Atomic Layer Deposition of Platinum Catalysts on Nanowire Surfaces for Photoelectrochemical Water Reduction
Atomic Layer Deposition of Platinum Catalysts on Nanowire Surfaces for Photoelectrochemical Water Reduction
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DOI：
10.1021/ja405680p
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发表时间：
2013-09-04
影响因子：
15
通讯作者：
Yang, Peidong
中科院分区：
文献类型：
--
作者：
Dasgupta, Neil P.;Liu, Chong;Yang, Peidong
采用原子层沉积法（ALD）沉积铂作为光阴极析氢助催化剂，研究了p型硅纳米线（NW）阵列的光阴极析氢反应。ALD的Pt在NW表面上导致高度保形涂层的纳米颗粒的尺寸范围从0.5到3纳米，允许精确控制的Pt负载在深亚单层量。使用少至1个周期的Pt ALD测量催化性能，其对应于类似于10 ng/cm（2）的表面质量负载。这里报道的Pt助催化剂负载的下限的定量探索，以及其在高表面积NW光电极中的应用，建立了一种用于最小化贵金属助催化剂的成本以用于高效且负担得起的太阳能-燃料应用的一般方法。
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 similar to 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.