CAJ | 학술논문

综述了近几年改善TiO2光催化分解水制氢的方法措施.向水中添加供电子物质可减少光生电子与空穴的复合,添加碳酸盐或碘化物有利于光生电子与空穴分离;TiO2表面沉积适量的金属颗粒也有利于实现电子和空穴分离,但沉积太多的金属颗粒不但降低 TiO2对光的吸收而且还可能成为光生电荷复合的中心;掺杂合适的金属离子通过形成杂质能级可拓宽TiO2的吸光范围至可见光,掺杂非金属元素使TiO2的带隙(Eg)变窄,从而使TiO2的吸光红移更明显,但掺杂离子有可能成为光生电荷复合的中心;染料敏化或半导体复合有利于实现电荷分离提高光电转换效率.将多种修饰方法有机结合起来制取氢是目前的一个研究方向,最后分析了未来的研究重点.
종술료근궤년개선TiO2광최화분해수제경적방법조시.향수중첨가공전자물질가감소광생전자여공혈적복합,첨가탄산염혹전화물유리우광생전자여공혈분리;TiO2표면침적괄량적금속과립야유리우실현전자화공혈분리,단침적태다적금속과립불단강저 TiO2대광적흡수이차환가능성위광생전하복합적중심;참잡합괄적금속리자통과형성잡질능급가탁관TiO2적흡광범위지가견광,참잡비금속원소사TiO2적대극(Eg)변착,종이사TiO2적흡광홍이경명현,단참잡리자유가능성위광생전하복합적중심;염료민화혹반도체복합유리우실현전하분리제고광전전환효솔.장다충수식방법유궤결합기래제취경시목전적일개연구방향,최후분석료미래적연구중점.
The progress of improvement techniques in photocatalytic water-splitting using TiO2 for hydrogen production is reviewed. Adding electron donors can reduce the recombination of photo-generated conduction band electrons and valence band holes. Addition of carbonate salts or iodide can enhance the photo-excited electron/hole separation. Loading of appropriate metal particles on the surface of TiO2 can improve photo-excited charge separation. However, depositing too many metal particles might reduce photon absorption by TiO2 and might also become electron/hole recombination centers. Appropriate metal ion doping on TiO2 can expand its photo-response to visible region through formation of impurity energy levels. Anion doping causes the narrow of the band gap of TiO2 and is more effective than metal ion doping for red shift. But, doped ions tend to become recombination centers. Dye sensitization or semiconductor composition can result in efficient charge separation and improve the photocatalytic efficiency. Coupling different techniques is one of the directions of the future research for hydrogen production;potential new directions required in this area of research are highlighted.