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首页> 外文期刊>Advanced energy materials >Extended Light Harvesting with Dual Cu_2O-Based Photocathodes for High Efficiency Water Splitting
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Extended Light Harvesting with Dual Cu_2O-Based Photocathodes for High Efficiency Water Splitting

机译：双Cu_2O基光电阴极扩展的光收集，可实现高效水分解

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摘要

Cu2O is one of the most promising light absorbing materials for solar energy conversion. Previous studies with Cu2O for water splitting usually deliver high photocurrent or high photovoltage, but not both. Here, a Cu2O/Ga2O3/TiO2/RuOx photocathode that benefits from a high quality thermally oxidized Cu2O layer and good band alignment of the Ga2O3 buffer layer is reported, yielding a photocurrent of 6 mA cm(-2) at 0 V versus reversible hydrogen electrode (RHE), an onset potential of 0.9 V versus RHE, and 3.5 mA cm(-2) at 0.5 V versus RHE. The quantum efficiency spectrum (incident photon to current efficiency, IPCE) reveals a dramatically improved green/red response and a decreased blue response compared with electrodeposited Cu2O films. Light intensity dependence and photocurrent transient studies enable the identification of the limitations in the performance. Due to the complementary IPCE curves of thermally oxidized and electrodeposited Cu2O photocathodes, a dual photocathode is fabricated to maximize the absorption over the entire range of above band gap radiation. Photocurrents of 7 mA cm(-2) at 0 V versus RHE are obtained in the dual photocathodes, with an onset potential of 0.9 V versus RHE and a thermodynamically based energy conversion efficiency of 1.9%.
机译：Cu 2 O是用于太阳能转换的最有希望的吸光材料之一。以前使用Cu2O进行水分解的研究通常提供高光电流或高光电压，但不能同时提供。在此，据报道，受益于高质量的热氧化Cu2O层和Ga2O3缓冲层的良好能带对准性的Cu2O / Ga2O3 / TiO2 / RuOx光电阴极，与可逆氢相比，在0 V时产生6 mA cm（-2）的光电流电极（RHE），相对于RHE的起始电位为0.9 V，相对于RHE的0.5 V处的起始电位为3.5 mA cm（-2）。与电沉积的Cu2O薄膜相比，量子效率光谱（光子对电流效率的入射光，IPCE）显示出显着改善的绿色/红色响应和降低的蓝色响应。光强度依赖性和光电流瞬态研究使得能够确定性能限制。由于热氧化和电沉积的Cu2O光电阴极具有互补的IPCE曲线，因此制作了双光电阴极以在上述带隙辐射的整个范围内最大化吸收率。在双光电阴极中，相对于RHE，在0 V时的光电流为7 mA cm（-2），相对于RHE，其起始电位为0.9 V，基于热力学的能量转换效率为1.9％。

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  • 来源
    《Advanced energy materials》 |2018年第10期|1702323.1-1702323.8|共8页
  • 作者

    Niu Wenzhe; Moehl Thomas; Cui Wei; Wick-Joliat Rene; Zhu Liping; Tilley S. David;

  • 作者单位

    Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Univ Zurich, Dept Chem, Winterthurerstr 190, CH-8057 Zurich, Switzerland;

    Univ Zurich, Dept Chem, Winterthurerstr 190, CH-8057 Zurich, Switzerland;

    Univ Zurich, Dept Chem, Winterthurerstr 190, CH-8057 Zurich, Switzerland;

    Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Univ Zurich, Dept Chem, Winterthurerstr 190, CH-8057 Zurich, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    copper oxide (Cu2O); dual photocathodes; thermal oxidation; water splitting;

    机译：氧化铜;双光电阴极;热氧化;水分解;

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