Ni, Co hydroxide triggers electrocatalytic production of high-purity benzoic acid over 400 mA cm−2,Energy & Environmental Science

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Ni, Co hydroxide triggers electrocatalytic production of high-purity benzoic acid over 400 mA cm−2
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-10-07 , DOI: 10.1039/d0ee02607g
Hongling Huang _{1,

2,

3,

4,

5} , Chang Yu _{1,

2,

3,

4,

5} , Xiaotong Han _{1,

2,

3,

4,

5} , Huawei Huang _{1,

2,

3,

4,

5} , Qianbing Wei _{1,

2,

3,

4,

5} , Wei Guo _{1,

2,

3,

4,

5} , Zhao Wang _{1,

2,

3,

4,

5} , Jieshan Qiu _{1,

2,

3,

4,

5}

Affiliation

With the increasingly prominent energy issues and environment problems, the electrocatalytic production of value-added fine chemicals by hybrid water electrolysis has shown much hope for replacing conventional energy-intensive chemical technology. However, the low current density caused by the competition of the oxygen evolution reaction at the anode has hindered the large-scale production of fine chemicals and H₂. Besides, the separation of products from the complicated electrolyte also remains a significant barrier. Herein, we present the integration of hybrid water electrolysis and conventional crystallization separation for the first time, achieving the electrocatalytic production and separation of benzoic acid without impurities. An amorphous nanosheet composed of Ni, Co hydroxide supported on Ni foam (A-Ni-Co-H/NF), with a large active area and low charge transfer resistance, is prepared for the first time and applied to catalyze the electrocatalytic benzyl alcohol oxidation reaction. A-Ni-Co-H/NF enables us to achieve an industrial-scale current density over 400 mA cm⁻² without the occurrence of the OER, and delivers ultrafast reaction kinetics. The yield of Ph-COOH is close to 100%, only spending 15 min at room temperature and atmosphere pressure. In situ Raman spectroscopy reveals that the as-made A-Ni-Co-H/NF catalyst features reversible structure evolution and recovery during the EBA reaction. The converted nickel oxyhydroxide containing Co species (Co-NiOOH) is confirmed as the real active species. This presents a novel electrocatalyst to achieve industrial-scale prodution for value-added chemicals and the novel integrated technology also provides guidance for the separation and collection of products during the electrocatalytic process.

中文翻译：

Ni，Co氢氧化物引发400 mA cm-2以上的高纯度苯甲酸的电催化生产

随着日益突出的能源问题和环境问题，通过混合水电解以电催化方式生产高附加值精细化学品已显示出替代传统能源密集型化学技术的巨大希望。然而，由阳极处的氧释放反应竞争引起的低电流密度阻碍了精细化学品和H _2的大规模生产。。此外，从复杂的电解质中分离产物仍然是重要的障碍。本文中，我们首次提出了混合水电解与常规结晶分离的集成，实现了无杂质的苯甲酸的电催化生产和分离。首次制备了活性炭面积大，电荷转移电阻低的，由负载在泡沫镍上的镍钴氢氧化物（A-Ni-Co-H / NF）组成的无定形纳米片，并用于催化电催化苯甲醇氧化反应。A-Ni-Co-H / NF使我们能够实现超过400 mA cm ^-2的工业规模电流密度不会发生OER，并具有超快的反应动力学。Ph-COOH的收率接近100％，仅在室温和大气压下花费15分钟。原位拉曼光谱表明，制成的A-Ni-Co-H / NF催化剂在EBA反应过程中具有可逆的结构演变和恢复特征。证实了含有Co物种（Co-NiOOH）的转化的羟基氧化镍为真正的活性物种。这提出了一种新型的电催化剂，可以实现增值化学品的工业规模生产，而新型的集成技术也为电催化过程中产品的分离和收集提供了指导。

更新日期：2020-11-03

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