Improved photoelectrochemical water splitting efficiency of nanoporous GaN photoanode
Improved photoelectrochemical water splitting efficiency of nanoporous GaN photoanode
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DOI：
10.1088/0268-1242/27/1/015014
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发表时间：
2012-01-01
影响因子：
1.9
通讯作者：
Han, Jung
中科院分区：
文献类型：
--
作者：
Ryu, Sang-Wan;Zhang, Yu;Han, Jung
将纳米多孔GaN作为光电化学分解水的光阳极，并与平面GaN的效率和稳定性进行了比较。在光照下，NP GaN显示出更大的光电流密度，这表明更多的氢产生。当外加电压较大时，半导体和电解质之间的电荷转移限制了水的裂解过程，从而提高了催化剂的活性。在水裂解过程中，光电流随着时间的推移而下降;然而，对于NP GaN，光电流退化不太严重。这归因于由于其大的表面积，NP GaN中的空穴从光阳极到电解质的有效传输。
Nanoporous (NP) GaN was used as a photoanode during photoelectrochemical water splitting and its efficiency and stability were compared with those of planar GaN. The NP GaN showed larger photocurrent density under illumination, which indicated more hydrogen generation. The enhancement was higher for a large applied voltage where the water splitting process was limited by charge transfer between semiconductor and electrolyte. Photocurrents decreased with time during the water splitting; however, the photocurrent degradation was less severe for NP GaN. It was attributed to efficient hole transport from photoanode to electrolyte in NP GaN due to its large surface area.