自支撑 Co/CeO2 异质结构用于安培级电流密度碱性水电解,Inorganic Chemistry

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自支撑 Co/CeO2 异质结构用于安培级电流密度碱性水电解
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2023-02-09 , DOI: 10.1021/acs.inorgchem.2c04525
Hao Chen ₁ , Hui-Bin Huang ₁ , Hai-Hong Li ₁ , Shui-Zhong Zhao ₁ , Li-Dong Wang ₁ , Jia Zhang ₁ , Sheng-Liang Zhong ₁ , Cheng-Feng Lao ₁ , Li-Ming Cao ₁ , Chun-Ting He ₁

Affiliation

通过制造异质结构重塑活性表面可以显着增强由可再生电能驱动的碱性水电解。然而，在合成高反应性和稳健的异质结构以实现安培级电流密度析氢反应（HER）和析氧反应（OER）方面仍然存在巨大挑战。在此，我们报告了一种用于可持续整体水分解的新型 Co/CeO ₂异质结自支撑电极。_在0.01、0.5 、和 1.0 A·cm ^–2，分别是最好的钴基双功能电极之一。由该电极构成的电解槽作为阳极和阴极仅需要 1.92 ± 0.02 V 在 1.0 A·cm ^–2下的电池电压即可实现整体水分解。多种表征技术结合密度泛函理论计算揭示了阳极和阴极上的不同活性位点，以及异质界面上的电荷重新分布，可以分别优化 H 和含氧中间体的吸附。这项研究展示了自支撑异质结构在有效和经济的整体水分解方面的巨大前景。

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Self-Supporting Co/CeO2 Heterostructures for Ampere-Level Current Density Alkaline Water Electrolysis

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.

更新日期：2023-02-09

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