Atomic Layer Deposition of Platinum Catalysts on Nanowire Surfaces for Photoelectrochemical Water Reduction
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- 作者：Neil P. Dasgupta ; Chong Liu ; Sean Andrews ; Fritz B. Prinz ; Peidong Yang
- 刊名：Journal of the American Chemical Society
- 出版年：2013
- 出版时间：September 4, 2013
- 年：2013
- 卷：135
- 期：35
- 页码：12932-12935
- 全文大小：257K
- 年卷期：v.135,no.35(September 4, 2013)
- ISSN：1520-5126
文摘
The photocathodic hydrogen evolution reaction (HER) from p-type Si nanowire (NW) arrays was evaluated using platinum deposited by atomic layer deposition (ALD) as a HER cocatalyst. ALD of Pt on the NW surface led to a highly conformal coating of nanoparticles with sizes ranging from 0.5 to 3 nm, allowing for precise control of the Pt loading in deep submonolayer quantities. The catalytic performance was measured using as little as 1 cycle of Pt ALD, which corresponded to a surface mass loading of 10 ng/cm2. The quantitative exploration of the lower limits of Pt cocatalyst loading reported here, and its application to high-surface-area NW photoelectrodes, establish a general approach for minimizing the cost of precious-metal cocatalysts for efficient and affordable solar-to-fuel applications.