NiFe双氢纳米粒子有效提高BiVO4光阳极光电化学水分解性能

doi:10.1016/S1872-2067(17)62987-5

催化学报 ›› 2018, Vol. 39 ›› Issue (4): 613-618.DOI: 10.1016/S1872-2067(17)62987-5

NiFe双氢纳米粒子有效提高BiVO₄光阳极光电化学水分解性能

王其召, 牛腾娇, 王磊, 黄静伟, 佘厚德

西北师范大学化学化工学院, 甘肃兰州 730070

收稿日期:2017-12-03 修回日期:2017-12-30 出版日期:2018-04-18 发布日期:2018-04-08
通讯作者: 王其召
基金资助:
国家自然科学基金（21663027，51262028，21261021）；甘肃省科技支撑项目（1504GKCA027）；西北师范大学创新团队（NWNULKQN-15-2）.

NiFe layered double-hydroxide nanoparticles for efficiently enhancing performance of BiVO₄ photoanode in photoelectrochemical water splitting

Qizhao Wang, Tengjiao Niu, Lei Wang, Jingwei Huang, Houde She

College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China

Received:2017-12-03 Revised:2017-12-30 Online:2018-04-18 Published:2018-04-08
Contact: 10.1016/S1872-2067(17)62987-5
Supported by:
This work was supported by the National Natural Science Foundation of China (21663027, 51262028, 21261021), the Science and Technology Support Project of Gansu Province (1504GKCA027), the Program for the Young Innovative Talents of Longyuan, the Program for Innovative Research Team (NWNULKQN-15-2) and the Undergraduate Academic Innovative Research Team of Northwest Normal University.

摘要/Abstract

摘要：

近年来，太阳能驱动的光电化学水分解作为一种高效、环保、可持续的技术，已经引起了广泛的关注.为了更好地使用光电化学技术将太阳能转化为化学能，至关重要的是提高光电极材料的光吸收和光转化效率.BiVO₄禁带宽度（E_g=2.4-2.5eV）小，具有很好的可见光响应能力，因此BiVO₄光电极材料引起了广泛关注.但是，当单独BiVO₄作为光电阳极材料时，电子-空穴对分离弱、载流子传输慢，从而使BiVO₄不能很好地在光电化学水分解中发挥作用.为了缓解或解决此类限制性因素，本课题组通过水热法合成了NiFe双氢纳米粒子，并将其负载于BiVO₄电极表面，光电催化分解水实验表明其产氢效率得到大幅度提高.同时制备了Ni（OH）₂/BiVO₄和Fe（OH）₂/BiVO₄电极并用于研究NiFe/BiVO₄电极的反应机理.在上文基础上，本文采用电子扫描电镜（SEM）、高分辨投射电镜（HRTEM）、X射线衍射（XRD）、紫外可见漫反射（UV-Vis DRS）等表征手段和线性扫描伏安法（LSV）和电流时间（I-t）等对其光电化学活性进行了测试，研究了NiFe/BiVO₄电极在发生水氧化时的反应机理.
SEM结果表明，Ni（OH）₂是以纳米片组成的纳米球负载于多孔BiVO₄表面；而当Fe（OH）₂负载于BiVO₄表面时，BiVO₄的纳米尺寸减小；NiFe-LDH纳米粒子负载于BiVO₄表面时，可以明显看见BiVO₄纳米颗粒表面包裹着一层更小的纳米粒子.这证明了Ni（OH）₂，Fe（OH）₂和NiFe-LDH纳米粒子均成功负载于BiVO₄表面.这也得到HRTEM结果的确认.UV-Vis DRS结果表明NiFe-LDH纳米粒子能有效拓宽BiVO₄的吸收边，从而增加对可见光的吸收，增加了对光的利用率.
LSV测试结果表明，暗反应条件下Ni（OH）₂/BiVO₄比NiFe/BiVO₄和Fe（OH）₂/BiVO₄电极的起始电位更低，说明Ni（OH）₂有更好的传输电子性能；而在光照条件下，在同一电位时NiFe/BiVO₄比Ni（OH）₂/BiVO₄和Fe（OH）₂/BiVO₄电极的光电流值更高.值得注意的是，此时Ni（OH）₂/BiVO₄比Fe（OH）₂/BiVO₄电极的光电流值低，这又说明Fe（OH）₂比Ni（OH）₂对光更敏感.因此当NiFe-LDH纳米粒子负载于BiVO₄表面时，不仅提高了BiVO₄光电极的光吸收效率，而且加速了载流子的传输从而抑制了光生电子-空穴的复合，使反应过程中的量子效率得到提高.

关键词: NiFe双氢纳米粒子, BiVO₄光阳极, 光电化学水分解, 光电催化

Abstract:

A bismuth vanadate (BiVO₄) photoanode with a cocatalyst consisting of NiFe layered double-hydroxide (NiFe-LDH) nanoparticles was fabricated for photoelectrochemical (PEC) water splitting. NiFe-LDH nanoparticles, which can improve light-absorption capacities and facilitate efficient hole transfer to the surface, were deposited on the surface of the BiVO₄ photoanode by a hydrothermal method. All the samples were characterized using X-ray diffraction, scanning electron microscopy, and diffuse-reflectance spectroscopy. Linear sweep voltammetry and current-time plots were used to investigate the PEC activity. The photocurrent response of NiFe-LDH/BiVO₄ at 1.23 V vs the reversible hydrogen electrode was higher than those of Ni(OH)₂/BiVO₄, Fe(OH)₂/BiVO₄ and pure BiVO₄ electrodes under visible-light illumination. NiFe-LDH/BiVO₄ also gave a superior PEC hydrogen evolution performance. Furthermore, the stability of the NiFe-LDH/BiVO₄ photoanode was excellent compared with that of the bare BiVO₄ photoanode, and offers a novel method for solar-assisted water splitting.

Key words: NiFe layered double-hydroxide nanoparticles, BiVO₄ photoanode, Photoelectrochemical water splitting, Photoelectrocatalysis

王其召, 牛腾娇, 王磊, 黄静伟, 佘厚德. NiFe双氢纳米粒子有效提高BiVO₄光阳极光电化学水分解性能[J]. 催化学报, 2018, 39(4): 613-618.

Qizhao Wang, Tengjiao Niu, Lei Wang, Jingwei Huang, Houde She. NiFe layered double-hydroxide nanoparticles for efficiently enhancing performance of BiVO₄ photoanode in photoelectrochemical water splitting[J]. Chinese Journal of Catalysis, 2018, 39(4): 613-618.

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NiFe双氢纳米粒子有效提高BiVO₄光阳极光电化学水分解性能

NiFe layered double-hydroxide nanoparticles for efficiently enhancing performance of BiVO₄ photoanode in photoelectrochemical water splitting

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