Constructing Fe-Co2P/CeO2 heterostructure nanosheet arrays for attaining energy-saving hydrogen production in seawater

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2024-07-20 DOI:10.1007/s12598-024-02932-1

Rui-Qing Li, Hang Su, Shui-Xiang Xie, Xiao-Yu Wan, Chang-Ming Wang, Guang-Yu Zhang, Ming-Zheng Ge, Jia-Mu Dai, Chao-Zhuang Xue, Chao-Rong Li, Jun Cao, Wei Zhang

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Abstract

Electrolyzing seawater is a promising solution to produce hydrogen, which is hindered by low-efficiency oxygen evolution reaction (OER) and noxious chloride chemistry. Herein, the Fe-Co₂P/CeO₂ heterostructure nanosheet arrays are developed to achieve energy-saving and chlorine-free hydrogen generation by coupling hydrogen evolution reaction (HER) with hydrazine oxidation reaction (HzOR) in seawater. The Fe-Co₂P/CeO₂ realizes current densities of 10 and 400 mA·cm⁻² at 52 and 204 mV for HER. The anode potential is significantly decreased after replacing OER with HzOR. Theoretical calculations display that the electronic structure of Fe-Co₂P can be regulated after coupling CeO₂, which lowers the water dissociation barrier and optimizes hydrogen adsorption-free energy, thus boosting catalytic kinetics. Significantly, the hybrid seawater electrolyzer produces hydrogen at ultralow cell voltages, greatly reducing traditional water electrolysis voltages and avoiding hazardous chlorine chemistry. This study provides an avenue to exploit advanced catalysts for acquiring hydrogen with energy-efficiency and chlorine-free from abundant ocean.

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构建 Fe-Co2P/CeO2 异质结构纳米片阵列，在海水中实现节能制氢

电解海水是一种很有前景的制氢方案，但其受到低效率氧进化反应（OER）和有毒氯化物化学反应的阻碍。本文开发了 Fe-Co2P/CeO2 异质结构纳米片阵列，通过将海水中的氢进化反应（HER）与肼氧化反应（HzOR）耦合，实现了节能且无氯制氢。Fe-Co2P/CeO2 在 52 和 204 mV 的电压下实现了 10 和 400 mA-cm-2 的 HER 电流密度。用 HzOR 取代 OER 后，阳极电位明显下降。理论计算显示，耦合 CeO2 后，Fe-Co2P 的电子结构可以调节，从而降低了水的解离势垒，优化了无氢吸附能，从而提高了催化动力学。值得注意的是，混合海水电解槽能在超低电池电压下产生氢气，大大降低了传统水电解电压，避免了有害的氯化学反应。这项研究为利用先进催化剂从丰富的海洋中获取高效节能且不含氯的氢气提供了一条途径。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.