title: Atomic layer deposition of platinum catalysts on nanowire surfaces for photoelectrochemical water reduction.
abstract: 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/cm(2). 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.
authors: Department of Chemistry, University of California, Berkeley, California 94720, United States.
authors: Neil P
authors: NP
authors: Dasgupta
authors: Chong
authors: C
authors: Liu
authors: Sean
authors: S
authors: Andrews
authors: Fritz B
authors: FB
authors: Prinz
authors: Peidong
authors: P
authors: Yang