Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
Nanoscale. 2015 Oct 7;7(37):15291-9. doi: 10.1039/c5nr04107d.
A two-storey structured photoanode of a 3D Cu2ZnSnS4(CZTS)/CdS/ZnO@steel composite nanostructure has been fabricated by using the solution method and demonstrated highly efficient photoelectrochemical hydrogen generation due to its contraption in the structure for sufficient light absorption as well as the three step-down band alignments for efficient charge separation and transport. This composite structure is composed of two storeys: the upper storey is the CZTS/CdS/ZnO hetero-nanorods (NRs) covered on the stainless steel mesh; the bottom storey is the CZTS/CdS/ZnO hetero-NRs grown on the FTO glass. The CZTS/CdS/ZnO hetero-NRs have cascade band gaps decreasing from 3.15 to 1.82 eV, which gives them efficient charge transfer and broad photoresponse in the UV to near-IR region, resulting in 47% IPCE in a wide light region from 400 to 500 nm; and the stainless steel mesh serves not only as a conductor for charge transport, but also as a skeleton of the grid structure for absorbing more light. The related mechanism has been investigated, which demonstrates that the two-storey CZTS/CdS/ZnO@steel composite nanostructure would have great potential as a promising photoelectrode with high efficiency and low cost for PEC hydrogen generation.
已经通过溶液法制备了具有两层结构的 3D Cu2ZnSnS4(CZTS)/CdS/ZnO@钢复合纳米结构的光电阳极，由于其在结构中具有充足的光吸收以及三个能级的向下能带排列，用于高效的电荷分离和输运，因此该光电阳极具有高效的光电化学制氢性能。该复合结构由两层组成：上层是覆盖在不锈钢网上的 CZTS/CdS/ZnO 异质纳米棒（NRs）；底层是在 FTO 玻璃上生长的 CZTS/CdS/ZnO 异质 NRs。CZTS/CdS/ZnO 异质 NRs 的能带间隙呈级联式从 3.15eV 降低至 1.82eV，这使其在紫外光到近红外光区域具有高效的电荷转移和宽光响应，从而在 400nm 到 500nm 的宽光区域内实现了 47%的 IPCE；不锈钢网不仅作为电荷传输的导体，还作为吸收更多光的网格结构的骨架。已经对相关机制进行了研究，表明两层 CZTS/CdS/ZnO@钢复合纳米结构具有很大的潜力，可用作高效、低成本的 PEC 制氢光电阳极。
