32(2): 155-160.
Kelong AO, Dawei LI, Yixin YAO, Pengfei LV, Qufu WEI. Electro-catalytic Activity of Composite Films of Pd-doped Bacterial Cellulose Nano-fibers for Ethanol Oxidation[J]. Chinese Journal of Materials Research, 2018, 32(2): 155-160.

全文: PDF(2743 KB) HTML

摘要:

以发酵合成的细菌纤维素(BC)为载体支架,用一步化学还原法在BC上直接生长钯纳米颗粒(Pd NPs),制备出载钯细菌纤维素纳米纤维复合膜(Pd/BCF)。X射线衍射(XRD)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)等测试结果表明,Pd NPs比较均匀地分散在纤维表面及介孔中,粒径约为10 nm,载量约为19.0%。电化学测试如循环伏安(CV)、电化学阻抗谱(EIS)、计时电流(CA)、计时电位曲线(CP)等的测试结果表明,与传统的碳材料载体和Pt催化剂相比,Pd/BCF对碱性介质中乙醇电催化氧化的活性显著提高,且在反应中的抗中毒能力较强。

关键词 ：复合材料, 燃料电池, 乙醇, 电催化, 细菌纤维素, 钯

Abstract：

Bacterial cellulose nanofibers (BCFs) were synthesized by fermentation process and then with the prepared BCFs as carrier material, composite films of Pd-doped bacterial cellulose nanofibers (Pd/BCF) were prepared by depositing nano-particles of Pd (Pd-NPs) on the carrier via chemical reduction process. The prepared Pd-doped BCFs and composite films Pd/BCF were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), electrochemical impedance spectra (EIS), chronoamperometry (CA), and chronopotentiometry (CP). The results show that Pd-NPs were well dispersed on BCFs and especially in the mesoporous of BCFs. The composite films contain c.a. 19% (mass fraction) of Pd-NPs with a mean particle size c.a. 10 nm. The composite of Pd/BCF had better catalytic activity in contrast to the traditional carbon carrier material and Pt-catalyst. Besides, the composite of Pd/BCF exhibited relatively high poison tolerance during the ethanol oxidation process.

Key words： composite fuel cell ethanol electro-catalytic bacterial cellulose palladium

收稿日期: 2016-12-30

ZTFLH:

TM9114

基金资助:江苏省自然科学基金(BK20150155),江苏省六大高峰人才项目(2014-XCL001),中央高校基本科研业务费专项资金(JUSRP51505,JUSRP115A04, JUSRP51621A),江苏高校优势学科建设工程(PAPD)

作者简介:

作者简介敖克龙,男,1993年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.793 或 https://www.cjmr.org/CN/Y2018/V32/I2/155

图1 Pd/BCF的SEM照片(插图为Pd/BCF的HR-SEM图)、Pd/BCF的TEM照片以及Pd/BCF中Pd NPs的粒径分布直方图

图2 Pd/BCF的XRD图谱

图3 各修饰电极的EIS测试图

图4 不同修饰电极在1 mol/L NaOH溶液时的循环伏安曲线

图5 乙醇在不同修饰电极上的电氧化循环伏安曲线

表1 几种不同催化剂上乙醇的电氧化性能比较

图6 不同修饰电极的计时电流曲线

图7 乙醇在不同修饰电极上的电氧化计时电位曲线

图8 乙醇在Pd/BCF电极上的电催化氧化机理图

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