Nishiyama Naoto, Oono Kyouhei, Takeuchi Hiroto, Yukimoto Mariko, Takaguchi Yutaka
Division of Sustainable Energy, Graduate School of Science and Engineering, Hirosaki University, Hirosaki 036-8561, Japan.
Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan.
ACS Omega. 2024 Aug 29;9(36):38180-38185. doi: 10.1021/acsomega.4c05671. eCollection 2024 Sep 10.
Titanium dioxide doped with Pt(IV) ions was synthesized via a sol-gel method, incorporating a sol purification process through dialysis. The doped Pt(IV) ions were reduced by UV light irradiation to obtain a transparent Pt-TiO sol, with Pt(0) acting as a cocatalyst for hydrogen evolution. The hydrogen evolution activity of Pt-TiO sol was evaluated under UV light irradiation using methanol as a sacrificial reagent. 0.05 atom % Pt-TiO sol remained in the sol state without precipitation after 10 h of UV light irradiation. The amount of hydrogen produced after 10 h of light irradiation was 1195 μmol, with a turnover number (TON) of 664.1, a turnover frequency (TOF) of 66.4 h, and an apparent quantum yield (AQY) of 0.86%. The sol-gel synthesis from the molecular level is thought to result in Pt ions being doped inside the TiO particles, maintaining high dispersibility by suppressing particle growth due to the aggregation of Pt(0) during the UV reduction of Pt(IV) ions. These results show that the Pt-TiO photocatalyst has a high renewable energy factor because it can be synthesized at room temperature, and the aggregation of Pt-TiO particles is suppressed by making full use of a sol-gel method.
通过溶胶-凝胶法合成了掺杂Pt(IV)离子的二氧化钛，并通过透析纳入溶胶纯化过程。通过紫外光照射将掺杂的Pt(IV)离子还原，得到透明的Pt-TiO溶胶，其中Pt(0)作为析氢的助催化剂。以甲醇作为牺牲试剂，在紫外光照射下评估了Pt-TiO溶胶的析氢活性。紫外光照射10小时后，0.05原子%的Pt-TiO溶胶仍保持溶胶状态，无沉淀。光照10小时后产生的氢气量为1195 μmol，周转数（TON）为664.1，周转频率（TOF）为66.4 h，表观量子产率（AQY）为0.86%。从分子水平上看，溶胶-凝胶合成法被认为会使Pt离子掺杂在TiO颗粒内部，在Pt(IV)离子的紫外还原过程中，通过抑制由于Pt(0)聚集而导致的颗粒生长，保持高分散性。这些结果表明，Pt-TiO光催化剂具有很高的可再生能源因子，因为它可以在室温下合成，并且通过充分利用溶胶-凝胶法抑制了Pt-TiO颗粒的聚集。
