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Tailored NiFe Catalyst on Silicon Photoanode for Efficient Photoelectrochemical Water Oxidation
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-01-24 , DOI: 10.1021/acs.jpcc.9b10967 Zhi Liu 1, 2 , Changli Li 3 , Yequan Xiao 2 , Faze Wang 2 , Qian Yu 2 , M. Bilal Faheem 2 , Tao Zhou 1 , Yanbo Li 2, 4
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-01-24 , DOI: 10.1021/acs.jpcc.9b10967 Zhi Liu 1, 2 , Changli Li 3 , Yequan Xiao 2 , Faze Wang 2 , Qian Yu 2 , M. Bilal Faheem 2 , Tao Zhou 1 , Yanbo Li 2, 4
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The decoration of n-type silicon (n-Si) with bimetallic NiFe nanoparticles has been shown to be an effective approach in achieving efficient photoelectrochemical (PEC) water oxidation. However, the ratio of Ni/Fe was not precisely controlled in the previous studies and the respective effects of Ni and Fe on the PEC performance have not been systematically investigated. In this work, dual-source electron beam evaporation is employed to deposit NiFe nanoparticles on n-Si with precisely controlled Ni/Fe ratios. The NiFe/SiOx/n-Si photoanode records an applied bias photon-to-current efficiency (ABPE) of 3.03 ± 0.10% with a Ni/Fe ratio of 3:1. However, the stability of the photoanode decreases with higher Fe content, which is ascribed to the leaching of Fe catalytic sites. With the addition of Fe ions into the electrolyte, the ABPE is maintained at 3.12 ± 0.04% and the stability is significantly improved. Our results highlight a potential method to achieve efficient and stable PEC water oxidation with this simple device architecture.
中文翻译：
硅光电阳极上定制的NiFe催化剂，用于高效光电化学水氧化
用双金属NiFe纳米粒子装饰n型硅（n-Si）已被证明是实现有效的光电化学（PEC）水氧化的有效方法。然而，在先前的研究中并未精确控制Ni / Fe的比例，并且尚未系统地研究Ni和Fe对PEC性能的影响。在这项工作中，采用双源电子束蒸发法以精确控制的Ni / Fe比将NiFe纳米颗粒沉积在n-Si上。NiFe / SiO x/ n-Si光电阳极记录的外加偏压光子-电流效率（ABPE）为3.03±0.10％，Ni / Fe比为3：1。然而，随着Fe含量的增加，光阳极的稳定性降低，这归因于Fe催化位的浸出。通过在电解质中添加铁离子，ABPE保持在3.12±0.04％，稳定性得到显着改善。我们的结果突出了通过这种简单的设备架构实现高效，稳定的PEC水氧化的潜在方法。
更新日期：2020-01-26
中文翻译：
硅光电阳极上定制的NiFe催化剂，用于高效光电化学水氧化
用双金属NiFe纳米粒子装饰n型硅（n-Si）已被证明是实现有效的光电化学（PEC）水氧化的有效方法。然而，在先前的研究中并未精确控制Ni / Fe的比例，并且尚未系统地研究Ni和Fe对PEC性能的影响。在这项工作中，采用双源电子束蒸发法以精确控制的Ni / Fe比将NiFe纳米颗粒沉积在n-Si上。NiFe / SiO x/ n-Si光电阳极记录的外加偏压光子-电流效率（ABPE）为3.03±0.10％，Ni / Fe比为3：1。然而，随着Fe含量的增加，光阳极的稳定性降低，这归因于Fe催化位的浸出。通过在电解质中添加铁离子，ABPE保持在3.12±0.04％，稳定性得到显着改善。我们的结果突出了通过这种简单的设备架构实现高效，稳定的PEC水氧化的潜在方法。
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