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Electrolysis of Glycerol by Non-Noble Metal Hydroxides and Oxides
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-04-26 , DOI: 10.1021/acsaem.3c00590 Jiali Zhang 1, 2 , Yi Shen 1, 2, 3 , Hongying Li 4
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-04-26 , DOI: 10.1021/acsaem.3c00590 Jiali Zhang 1, 2 , Yi Shen 1, 2, 3 , Hongying Li 4
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A series of free-standing electrodes consisting of hydroxides (Ni(OH)2, Co(OH), NiFeLDH, and CoFeLDH) and oxides (NiO, Co3O4, NiFe2O4, and CoFe2O4) supported by carbon paper were fabricated via an in situ hydrothermal process and further examined for glycerol conversion. The morphology and structures of the samples were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The performance of the samples was studied by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy. The products of glycerol oxidation were analyzed by high-performance liquid chromatography. Operando electrochemical Raman spectroscopy was employed to monitor the variations on the active sites and intermediates. Among the samples, the NiO exhibited superior activity with the largest current density of 0.8 mA cm–2 at 1.7 V and selectivity of 97% for formic acid. Furthermore, coupling the hydrogen evolution reaction with the glycerol electro-oxidation reaction (GOR), we explored the electrolysis of water and glycerol. The potential of the electrolysis process was negatively shifted from 1.68 to 1.28 V by replacing the oxygen evolution reaction with GOR. The strategy reported in this work could afford a sustainable approach to produce hydrogen and value-added chemicals with high energy efficiency.
中文翻译：
非贵金属氢氧化物和氧化物电解甘油
一系列由氢氧化物（Ni(OH) 2、Co(OH)、NiFeLDH 和 CoFeLDH）和氧化物（NiO、Co 3 O 4、NiFe 2 O 4和 CoFe 2 O 4）组成的独立电极) 由复写纸支撑，通过原位水热工艺制造，并进一步检查甘油转化率。通过扫描电子显微镜、透射电子显微镜和X射线衍射对样品的形貌和结构进行了表征。通过循环伏安法、线性扫描伏安法和电化学阻抗谱研究了样品的性能。甘油氧化产物用高效液相色谱法进行分析。Operando 电化学拉曼光谱用于监测活性位点和中间体的变化。在样品中，NiO 表现出优异的活性，最大电流密度为 0.8 mA cm –2在 1.7 V 和 97% 的甲酸选择性。此外，将析氢反应与甘油电氧化反应 (GOR) 相结合，我们探索了水和甘油的电解。通过用 GOR 代替析氧反应，电解过程的电位从 1.68 负移至 1.28 V。这项工作中报告的策略可以提供一种可持续的方法来生产具有高能效的氢和增值化学品。
更新日期：2023-04-26
中文翻译：
非贵金属氢氧化物和氧化物电解甘油
一系列由氢氧化物（Ni(OH) 2、Co(OH)、NiFeLDH 和 CoFeLDH）和氧化物（NiO、Co 3 O 4、NiFe 2 O 4和 CoFe 2 O 4）组成的独立电极) 由复写纸支撑，通过原位水热工艺制造，并进一步检查甘油转化率。通过扫描电子显微镜、透射电子显微镜和X射线衍射对样品的形貌和结构进行了表征。通过循环伏安法、线性扫描伏安法和电化学阻抗谱研究了样品的性能。甘油氧化产物用高效液相色谱法进行分析。Operando 电化学拉曼光谱用于监测活性位点和中间体的变化。在样品中，NiO 表现出优异的活性，最大电流密度为 0.8 mA cm –2在 1.7 V 和 97% 的甲酸选择性。此外，将析氢反应与甘油电氧化反应 (GOR) 相结合，我们探索了水和甘油的电解。通过用 GOR 代替析氧反应，电解过程的电位从 1.68 负移至 1.28 V。这项工作中报告的策略可以提供一种可持续的方法来生产具有高能效的氢和增值化学品。
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