In situ synthesis of FeP-decorated Ti-Fe2O3: an effective strategy to improve the interfacial charge transfer in the photoelectrochemical water oxidation reaction
In situ synthesis of FeP-decorated Ti-Fe2O3: an effective strategy to improve the interfacial charge transfer in the photoelectrochemical water oxidation reaction
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原位合成 FeP 修饰的 Ti-Fe2O3：改善光电化学水氧化反应中界面电荷转移的有效策略
DOI：
10.1039/c9cy01192g
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发表时间：
2019
影响因子：
5
通讯作者：
Xie Tengfeng
中科院分区：
文献类型：
--
作者：
Bu Qijing;Li Shuo;Wu Qiannan;Lin Yanhong;Wang Dejun;Zou Xiaoxin;Xie Tengfeng
在半导体上修饰廉价的助催化剂以加速光电阳极/电解质界面处的电荷转移，同时在本体光电阳极中具有良好的电荷转移，是构建低成本和高效的PEC太阳能转换装置的优先事项之一。然而，当将助催化剂与半导体集成时，通常难以在本体中和在光阳极/电解质界面处满足出色的电荷转移。本工作通过简单的低温磷化反应原位合成了FeP修饰的Ti-Fe_2 O_3复合材料，该复合材料与FeP之间具有良好的界面接触。结果表明，FeP的原位沉积不仅通过提高光电阳极的电导率降低了光电阳极中的电荷转移电阻，而且还加速了光电阳极/电解质界面的电荷转移。基于上述优点，新型FeP/Ti-Fe 2 O3在1.23 V vs. RHE下表现出高达3.9 mA cm-2的出色光电流密度;同时，与Ti-Fe 2 O3（0.98 V vs. RHE）相比，FeP/Ti-Fe 2 O3的起始电位阴极移动至0.88 V vs. RHE。这项工作为构建具有优异界面电荷转移的助催化剂改性光阳极铺平了一条简单的道路，并提供了一种低成本且有前途的助催化剂，可应用于光电化学水氧化反应。
Modifying inexpensive cocatalysts on semiconductors to accelerate the charge transfer at the photoanode/electrolyte interface, which possess good charge transfer in the bulk photoanode simultaneously, is priority among priorities in constructing low-cost and efficient PEC solar energy conversion devices. However, it is often difficult to satisfy outstanding charge transfer both in the bulk and at the photoanode/electrolyte interface when integrating cocatalysts with semiconductors. In our work, we synthesized FeP-decorated Ti–Fe2O3in situ through simple low-temperature phosphidation, which possessed good interfacial contact between Ti–Fe2O3 and FeP. The results demonstrated that the in situ deposition of FeP not only reduced the charge transfer resistance in the bulk photoanode by improving the electrical conductivity, but also accelerated the charge transfer at the photoanode/electrolyte interface. Based on the above advantages, the novel FeP/Ti–Fe2O3 exhibited splendid photocurrent density as high as 3.9 mA cm−2 at 1.23 V vs. RHE; meanwhile, the onset potential of FeP/Ti–Fe2O3 shifted cathodically to 0.88 V vs. RHE in comparison with that of Ti–Fe2O3 (0.98 V vs. RHE). This work paves a simple path to construct a cocatalyst-modified photoanode with excellent interfacial charge transfer and offers a low-cost and promising cocatalyst that can be applied in the photoelectrochemical water oxidation reaction.