The other key to the operation of a PEM membrane is the thin layer of platinum-based catalyst that coats both of its sides and that represents 40 percent of the stack cost.

PEM 隔膜的另一运作关键，则是镀于隔膜两面的薄层铂触媒，占电池组成本的四成。

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Most fuel cells being developed for portable use are based on direct-methanol technology, which requires an expensive platinum catalyst.

大多数用于便携设备的燃料电池都是基于直接甲醇技术(译注1)，需要昂贵的铂催化剂。

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Then comes the cost of hydrogen-based vehicles. Just the platinum for the catalyst inside a fuel cell costs as much as an internal-combustion engine of equivalent power, according to a recent study.

然后就是氢动力汽车的成本问题，有研究表明，单是电池催化剂中所需白金的成本就已经相当于同马力引擎全部内燃装置的造价。

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The Zevco fuel cell uses an efficient, silver-based catalyst to promote the electricity-producing reaction, instead of a traditional platinum one.

ECONOMIST: Clean living in Iceland