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Title: Photovoltaic-powered supercapacitors for driving overall water splitting: a dual-modulated 3D architecture
Authors: Sun, Zixu
Sun, Lijuan
Koh, See Wee
Ge, Junyu
Fei, Jipeng
Yao, Mengqi
Hong, Wei
Liu, Shude
Yamauchi, Yusuke
Li, Hong
Keywords: Engineering::Mechanical engineering
Issue Date: 2022
Source: Sun, Z., Sun, L., Koh, S. W., Ge, J., Fei, J., Yao, M., Hong, W., Liu, S., Yamauchi, Y. & Li, H. (2022). Photovoltaic-powered supercapacitors for driving overall water splitting: a dual-modulated 3D architecture. Carbon Energy, 1-12.
Project: M408050000 
Journal: Carbon Energy
Abstract: Due to the growing demand for clean and renewable hydrogen fuel, there has been a surge of interest in electrocatalytic water-splitting devices driven by renewable energy sources. However, the feasibility of self-driven water splitting is limited by inefficient connections between functional modules, lack of highly active and stable electrocatalysts, and intermittent and unpredictable renewable energy supply. Herein, we construct a dual-modulated three-dimensional (3D) NiCo2O4@NiCo2S4 (denoted as NCONCS) heterostructure deposited on nickel foam as a multifunctional electrode for electrocatalytic water splitting driven by photovoltaic-powered supercapacitors. Due to a stable 3D architecture configuration, abundant active sites, efficient charge transfer, and tuned interface properties, the NCONCS delivers a high specific capacity and rate performance for supercapacitors. A two-electrode electrolyzer assembled with the NCONCS as both the anode and the cathode only requires a low cell voltage of 1.47 V to achieve a current density of 10 mA cm−2 in alkaline electrolyte, which outperforms the state-of-the-art bifunctional electrocatalysts. Theoretical calculations suggest that the generated heterointerfaces in NCONCS improve the surface binding capability of reaction intermediates while regulating the local electronic structures, which thus accelerates the reaction kinetics of water electrolysis. As a proof of concept, an integrated configuration comprising a two-electrode electrolyzer driven by two series-connected supercapacitors charged by a solar cell delivers a high product yield with superior durability.
ISSN: 2637-9368
DOI: 10.1002/cey2.213
Rights: © 2022 The Authors. Carbon Energy published by Wenzhou University and John Wiley & Sons Australia, Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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