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标题: 高手进来帮忙英文翻译 [打印本页]

作者: Lark 时间: 2007-7-23 17:00
标题: 高手进来帮忙英文翻译
老板给了一篇关于燃料电池的文献要我翻译，，，我自己用金山看了半天能看个大概意思懂，
但是很多地方确实不知道怎么表达出来，谁能帮忙翻译下，
永感大恩。

Dry layer preparation and characterization of polymer electrolyte fuel cell components.

Preparation technique
The aim of the preparation process development at DLR was to achieve a low-cost and effective manufacturing process for PEFC MEAs. Therefore, a novel technique for MEA production was developed at DLR[26a,26b],This process is based on other dry production techniques developed at DLR[2,3,20,27-29].The fundamental idea for this simple process is to spray a dry catalytic layer directly onto the membrane to avoid waiting times for evaporating solvents and at the same time, to accomplish good contact between the catalytic layer and the electrolyte membrane。Therefore, it was necessary to develop a dry coating system that can handle fine powders ( <0.1 um diameter) like carbon-supported catalysts (e. g, Pt on Vulcan XC-72).

The preparation process for MEAs is divided into three main steps:
1. Preparation of the electrode powder
2. Dry spraying the powder onto the membrane
3. Hot rolling or pressing the membrane with the gas diffusion layers Fig。1 shows a scheme of the manufacturing process.
The first main preparation step for MEA production comprises mixing of the reactive layer material(e. g, platinum supported on carbon black with different amounts of PTFE, polymer electrolyte powder and/ or filler materials) in a knife mill[2,30]。In order to obtain homogeneous and thin reactive layers, the material is atomized and sprayed in a nitrogen stream through a slit nozzle directly on a membrane. The adhesion of the catalytic layer material onto the surface is already secure. However, in order to improve the electrical and ionic contact, it is necessary to fix the layer by hot rolling or pressing. Depending on the degree atomization of a completely uniformly covered reactive layer, with thickness down to 5 um, can be prepared using the production technique described. This fact yields to a low noble metal catalyst loading.

In addition to the preparation of the reaction layers, this technique can also be used to form a hydrophobic coverage for the surface of the MEA backing material , especially as this preparation step of the electrode production is also free of solvents.

From the low catalyst loading combined with the simplicity and degree of automation of the procedure , it is clear that the aim of a low-cost production technique can be achieved. By changing the composition of the raw powder and the deposition conditions of subsequent layers , it is possible to establish gradients, for instance , in porosity, catalyst loading or hydrophobicity in electrodes for other applications, for example, for DMFC. Another advantage of this production technique is that environmentally hazardous solvents are totally avoided. In addition this technique can be scaled up to an industrial production process. From all the advantages, it is clear that our procedure has the capability to become an important industrial production technique for fuel cell MEA..

The electrode raw powder for standard MEAs consists of 20 wt% PTFE( Hostaflon TF 2053 from Hoechst ) and 80 wt% carbon-supported Pt (20 wt% Pt on Vulcan XC-72 from E-TEK) and is mixed in a knife mill for 5 s. In the next step, the powder is transferred to a sprayer where it is sprayed on the membrane in thin layers by moving the membrane over a coating nozzle. Thereby , various Pt-loadings up to 4 mg/cm2 and down to 0.05 mg/cm2 are possible, TO fix the catalytic layer and to complete the MEA, gas-diffusion layers are hot-rolled or pressed onto the coated membrane, Fig 2 shows the performance of a standard MEA with Nafion112 membrane and a Pt-loading of 0.07 mg/cm2 on each electrode.

作者: 1000 时间: 2007-7-23 17:01
我沙发

作者: 阿布 时间: 2007-7-23 17:01
不懂英文。

作者: 老玻璃 时间: 2007-7-23 17:03
不懂英文。

作者: Cherry 时间: 2007-7-23 17:03
不懂E文,进来看下我哥~

作者: Mutombo 时间: 2007-7-23 17:04
注意我的昵称。。。

作者: =T.J=duckwy 时间: 2007-7-23 17:04
懂一点可是还没那么高的境界!

作者: 1000 时间: 2007-7-23 17:04
哦？
大家都木懂？
哎
其实啊
我也木懂

作者: 按摩神族 时间: 2007-7-23 17:08
提示: 作者被禁止或删除内容自动屏蔽

作者: carolyn 时间: 2007-7-23 17:09
标题: 回复 #3 阿布的帖子
你不都是说英文泡洋妞的?

作者: ilovestarc_++ 时间: 2007-7-23 17:09
好象是专业英语

作者: 1000 时间: 2007-7-23 17:10
专业
非专业的
都看不懂

作者: tingshuo77 时间: 2007-7-23 17:11

原帖由 Mutombo 于 2007-7-23 17:04 发表
注意我的昵称。。。

貌似有个单词拼错了

作者: 红狼 时间: 2007-7-23 17:12
不懂英文。

作者: 星际争霸 时间: 2007-7-23 17:12

原帖由 老玻璃 于 2007-7-23 17:03 发表
不懂英文。

骗人
你是澳大利亚猛男

作者: liczy0414 时间: 2007-7-23 17:13
提示: 作者被禁止或删除内容自动屏蔽

作者: 1000 时间: 2007-7-23 17:13
没人懂了？

作者: ilovestarc_++ 时间: 2007-7-23 17:14
标题: 回复 #12 1000 的帖子
老大专业英语恐怕有时候英语8级来了也没办法

作者: cret 时间: 2007-7-23 17:14
太专业了...

作者: Ud.Bird 时间: 2007-7-23 17:15
太长了

作者: 1000 时间: 2007-7-23 17:15

原帖由 ilovestarc_++ 于 2007-7-23 17:14 发表
老大专业英语恐怕有时候英语8级来了也没办法

哦哦
我的英语只过了3级
4级都没过

作者: ilovestarc_++ 时间: 2007-7-23 17:19
标题: 回复 #21 1000 的帖子
英语还有3级？？

作者: 1000 时间: 2007-7-23 17:20
是有3级啊
不过3级一般都不说
只说4级

作者: 允诺 时间: 2007-7-23 17:20
我听过三级半的

太　长了
不想看

作者: Mutombo 时间: 2007-7-23 17:22

原帖由 tingshuo77 于 2007-7-23 17:11 发表

貌似有个单词拼错了

厄。。。

作者: Lark 时间: 2007-7-23 17:30
我擦，，没有一个人懂啊？？？？？？？？？？

作者: 阿布 时间: 2007-7-23 17:31

原帖由 carolyn 于 2007-7-23 17:09 发表
你不都是说英文泡洋妞的?

老子炮妞不讲电池的原理，

作者: carolyn 时间: 2007-7-23 17:32
标题: 回复 #27 阿布的帖子
当使用电动按摩棒的时候

你不会趁机表现一下自己的渊博?

作者: 秋 时间: 2007-7-23 17:34
木有SJ　不帮忙哈～

作者: 阿布 时间: 2007-7-23 17:35

原帖由 carolyn 于 2007-7-23 17:32 发表
当使用电动按摩棒的时候

你不会趁机表现一下自己的渊博?

讲电池也不讲燃料电池

作者: Aphrodite 时间: 2007-7-23 17:40
....

作者: Lark 时间: 2007-7-23 20:25

原帖由秋于 2007-7-23 17:34 发表
木有SJ　不帮忙哈～

.........
帮个忙，以后肯定比给ＳＪ的好处多撒

作者: hpPlayer 时间: 2007-7-23 20:28
....长

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