轻松构建超薄 V 掺杂 NiSe2/Ni3Se4/CuSe 纳米片以增强尿素辅助电化学产氢,Energy & Fuels

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轻松构建超薄 V 掺杂 NiSe2/Ni3Se4/CuSe 纳米片以增强尿素辅助电化学产氢
Energy & Fuels ( IF 5.2 ) Pub Date : 2024-04-22 , DOI: 10.1021/acs.energyfuels.4c00499
Yuying Feng ₁ , Wene Du ₁ , Jiahui Jiang ₁ , Ting Zhao ₁ , Guancheng Xu ₁ , Li Zhang _{1,

2}

Affiliation

电解水制氢是一项绿色技术，有利于缓解当前严峻的能源和环境危机。但受高析氧反应（OER）势的影响，能耗较高。用尿素氧化反应（UOR）代替OER可以降低能耗。在此，通过水热和低温硒化制备了具有超薄纳米片结构催化剂（V–NiSe ₂ /Ni ₃ Se _{4 /CuSe/NF）的V掺杂双金属硒化物。该催化剂具有优异的UOR活性，在100 mA cm}^–2下电势低至1.33 V ，并且具有出色的稳定性（10 mA cm ^–2下120小时）。电化学测量和表征表明，NiSe ₂ /Ni ₃ Se ₄和CuSe形成的丰富界面可以诱导电荷转移，从而提高电极材料的催化活性和稳定性。 V掺杂促进了具有折叠的超薄纳米片的形成，有利于扩大催化剂的活性位点以及催化剂与电解质之间的接触区域，从而提高催化活性。原位拉曼测量进一步证明V掺杂有利于催化剂的表面重构，加速UOR的反应动力学。该工作为高活性UOR电极的制备提供了新思路。

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Facile Construction of Ultrathin V-Doped NiSe2/Ni3Se4/CuSe Nanosheets for Enhanced Urea-Assisted Electrochemical Hydrogen Production

Hydrogen production by electrolytic water is a green technology, which is conducive to alleviating the current severe energy and environmental crisis. However, it is affected by the high oxygen evolution reaction (OER) potential and has high energy consumption. Replacing the OER with the urea oxidation reaction (UOR) can reduce energy consumption. Herein, V-doped bimetallic selenides with an ultrathin nanosheet structure catalyst (V–NiSe₂/Ni₃Se₄/CuSe/NF) are prepared via hydrothermal and low-temperature selenization. The catalyst has excellent UOR activity with a low potential of 1.33 V at 100 mA cm^–2 and remarkable stability (120 h at 10 mA cm^–2). Electrochemical measurements and characterization indicate that the abundant interface formed by NiSe₂/Ni₃Se₄ and CuSe can induce charge transfer, thereby improving the catalytic activity and stability of the electrode material. V doping promotes the formation of ultrathin nanosheets with folds, which favors expanding the catalyst’s active site and the contact region between the catalyst and the electrolyte, thus improving the catalytic activity. In situ Raman measurement further proves that V doping is beneficial to the surface reconstruction of the catalyst and accelerates the reaction kinetics of UOR. This work offers a new idea for the preparation of highly active UOR electrodes.

更新日期：2024-04-22

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