Hierarchical nanowire arrays based on carbon nanotubes and Co3O4 decorated ZnO for enhanced photoelectrochemical water oxidation
Hierarchical nanowire arrays based on carbon nanotubes and Co3O4 decorated ZnO for enhanced photoelectrochemical water oxidation
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DOI：
10.1039/c5ta02901e
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发表时间：
2015-06
影响因子：
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通讯作者：
Mu Li;Kun Chang;Tao Wang;Lequan Liu;Huabin Zhang;Peng Li;Jinhua Ye
中科院分区：
文献类型：
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作者：
Mu Li;Kun Chang;Tao Wang;Lequan Liu;Huabin Zhang;Peng Li;Jinhua Ye
采用简单的分步合成策略制备了碳纳米管（CNT）和Co3O4修饰的层叠ZnO纳米线（NW）阵列，获得了高度增强的光电化学水分解活性。在AM 1.5G模拟阳光下，三元CNT-ZnO-Co3O4 NW复合材料的光电流密度（在0.6 V vs. Ag/AgCl下为1.9 mA cm−2，是原始ZnO NWs的2.7倍）和入射光子到电流的转换效率（在340 nm处为52.5%，是原始ZnO NWs的5.1倍）均有所提高。这种增强归因于特殊的非均相三元结构，通过用CNTs和Co3O4修饰ZnO NWs，促进了电子-空穴电荷的分离和转移，降低了水氧化过电位，提高了水裂解的反应速率。
A highly enhanced activity for photoelectrochemical water splitting was achieved by fabricating carbon nanotube (CNT) and Co3O4 decorated hierarchical ZnO nanowire (NW) arrays via a facile stepwise synthesis strategy. The ternary CNT–ZnO–Co3O4 NW composite exhibits an increased photocurrent density (1.9 mA cm−2 at 0.6 V vs. Ag/AgCl, 2.7 times larger than that of the pristine ZnO NWs) and improved incident photon to current conversion efficiency (52.5% at 340 nm, 5.1 times higher than that of the pristine ZnO NWs) as a photoanode under AM 1.5G simulated sunlight. This enhancement is attributed to the specific heterogeneous ternary architecture, which results in promoted electron–hole charge separation and transfer, decreased water oxidation overpotential as well as increased reaction rates of water splitting by decorating ZnO NWs with CNTs and Co3O4.