Carbon quantum dots based charge bridge between photoanode and electrocatalysts for efficiency water oxidation
Carbon quantum dots based charge bridge between photoanode and electrocatalysts for efficiency water oxidation
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基于碳量子点的光电阳极和电催化剂之间的电荷桥，用于高效水氧化
DOI：
10.1016/j.electacta.2018.04.052
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发表时间：
2018-05-20
影响因子：
6.6
通讯作者：
Han, Weihua
中科院分区：
文献类型：
--
作者：
Jiang, Xiao;Zhang, Zemin;Han, Weihua
金属氧化物半导体由于其丰富的资源和优良的稳定性，在光电化学分解水方面受到广泛关注。然而，由于即使用电催化剂改性，电子-空穴对的高复合率也限制了其性能。本文研究了碳量子点作为电荷桥，促进磷酸钴（Co-Pi）/Fe 2 O3光阳极/电催化剂界面的电荷转移动力学。结果表明，碳量子点的加入显著提高了Co-Pi/Fe 2 O3光阳极的电荷转移和电荷分离效率。在0.6 V（相对于Ag/AgCl）下，光电流大幅增强至4.9 mA/cm（2），远高于相同情况下Co-Pi/Fe 2 O3光阳极的3.7 mA/cm（2）。这些结果提供了一种策略，以提高光阳极的性能，通过促进与碳量子点的光阳极/电催化剂界面处的电接触。(C)2018爱思唯尔有限公司版权所有。
Due to its earth abundant and excellent stability, metal oxide semiconductor attracts great attention in photoelectrochemical water splitting. However, its performance is restricted due to the high recombination rate of electron-hole pairs even modified with electrocatalysts. In this work, carbon quantum dots are studied as the charge bridge to boost the charge transfer kinetics of cobalt phosphate (Co-Pi)/Fe2O3 photoanode at the photoanode/electrocatalyst interface. Our results show that carbon quantum dots significantly improve the charge transfer and charge separation efficiency of Co-Pi/Fe2O3 photoanode. The photocurrent is substantially enhanced to 4.9 mA/cm(2) at 0.6 V (vs. Ag/AgCl) which is much higher than Co-Pi/Fe2O3 photoanode 3.7 mA/cm(2) in the same situation. These results provide a strategy to improve photoanode performance by facilitating the electrical contact at the photoanode/electrocatalyst interface with carbon quantum dots. (C) 2018 Elsevier Ltd. All rights reserved.