Performance of a Direct Methanol Fuel Cell

采用商品Pt_Ru/C和Pt/C催化剂制备成甲醇阳极和氧阴极 ,Nafion_115为固体电解质膜 ,组装成面积为 9cm2 单电池 ,研究了电池在放电运转过程中各种操作条件 ,如温度 ,氧气压力 ,甲醇浓度等对电池性能的影响 ,并考察了电池室温放电性能随时间的变化 .发现增加电池的温度和氧气压力均可明显提高电池性能 ,在合适的甲醇浓度和氧气压力下电池在室温具有一定的稳定放电性能A direct methanol fuel cell with 9cm 2 active area consists of Pt_Ru/C anode,Pt/C cathode and Nafion 115 membrane.The effect of operating conditions:methanol solution concentration,oxygen pressure and cell temperature on the cell performances was investigated.The results show that performance of single cell was enhanced by increasing oxygen pressure and cell temperature,and a maximum power density 75 mW/cm 2 was obtained in the range of 250_300 mA/cm 2 current density,0.2 MPa oxygen pressure,1.0 mol/L methanol concentration and 75 ℃ cell temperature.When cell operating at room temperature,a relatively low,but a stable performance of cell was also observed.作者联系地址：中国科学院大连化学物理研究所!辽宁大连116023,中国科学院大连化学物理研究所!辽宁大连116023,中国科学院大连化学物理研究所!辽宁大连116023,中国科学院大连化学物理研究所!辽宁大连116023,中国科学院大连化学物理研究所!辽宁大连116023,安徽省宁国天成电器有限公司!安徽宁国Author's Address: 1.Dalian Inst. of Chem. Phys.,Chinese Acad. of Sci.,Dalian 116023,China; 2.Anhui Ningguo Tiancheng Electric Co.,LTD,Ninggo 24

保水剂对梭梭（Haloxylon ammodendron）、白梭梭（Haloxylon persicum）种子萌发及幼苗根系的影响/Effect of Super Absorbent Polymer on Seed Germination and Seedling Roots of Haloxylon ammodendron and H. persicum[J]

在盆栽条件下,研究保水剂对梭梭（Haloxylon ammodendron）、白梭梭（Haloxylon persicum）种子萌发和幼苗根系形态的影响。结果表明：0.05%浓度的保水剂对梭梭、白梭梭种子萌发有明显的促进作用,发芽率较对照分别提高了18.7%和24.0%;0.05%浓度的保水剂能够抑制梭梭幼苗根系的垂直生长,有效促进侧根数量的增加和根系生物量的积累;0.1%浓度保水剂处理下,白梭梭的主根长度、侧根数量、根系生物量均达到最大;保水剂浓度达到0.2%时,梭梭、白梭梭种子萌发和幼苗根系的生长均受到抑制,表明梭梭幼苗生长最适宜的保水剂浓度为0.05%,白梭梭的浓度以0.05%～0.1%为宜