Metal (Ni2+/Co2+) sulfides modified BiVO4 for effective improvement in photoelectrochemical water splitting.
Metal (Ni2+/Co2+) sulfides modified BiVO4 for effective improvement in photoelectrochemical water splitting.
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DOI：
10.1016/j.jcis.2019.04.038
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发表时间：
2019-08
影响因子：
9.9
通讯作者：
H. She;Man Jiang;Pengfei Yue;Jingwei Huang;Lei Wang;Jianzhang Li;G. Zhu;Qizhao Wang
中科院分区：
文献类型：
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作者：
H. She;Man Jiang;Pengfei Yue;Jingwei Huang;Lei Wang;Jianzhang Li;G. Zhu;Qizhao Wang
BiVO4 光电催化 (PEC) 水分解的性能通常受到反应动力学的限制。在这项工作中，将NiS和CoS纳米球分别负载在BiVO4薄膜（NiS/BiVO4和CoS/BiVO4复合材料）上以改善其PEC水分解的反应动力学。通过 XRD、SEM、TEM、PL 和 UV-DRS 对这些复合材料的物理和化学性能进行了表征。通过LSV、i-t、EIS和IPCE测试验证了样品的光电性能。复合材料的形成可以有效阻止载流子复合，从而加速电子和空穴的分离。 NiS/BiVO4和CoS/BiVO4在1.23V vs. RHE下在光照下分别能达到2.1mAcm−2和2.7mAcm−2的光电流，分别是BiVO4(1.2mAcm−2)的1.75倍和2.25倍。 NiS/BiVO4和CoS/BiVO4光阳极的产氢量分别是BiVO4光阳极的4.7和7.3倍。
The performance of BiVO4for photoelectrocatalytic (PEC) water decomposition is commonly limited by reaction kinetics. In this work, NiS and CoS nanospheres were respectively loaded on BiVO4thin films (NiS/BiVO4and CoS/BiVO4composites) to improve its reaction kinetics for PEC water decomposition. Both physical and chemical properties of these composites were characterized by XRD, SEM, TEM, PL and UV-DRS. The photoelectric properties of the samples were verified by testing LSV, i-t, EIS and IPCE. The formation of the composites can effectively prevent the recombination of carriers and consequently accelerate the separation of electrons and holes. NiS/BiVO4and CoS/BiVO4can reach photocurrent of 2.1 mA cm−2and 2.7 mA cm−2under light respectively, at 1.23 V vs. RHE, which are 1.75 times and 2.25 times that of BiVO4(1.2 mA cm−2). The hydrogen production of the NiS/BiVO4and CoS/BiVO4photoanodes was 4.7 and 7.3 times higher than that of BiVO4photoanode, respectively.