采用乙二醇还原法制备了以炭气凝胶(CA)为载体的PtRu纳米颗粒催化剂.透射电镜(TEM)观察得知:PtRu的粒径为3nm左右,且在载体CA表面均匀分散.循环伏安和恒电位测试表明:催化剂的甲醇氧化启动电位和载体的孔结构没有明显依赖关系.以平均孔径较大的炭气凝胶为载体制备的催化剂拥有较高的甲醇氧化催化活性.可以认为催化剂活性的差异主要是由其不同的传质性能决定的.甲醇在较大的孔中扩散比较快,更容易到达PtRu颗粒的表面,从而提高了贵金属Pt的利用效率.
参考文献
| [1] | Arico A S;Srinivasan S;Antonucci V .DMFCs:From fundamental aspects to technology development[J].Fuel Cells,2001,1(02):133-161. |
| [2] | Ren X M;Zelenay P;Thomas S et al.Recent advances in direct methanol fuel cells at Los Alamos National Laboratory[J].Journal of Power Sources,2000,86(1-2):111-116. |
| [3] | Sharon C. Thomas;Xiaoming Ren;Shimshon Gottesfeld;Piotr Zelenay .Direct methanol fuel cells: progress in cell performance and cathode research[J].Electrochimica Acta,2002(22/23):3741-3748. |
| [4] | Arico A S;Shukla A K;El-Khatib K M et al.Effect of carbon-supported and unsupported Pt-Ru anodes on the performance of solid-polymer-electrolyte direct methanol fuel cells[J].Journal of Applied Electrochemistry,1999,29(06):671-676. |
| [5] | Li W Z;Liang C H;Zhou W J et al.Preparation and characte-rization of multiwalled carbon nanotube-supported platinum for cathode catalysts of direct methanol fuel cells[J].Journal of Physical Chemistry B,2003,107(26):6292-6299. |
| [6] | 周卫江,李文震,周振华,宋树芹,魏昭彬,孙公权,Tsiakaras P,辛勤.直接甲醇燃料电池阳极催化剂PtRu/C的制备和表征[J].高等学校化学学报,2003(05):858-862. |
| [7] | J. Guo;G. San;Q. Wang .Carbon nanofibers supported Pt-Ru electrocatalysts for direct methanol fuel cells[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(1):152-157. |
| [8] | Geun Seok Chai;Suk Bon Yoon;Jong-Sung Yu;Jong-Ho Choi;Yung-Eun Sung .Ordered Porous Carbons with Tunable Pore Sizes as Catalyst Supports in Direct Methanol Fuel Cell[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2004(22):7074-7079. |
| [9] | D.Wu;R.Fu;S.Zhang;M.S.Dresselhaus;G.Dresselhaus .Preparation of low-density carbon aerogels by ambient pressure drying[J].Carbon: An International Journal Sponsored by the American Carbon Society,2004(10):2033-2042. |
| [10] | Dingcai Wu;Ruowen Fu;Mildred S.Dresselhaus .Fabrication and nano-structure control of carbon aerogels via a microemulsion-templated sol-gel polymerization method[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(4):675-681. |
| [11] | Hongda Du;Baohua Li;Feiyu Kang .Carbon aerogel supported Pt-Ru catalysts for using as the anode of direct methanol fuel cells[J].Carbon: An International Journal Sponsored by the American Carbon Society,2007(2):429-435. |
| [12] | Du H D;Gan L;Li B H et al.Influences of mesopore width on oxygen reduction reaction catalysis of Pt/carbon aerogels[J].Journal of Physical Chemistry C,2007,111(05):2040-2043. |
| [13] | Rui Zhang;Wen Li;Kaixi Li;Chunxiang Lu;Liang Zhan;Licheng Ling .Effect of concentration of reactants on porosity of hydrogels, organic and carbon aerogels[J].Microporous and Mesoporous Materials,2004(1/3):167-173. |
| [14] | 张睿,梁晓怿,詹亮,李开喜,吕春祥,凌立成.酚醛-糠醛基炭气凝胶的合成和表征[J].新型炭材料,2002(04):23-28. |
| [15] | 张睿,徐耀,吕永根,李志宏,孟庆函,李开喜,吴东,凌立成,王俊,赵辉,荣利霞,董宝中.小角X射线散射研究制备炭气凝胶过程中凝胶的微结构演化[J].新型炭材料,2002(03):31-36. |
| [16] | Antolini E.;Giorgi L.;Passalacqua E.;Cardellini F. .Effect of Me (Pt plus Ru) content in Me/C catalysts on PtRu alloy formation: An XRD analysis[J].Journal of Materials Science Letters,2000(23):2099-2103. |
| [17] | Jeffrey W.Long;Rhohda M.Stroud;Karen E.Swider-Lyons;Debra R.Rolison .How To Make Electrocatalysts More Active for Direct Methanol oxidation-Avoid PtRu Bimetallic Alloys![J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2000(42):9772-9776. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%