摘要
研究了不同镍铁质量比的镍铁双氢氧化物的光电化学催化性能,并得到了催化活性最佳时的镍铁质量比为9∶1.重点考察了三电极体系的测试条件对Ni_(0.9)Fe_(0.1)-LDH光阳极光电化学动力学的影响.研究结果表明:电解池的测试结果与其透光率有关,使用石英电解池测得的工作电极光电流密度为5μA/cm^(2),是使用聚四氟乙烯电解池测得的工作电极光电流密度的5倍,但聚四氟乙烯电解池受自然环境背景光的影响小,结果更真实可靠;使用Hg/HgO作为参比电极,测试结果更加准确,虽然使用Ag/AgCl作为参比电极在相同条件下测得的光电流密度是使用Hg/HgO作为参比电极测得的光电流密度的2.5倍,但AgCl在碱性电解液中可产生Ag^(+),增大了体系中的电荷转移速率,影响了测试结果的准确性.在碱性电解液中,与石墨电极相比,铂片电极稳定性较差,不利于呈现接近真实情况的测试结果.
The photochemical catalytic performance of nickel-iron double hydroxides with different ratios has been studied,and the mass ratio of Ni to Fe at the optimum catalytic activity has been confirmed as 9∶1.Meanwhile,the influence of the test conditions of the three-electrode system on the photochemical kinetics of the Ni_(0.9)Fe_(0.1)-LDH photoanode has been systematically investigated.The results show that the test results of the electrolytic cell are related to the light transmittance.The photocurrent density of the working electrode measured by the quartz electrolytic cell is 5μA/cm^(2),which is 5 times that measured by the polytetrafluoroethylene electrolytic cell.However,the PTFE electrolytic cell is less affected by the background light in the natural environment,and the results are more reliable.It is also found that test results using Hg/HgO reference electrodes are more accurate.Although the photocurrent density measured by the Ag/AgCl reference electrode under the same conditions is 2.5 times that measured by the Hg/HgO reference electrode.However,AgCl may produce Ag~+in the alkaline electrolyte,which increases the charge transfer rate in the system and affects the accuracy of the testing results.In terms of the counter electrode,compared with the graphite rod,the Pt electrode exhibits smaller resistance,which is more conducive to charge transfer,making the cathode more prone to reduction reaction.However,in the alkaline electrolyte,the Pt electrode is less stable,which is unable to present the real test results.
作者
孙姣姣
杨晓红
安希忠
Sun Jiaojiao;Yang Xiaohong;An Xizhong(Northeastern University School of Metallurgy,Shenyang 110819,China;Northeastern University Institute for Frontier Technologies of Low-carbon Steelmaking,Shenyang 110819,China)
出处
《材料与冶金学报》
CAS
北大核心
2023年第4期387-394,共8页
Journal of Materials and Metallurgy
基金
国家自然科学基金面上项目(51974086)
东北大学基本科研业务费国家项目培育基金(N2225028).
