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Solvent modulated self-assembled VS2 layered microstructure for electrocatalytic water and urea decomposition
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-01-24 , DOI: 10.1002/er.7651 Supriya A. Patil 1 , Nabeen K. Shrestha 2 , Hoa Thi Bui 3, 4 , Vijay D. Chavan 5 , Deok‐kee Kim 5 , Shoyebmohamad F. Shaikh 6 , Mohd Ubaidullah 6 , Hyungsang Kim 2 , Hyunsik Im 2
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-01-24 , DOI: 10.1002/er.7651 Supriya A. Patil 1 , Nabeen K. Shrestha 2 , Hoa Thi Bui 3, 4 , Vijay D. Chavan 5 , Deok‐kee Kim 5 , Shoyebmohamad F. Shaikh 6 , Mohd Ubaidullah 6 , Hyungsang Kim 2 , Hyunsik Im 2
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Urea oxidation reaction (UOR) assisted water-splitting is a promising approach for effective treatment of urea-rich waste-water at the anode and parallelly generate green-hydrogen (H2) energy at the cathode via hydrogen evolution reaction (HER). However, facile designing and fabricating robust and cheap electrodes derived from earth-abundant materials is a great challenge. This work reports the synthesis of vanadium sulfide (VS2) micro-flowered structure via solvent-assisted hydrothermal method using ethylene glycol as an additive in the aqueous-based reaction medium, which has imparted a significant effect on the morphology and the crystallinity of the VS2. In addition, in contrast to the VS2 electrode fabricated in a pure aqueous medium, the ethylene glycol mediated VS2 electrode upon coupling as a cathode and anode in an HER||UOR vs reversible hydrogen electrode (RHE)-based three-electrode configuration demonstrates a significantly reduced overall urea decomposition potential of 1.38 V at a current density of 10 mA cm−2 as compared to the conventional water-splitting of 1.75 V vs RHE. The obtained high-performance electrocatalytic activity on UOR and HER can be ascribed to the influence of ethylene glycol solvent, particularly on VS2 growth, morphology, and crystallinity, favoring the formation of abundant catalytic sites with facile electrolyte diffusion and electrolysis.
中文翻译：
溶剂调制自组装VS2层状微结构用于电催化水和尿素分解
尿素氧化反应（UOR）辅助水分解是一种很有前途的方法，可以有效处理阳极富含尿素的废水，并通过析氢反应（HER）在阴极平行产生绿氢（H 2 ）能量。然而，从地球上丰富的材料中轻松设计和制造坚固且廉价的电极是一个巨大的挑战。本工作报道了在水基反应介质中使用乙二醇作为添加剂，通过溶剂辅助水热法合成硫化钒 (VS 2 ) 微花结构，对形态和结晶度产生了显着影响。对2。此外，与 VS 2相比在纯水介质中制造的电极，乙二醇介导的 VS 2电极在 HER||UOR 与基于可逆氢电极 (RHE) 的三电极配置中作为阴极和阳极耦合后，显示出显着降低的总尿素分解电位与 RHE 的 1.75 V 的常规水分解相比，在10 mA cm -2的电流密度下为 1.38 V。获得的对 UOR 和 HER 的高性能电催化活性可归因于乙二醇溶剂的影响，特别是对 VS 2生长、形态和结晶度的影响，有利于形成丰富的催化位点，易于电解质扩散和电解。
更新日期：2022-01-24
中文翻译：
溶剂调制自组装VS2层状微结构用于电催化水和尿素分解
尿素氧化反应（UOR）辅助水分解是一种很有前途的方法，可以有效处理阳极富含尿素的废水，并通过析氢反应（HER）在阴极平行产生绿氢（H 2 ）能量。然而，从地球上丰富的材料中轻松设计和制造坚固且廉价的电极是一个巨大的挑战。本工作报道了在水基反应介质中使用乙二醇作为添加剂，通过溶剂辅助水热法合成硫化钒 (VS 2 ) 微花结构，对形态和结晶度产生了显着影响。对2。此外，与 VS 2相比在纯水介质中制造的电极，乙二醇介导的 VS 2电极在 HER||UOR 与基于可逆氢电极 (RHE) 的三电极配置中作为阴极和阳极耦合后，显示出显着降低的总尿素分解电位与 RHE 的 1.75 V 的常规水分解相比，在10 mA cm -2的电流密度下为 1.38 V。获得的对 UOR 和 HER 的高性能电催化活性可归因于乙二醇溶剂的影响，特别是对 VS 2生长、形态和结晶度的影响，有利于形成丰富的催化位点，易于电解质扩散和电解。
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