摘要
分别以三聚氰胺、尿素、碳酸胍和硫脲为原料,通过热解法制备了碳化氮(CN)材料.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和氮气吸附-脱附测试对其进行了详细表征.将由该材料制备的电极作为阴极,铂片作为对电极,在酸性溶液中电催化选择性还原Sn(Ⅳ).与铜片、石墨板、钌铱钛板等常见阴极电极材料相比,CN不仅在双电极电解池中具有较低的电势,且在酸性溶液中稳定,可以实现将Sn(Ⅳ)选择性还原为Sn(Ⅱ).
Abstract
Graphitic carbon nitride(CN)-based materials were synthesized using melamine,urea,guanidine carbon-ate,and thiourea as precursors via pyrolysis.The synthesized materials underwent comprehensive characterization employing techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and nitrogen adsorption-desorption test.These materials were evaluated for their performance as cathodes with platinum sheet electrodes as anodes in the selective electrocatalytic reduction of Sn(Ⅳ)in an acid solution.During the reduction of Sn(Ⅳ)to Sn(Ⅱ),Sn(Ⅱ)can also be reduced to Sn due to the similar reduction poten-tials of Sn(Ⅱ)and Sn(Ⅳ).The deposition of Sn on the cathode diminishes the electrode conductivity efficiency.There-fore,the electrode material must fulfill the dual requirements of reducing Sn(Ⅳ)to Sn(Ⅱ)while preventing the reduc-tion of Sn(Ⅱ)to Sn.In comparison to conventional cathode materials such as copper plates,graphite plates,rutheni-um iridium titanium plates,and platinum plates,the CN demonstrated superior performance in the selective electro-catalytic reduction of Sn(Ⅳ)in an acidic solution.In addition,CN exhibited a lower potential in a dual-electrode elec-trolytic cell and maintained stability under acidic conditions,enabling the selective reduction of Sn(Ⅳ)to Sn(Ⅱ).
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维普
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