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High Water Oxidation Performance of W‐Doped BiVO4 Photoanodes Coupled to V2O5 Rods as a Photoabsorber and Hole Carrier
Solar RRL ( IF 6.0 ) Pub Date : 2018-05-18 , DOI: 10.1002/solr.201800089 Andreia T. Oliveira 1 , Mariandry Rodriguez 1 , Tatiana S. Andrade 1 , Helen E. A. de Souza 1 , José D. Ardisson 2 , Henrique S. Oliveira 3 , Luiz C. A. Oliveira 3 , Eudes Lorençon 4 , Adilson C. Silva 5 , Lucas L. Nascimento 6 , Antonio O. T. Patrocínio 6 , Márcio C. Pereira 1
Solar RRL ( IF 6.0 ) Pub Date : 2018-05-18 , DOI: 10.1002/solr.201800089 Andreia T. Oliveira 1 , Mariandry Rodriguez 1 , Tatiana S. Andrade 1 , Helen E. A. de Souza 1 , José D. Ardisson 2 , Henrique S. Oliveira 3 , Luiz C. A. Oliveira 3 , Eudes Lorençon 4 , Adilson C. Silva 5 , Lucas L. Nascimento 6 , Antonio O. T. Patrocínio 6 , Márcio C. Pereira 1
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Monoclinic BiVO4 is recognized as a promising photoanode for water oxidation, but its relatively wide bandgap energy (Eg ≈2.5 eV) and poor charge transport limit the light absorption (ηabs) and charge separation (ηsep) efficiencies, thus resulting in low photocurrents. To solve these drawbacks, here the ηabs × ηsep product has been decoupled by combining W‐doped BiVO4 and V2O5 rods (Eg ≈2.1 eV) for simultaneously increasing the light harvesting and the charge separation in photoanodes under back‐side illumination. In this strategy, V2O5 rods maximize the light absorption and hole transport throughout the W‐BiVO4 film, making more holes to achieve the V2O5/W‐BiVO4/H2O interface to trigger the water oxidation reaction with photocurrents as high as 6.6 mA cm−2 at 1.23 VRHE after 2 h reaction. Notably, under back‐side illumination, the W‐BiVO4/V2O5 photoanode exhibited ηabs × ηsep of 74.5 and 93.0% at 0.5 and 1.23 VRHE, respectively, the highest values reported up to date for BiVO4‐based photoelectrodes. This simple strategy brings us closer to develop efficient photoanodes for photoelectrochemical water splitting devices.
中文翻译：
W掺杂BiVO4光电阳极与V2O5棒耦合作为光吸收剂和空穴载体的高水氧化性能
单斜BiVO 4是公认的水氧化有希望的光电阳极，但其相对宽的带隙能量（Ë克≈2.5EV）和差的电荷传输限制的光吸收（η ABS）和电荷分离（η月）的效率，从而导致低光电流。为了解决这些缺点，这里的η ABS × η月产品已经通过组合W-掺杂BiVO解耦4和V 2 ø 5杆（Ë克≈2.1eV），以同时增加在背面照明下光阳极中的光收集和电荷分离。在此策略中，V 2 O 5棒使整个W-BiVO 4膜的光吸收和空穴传输最大化，从而制造更多的孔以实现V 2 O 5 / W-BiVO 4 / H 2 O界面触发水氧化反应反应2小时后，在1.23 V RHE下的光电流高达6.6 mA cm -2。值得注意的是，下背面照明时，W-BiVO 4 / V 2 ø 5光电阳极展出η ABS × η月74.5和0.5和的1.23V 93.0％RHE，分别，最高值报告最新为BiVO 4系光电极。这种简单的策略使我们更加接近于开发用于光电化学水分解装置的高效光阳极。
更新日期：2018-05-18
中文翻译：
W掺杂BiVO4光电阳极与V2O5棒耦合作为光吸收剂和空穴载体的高水氧化性能
单斜BiVO 4是公认的水氧化有希望的光电阳极，但其相对宽的带隙能量（Ë克≈2.5EV）和差的电荷传输限制的光吸收（η ABS）和电荷分离（η月）的效率，从而导致低光电流。为了解决这些缺点，这里的η ABS × η月产品已经通过组合W-掺杂BiVO解耦4和V 2 ø 5杆（Ë克≈2.1eV），以同时增加在背面照明下光阳极中的光收集和电荷分离。在此策略中，V 2 O 5棒使整个W-BiVO 4膜的光吸收和空穴传输最大化，从而制造更多的孔以实现V 2 O 5 / W-BiVO 4 / H 2 O界面触发水氧化反应反应2小时后，在1.23 V RHE下的光电流高达6.6 mA cm -2。值得注意的是，下背面照明时，W-BiVO 4 / V 2 ø 5光电阳极展出η ABS × η月74.5和0.5和的1.23V 93.0％RHE，分别，最高值报告最新为BiVO 4系光电极。这种简单的策略使我们更加接近于开发用于光电化学水分解装置的高效光阳极。
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