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請(qǐng)問已報(bào)道的光催化產(chǎn)氫最多是多少?10 mmol per hour per gram of photocatalysts
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請(qǐng)問已報(bào)道的光催化產(chǎn)氫最多是多少?有比10 mmol per hour per gram of photocatalysts更多的報(bào)道嗎? [ Last edited by pzypdl on 2013-2-19 at 22:24 ] |
» 搶金幣啦!回帖就可以得到:
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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做參考,比較起來才(目前公認(rèn) Angew. Chem. Int. Ed. 2010, 49, 1536-1539)有意義。所以,你所謂的“產(chǎn)氫”數(shù)量是一個(gè)不具有實(shí)際意義的數(shù)值。歸一化很重要。就好比你單單討論“TON”的多少,遠(yuǎn)不如“TOF”來得有可比較性。 |
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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). |
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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) |
| 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. |
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我來湊湊熱鬧,跟著討論討論。說說我個(gè)人的看法。 per gram說白了講是賴皮的說法,拿20mg樣品做測(cè)試,然后結(jié)果乘以50倍?!一,從我看到的文獻(xiàn)和訪問過的小組都沒有人拿1g測(cè)試的,效果肯定不好;二,20mg是這個(gè)效率,1g很有可能也就兩倍三倍的產(chǎn)量。 如果可以這樣計(jì)算的話,我的一個(gè)師兄有一個(gè)工作是ZnO-CdS異質(zhì)結(jié)構(gòu)產(chǎn)氫:100 mg sample; 300 W Xe lamp; 300 mL aqueous solution containing 0.1 m Na2S and 0.1 m Na2SO3.最高產(chǎn)量是1.92mmol每小時(shí)。計(jì)算起來就是19.2mmolH2/hour。(DOI: 10.1002/aenm.201100528) 我估計(jì)就算是這方面的大牛也很難把這些工作結(jié)果整理的條例清晰。前幾年Chemical Review上的一篇關(guān)于產(chǎn)氫的綜述也只是把很多結(jié)果羅列而已。 |
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