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Band Structure Engineering toward Low-Onset-Potential Photoelectrochemical Hydrogen Production
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-10-22 , DOI: 10.1021/acsmaterialslett.0c00424 Guo-Qiang Liu 1 , Yuan Yang 1 , Yi Li 1 , Liang Wu 1 , Qian Xu 2 , Junfa Zhu 2 , Shu-Hong Yu 1
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-10-22 , DOI: 10.1021/acsmaterialslett.0c00424 Guo-Qiang Liu 1 , Yuan Yang 1 , Yi Li 1 , Liang Wu 1 , Qian Xu 2 , Junfa Zhu 2 , Shu-Hong Yu 1
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Photoelectrochemical (PEC) hydrogen production can directly and effectively convert solar energy to clean and sustainable hydrogen energy. However, taking the photoanode as an example, the onset potential (Vonset) of the photoanodic current is too positive, which is not conducive to the improvement of energy conversion efficiency and thus hinders the practical application of PEC hydrogen production. Here, we demonstrate a new quaternary alloy nanowire photoanode with low Vonset and high solar conversion efficiency constructed by a narrow-bandgap semiconductor CdSeTe and a wide-bandgap semiconductor CdS, a strategy that enables the energy band modulation by adjusting the molar ratio of the two semiconductors. Through the modulation of the band structure, the negative shift in the Vonset of the PEC hydrogen production can be realized, so that high photocurrent is achieved under a lower bias voltage. As a result, we cathodically shifted the Vonset by 0.7 VRHE on the alloyed cadmium-based chalcogenide photoanode under 1-sun light. This strategy of using energy band modulation to achieve a lower Vonset and high energy conversion efficiency will provide more possibilities for the industrial application of PEC hydrogen production.
中文翻译：
低势能光电化学制氢的能带结构工程
光电化学（PEC）氢气生产可以直接有效地将太阳能转换为清洁且可持续的氢气。但是，以光阳极为例，光阳极电流的起始电位（V inset）太正，不利于能量转换效率的提高，因而阻碍了PEC制氢的实际应用。在这里，我们演示了一种新的具有低V开始的四元合金纳米线光电阳极以及由窄带隙半导体CdSeTe和宽带隙半导体CdS构成的高太阳能转换效率，该策略可通过调整两种半导体的摩尔比来实现能带调制。通过能带结构的调制，可以实现PEC制氢的V起始的负移，从而在较低的偏压下获得高的光电流。结果，我们在1-太阳光下将合金化的镉基硫属化物光电阳极上的V起始电压阴极偏移了0.7 V RHE。这种使用能带调制实现较低V起始的策略 高能量转化效率将为PEC制氢的工业应用提供更多的可能性。
更新日期：2020-12-07
中文翻译：
低势能光电化学制氢的能带结构工程
光电化学（PEC）氢气生产可以直接有效地将太阳能转换为清洁且可持续的氢气。但是，以光阳极为例，光阳极电流的起始电位（V inset）太正，不利于能量转换效率的提高，因而阻碍了PEC制氢的实际应用。在这里，我们演示了一种新的具有低V开始的四元合金纳米线光电阳极以及由窄带隙半导体CdSeTe和宽带隙半导体CdS构成的高太阳能转换效率，该策略可通过调整两种半导体的摩尔比来实现能带调制。通过能带结构的调制，可以实现PEC制氢的V起始的负移，从而在较低的偏压下获得高的光电流。结果，我们在1-太阳光下将合金化的镉基硫属化物光电阳极上的V起始电压阴极偏移了0.7 V RHE。这种使用能带调制实现较低V起始的策略 高能量转化效率将为PEC制氢的工业应用提供更多的可能性。
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