WO3/ZnIn2S4 heterojunction photoanodes grafting silane molecule for efficient photoelectrochemical water splitting
WO3/ZnIn2S4 heterojunction photoanodes grafting silane molecule for efficient photoelectrochemical water splitting
复制标题
WO3/ZnIn2S4异质结光阳极接枝硅烷分子实现高效光电化学水分解
DOI：
10.1016/j.electacta.2020.137017
复制
发表时间：
2020
影响因子：
6.6
通讯作者：
Huajun Zheng
中科院分区：
文献类型：
--
作者：
Xiaowei Shi;Fuyuan Dong;Chao Dai;Xiaoying Ye;Ping Yang;Lingxia Zheng;Huajun Zheng
设计和制造具有有效电荷分离和合适活性位点的半导体光阳极用于太阳能转换无疑是克服环境危机和能源短缺的一种有前途的替代方案。本文报道了一种异质结WO 3/ZnIn 2S 4（WO 3/ZIS）接枝硅烷分子（N-（2-氨乙基）-3-氨丙基三甲氧基硅烷，AESI）作为光阳极，其光电化学（PEC）效率提高，可实现高效的水分解。通过水热法在掺氟氧化锡（FTO）玻璃表面生长WO 3纳米片，然后在WO 3表面沉积ZIS，制备了Ⅱ型WO 3/ZIS异质结构。然后采用化学水浴法将硅烷分子固定在WO 3/ZIS上。结果表明，形成WO 3/ZIS异质结构和接枝硅烷分子将大大提高电荷分离效率和转移迁移率。此外，硅烷分子还为水的氧化反应提供了足够的活性位。结果，所获得的WO 3/ZIS/AESI光阳极在模拟太阳光照射下表现出1.51 mA cm-2的光电流密度，比WO 3的光电流密度提高了74.6%。此外，WO 3和WO 3/ZIS/AESI在365 nm处的入射光-电流转换效率（IPCE）分别从39.1%提高到50.6%。该方法为水裂解光电极材料的制备提供了新的思路。
Designing and fabricating semiconductor photoanodes with efficient charge separation and appropriate active sites for solar energy conversion is indubitably a promising alternative to overcome the environmental crisis and energy shortage. Herein, we report a heterojunction WO3/ZnIn2S4(WO3/ZIS) grafting silane molecule (N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, AESI) as photoanode with boosted photoelectrochemical (PEC) efficiency toward highly efficient water splitting. The type Ⅱ WO3/ZIS heterostructure are firstly synthesized by hydrothermal growth of WO3nanosheets on the surface of fluorine-doped tine oxide (FTO)-coated glass, followed by depositing ZIS onto WO3surface. After that, silane molecules are anchored on WO3/ZISviachemical water bath method. It is demonstrated that forming WO3/ZIS heterostructure and grafting silane molecules would greatly enhance the charge separation efficiency and transfer mobility. In addition, silane molecules would offer enough reactive sites for water oxidization reaction. As a result, the obtained WO3/ZIS/AESI photoanode exhibits a photocurrent density of 1.51 mA cm−2under simulated solar light irradiation, to be 74.6% enhanced than that of WO3. Moreover, the incident photon-to-current conversion efficiency (IPCE) at 365 nm increases from 39.1% to 50.6% for WO3and WO3/ZIS/AESI, respectively. The present strategy provides inspiration for preparation of photoelectrode materials in water splitting.