斯坦福科学家发明高效锌空气电池
文章来源:未知 文章作者:enread 发布时间:2013-05-31 08:09 字体: [ ]  进入论坛
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Stanford University scientists have developed an advanced zinc1-air battery with higher catalytic activity and durability2 than similar batteries made with costly3 platinum4(铂) and iridium(铱) catalysts5. The results, published in the May 7 online edition of the journal Nature Communications, could lead to the development of a low-cost alternative to conventional lithium-ion batteries widely used today. "There have been increasing demands for high-performance, inexpensive and safe batteries for portable electronics, electric vehicles and other energy storage applications," said Hongjie Dai, a professor chemistry at Stanford and lead author of the study. "Metal-air batteries offer a possible low-cost solution."
 
According to Dai, most attention has focused on lithium-ion batteries, despite their limited energy density7 (energy stored per unit volume), high cost and safety problems. "With ample supply of oxygen from the atmosphere, metal-air batteries have drastically higher theoretical energy density than either traditional aqueous batteries or lithium-ion batteries," he said. "Among them, zinc-air is technically8 and economically the most viable9 option."
 
Zinc-air batteries combine atmospheric10 oxygen and zinc metal in a liquid alkaline electrolyte(电解质) to generate electricity with a byproduct of zinc oxide11. When the process is reversed during recharging, oxygen and zinc metal are regenerated12.
 
"Zinc-air batteries are attractive because of the abundance and low cost of zinc metal, as well as the non-flammable nature of aqueous electrolytes, which make the batteries inherently safe to operate," Dai said. "Primary (non-rechargeable) zinc-air batteries have been commercialized for medical and telecommunication13 applications with limited power density. However, it remains14 a grand challenge to develop electrically rechargeable batteries, with the stumbling blocks being the lack of efficient and robust15 air catalysts, as well as the limited cycle life of the zinc electrodes."
 
Active and durable16 electrocatalysts on the air electrode are required to catalyze17 the oxygen-reduction reaction during discharge and the oxygen-evolution reaction during recharge. In zinc-air batteries, both catalytic reactions are sluggish18, Dai said.
 
Recently, his group has developed a number of high-performance electrocatalysts made with non-precious metal oxide or nanocrystals hybridized with carbon nanotubes. These catalysts produced higher catalytic activity and durability in alkaline(碱性的) electrolytes than catalysts made with platinum and other precious metals.
 
"We found that similar catalysts greatly boosted the performance of zinc-air batteries," Dai said. both primary and rechargeable. "A combination of a cobalt-oxide hybrid19 air catalyst6 for oxygen reduction and a nickel-iron hydroxide hybrid air catalyst for oxygen evolution resulted in a record high-energy efficiency for a zinc-air battery, with a high specific energy density more than twice that of lithium-ion technology."
 
The novel battery also demonstrated good reversibility and stability over long charge and discharge cycles over several weeks. "This work could be an important step toward developing practical rechargeable zinc-air batteries, even though other challenges relating to the zinc electrode and electrolyte remain to be solved," Dai added.


点击收听单词发音收听单词发音  

1 zinc DfxwX     
n.锌;vt.在...上镀锌
参考例句:
  • Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。
  • Zinc is used to protect other metals from corrosion.锌被用来保护其他金属不受腐蚀。
2 durability Orxx5     
n.经久性,耐用性
参考例句:
  • Nylons have the virtue of durability.尼龙丝袜有耐穿的优点。
3 costly 7zXxh     
adj.昂贵的,价值高的,豪华的
参考例句:
  • It must be very costly to keep up a house like this.维修这么一幢房子一定很昂贵。
  • This dictionary is very useful,only it is a bit costly.这本词典很有用,左不过贵了些。
4 platinum CuOyC     
n.白金
参考例句:
  • I'll give her a platinum ring.我打算送给她一枚白金戒指。
  • Platinum exceeds gold in value.白金的价值高于黄金。
5 catalysts 677fdea123458fc2ff92eb84d07254e9     
n.催化剂( catalyst的名词复数 );触媒;促进因素;有感染力的人
参考例句:
  • The first catalytic converters were called conventional oxidation catalysts. 最初的转化器叫做常规氧化催化器。 来自辞典例句
  • Many processes that are essential to the chemical industry use heterogeneous catalysts. 很多重要的化学工业过程就是使用多相催化剂的。 来自辞典例句
6 catalyst vOVzu     
n.催化剂,造成变化的人或事
参考例句:
  • A catalyst is a substance which speeds up a chemical reaction.催化剂是一种能加速化学反应的物质。
  • The workers'demand for better conditions was a catalyst for social change.工人们要求改善工作条件促进了社会变革。
7 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
8 technically wqYwV     
adv.专门地,技术上地
参考例句:
  • Technically it is the most advanced equipment ever.从技术上说,这是最先进的设备。
  • The tomato is technically a fruit,although it is eaten as a vegetable.严格地说,西红柿是一种水果,尽管它是当作蔬菜吃的。
9 viable mi2wZ     
adj.可行的,切实可行的,能活下去的
参考例句:
  • The scheme is economically viable.这个计划从经济效益来看是可行的。
  • The economy of the country is not viable.这个国家经济是难以维持的。
10 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
11 oxide K4dz8     
n.氧化物
参考例句:
  • Oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见。
  • How can you get rid of this oxide coating?你们该怎样除去这些氧化皮?
12 regenerated 67df9da7e5af2af5acd8771deef0296f     
v.新生,再生( regenerate的过去式和过去分词 )
参考例句:
  • They are regarded as being enveloped in regenerated gneisses. 它们被认为包围在再生的片麻岩之中。 来自辞典例句
  • The party soon regenerated under her leadership. 该党在她的领导下很快焕然一新。 来自辞典例句
13 telecommunication 5gMzg5     
n.电信,远距离通信
参考例句:
  • Telecommunication is an industry of service.电信业是一个服务型的行业。
  • I only care about the telecommunication quality and the charge.我只关心通信质量和资费两个方面。
14 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
15 robust FXvx7     
adj.强壮的,强健的,粗野的,需要体力的,浓的
参考例句:
  • She is too tall and robust.她个子太高,身体太壮。
  • China wants to keep growth robust to reduce poverty and avoid job losses,AP commented.美联社评论道,中国希望保持经济强势增长,以减少贫困和失业状况。
16 durable frox4     
adj.持久的,耐久的
参考例句:
  • This raincoat is made of very durable material.这件雨衣是用非常耐用的料子做的。
  • They frequently require more major durable purchases.他们经常需要购买耐用消费品。
17 catalyze BTiyV     
v.催化
参考例句:
  • They are highly specific for the reactions that they catalyze.它们对被它们催化的反应有很强的专一性。
  • They are highly specific for the reactions that they catalyze.它们对被它们催化的反应有很强的专一性。
18 sluggish VEgzS     
adj.懒惰的,迟钝的,无精打采的
参考例句:
  • This humid heat makes you feel rather sluggish.这种湿热的天气使人感到懒洋洋的。
  • Circulation is much more sluggish in the feet than in the hands.脚部的循环比手部的循环缓慢得多。
19 hybrid pcBzu     
n.(动,植)杂种,混合物
参考例句:
  • That is a hybrid perpetual rose.那是一株杂交的四季开花的蔷薇。
  • The hybrid was tall,handsome,and intelligent.那混血儿高大、英俊、又聪明。
TAG标签: air battery zinc
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