Crystal Reconstruction of Mo:BiVO4: Improved Charge Transport for Efficient Solar Water Splitting,Advanced Functional Materials

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Crystal Reconstruction of Mo:BiVO4: Improved Charge Transport for Efficient Solar Water Splitting
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-09-16 , DOI: 10.1002/adfm.202208196
Yoo Jae Jeong _{1,

2} , Dong Hyun Seo _{1,

2} , Ji hyun Baek ₃ , Min Je Kang _{1,

2} , Bit Na Kim _{1,

2} , Sung kyu Kim ₄ , Xiaolin Zheng ₃ , In Sun Cho _{1,

2}

Affiliation

A multifaceted Mo:BiVO₄ (mf-BVO) photoanode is grown on F-doped-SnO₂ substrates via achemical bath deposition, and the crystal reconstruction process of mf-BVO is found to boost the charge transport efficiency significantly for photoelectrochemical (PEC) water splitting. The mf-BVO exhibits columnar grains with an uncommon (121) texture with high-index facets such as (112), (020), (132), and (204). The texture and high-index facets facilitate rapid surface melting and grain fusion during thermal annealing, thus leading to crystal reconstructed micron-sized BVO grains (cr-BVO). The cr-BVO has a photocurrent density ≈50 times larger than that of mf-BVO. The reason is identified as the significantly improved charge transport efficiency resulting from the dopant activation (increased carrier concentration) and bulky grains (fewer defects). Additionally, the cr-BVO exhibits improved photocorrosion resistance compared to the nanoparticle-based BVO. After coating the oxygen evolution catalyst, the photocurrent density of cr-BVO is further increased to 4.4 mA cm⁻² for water oxidation reaction at 1.23 V versus the reversible hydrogen electrode, maintaining a high and stable faradaic efficiency of over 88% for 24 h. These results demonstrate that crystal reconstruction is a facile and effective pathway to improve the charge transport efficiency, opening a new avenue for developing efficient photoelectrodes for PEC water splitting.

中文翻译：

Mo:BiVO4 的晶体重构：改进的电荷传输以实现高效的太阳能水分解

多面 Mo:BiVO ₄ (mf-BVO) 光阳极生长在 F 掺杂的 SnO _2上通过化学浴沉积制备基板，发现 mf-BVO 的晶体重构过程可显着提高光电化学 (PEC) 水分解的电荷传输效率。mf-BVO 显示具有不常见的 (121) 结构的柱状晶粒，具有高折射率刻面，例如 (112)、(020)、(132) 和 (204)。纹理和高折射率小面促进热退火过程中的快速表面熔化和晶粒融合，从而导致晶体重构的微米级 BVO 晶粒 (cr-BVO)。cr-BVO 的光电流密度比 mf-BVO 大 ≈50 倍。原因被确定为由掺杂剂激活（增加载流子浓度）和大颗粒（更少缺陷）导致的电荷传输效率显着提高。此外，与基于纳米颗粒的 BVO 相比，cr-BVO 表现出更高的耐光腐蚀能力。涂覆析氧催化剂后，cr-BVO的光电流密度进一步增加至4.4 mA cm^-2相对于可逆氢电极在 1.23 V 下进行水氧化反应，在 24 小时内保持超过 88% 的高且稳定的法拉第效率。这些结果表明，晶体重构是提高电荷传输效率的一种简便有效的途径，为开发用于 PEC 水分解的高效光电极开辟了一条新途径。

更新日期：2022-09-16

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