生物炭辅助水电解制氢的特性

doi:10.16085/j.issn.1000-6613.2021-0062

化工进展 ›› 2021, Vol. 40 ›› Issue (9): 4823-4829.DOI: 10.16085/j.issn.1000-6613.2021-0062

生物炭辅助水电解制氢的特性

耿震(), 应芝(), 郑晓园, 高立, 杨景洋, 豆斌林

上海理工大学能源与动力工程学院，上海市动力工程多相流动与传热重点实验室，上海 200093

收稿日期:2021-01-10 修回日期:2021-03-22 出版日期:2021-09-05 发布日期:2021-09-13
通讯作者: 应芝
作者简介:耿震（1992—），男，硕士研究生，研究方向为氢能开发及利用。E-mail：763409784@qq.com。
基金资助:
国家自然科学基金(51606128);上海市教育发展基金会和上海市教育委员会“晨光计划”(18CG51);上海市地方高校能力建设项目(18060502600)

Characteristics of biochar-assisted water electrolysis for hydrogen production

GENG Zhen(), YING Zhi(), ZHENG Xiaoyuan, GAO Li, YANG Jingyang, DOU Binlin

Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Received:2021-01-10 Revised:2021-03-22 Online:2021-09-05 Published:2021-09-13
Contact: YING Zhi

摘要/Abstract

摘要：

利用H型电化学池，在低温下研究稻壳水热生物炭（HB）和热解生物炭（PB）辅助水电解制氢的特性，采用电化学工作站对炭浆液进行LSV、EIS以及产氢特性测试，并结合XPS、FTIR、BET、XRD和SEM表征，分析两种生物炭的电化学反应特性，并探讨了生物炭理化性能对其氧化过程的影响规律。结果表明：HB中丰富的—OH基团使得阳极起始电位非常低，而PB有良好的孔隙结构和高比表面积，因此在较高阳极电位（>1.2V vs. MSE）下的反应活性较强；生物炭浆液的溶液电阻和电荷传递电阻随着反应温度的升高而减小；生物炭氧化反应活化能随着阳极电位的增高呈下降趋势；硅酸盐成分对生物炭氧化有一定阻碍作用，PB酸洗后表面官能团暴露有利于其氧化且使电流密度增大，但酸洗会清除HB中易氧化基团，导致其电流密度下降；相同条件下PB较HB的产氢率更高。

关键词: 制氢, 热解, 水热, 电化学, 生物质

Abstract:

The characteristics of rice husk hydrothermal biochar (HB) and pyrolytic biochar (PB) assisted water electrolysis for hydrogen production were studied at low temperature using H-type electrochemical cell. LSV, EIS and hydrogen production of the biochar slurry were tested by electrochemical workstation, and the electrochemical reaction characteristics of the two kinds of biochar were analyzed through XPS, FTIR, BET, XRD and SEM. The influence of physicochemical properties of biochar on its oxidation process was discussed. Results indicated that the onset potential of HB was very low due to the abundance of—OH groups, while PB showed a strong reactivity at a higher anode potential (>1.2V vs. MSE) due to its rich pore structure and high specific surface area. The solution resistance and charge transfer resistance of the biochar slurries decreased with the increase of reaction temperature. The activation energy of biochar oxidation decreased with the increase of anode potential. The silicate in biochar had inhibition effect on its electrochemical reaction. The current density increased due to the exposure of the surface functional groups of PB after pickling, while the current density decreased due to the removal of the easily oxidized radicals in HB by pickling. Under the same conditions, the hydrogen production rate of PB was higher than that of HB.

Key words: hydrogen production, pyrolysis, hydrothermal, electrochemistry, biomass

中图分类号:

TK91

耿震, 应芝, 郑晓园, 高立, 杨景洋, 豆斌林. 生物炭辅助水电解制氢的特性[J]. 化工进展, 2021, 40(9): 4823-4829.

GENG Zhen, YING Zhi, ZHENG Xiaoyuan, GAO Li, YANG Jingyang, DOU Binlin. Characteristics of biochar-assisted water electrolysis for hydrogen production[J]. Chemical Industry and Engineering Progress, 2021, 40(9): 4823-4829.

图/表 9

图1 生物炭的C1s分谱图

表1 C1s结合态及原子相对百分比

键能/eV	结构	相对百分比/%
键能/eV	结构	HB	PB
284.6	C—（C，H）；C=C	48.14	72.12
286.1	C—（O，N）	33.23	6.78
287.9	C=O；O—C—O	18.63	8.11
292.6	O—C=O	—	12.99

图2 生物炭的FTIR光谱图和XRD图

图3 HB与PB的SEM图像

图4 不同阳极原料的LSV曲线

图5 生物炭的EIS特性

图6 电位对活化能的影响

图7 酸洗对阳极反应特性的影响

图8 在30℃、2V条件下生物炭辅助水电解的产氢特性

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生物炭辅助水电解制氢的特性

Characteristics of biochar-assisted water electrolysis for hydrogen production

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