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Multi-layer monoclinic BiVO4 with oxygen vacancies and V4+ species for highly efficient visible-light photoelectrochemical applications
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2017-09-14 , DOI: 10.1016/j.apcatb.2017.09.031
Jin-Meng Wu , Ying Chen , Lun Pan , Peihong Wang , Ya Cui , DeChao Kong , Li Wang , Xiangwen Zhang , Ji-Jun Zou

The utilization of solar energy into photoelectrochemical (PEC) water splitting is a popular approach to store the sustainable energy and minimize the dependence of fossil fuels. Herein, multi-layer BiVO4 films were synthesized by multi-cycle electrodeposition following by annealing at high temperature. Multi-layer BiVO4 films have monoclinic scheelite structure, and the morphology is changed from densely compact film to sponge-like network, and then bulk structure with the increase of electro-deposited layers. X-ray photoelectron spectra indicate the presence of abundant oxygen vacancies and V4+ species in multi-layer BiVO4, especially for 3-layer one. For visible-light PEC performance, 3-layer BiVO4 shows the highest photocurrent among the samples, i.e. up to 5.80 mA/cm2 in sulfite oxidation and 1.79 mA/cm2 in water splitting at 1.23 V versus a reverse hydrogen electrode (RHE) under 1 sun irradiation (100 mW/cm2), with very high IPCE achieved nearly 83% and 25% (at 420 nm), respectively. The extremely high PEC performance of 3-layer BiVO4 is attributed to its morphology of sponge-like network and the modulated band structure by the oxygen vacancies and V4+ species. Moreover, the multi-layer BiVO4 also shows very high photostability. This work provides a multi-layer-construction method for highly visible-light-active PEC anodes for practical applications.

中文翻译:

具有氧空位和V 4+物种的多层单斜BiVO 4,用于高效可见光光电化学应用

将太阳能用于光电化学(PEC)水分解是一种流行的方法,可以存储可持续能源并最大程度地减少对化石燃料的依赖。在此,通过在高温下退火之后的多循环电沉积来合成多层BiVO 4膜。多层BiVO 4薄膜具有单斜白钨矿结构,其形貌由致密的薄膜变为海绵状网络,然后随着电沉积层的增加而形成整体结构。X射线光电子能谱表明在多层BiVO 4中存在大量的氧空位和V 4+物种,特别是对于三层BiVO 4。为了实现可见光PEC性能,三层BiVO 4显示了样品中最高的光电流,在1个太阳辐射(100 mW / cm 2)下,反向氢电极(RHE)相比,在亚硫酸盐氧化中高达5.80 mA / cm 2,在1.23 V下的水分解中高达1.79 mA / cm 2。IPCE很高时,在420 nm时分别达到了近83%和25%。3层BiVO 4具有极高的PEC性能,这归因于其海绵状网络的形态以及氧空位和V 4+物种对带结构的调节。此外,多层BiVO 4还显示出很高的光稳定性。这项工作为实际应用中的高可见光活性PEC阳极提供了一种多层构造方法。
更新日期:2017-09-14
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