Tree branch-shaped cupric oxide for highly effective photoelectrochemical water reduction
Tree branch-shaped cupric oxide for highly effective photoelectrochemical water reduction
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DOI：
10.1039/c5nr00208g
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发表时间：
2015-01-01
期刊：
影响因子：
6.7
通讯作者：
Lee, Jae Sung
中科院分区：
文献类型：
--
作者：
Jang, Youn Jeong;Jang, Ji-Wook;Lee, Jae Sung
采用微波混合退火工艺，在硅衬底上10分钟内制备出了高效率的树枝状CuO光电阴极。独特的分层，一维结构提供了更容易的电荷传输，更大的表面积，和增加的结晶度和晶体有序性与较少的缺陷相比，通过常规的热退火制备的不规则形状的CuO。结果，与对于通过热退火制造的光阴极观察到的-1.44mA cm（-2）相比，用树枝形CuO制造的光阴极在AM 1.5G模拟太阳光下在0 V-RHE下产生前所未有的高的光电流密度-4.4mA cm（-2）。实验还证实了树枝状CuO光电阴极和铂阳极的光电化学分解水产生了化学计量的氢和氧。
Highly efficient tree branch-shaped CuO photocathodes are fabricated using the hybrid microwave annealing process with a silicon susceptor within 10 minutes. The unique hierarchical, one-dimensional structure provides more facile charge transport, larger surface areas, and increased crystallinity and crystal ordering with less defects compared to irregular-shaped CuO prepared by conventional thermal annealing. As a result, the photocathode fabricated with the tree branch-shaped CuO produces an un-precedently high photocurrent density of -4.4 mA cm(-2) at 0 V-RHE under AM 1.5 G simulated sunlight compared to -1.44 mA cm(-2) observed for a photocathode fabricated by thermal annealing. It is also confirmed that stoichiometric hydrogen and oxygen are produced from photoelectrochemical water splitting on the tree branch-shaped CuO photocathode and a platinum anode.