当前位置：
X-MOL 学术
›
ACS Sustain. Chem. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Premixed Stagnation Flame Synthesized TiO2 Nanoparticles with Mixed Phases for Efficient Photocatalytic Hydrogen Generation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-09-25 00:00:00 , DOI: 10.1021/acssuschemeng.8b03142 Shuyang Wu 1, 2 , Weijing Wang 1, 2 , Wenguang Tu 1 , Shengming Yin 1 , Yuan Sheng 1, 2 , Manoel Y. Manuputty 2, 3 , Markus Kraft 2, 3 , Rong Xu 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-09-25 00:00:00 , DOI: 10.1021/acssuschemeng.8b03142 Shuyang Wu 1, 2 , Weijing Wang 1, 2 , Wenguang Tu 1 , Shengming Yin 1 , Yuan Sheng 1, 2 , Manoel Y. Manuputty 2, 3 , Markus Kraft 2, 3 , Rong Xu 1, 2
Affiliation
|
Mixed-phase TiO2 nanoparticles (10–20 nm) composed of rutile, anatase, and srilankite phases are prepared through a one-step flame synthesis method. The phase composition of TiO2 nanoparticles can be easily tuned by changing the flame conditions such as the gas flow rates of the fuel, oxygen, and argon carrier. The optimized anatase/rutile/srilankite TiO2 sample with as low as 0.1 wt % of Pt cocatalyst exhibits remarkable photocatalytic H2 generation rate of 21.9 mmol h–1 g–1 and an apparent quantum efficiency (AQE) of 39.4% at 360 nm, higher than those of anatase/rutile or anatase TiO2. The less studied srilankite phase is first time investigated for photocatalytic H2 generation. It is revealed that the relatively low content of srilankite phase in TiO2 could efficiently promote charge separation and transportation. It is remarkable that, compared to the commercial P25 TiO2, the flame-made TiO2 significantly improves Pt reduction and dispersion owing to the oxygen vacancies and surface defects. The optimized TiO2 sample with surface defects facilitates the deposition of ultrasmall Pt nanoclusters of around 0.63 nm and stabilizes the low valence state of Pt0, leading to efficient utilization of noble metal and remarkable enhancement of H2 generation rate.
中文翻译：
混合相的预混合滞止火焰合成TiO 2纳米颗粒用于高效光催化氢生成
通过一步法火焰合成方法制备了由金红石，锐钛矿和斯里兰卡沸石相组成的混合相TiO 2纳米颗粒（10–20 nm）。可以通过改变火焰条件（例如燃料，氧气和氩气载体的气体流速）轻松调整TiO 2纳米颗粒的相组成。低至0.1 wt％的Pt助催化剂的优化锐钛矿/金红石/绢晶TiO 2样品在360 nm处具有21.9 mmol h –1 g –1的显着光催化H 2生成速率和39.4％的表观量子效率（AQE）高于锐钛矿/金红石或锐钛矿TiO 2的那些。少有人研究的绢云母相首次被研究用于光催化生成H 2。结果表明，TiO 2中绢云母相含量较低，可以有效促进电荷的分离和迁移。值得注意的是，与商业化的P25 TiO 2相比，火焰制得的TiO 2由于氧空位和表面缺陷而显着改善了Pt的还原和分散。经过优化的具有表面缺陷的TiO 2样品可促进约0.63 nm的超小Pt纳米团簇的沉积，并稳定Pt 0的低价态，从而导致贵金属的有效利用和H 2的显着增强 发生率。
更新日期：2018-09-25
中文翻译：
混合相的预混合滞止火焰合成TiO 2纳米颗粒用于高效光催化氢生成
通过一步法火焰合成方法制备了由金红石，锐钛矿和斯里兰卡沸石相组成的混合相TiO 2纳米颗粒（10–20 nm）。可以通过改变火焰条件（例如燃料，氧气和氩气载体的气体流速）轻松调整TiO 2纳米颗粒的相组成。低至0.1 wt％的Pt助催化剂的优化锐钛矿/金红石/绢晶TiO 2样品在360 nm处具有21.9 mmol h –1 g –1的显着光催化H 2生成速率和39.4％的表观量子效率（AQE）高于锐钛矿/金红石或锐钛矿TiO 2的那些。少有人研究的绢云母相首次被研究用于光催化生成H 2。结果表明，TiO 2中绢云母相含量较低，可以有效促进电荷的分离和迁移。值得注意的是，与商业化的P25 TiO 2相比，火焰制得的TiO 2由于氧空位和表面缺陷而显着改善了Pt的还原和分散。经过优化的具有表面缺陷的TiO 2样品可促进约0.63 nm的超小Pt纳米团簇的沉积，并稳定Pt 0的低价态，从而导致贵金属的有效利用和H 2的显着增强 发生率。
京公网安备 11010802027423号