Elucidating the optical, electronic, and photoelectrochemical properties of p-type copper vanadate (p-Cu5V2O10) photocathodes,Journal of Materials Chemistry A

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Elucidating the optical, electronic, and photoelectrochemical properties of p-type copper vanadate (p-Cu5V2O10) photocathodes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-12 , DOI: 10.1039/d0ta04250a
Angang Song _{1,

2,

3,

4,

5} , Sean P. Berglund _{1,

2,

3,

4} , Abdelkrim Chemseddine _{1,

2,

3,

4} , Dennis Friedrich _{1,

2,

3,

4} , Fatwa F. Abdi _{1,

2,

3,

4} , Roel van de Krol _{1,

2,

3,

4,

5}

Affiliation

P-type copper vanadate (Cu₅V₂O₁₀) photoelectrodes made by spray pyrolysis were developed and evaluated as a potential photocathode material for photoelectrochemical (PEC) water splitting. Using fluorine-doped tin oxide as a substrate, highly phase-pure p-Cu₅V₂O₁₀ thin films were obtained after annealing at 550 °C for 4 hours in air. Cu₅V₂O₁₀ has a small bandgap energy in the range of 1.8–2.0 eV, allowing it to absorb visible light and making it potentially interesting for solar water splitting applications. The p-Cu₅V₂O₁₀ films were characterized by photoelectrochemical techniques in order to provide insight into the critical PEC properties such as the flat-band potential, chemical stability, and incident photon-to-current efficiency (IPCE). The best-performing films showed a photocurrent density of up to 0.5 mA cm⁻² under AM1.5 simulated sunlight, and an IPCE value up to 14% for 450 nm light at 0.8 V_RHE with H₂O₂ as an electron scavenger. Despite the narrow band gap and suitable conduction band edge position for PEC H₂ production, these p-type films were unstable under constant illumination in aqueous electrolyte (pH 6.8) due to the reduction and dissolution of Cu. Based on our findings, the suitability of Cu₅V₂O₁₀ as a photocathode material for photoelectrochemical water splitting is critically discussed.

中文翻译：

阐明p型钒酸铜（p-Cu5V2O10）光电阴极的光学，电子和光电化学性质

研发了通过喷雾热解法制备的P型钒酸铜（Cu ₅ V ₂ O ₁₀）光电极，并将其评估为用于光电化学（PEC）水分解的潜在光阴极材料。使用掺杂氟的氧化锡作为基材，在空气中于550°C退火4小时后，获得了高相纯p-Cu ₅ V ₂ O ₁₀薄膜。Cu ₅ V ₂ O ₁₀在1.8–2.0 eV的范围内具有较小的带隙能量，从而使其能够吸收可见光，从而有可能成为太阳能分水应用中的热点。p-Cu ₅ V ₂ O ₁₀薄膜通过光电化学技术进行表征，以提供对关键PEC特性（如平带电势，化学稳定性和入射光子电流效率（IPCE））的洞察力。性能最佳的薄膜在AM1.5模拟阳光下显示的光电流密度最高为0.5 mA cm ^-2，在0.8 V _RHE且H ₂ O ₂为电子清除剂的情况下，对于450 nm的光，IPCE值最高为14％。尽管具有窄的带隙和适合的PEC H ₂产生的导带边缘位置，但由于Cu的还原和溶解，这些p型膜在水电解质（pH 6.8）中恒定照射下仍不稳定。根据我们的发现，Cu ₅的适用性关键地讨论了V ₂ O ₁₀作为用于光电化学水分解的光阴极材料。

更新日期：2020-06-30

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