钛掺杂与氧空位协同作用提高氧化铁纳米棒阵列的光解水性能
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- 英文论文题名：Synergic effects of Ti doping and oxygen vacancy on the photoelectrochemical performance of α-Fe_2O_3 nanorod arrays
- 论文作者：纪梅 ; 齐利民
- 英文论文作者：Mei Ji ; Limin Qi ; College of Chemistry and Molecular Engineering ; Peking University
- 年：2016
- 作者机构：北京大学化学与分子工程学院;
- 论文关键词：氧化铁 ; 钛掺杂 ; 氧空位 ; 光电化学分解水
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十七分会：光化学
- 语种：中文
- 分类号：O614.811;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十七分会 ; 光化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：566k
- 原文格式：D
- 会议级别：全国
摘要
光电化学分解水可以将太阳能转化为氢能,便于能量的储存和输运。α-Fe_2O_3是很有发展潜力的光电阳极材料,具有合适的带隙和能带位置,吸收可见光,储量丰富、价格低廉且化学稳定性好。研究表明,通过金属掺杂和氧空位掺杂可以提高氧化铁的光解水性能[1,2]。通过考察煅烧气氛和煅烧温度的影响,我们研究了Ti掺杂与氧空位对氧化铁纳米阵列光电化学性质的协同作用。原位Ti掺杂的FeOOH纳米棒阵列经过空气气氛煅烧后可转化为Ti掺杂的α-Fe_2O_3纳米棒阵列(Fig.1a)。无掺杂α-Fe2O3纳米棒阵列经过氩气煅烧后,光电流密度没有显著的升高。而Ti掺杂α-Fe_2O_3纳米棒阵列经过氩气煅烧后,1.23 V vs RHE处的光电流密度由0.78 m A/cm~2提升到1.80 m A/cm~2(Fig.1b)。该结果表明,Ti掺杂可以有效的促进α-Fe_2O_3纳米棒阵列中氧空位的生成,同时两步法煅烧法可以显著提高样品的光解水性能。
Photoelectrochemical(PEC) water splitting is a promising strategy for converting solar energy to chemical fuels such as hydrogen. Hematite(α-Fe_2O_3) has emerged as a prototype photoanode for PEC water oxidation. It has been reported that elemental doping and oxygen vacancy can enhance its PEC performance. In this work, we investigated the synergic effects of Ti doping and oxygen vacancy on the enhancement of the PEC performance of α-Fe_2O_3 nanorod arrays. It has been demonstrated that Ti doping is able to promote the generation of oxygen vacancy inside α-Fe_2O_3 nanoarrays and a two-step annealing is desirable for obtaining enhanced PEC performance.
Photoelectrochemical(PEC) water splitting is a promising strategy for converting solar energy to chemical fuels such as hydrogen. Hematite(α-Fe_2O_3) has emerged as a prototype photoanode for PEC water oxidation. It has been reported that elemental doping and oxygen vacancy can enhance its PEC performance. In this work, we investigated the synergic effects of Ti doping and oxygen vacancy on the enhancement of the PEC performance of α-Fe_2O_3 nanorod arrays. It has been demonstrated that Ti doping is able to promote the generation of oxygen vacancy inside α-Fe_2O_3 nanoarrays and a two-step annealing is desirable for obtaining enhanced PEC performance.
引文
[1]Pu A.;Deng J.;Li M.;Gao J.;Zhang H.;Hao Y.;Zhong J.;Sun X.J.Mater.Chem.A,2014,2:2491.
[2]Ling Y.;Wang G.;Reddy J.;Wang C.;Zhang J.;Li Y.Angew.Chem.Int.Ed.2012,51:4074.
[2]Ling Y.;Wang G.;Reddy J.;Wang C.;Zhang J.;Li Y.Angew.Chem.Int.Ed.2012,51:4074.