Insights into the deactivation mechanism of a self-supported nickel electrode for 5-hydroxymethyl furfural electrooxidation: focus on the stability of the electrode as a whole

Fangbing Liu; Nan Lin; Deyuan Xin

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Insights into the deactivation mechanism of a self-supported nickel electrode for 5-hydroxymethyl furfural electrooxidation: focus on the stability of the electrode as a whole

机译：Insights into the deactivation mechanism of a self-supported nickel electrode for 5-hydroxymethyl furfural electrooxidation: focus on the stability of the electrode as a whole

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The electro-conversion of 5-hydroxymethylfurfural (HMF), an important biomass-derived building block chemical, is a promising approach to realize the utilization of biomass. Nickel foam is normally used as the substrate of self-supported electrodes for such a reaction. Although self-supported nickel oxide electrodes (NiOx/NF) show excellent electrocatalytic performance during the electrooxidation of HMF to 2,5-furanediformic acid (FDCA), there is still a lack of in-depth understanding of their stability. Herein, we investigated the performance degradation of NiOx/NF electrodes under operating conditions. The results show that the surface current distribution of the electrode is seriously uneven after electrolysis, and the electrochemically active area (ECSA) and intrinsic electrochemical performance decreased after undergoing a process of activation, resulting in deactivation ultimately. There are three possible paths for the deactivation process of NiOx/NF electrodes: (1) catalytically active layer shedding: the catalytic layer undergoes a phase change to form γ-NiOOH and the increased layer spacing leads to volume expansion and subsequent shedding. (2) Nickel matrix dissolution. (3) Oxygen evolution reaction (OER) occurring during electrolysis: oxygen bubbles accelerate the shedding of the catalytic layer, and this shedding behavior is exacerbated when the concentration polarization is high. In this paper, novel strategies are proposed to enhance the stability of NiOx/NF electrode from three aspects: the catalytic layer, the matrix, and the degree of combination of the two.

机译：的electro-conversion 5-hydroxymethylfurfural(羟甲基糠醛),一个重要biomass-derived建筑阻止化学物质,是一种很有前途的方法实现生物质能的利用。通常是作为衬底的且对于这样一个电极反应。尽管且氧化镍电极(NiOx / NF)展示优秀的electrocatalytic在羟甲基糠醛的电氧化性能2, 5-furanediformic酸(FDCA),还有一个他们缺乏深入的理解稳定。性能下降NiOx / NF电极在操作条件下。电极的表面电流分布电解后严重不均匀,(ECSA)发起和电化学领域本征电化学性能下降接受一个激活的过程后,最终导致失活。三种可能路径的失活过程NiOx / NF电极:(1)催化地活跃层脱落:催化层经历相变形成γ-NiOOH和增加层间距导致体积膨胀和随后的脱落。解散。发生在电解:氧气泡沫加速催化层的脱落,这时脱落的行为加剧了浓差极化高。纸,小说策略提出了增强从三个NiOx / NF电极的稳定性方面:催化层,矩阵,两者的结合程度。

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来源
《Catalysis science & technology》 |2023年第10期|3182-3191|共10页
作者
Fangbing Liu; Nan Lin; Deyuan Xin;
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State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, Jilin, China;

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中图分类物理化学（理论化学）、化学物理学;
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Insights into the deactivation mechanism of a self-supported nickel electrode for 5-hydroxymethyl furfural electrooxidation: focus on the stability of the electrode as a whole

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