高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (3): 20230463.doi: 10.7503/cjcu20230463

• 分析化学 • 上一篇    下一篇

用超声衰减谱测量层状双金属氢氧化物粒度分布的方法

张明峰, 吴博, 侯光昊, 周蕾(), 王学重   

  1. 北京石油化工学院新材料与化工学院, 恩泽生物质精细化工北京市重点实验室, 北京 102617
  • 收稿日期:2023-11-06 出版日期:2024-03-10 发布日期:2024-01-05
  • 通讯作者: 周蕾 E-mail:zhoulei2020@bipt.edu.cn
  • 基金资助:
    国家自然科学基金(52102208);北京石油化工学院交叉科研探索项目(BIPTCSF-002)

The Method of Measuring Particle Size Distribution of Layered Double Hydroxides(LDHs) Using Ultrasonic Attenuation Spectroscopy

ZHANG Mingfeng, WU Bo, HOU Guanghao, ZHOU Lei(), WANG Xuezhong   

  1. College of New Materials and Chemical Engineering,Beijing Key Laboratory of Enze Biomass and Fine Chemicals,Beijing Institute of Petrochemical Technology,Beijing 102617,China
  • Received:2023-11-06 Online:2024-03-10 Published:2024-01-05
  • Contact: ZHOU Lei E-mail:zhoulei2020@bipt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52102208);the Cross-Disciplinary Science Foundation from Beijing Institute of Petrochemical Technology, China(BIPTCSF-002)

摘要:

层状双金属氢氧化物(LDHs)作为一种性能优良的非贵金属电催化剂, 在提高析氧反应速率、 降低制氢成本等方面具备巨大优势, 其粒度大小直接影响催化活性位点的有效暴露面积和本征结构, 很大程度上决定了LDHs电催化析氧反应的活性时间和催化效率. 因此, 实现对LDHs粒度分布的在线检测对LDHs的合成控制与活性提升具有重要意义. 根据LDHs粒度小、 形貌特殊的特点, 本文建立了一种基于超声衰减谱在线测量其在悬浮体系中粒度分布(PSD)的方法, 该方法在LDHs粒度表征领域的应用尚属首次. 利用超声衰减谱法对LDHs悬浮体系粒度分布进行测量的最大难点是传统ECAH模型需要首先已知难以获得的体系分散相和连续相的物性参数. 本文采用主成分分析(PCA)结合误差反向传播(BP)神经网络建立了预测模型, 并引入遗传算法(GA)对模型进行优化, 解决了超声衰减谱法的难点, 通过CoFeAl-LDH悬浮体系进行了验证. 结果表明, PCA-GA-BP神经网络能有效对LDHs在悬浮体系中的粒度分布进行在线预测, 预测值与真实值的峰形重合度高, 峰高偏差小, 两者的均方误差MSE为0.1497, 模型拟合优度R2=0.9768, 说明该方法可作为在线测量LDHs粒度分布的有效方式.

关键词: 层状双金属氢氧化物, 超声衰减谱, 粒度分布在线检测, BP神经网络, 遗传算法

Abstract:

Layered double hydroxides(LDHs), as a high-performance non-precious metal electrocatalyst, possess remarkable advantages in enhancing the oxygen evolution rate and reducing hydrogen production costs. The particle size of LDHs directly impacts the effective exposed surface area and intrinsic structure of catalytically active sites, thereby significantly influencing the activity duration and catalytic efficiency of LDHs in the electrocatalytic oxygen evolution reaction. Consequently, achieving online detection of LDHs particle size distribution holds significant importance for controlling LDHs synthesis and enhancing their catalytic activity. Based on the unique characteristics of LDHs, such as small particle size and distinctive morphology, this study introduces a novel approach for online measurement of particle size distribution(PSD) in LDHs suspensions via ultrasonic attenuation spectroscopy, marking the first-time application of this method in the field of LDHs particle characterization. The principal challenge in measuring the PSD of LDHs suspensions using ultrasonic attenuation spectroscopy lies in the requirement of system-specific properties for both the dispersed and continuous phases, which are often elusive to acquire. To address this challenge, this research utilizes principal component analysis(PCA) in conjunction with error backpropagation(BP) neural networks to establish a predictive model. Additionally, by incorporating genetic algorithm(GA) for model optimization, the challenges associated with ultrasonic attenuation spectroscopy are successfully addressed. The model is validated using a CoFeAl-LDHs suspension system. The results demonstrate the effectiveness of the PCA-GA-BP neural network in the online prediction of LDHs particle size distribution within the suspension system. The predicted values exhibit a high degree of resemblance to the true values in terms of peak shape, displaying minimal deviation in peak height. The mean squared error(MSE) between the predicted and true values is calculated as 0.1497, and the model fitting coefficient R2 stands at 0.9768, thus indicating the efficacy of this method as an accurate approach for online measurement of LDHs particle size distribution.

Key words: Layered double hydroxides(LDHs), Ultrasonic attenuation spectrum, Online detection of particle size distribution, bp Neural network, Genetic algorithm

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