摘要
十六烷基三甲基溴化铵(CTAB)为模板剂,水热法制备介孔SnO_(2)载体,以Adams法制备40%IrO_(2)(质量分数)负载型催化剂,采用BET、XPS、XRD、TEM等手段对载体及催化剂结构与性能进行表征与分析;然后用Sb、Co掺杂SnO_(2)载体并合成催化剂,探究其对载体及催化剂结构与性能的影响。结果表明:当水热反应时间为24 h时,获得的载体最有利于催化剂负载,并获得最优性能。掺杂有效改善了SnO_(2)质子传递,当Sb掺杂SnO_(2)时,其催化剂电化学循环性能不断增高,Sb掺杂量为20%(摩尔分数,下同)时,催化剂获得最好电化学性能;而当Co掺杂SnO_(2)时,其催化剂电化学循环性能降低,Co掺杂量为5%时,催化剂获得最好性能,其电化学活性面积最大时,伏安电荷量Q^(*)为1478 mC·(cm^(2)·mg)^(-1)。最后对不同掺杂元素单电池进行测试,Co掺杂的SnO_(2)对IrO_(2)单电池性能提升最大,在1.0 A/cm 2测试条件下析氧过电位为1.884 V。研究发现掺杂后催化剂性能与掺杂离子的价态及尺寸有直接关系,离子价态差越大,催化性能越高。Sb离子尺寸高于Sn^(4+),性能随掺杂量增大而提高;Co离子尺寸低于Sn^(4+),性能随掺杂量增大而降低。
The mesoporous SnO_(2)support was prepared by hydrothermal method using cetyltrimethylammonium bromide(CTAB)as template,and the catalyst supported was prepared by Adams method,and the dosage of IrO_(2)was 40%(mass fraction).The structures and properties of the supporters and catalysts were characterized and analyzed by BET,XPS,XRD,and TEM.Then,Sb and Co doped SnO_(2)carriers were used to synthesize the catalyst to explore its influence on the structure and performance of the supporters and catalysts.The results show that when the hydrothermal reaction time is 24 h,the obtained carrier is most beneficial to the catalyst and obtain the optimal performance.Simultaneously,Sb and Co doped SnO_(2)supporters are used to synthesize the catalyst,and the effects of ion valence state and ion size on the structure and properties of the supporters and catalysts are investigated.Doping with Sb and Co can effectively improve the proton transfer of SnO_(2).When Sb is doped with SnO_(2),the electrochemical cycle performance of the catalysts continues to increase.When the doping amount is 20%(mole fraction,the same below),the catalyst obtains the best electrochemical performance;and with the increases of Co doping,the electrochemical cycle performance of the catalysts is reduced.When the doping amount is 5%,the electrochemical active area is the largest,the voltammetric charge Q*is equal to 1478 mC·(cm 2·mg)-1.Finally,by testing the performance of single cell with different doping elements to research:Co doped SnO_(2)has the greatest improvement on the performance of IrO_(2)single cell.The anodic overpotential for oxygen evolution was 1.884 V under the test conditions of 1.0 A/cm 2.The performances of the doped catalyst are directly related to the valence state and ion size of the doped ion.The larger the valence difference between ions,the higher the catalytic performance of the catalysts.The ionic sizes of Sb are larger than that of Sn^(4+),and the performance improves with the increase of doping amount;and the average ionic s
作者
陈刚
熊施权
吕洪
郝传璞
CHEN Gang;XIONG Shiquan;LYU Hong;HAO Chuanpu(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Clean Energy Automotive Engineering Center,Tongji University,Shanghai 201804,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第3期113-118,共6页
Materials Reports
基金
国家自然科学基金(21306141)。
