Synergistic effects of P-doping and a MnO2 cocatalyst on Fe2O3 nanorod photoanodes for efficient solar water splitting
Synergistic effects of P-doping and a MnO2 cocatalyst on Fe2O3 nanorod photoanodes for efficient solar water splitting
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P 掺杂和 MnO2 助催化剂对 Fe2O3 纳米棒光阳极的协同效应，实现高效太阳能水分解
DOI：
10.1039/c8ta00556g
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发表时间：
2018
影响因子：
11.9
通讯作者：
Bi Yingpu
中科院分区：
文献类型：
--
作者：
Rui Qiang;Wang Lei;Zhang Yajun;Feng Chenchen;Zhang Beibei;Fu Shurong;Guo Huilin;Hu Hongyan;Bi Yingpu
在此，我们设计并制造了用p掺杂和MnO2析氧助催化剂修饰的赤铁矿（Fe2O3）纳米棒光阳极，用于光电化学（PEC）水分解。该新型MnO2/P:Fe2O3光阳极具有明显增强的PEC水氧化活性，其光电流密度比原始Fe2O3高约5倍。PEC性能的显著提高主要归功于p掺杂和MnO2助催化剂的协同作用。更具体地说，Mott-Schottky和Nyquist图清楚地揭示了p掺杂不仅可以有效地增加载流子密度，还可以提高Fe2O3光阳极的电子和空穴转移迁移率。此外，MnO2助催化剂改性可以显著促进电荷分离和光阳极/电解质界面的空穴传输，从而进行水氧化。因此，这些演示可能为设计和制造用于太阳能转换的高效fe2o3基PEC系统提供另一种策略。
Herein, we design and fabricate hematite (Fe2O3) nanorod photoanodes modified with P-doping and a MnO2 oxygen evolution cocatalyst for photoelectrochemical (PEC) water splitting. This novel MnO2/P:Fe2O3 photoanode exhibited a remarkably enhanced PEC water oxidation activity, and its photocurrent density is approximately 5-fold higher than that of pristine Fe2O3. The significant improvement of PEC performance is mainly attributed to the synergistic effects of P-doping and MnO2 cocatalysts. More specifically, the Mott–Schottky and Nyquist plots clearly reveal that P-doping could not only effectively increase the density of charge carriers but also enhance the electron and hole transfer mobilities of Fe2O3 photoanodes. Furthermore, the MnO2 cocatalyst modification can significantly facilitate charge separation and hole transport to the photoanode/electrolyte interface for water oxidation. Therefore, these demonstrations may provide an alternate strategy for designing and fabricating highly efficient Fe2O3-based PEC systems for solar energy conversion.