Boosting CO2 Electroreduction on Bismuth Nanoplates with a Three-Dimensional Nitrogen-Doped Graphene Aerogel Matrix,ACS Applied Materials & Interfaces

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Boosting CO2 Electroreduction on Bismuth Nanoplates with a Three-Dimensional Nitrogen-Doped Graphene Aerogel Matrix
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-04-14 , DOI: 10.1021/acsami.3c02578
Xiao-Ting Jing ₁ , Zhejiaji Zhu ₁ , Li-Wei Chen ₁ , Di Liu ₁ , Hui-Zi Huang ₁ , Wen-Jing Tian ₁ , An-Xiang Yin ₁

Affiliation

Electrochemical CO₂ reduction reaction (CO₂RR), which uses renewable electricity to produce high-value-added chemicals, offers an alternative clean path to the carbon cycle. However, bismuth-based catalysts show great potential for the conversion of CO₂ and water to formate, but their overall efficiency is still hampered by the weak CO₂ adsorption, low electrical conductivity, and slow mass transfer of CO₂ molecules. Herein, we report that a rationally modulated nitrogen-doped graphene aerogel matrix (NGA) can significantly enhance the CO₂RR performance of bismuth nanoplates (BiNPs) by both modulating the electronic structure of bismuth and regulating the interface for chemical reaction and mass transfer environments. In particular, the NGA prepared by reducing graphene oxide (GO) with hydrazine hydrate (denoted as NGA_hdrz) exhibits significantly enhanced strong metal–support interaction (SMSI), increased specific surface area, strengthened CO₂ adsorption, and modulated wettability. As a result, the Bi/NGA_hdrz exhibits significantly boosted CO₂RR properties, with a Faradaic efficiency (FE) of 96.4% at a current density of 51.4 mA cm^–2 for formate evolution at a potential of −1.0 V versus reversible hydrogen electrode (vs RHE) in aqueous solution under ambient conditions.

中文翻译：

用三维氮掺杂石墨烯气凝胶基质促进铋纳米板上的 CO2 电还原

电化学 CO ₂还原反应 (CO ₂ RR) 使用可再生电力生产高附加值化学品，为碳循环提供了一条替代清洁途径。然而，铋基催化剂在将 CO ₂和水转化为甲酸盐方面显示出巨大的潜力，但它们的整体效率仍然受到 CO ₂弱吸附、低电导率和 CO ₂分子传质缓慢的阻碍。在此，我们报道了合理调制的氮掺杂石墨烯气凝胶基质 (NGA) 可以显着提高 CO ₂通过调节铋的电子结构和调节化学反应和传质环境的界面，铋纳米板 (BiNP) 的 RR 性能。特别是，通过用水合肼还原氧化石墨烯 (GO) 制备的 NGA（表示为 NGA _hdrz）表现出显着增强的强金属-载体相互作用 (SMSI)、增加的比表面积、增强的 CO ₂吸附和可调节的润湿性。因此，Bi/NGA _hdrz表现出显着增强的 CO ₂ RR 特性，在 51.4 mA cm ^{–2的电流密度下法拉第效率 (FE) 为 96.4%}在环境条件下在水溶液中相对于可逆氢电极（相对于 RHE）在 -1.0 V 的电位下形成甲酸盐。

更新日期：2023-04-14

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