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Better Charge Separation in CuO Nanowire Array Photocathodes: Micro-/Nanostructure Regulation for Photoelectrochemical Reaction
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-19 00:00:00 , DOI: 10.1021/acsaem.0c00554 Yufeng Cao 1, 2 , Deyu Liu 2, 3 , Xin Ni 2 , Xiangrui Meng 2 , Yang Zhou 2 , Zhenfan Sun 1 , Yongbo Kuang 2, 3
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-19 00:00:00 , DOI: 10.1021/acsaem.0c00554 Yufeng Cao 1, 2 , Deyu Liu 2, 3 , Xin Ni 2 , Xiangrui Meng 2 , Yang Zhou 2 , Zhenfan Sun 1 , Yongbo Kuang 2, 3
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Geometrical optimization of nanowire arrays (NWAs) has been regarded as a straightforward and important route to improve the performance for photoelectrocatalytic systems but has not been realized with copper oxides yet. In this work we successfully performed the control to CuO NWAs via electrochemically prepared Cu(OH)2 intermediate structures. The arrays consist of uniform nanowires with tunable length from 2 to 10 μm and aspect ratios over 100. Results suggest that the optimization can significantly improve the photocurrents several times, which is mostly due to a quantum efficiency over 57% (455 nm) in the presence of electron scavengers. Notably diverged charge transport and transfer between NWAs were revealed by photoelectrochemical impedance and Mott–Schottky measurements, which suggest the necessity of suitable structure for the better charge separation and collection. Moreover, our protocol can be adapted to prepare Cu2O NWAs, which can provide great potential for developing high-performance photocathodes in the future.
中文翻译：
CuO纳米线阵列光电阴极中更好的电荷分离：光电化学反应的微观/纳米结构调节。
纳米线阵列（NWAs）的几何优化已被视为改善光电催化系统性能的直接且重要的途径，但尚未被氧化铜实现。在这项工作中，我们通过电化学制备的Cu（OH）2成功地控制了CuO NWA中间结构。该阵列由可调长度从2到10μm且纵横比超过100的均匀纳米线组成。结果表明，该优化可以显着提高光电流数倍，这主要是由于量子效率超过57％（455 nm）电子清除剂的存在。光电电化学阻抗和Mott–Schottky测量结果表明NWA之间的电荷转移和转移存在明显差异，这表明必须采用合适的结构才能更好地分离和收集电荷。此外，我们的协议可适用于制备Cu 2 O NWA，可为将来开发高性能光电阴极提供巨大潜力。
更新日期：2020-06-19
中文翻译：
CuO纳米线阵列光电阴极中更好的电荷分离：光电化学反应的微观/纳米结构调节。
纳米线阵列（NWAs）的几何优化已被视为改善光电催化系统性能的直接且重要的途径，但尚未被氧化铜实现。在这项工作中，我们通过电化学制备的Cu（OH）2成功地控制了CuO NWA中间结构。该阵列由可调长度从2到10μm且纵横比超过100的均匀纳米线组成。结果表明，该优化可以显着提高光电流数倍，这主要是由于量子效率超过57％（455 nm）电子清除剂的存在。光电电化学阻抗和Mott–Schottky测量结果表明NWA之间的电荷转移和转移存在明显差异，这表明必须采用合适的结构才能更好地分离和收集电荷。此外，我们的协议可适用于制备Cu 2 O NWA，可为将来开发高性能光电阴极提供巨大潜力。
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