化工学报
化工學報
화공학보
JOURNAL OF CHEMICAL INDUSY AND ENGINEERING (CHINA)
2014年
11期
4356-4362
,共7页
蔡媛融%黄蕊%黄龙%饶路%陈声培%周志有%孙世刚
蔡媛融%黃蕊%黃龍%饒路%陳聲培%週誌有%孫世剛
채원융%황예%황룡%요로%진성배%주지유%손세강
催化剂载体%纳米粒子%碳载铂%催化%乙醇氧化
催化劑載體%納米粒子%碳載鉑%催化%乙醇氧化
최화제재체%납미입자%탄재박%최화%을순양화
catalyst support%nanoparticles%carbon supported platinum%catalysis%ethanol oxidation
利用NaBH4还原机制,采用经不同方法预处理的碳载体成功制备出Pt/C-HNO3、 Pt/C-H2O2和Pt/C 3种碳载铂纳米催化剂。通过扫描电镜(SEM)、透射电镜(HR-TEM)、循环伏安(CV)和 COad溶出技术进行表征。结果表明,所制备的催化剂大小分布较为均一,平均粒径约为4 nm;HR-TEM观察发现,Pt/C-HNO3中铂纳米粒子的表面具有较高的台阶原子密度;在COad溶出实验中Pt/C-HNO3表现出较强的抗一氧化碳毒化能力;所制备的3种催化剂及商业催化剂Pt/C JM对乙醇氧化的电催化活性顺序为:Pt/C-HNO3> Pt/C-H2O2> Pt/C > Pt/C JM,其中Pt/C-HNO3的电催化活性和稳定性分别为Pt/C JM的1.5倍和1.9倍。
利用NaBH4還原機製,採用經不同方法預處理的碳載體成功製備齣Pt/C-HNO3、 Pt/C-H2O2和Pt/C 3種碳載鉑納米催化劑。通過掃描電鏡(SEM)、透射電鏡(HR-TEM)、循環伏安(CV)和 COad溶齣技術進行錶徵。結果錶明,所製備的催化劑大小分佈較為均一,平均粒徑約為4 nm;HR-TEM觀察髮現,Pt/C-HNO3中鉑納米粒子的錶麵具有較高的檯階原子密度;在COad溶齣實驗中Pt/C-HNO3錶現齣較彊的抗一氧化碳毒化能力;所製備的3種催化劑及商業催化劑Pt/C JM對乙醇氧化的電催化活性順序為:Pt/C-HNO3> Pt/C-H2O2> Pt/C > Pt/C JM,其中Pt/C-HNO3的電催化活性和穩定性分彆為Pt/C JM的1.5倍和1.9倍。
이용NaBH4환원궤제,채용경불동방법예처리적탄재체성공제비출Pt/C-HNO3、 Pt/C-H2O2화Pt/C 3충탄재박납미최화제。통과소묘전경(SEM)、투사전경(HR-TEM)、순배복안(CV)화 COad용출기술진행표정。결과표명,소제비적최화제대소분포교위균일,평균립경약위4 nm;HR-TEM관찰발현,Pt/C-HNO3중박납미입자적표면구유교고적태계원자밀도;재COad용출실험중Pt/C-HNO3표현출교강적항일양화탄독화능력;소제비적3충최화제급상업최화제Pt/C JM대을순양화적전최화활성순서위:Pt/C-HNO3> Pt/C-H2O2> Pt/C > Pt/C JM,기중Pt/C-HNO3적전최화활성화은정성분별위Pt/C JM적1.5배화1.9배。
Carbon supported Pt nanocatalysts (Pt/C) are widely used in fuel cells. In this work, three kinds of Pt/C catalysts were successfully preparedvia a chemical reduction method by using carbon black pretreated with different methods,i.e., HNO3-pretreated carbon (Pt/C-HNO3), H2O2-pretreated carbon (Pt/C-H2O2) and unpretreated carbon (Pt/C). The morphologies and properties of the as-prepared Pt/C catalysts were characterized by SEM, HR-TEM, CV and COadstripping. Pt nanoparticles were dispersed well in these three Pt/C catalysts with average particle size of 3.4, 3.9 and 4.5 nm respectively. HR-TEM observation indicated that Pt/C-HNO3 possessed high-density of step atoms and COad stripping experiments showed that Pt/C-HNO3 exhibited the best anti-poisoning property. Comparing the catalytic activities of three as-prepared Pt/C catalysts toward ethanol electrooxidation with commercial Pt/C catalyst (Pt/C JM) showed that the as-prepared catalystsexhibited higher activity and stability than those of Pt/C JM and the order was Pt/C-HNO3>Pt/C-H2O2>Pt/C>Pt/C JM. Especially for Pt/C-HNO3, its activity and stability were 1.5 times and 1.9 times of those of Pt/C JM respectively.