Solid acids accelerate the photocatalytic hydrogen peroxide synthesis over a hybrid catalyst of titania nanotube with carbon dot
Solid acids accelerate the photocatalytic hydrogen peroxide synthesis over a hybrid catalyst of titania nanotube with carbon dot
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固体酸在二氧化钛纳米管与碳点混合催化剂上加速光催化过氧化氢合成
DOI：
10.1016/j.apcatb.2018.11.087
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发表时间：
2019-05
期刊：
影响因子：
--
通讯作者：
Xiao Feng Shou
中科院分区：
文献类型：
--
作者：
Ma Runyuan;Wang Liang;Wang Hai;Liu Ziyu;Xing Mingyang;Zhu Longfeng;Meng Xiangju;Xiao Feng Shou
水氧光催化合成过氧化氢（H2O2）是清洁能源储存和化学合成的替代途径，但仍存在H2O2产率和太阳能-化学能源转换效率不足的问题。本文报道了一种质子型钛纳米管-碳点杂化催化剂（HTNT-CD），该催化剂在可见光照射下高效生成h2o2 (λ > 420 nm， h2o2产率为3.42 mmol gcat−1⋅h−1)，优于以往报道的含贵金属的钛催化剂和氮化碳催化剂。多项研究表明，HTNT-CD上的质子对H2O2的生成至关重要，它能有效地加速分子氧还原生成H2O2的半反应，并能有效地阻碍H2O2在辐照条件下的分解。HTNT-CD催化剂使太阳能到h2o2的表观能量转换效率达到5.2%，是商用P25和cd催化剂（1.06%）的4.9倍。更重要的是，HTNT-CD很稳定，在连续循环测试中提供了很高的h2o2生产率。
Photocatalytic synthesis of hydrogen peroxide (H2O2) from water and oxygen is an alternative route for clean energy storage and chemical synthesis, but still having problems with insufficient H2O2productivity and solar-to-chemical energy conversion efficiency. Herein, we reported a hybrid catalyst of proton-form titania nanotube with carbon dot (HTNT-CD) that is highly efficient for the production of H2O2under visible-light irradiation (λ > 420 nm, H2O2productivity at 3.42 mmol gcat−1⋅h−1), outperforming the titania catalysts containing noble metals and the carbon nitride catalysts reported previously. Multiple studies demonstrate that the protons on the HTNT-CD are crucial for the production of H2O2by efficiently accelerating the half reaction of molecular oxygen reduction to form H2O2, and effectively hindering H2O2decomposition under the irradiation conditions. This HTNT-CD catalyst gives solar-to-H2O2apparent energy conversion efficiency at 5.2%, which is even 4.9 times of that (1.06%) over the catalyst derived from commercial P25 and CDs. More importantly, the HTNT-CD is stable, giving high H2O2productivity in the continuous recycle tests.
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