Vertical SrNbO2N Nanorod Arrays for Solar-Driven Photoelectrochemical Water Splitting
Vertical SrNbO2N Nanorod Arrays for Solar-Driven Photoelectrochemical Water Splitting
复制标题
用于太阳能驱动光电化学水分解的垂直 SrNbO2N 纳米棒阵列
DOI：
10.1002/solr.202000448
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发表时间：
2021
期刊：
影响因子：
7.9
通讯作者：
Liu Min
中科院分区：
文献类型：
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作者：
Cao Maoqi;Li Hongmei;Liu Kang;Hu Junhua;Pan Hao;Fu Junwei;Liu Min
尽管带隙约为1.9eV的SrNbO2N被认为是一种有前途的太阳能光催化剂，但其光催化活性在普通条件下通常很差，这主要是由于光载流子的产生、分离和传输较差。在此，首先使用简单的水热方法和氮化过程来实现太阳能驱动的光电化学（PEC）水分解，从而实现了垂直SrNbO2N纳米棒阵列。所得SrNbO2N纳米棒阵列表现出垂直排列的纳米棒形貌和高结晶度，有利于光生载流子的产生和载流子传输。均匀覆盖CoOx纳米颗粒后，SrNbO2N纳米棒阵列在AM1.5G模拟太阳光照射下，在1.23VRHE下呈现出1.3 mA cm−2的光电流，约为SrNbO2N纳米颗粒薄膜电极的2.6倍。这种 PEC 水分解活性是所有报道的 SrNbO2N 电极中最好的值之一。因此，这项工作提供了一种开发用于 PEC 应用的双金属氮氧化物纳米棒阵列的新策略。
Although SrNbO2N with a bandgap of ≈1.9 eV has been considered as a promising photocatalyst for solar water splitting, its photocatalytic activity is generally very poor under ordinary conditions, primarily due to bad photocarrier generation, separation, and transportation. Herein, vertical SrNbO2N nanorod arrays are first achieved using a facile hydrothermal method with a nitridation process for solar‐driven photoelectrochemical (PEC) water splitting. The obtained SrNbO2N nanorod arrays exhibit vertical aligned nanorod morphology and high crystallinity, which are beneficial for photocarrier generation and charge carrier transportation. After being uniformly covered with CoOxnanoparticles, the SrNbO2N nanorod arrays present a photocurrent of 1.3 mA cm−2at 1.23VRHE, which is ≈2.6 times higher than that of a SrNbO2N nanoparticle thin film electrode, under irradiation by AM1.5G simulated sunlight. This PEC water splitting activity is one of the best values among all reported SrNbO2N electrodes. Thus, this work offers a new strategy to develop bimetal oxynitride nanorod arrays for PEC applications.