Integrated hetero-nanoelectrodes for plasmon-enhanced electrocatalysis of hydrogen evolution
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Integrated hetero-nanoelectrodes for plasmon-enhanced electrocatalysis of hydrogen evolution Wenyu Jiang1,2, Xianxin Wu2,3, Jinquan Chang1,2, Yanhong Ma1, Luting Song1, Zhexue Chen1,2, Cheng Liang1,2, Xinfeng Liu2,3, and Yong Zhang1,2 () 1
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 13 July 2020 / Revised: 1 October 2020 / Accepted: 10 October 2020
ABSTRACT Hetero-nanostructures of plasmonic metals and semiconductors have attracted increasing attention in the field of photocatalysis. However, most of the hetero-nanostructured catalysts are randomly arranged and therefore require comprehensive structural design for optimizing their properties. Herein, we report the robust construction of hierarchical hetero-nanostructures where gold (Au) nanorods and molybdenum disulfide (MoS2) quantum sheets (QSs) are integrated in highly ordered arrays. Such construction is achieved through porous anodic alumina (PAA) template-assisted electrodeposition. The as-fabricated hetero-nanostructures demonstrate exciting electrocatalysis towards hydrogen evolution reaction (HER). Both plasmon-induced hot-electron injection and plasmonic scattering/reabsorption mechanisms are determinative to the enhanced electrocatalytic performances. Notably, broadband photoresponses of HER activity in the visible range are observed, indicating their superiority compared with random systems. Such integrated hetero-nanoelectrodes could provide a powerful platform for conversion and utilization of solar energy, meanwhile would greatly prompt the production and exploration of ordered nanoelectrodes.
KEYWORDS nano-integration, heterostructure, plasmonic metal, molybdenum disulfide (MoS2), hydrogen evolution reaction (HER)
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Introduction
Hetero-nanostructures integrating varying nanoscale components have recently attracted much attention thanks to their intrinsic interactions of individual functions (electronic, optical, optoelectronic, catalytic, etc) [1–3]. Such interactions can be further enhanced when the components are orderly arranged in the integrated structures [4]. By precise control of the periodic and structural lengths, the collective behaviors which are not hosted in the individual components can be readily observed [5, 6]. A variety of hetero-nanostructures, such as metal/metal [6–9] and metal/semiconductor [10], have been reported. Notably, the metal/two-dimensional (2D) material hetero-nanostructures [11–13] are emerging for plasmonenhanced applications in optoelectronics [14], optical sensing [15], and photocatalysis [16]. For example, by combining the plas
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