Comparison between the measured and modeled hydrogen-evolution activity of Ni- or Pt-coated silicon photocathodes
Comparison between the measured and modeled hydrogen-evolution activity of Ni- or Pt-coated silicon photocathodes
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DOI：
10.1016/j.ijhydene.2013.12.162
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发表时间：
2014-09
影响因子：
7.2
通讯作者：
Zhuangqun Huang;James R. McKone;C. Xiang;R. Grimm;E. Warren;Joshua M. Spurgeon;H. Lewerenz;B. Brunschwig;N. Lewis
中科院分区：
文献类型：
--
作者：
Zhuangqun Huang;James R. McKone;C. Xiang;R. Grimm;E. Warren;Joshua M. Spurgeon;H. Lewerenz;B. Brunschwig;N. Lewis
实验测量了Ni和Pt纳米粒子在p型Si光电阴极上的析氢反应（HER）电催化行为，并将一般金属催化剂在p型Si上的电流密度-电位（J-E）特性模拟为Si光电二极管与金属电催化剂串联的组合。相对于静止电位，由该模型产生的J-E特性表明，相对于金属电极，金属化光电极达到指定电流密度所需的总过电位增加。该预测与实验观察到的Pt在p-Si上的行为雅阁，但与Ni在p-Si上观察到的行为相反。正确地考虑结的能量学和动力学的HER是至关重要的准确预测的太阳能到氢（STH）的能量转换效率的金属化集成光电化学系统。此外，需要精确预测半导体光吸收体上的金属催化剂的性能的模型来优化金属化光电极的催化性能。
The electrocatalytic behavior of Ni and Pt nanoparticles for the hydrogen-evolution reaction (HER) on p-type Si photocathodes was measured experimentally and the current density vs. potential (J–E) characteristics of a general metal catalyst on p-Si was modeled as a combination of a Si photodiode in series electrically with metal electrocatalysts. Relative to the rest potential, theJ–Echaracteristics produced by the model showed an increase in total overpotential required to reach a specified current density for the metallized photoelectrodes relative to that of a metal electrode. This prediction was in accord with the experimentally observed behavior of Pt on p-Si, but was in contrast to the behavior observed for Ni on p-Si. Properly accounting for junction energetics and kinetics of the HER is critical to accurate predictions of the solar-to-hydrogen (STH) energy-conversion efficiency of metallized integrated photoelectrochemical systems. Further, models that accurately predict the performance of metal catalysts on semiconductor light absorbers are required to optimize the catalytic performance of metallized photoelectrodes.