异质结
电解
化学
碱性水电解
电解水
安培
电流(流体)
电极
电流密度
光电子学
无机化学
热力学
物理化学
电解质
物理
量子力学
作者
Hao Chen,Hui-Bin Huang,Haihong Li,Shui-Zhong Zhao,Lidong Wang,Jia Zhang,Sheng-Liang Zhong,Cheng-Feng Lao,Liming Cao,Chun‐Ting He
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2023-02-09
卷期号:62 (7): 3297-3304
被引量:11
标识
DOI:10.1021/acs.inorgchem.2c04525
摘要
Remodeling the active surface through fabricating heterostructures can substantially enhance alkaline water electrolysis driven by renewable electrical energy. However, there are still great challenges in the synthesis of highly reactive and robust heterostructures to achieve both ampere-level current density hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a new Co/CeO2 heterojunction self-supported electrode for sustainable overall water splitting. The self-supporting Co/CeO2 heterostructures required only low overpotentials of 31.9 ± 2.2, 253.3 ± 2.7, and 316.7 ± 3 mV for HER and 214.1 ± 1.4, 362.3 ± 1.9, and 400.3 ± 3.7 mV for OER at 0.01, 0.5, and 1.0 A·cm-2, respectively, being one of the best Co-based bifunctional electrodes. Electrolyzer constructed from this electrode acting as an anode and cathode merely required cell voltages of 1.92 ± 0.02 V at 1.0 A·cm-2 for overall water splitting. Multiple characterization techniques combined with density functional theory calculations disclosed the different active sites on the anode and cathode, and the charge redistributions on the heterointerfaces that can optimize the adsorption of H and oxygen-containing intermediates, respectively. This study presents the tremendous prospective of self-supporting heterostructures for effective and economical overall water splitting.
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