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polyoxometalate

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[交流] 请问已报道的光催化产氢最多是多少?10 mmol per hour per gram of photocatalysts

请问已报道的光催化产氢最多是多少?有比10 mmol per hour per gram of photocatalysts更多的报道吗?

[ Last edited by pzypdl on 2013-2-19 at 22:24 ]
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yanhj0

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pzypdl: 金币+1, 谢谢回帖交流! 2013-02-01 19:56:37
绝对产氢量是不可比的. 因为不同的实验所用的光源, 催化剂用量等不一定相同,所以没有可比性. 一般比较的是在某一波长下的量子效率.
2楼2013-02-01 19:46:07
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doctorzyjunior

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cxqtitan: 金币+1, 谢谢分享 2013-02-03 13:12:31
Ref: Chem. Mater. 2008, 20, 35-54
Current record holders in therms of quantum efficiencies (QEs) are NiO-modified La/KTaO3 (QE = 56%, pure water, UV light), ZnS (QE = 90%, aqueous Na2S/Na2SO3, light with λ> 300 nm), and Cr/Rh-modified GaN/ZnO (QE = 2.5%, pure water, visible light).
用QE做参考,比较起来才(目前公认 Angew. Chem. Int. Ed. 2010, 49, 1536-1539)有意义。所以,你所谓的“产氢”数量是一个不具有实际意义的数值。归一化很重要。就好比你单单讨论“TON”的多少,远不如“TOF”来得有可比较性。
3楼2013-02-03 04:49:08
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liuyinallen

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cxqtitan: 金币+1, 谢谢分享 2013-02-05 08:05:48
Agreed with "doctorzyjunior" said.
FYI, please check some references from Dr. Kudo's group, Dr. Domen's group and Dr. H. Teng's group (from National Cheng Kung University, Taiwan). I did some water splitting exp. using optimized Kudo's catalyst (NiO-NaTaO3:La). The max H2 evolution rate I observed is  ~10mmol/hr.gcat (pure water, low pressure UV lamp  90% ouput at 254 nm).
4楼2013-02-05 04:42:05
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polyoxometalate

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4楼: Originally posted by liuyinallen at 2013-02-05 04:42:05
Agreed with "doctorzyjunior" said.
FYI, please check some references from Dr. Kudo's group, Dr. Domen's group and Dr. H. Teng's group (from National Cheng Kung University, Taiwan). I did s ...

10mmol/hr.gcat是最大吗?
5楼2013-02-05 14:12:29
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polyoxometalate

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X Chen et al, Science 2011, DOI: 10.1126/science.1200448


The full spectrum solar simulator was used as the excitation source, which produces about 1 sun power at the sample consisting of black TiO2 nanocrystals loaded with 0.6 wt% Pt, placed in a Pyrex glass container filled with 1:1 watermethanol solution. (methanol is the sacrificial reagent and the anodic reaction generating O2 from H2O is not occurring in this system). Measurements were conducted initially for 15 consecutive days; each day the sample was irradiated for 5 hours, and then stored in darkness overnight before testing the next day. We found that 1 hour of solar irradiation generated 0.2 ± 0.02 mmol of H2 using 0.02 grams of disorderengineered black TiO2 nanocrystals (10 mmol per hour per gram of photocatalysts)
6楼2013-02-05 14:22:08
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polyoxometalate

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The energy conversion efficiency for solar hydrogen production, defined as the ratio between the energy of solar-produced hydrogen and the energy of the incident sunlight, reaches 24% for disorderengineered black TiO2 nanocrystals.
7楼2013-02-05 14:23:21
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polyoxometalate

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We also measured photocatalytic H2 production using black TiO2 as the photocatalyst with only visible and infrared light by filtering out incident light with wavelengths shorter than about 400 nm. The rate of H2 production dropped to 0.1 mmol +/- 0.02 per hour per gram of photocatalysts, reflecting the activity of the extended tail or mid-gap states of the thin disordered layer that have a narrower band gap created by disordering.
8楼2013-02-05 14:25:58
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Jefferypan

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polyoxometalate: 金币+10, 感谢参与讨论! 2013-02-14 09:20:58
我来凑凑热闹,跟着讨论讨论。说说我个人的看法。
per gram说白了讲是赖皮的说法,拿20mg样品做测试,然后结果乘以50倍?!一,从我看到的文献和访问过的小组都没有人拿1g测试的,效果肯定不好;二,20mg是这个效率,1g很有可能也就两倍三倍的产量。
如果可以这样计算的话,我的一个师兄有一个工作是ZnO-CdS异质结构产氢:100 mg sample; 300 W Xe lamp; 300 mL aqueous solution containing 0.1 m Na2S and 0.1 m Na2SO3.最高产量是1.92mmol每小时。计算起来就是19.2mmolH2/hour。(DOI: 10.1002/aenm.201100528)

我估计就算是这方面的大牛也很难把这些工作结果整理的条例清晰。前几年Chemical Review上的一篇关于产氢的综述也只是把很多结果罗列而已。
9楼2013-02-13 20:18:55
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