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- 2019
Co-Mn掺杂碳气凝胶的制备与性能
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Abstract:
为探究不同碳化温度对Co-Mn掺杂碳气凝胶（Co-Mn/CA）电催化析氢性能的影响，以资源丰富且可再生的木质纤维素为碳源、四水乙酸钴为钴源、四水乙酸锰为Mn源，通过水热法制备出Co-Mn/CA。研究发现，纤维素气凝胶碳化后表面形貌发生改变，由片层结构转变为多孔结构，使其活性位点数量增多，电催化析氢活性增加。通过XRD和N2吸-脱附对其结构进行了表征处理分析，结果表明，经碳化处理后的CA产物以无定型碳为主，经900℃碳化处理后的CA（CA-900）比表面积和总孔隙体积均为最大，分别为958 m2g-1和0.33 cm3·g-1。电化学性能测试表明，Co-Mn/CA-900表现出最好的电催化析氢反应（HER）催化活性，在1 mol/L KOH电解液中、50 mA·cm-2的电流密度下，具有175 mV的过电势，经过10 h的计时电位测试，压降仅为7%，表现出较好的电催化析氢稳定性。 In order to investigate the effects of the different carbonization temperatures on the electrocatalytic hydrogen evolution properties of the Co-Mn-doped carbon aerogel (Co-Mn/CA), the Co-Mn/CA was prepared by hydrothermal method using resource-rich and renewable lignocellulose as a carbon source, cobalt acetate tetrahydrate as a cobalt source, and manganese acetate tetrahydrate as a manganese source. The results reveal that after carbonization, the surface morphology of the cellulose aerogel changes from a laminated structure to a porous structure, which increases the active sites and electrocatalytic hydrogen evolution activity. After characterizing the structure by XRD and N2 adsorption and desorption, it shows that CA product after carbonization is almost amorphous carbon and the CA after carbonization at 900℃(CA-900) has the largest specific surface area and total pore volume of 958 m2·g-1 and 0.33 cm3g-1, respectively. The electrochemical performance tests show that the Co-Mn/CA-900 has the best electrocatalyst hydrogen evolution reaction (HER) activity. In 1 mol/L KOH electrolyte, it has an overpotential of 175 mV at a current density of 50 mA·cm-2 and the pressure drop is only 7% after chronopotential test for 10 h, which indicates superior electrocatalytic hydrogen evolution stability. 国家自然科学基金（31470580
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