Preparation of vertically aligned WO3 nanoplate array films based on peroxotungstate reduction reaction and their excellent photoelectrocatalytic performance
Preparation of vertically aligned WO3 nanoplate array films based on peroxotungstate reduction reaction and their excellent photoelectrocatalytic performance
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DOI：
10.1016/j.apcatb.2016.09.045
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发表时间：
2017-03
影响因子：
22.1
通讯作者：
Qingyi Zeng;Jinhua Li;Jing Bai;Xuejin Li;Ligang Xia;B. Zhou
中科院分区：
文献类型：
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作者：
Qingyi Zeng;Jinhua Li;Jing Bai;Xuejin Li;Ligang Xia;B. Zhou
在这里，我们开发了一种新的，简单的，可控的和可扩展的方法的基础上过氧钨酸盐还原反应，以制备垂直排列的WO 3纳米片阵列（NPA）薄膜优先暴露的高活性（002）方面用于高效的光电催化（PEC）应用。该方法采用乙醇缓慢可控还原过氧钨酸盐的方法，在草酸盐的封端作用下，直接在掺氟氧化锡衬底上均匀有序地合成正交晶系WO 3自由基dotH 2 O NPA薄膜，然后通过煅烧将WO 3自由基dotH 2 O NPA薄膜转化为单斜晶系WO 3 NPA薄膜.系统研究了合成温度、时间和草酸盐浓度对WO 3自由基dotH 2 O薄膜晶相和形貌的影响。在500 °C的最佳温度下退火的WO 3 NPA薄膜在AM 1.5G光照下，在0.1M Na 2SO 4中1.23 V vsRHE时表现出最高的水裂解电流密度为1.42 mA/cm 2。在400 nm处，Co-Pi共催化剂的修饰使电流密度稳定在1.95 mA/cm 2左右，光电转换效率为51%。WO 3 NPA膜还显示出优异的稳定性和效率（速率常数为1.08127 h-1），用于PEC降解亚甲基蓝。
Here, we developed a novel, facile, controllable and scalable method based on peroxotungstate reduction reaction to prepare vertically aligned WO3nanoplate array (NPA) films with preferentially exposed highly reactive (002) facets used in efficient photoelectrocatalytic (PEC) applications. In this method, a slow and controllable reduction of peroxotungstates by ethanol was used, which was the critical step to ensure the uniform and ordered synthesis of orthorhombic WO3radical dotH2O NPA films which assembled directly on F-doped tin oxide substrates under the capping effect of oxalate, and subsequently WO3radical dotH2O NPA films were converted into monoclinic WO3NPA films by calcination. The effects of synthetic temperature and time, and the concentration of oxalate on the crystalline phase and morphology of the WO3radical dotH2O films were studied systematically. The WO3NPA film annealed at an optimized temperature of 500 °C exhibited the highest water splitting current density of ∼1.42 mA/cm2at 1.23 V vs RHE in 0.1 M Na2SO4under AM 1.5 G illumination. It was further improved by decorating with a Co–Pi co-catalyst, which achieved a more stable current density of ∼1.95 mA/cm2with an incident photon-to-current conversion efficiency of ∼51% at 400 nm. The WO3NPA film also showed excellent stability and efficiency (rate constant ∼0.8127 h−1) for PEC degradation of methylene blue.