新型炭材料
新型炭材料
신형탄재료
NEW CARBON MATERIALS
2015年
2期
150-155
,共6页
Pd纳米颗粒%自发沉积%多壁碳纳米管%表面活性剂%乙醇氧化
Pd納米顆粒%自髮沉積%多壁碳納米管%錶麵活性劑%乙醇氧化
Pd납미과립%자발침적%다벽탄납미관%표면활성제%을순양화
Pd nanoparticle%Spontaneous deposition%Multi-walled carbon nanotube%Surfactant%Ethanol oxidation
在无还原剂存在下,氯化钯在Vulcan XC-72碳粉( C)、多壁碳纳米管( MWCNT)和碳球( CM)等碳质材料表面上自发还原为金属钯,从而得到相应的钯纳米颗粒( Pd-C、Pd-MWCNT和Pd-CM)。用阳离子表面活性剂十六烷基三甲基溴化铵( CTAB)对这些碳质材料修饰后,采用同样的自发还原方法分别制备出Pd/CTAB-C、Pd/CTAB-MWCNT和Pd/CTAB-CM催化剂。结果表明,CTAB修饰后的MWCNT明显增加了钯纳米颗粒的自发沉积量,粒径大约为9 nm,而在MWCNT上沉积的纳米Pd粒径为19 nm。 Pd/CTAB-MWCNT在碱性条件下对乙醇氧化的电流密度达到44.2 mA·cm-2,与其他碳载体负载的Pd纳米催化剂相比,对乙醇氧化具有强而稳定的电催化活性。
在無還原劑存在下,氯化鈀在Vulcan XC-72碳粉( C)、多壁碳納米管( MWCNT)和碳毬( CM)等碳質材料錶麵上自髮還原為金屬鈀,從而得到相應的鈀納米顆粒( Pd-C、Pd-MWCNT和Pd-CM)。用暘離子錶麵活性劑十六烷基三甲基溴化銨( CTAB)對這些碳質材料脩飾後,採用同樣的自髮還原方法分彆製備齣Pd/CTAB-C、Pd/CTAB-MWCNT和Pd/CTAB-CM催化劑。結果錶明,CTAB脩飾後的MWCNT明顯增加瞭鈀納米顆粒的自髮沉積量,粒徑大約為9 nm,而在MWCNT上沉積的納米Pd粒徑為19 nm。 Pd/CTAB-MWCNT在堿性條件下對乙醇氧化的電流密度達到44.2 mA·cm-2,與其他碳載體負載的Pd納米催化劑相比,對乙醇氧化具有彊而穩定的電催化活性。
재무환원제존재하,록화파재Vulcan XC-72탄분( C)、다벽탄납미관( MWCNT)화탄구( CM)등탄질재료표면상자발환원위금속파,종이득도상응적파납미과립( Pd-C、Pd-MWCNT화Pd-CM)。용양리자표면활성제십륙완기삼갑기추화안( CTAB)대저사탄질재료수식후,채용동양적자발환원방법분별제비출Pd/CTAB-C、Pd/CTAB-MWCNT화Pd/CTAB-CM최화제。결과표명,CTAB수식후적MWCNT명현증가료파납미과립적자발침적량,립경대약위9 nm,이재MWCNT상침적적납미Pd립경위19 nm。 Pd/CTAB-MWCNT재감성조건하대을순양화적전류밀도체도44.2 mA·cm-2,여기타탄재체부재적Pd납미최화제상비,대을순양화구유강이은정적전최화활성。
Pd nanoparticles ( Pd-NPs) were deposited on the surface of Vulcan XC-72 carbon black ( CB) , multi-walled carbon nanotubes ( MWCNTs) and carbon spheres ( CSs) by the spontaneous reduction of PdCl2 with oxygen-functional groups on the car-bon surfaces to produce catalysts for the electrochemical oxidation of ethanol. These carbons were also modified with a cationic sur-factant ( hexadecyltrimethyl ammonium bromide, CTAB) and subsequently used as supports for the deposition of Pd nanoparticles using the spontaneous reduction method. SEM, TEM and XRD were used to characterize their structures. Pd-NPs with a size of ca. 9 nm were obtained on the surface of the CTAB-modified MWCNTs. The amount of Pd-NPs spontaneously deposited on the CTAB-MWCNTs is much larger than that on the MWCNTs, CB or CSs. The Pd/CTAB-MWCNTs exhibit a higher anodic peak current density of 44. 2 mA·cm-2 in cyclic voltammetry, indicating a better electrocatalytic activity for ethanol oxidation than the other cat-alysts.
