Interface engineering on amorphous/crystalline Hydroxides/Sulfides heterostructure nanoarrays for enhanced solar water splitting

Zhang, Hua, Zhou, Yintang, Xu, Ming, Chen, Anran, Ni, Zitao, Akdim, Ouardia, Wågberg, Thomas, Huang, Xiaoyang and Hu, Guangzhi 2023. Interface engineering on amorphous/crystalline Hydroxides/Sulfides heterostructure nanoarrays for enhanced solar water splitting. ACS Nano 17 (1) , 636–647. 10.1021/acsnano.2c09880

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Abstract

Developing highly efficient and stable noble-metal-free electrocatalysts for water splitting is critical for producing clean and sustainable energy. Here, we design a hierarchical transition metal hydroxide/sulfide (NiFe(OH)x–Ni3S2/NF) electrode with dual heterointerface coexistence using a cation exchange-induced surface reconfiguration strategy. The electrode exhibits superior electrocatalytic activities, achieving low overpotentials of 55 mV for hydrogen evolution and 182 mV for oxygen evolution at 10 mA cm–2. Furthermore, the assembled two-electrode system requires voltages as low as 1.55 and 1.62 V to deliver industrially relevant current densities of 500 and 1000 mA cm–2, respectively, with excellent durability for over 200 h, which is comparable to commercial electrolysis. Theoretical calculations reveal that the hierarchical heterostructure increases the electronic delocalization of the Fe and Ni catalytic centers, lowering the energy barrier of the rate-limiting step and promoting O2 desorption. Finally, by implementing the catalysts in a solar-driven water electrolysis system, we demonstrate a record and durable solar-to-hydrogen (STH) conversion efficiency of up to 20.05%. This work provides a promising strategy for developing low-cost and high-efficiency bifunctional catalysts for a large-scale solar-to-hydrogen generation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	American Chemical Society
ISSN:	1936-0851
Date of Acceptance:	12 December 2022
Last Modified:	28 May 2024 15:30
URI:	https://orca.cardiff.ac.uk/id/eprint/167611

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