康乃馨形MOF-Ni转化为Ni-Fe普鲁士蓝类似物衍生的高效双功能尿素电解催化剂,ACS Sustainable Chemistry & Engineering

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康乃馨形MOF-Ni转化为Ni-Fe普鲁士蓝类似物衍生的高效双功能尿素电解催化剂
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2020-10-14 , DOI: 10.1021/acssuschemeng.0c06883
Huizhu Xu ₁ , Ke Ye ₁ , Kai Zhu ₁ , Yinyi Gao ₁ , Jinling Yin ₁ , Jun Yan ₁ , Guiling Wang ₁ , Dianxue Cao ₁

Affiliation

与氧气释放反应（OER）相比，尿素氧化反应（UOR）在碱性电解液中更容易发生反应，尿素电解的热力学电压为0.37 V，远低于理论水分解电压（1.23 V）。在这项工作中，通过两个步骤使Ni-Fe普鲁士蓝类似物在MOF-Ni上生长。首先，康乃馨形的MOF-Ni直接生长在泡沫镍上。其次，在MOF-Ni模板上生长纳米立方体状的普鲁士蓝类似物。在管式炉中进行磷化反应后，Ni ₂ P / Fe ₂获得P（表示为MNPBA-P）。MNPBA-P仍可以在康乃馨形MOF-Ni上保持纳米立方体的初始结构，这使其具有更好的电导率和更大的电化学活性表面积。作为一种双功能催化剂，MNPBA-P在正极和负极的催化反应中具有良好的性能。值得注意的是，当将0.5 M尿素添加到电解质中时，阳极高电势得到了极大的改善。与整体水分解相比，组装到电解槽中的MNPBA-P在尿素电解中需要较小的电池电压。MNPBA-P || MNPBA-P电解槽仅需1.50 V即可提供10 mA cm ^–2的尿素电解质，并具有12小时的良好稳定性。

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Transforming Carnation-Shaped MOF-Ni to Ni–Fe Prussian Blue Analogue Derived Efficient Bifunctional Electrocatalyst for Urea Electrolysis

Compared with the oxygen evolution reaction (OER), the urea oxidation reaction (UOR) is more likely to react in an alkaline electrolyte, and the thermodynamic voltage of urea electrolysis is 0.37 V, which is much smaller than the theoretical voltage of water-splitting (1.23 V). In this work, a Ni–Fe Prussian blue analogue is grown on MOF-Ni by two steps. First, carnation-shaped MOF-Ni is directly grown on the nickel foam. Second, nanocube-like Prussian blue analogue is grown on a MOF-Ni template. After phosphating reaction in a tube furnace, Ni₂P/Fe₂P (denoted as MNPBA-P) is obtained. MNPBA-P can still maintain the initial structure of nanocubes on a carnation-shaped MOF-Ni, which causes it to have better conductivity and larger electrochemical active surface area. As a bifunctional catalyst, MNPBA-P has a good performance in the catalytic reaction of cathode and anode. It is worth noting that when 0.5 M urea was added to the electrolyte, the high anode overpotential is greatly improved. Compared with overall water-splitting, MNPBA-P assembled into an electrolyzer requires smaller cell voltage in urea electrolysis. MNPBA-P || MNPBA-P electrolyzer only needs 1.50 V to afford 10 mA cm^–2 in urea electrolyte and has a good stability for 12 h.

更新日期：2020-10-26

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