Template-directed assembly of urchin-like CoSx/Co-MOF as an efficient bifunctional electrocatalyst for overall water and urea electrolysis,Inorganic Chemistry Frontiers

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Template-directed assembly of urchin-like CoSx/Co-MOF as an efficient bifunctional electrocatalyst for overall water and urea electrolysis
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-05-29 , DOI: 10.1039/d0qi00408a
Huizhu Xu _{1,

2,

3,

4,

5} , Ke Ye _{1,

2,

3,

4,

5} , Kai Zhu _{1,

2,

3,

4,

5} , Jinling Yin _{1,

2,

3,

4,

5} , Jun Yan _{1,

2,

3,

4,

5} , Guiling Wang _{1,

2,

3,

4,

5} , Dianxue Cao _{1,

2,

3,

4,

5}

Affiliation

Since the theoretical potential of urea electrolysis is lower than that of water splitting, urea electrolysis is an ideal method for hydrogen production. In this work, we have synthesized an urchin-like Co-based metal–organic framework (Co-MOF) grown on a Co(OH)₂ template by the gas phase method. As the specific surface area increased and more active sites were exposedcd, the low activity of the bulk MOF for electrocatalytic water splitting was overcome. Through a vulcanization reaction, surface vulcanized Co-MOF (CoS_x/Co-MOF) was synthesized. CoS_x/Co-MOF as a bifunctional catalyst has good catalytic performance toward the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and urea oxidation reaction (UOR). Compared with the catalytic activity of the OER, the potential of the UOR only needs 1.315 V (vs. RHE), while the potential of the OER needs 1.51 V (vs. RHE) at 10 mA cm⁻². The catalytic activity in the urea electrolysis of a CoS_x/Co-MOF||CoS_x/Co-MOF electrolyzer is much better than that in an alkaline electrolyte. The CoS_x/Co-MOF||CoS_x/Co-MOF electrolyzer only needs a cell voltage of 1.48 V to achieve a current density of 10 mA cm⁻² for a urea electrolytic cell in 1.0 M KOH with 0.5 M urea.

中文翻译：

以模板为导向的类顽固型CoSx / Co-MOF作为总水和尿素电解的高效双功能电催化剂

由于尿素电解的理论电位低于水分解法的理论电位，因此尿素电解是制氢的理想方法。在这项工作中，我们通过气相法合成了在Co（OH）₂模板上生长的类似海胆的Co基金属有机骨架（Co-MOF）。随着比表面积的增加和更多的活性位点被暴露，克服了本体MOF对电催化水分解的低活性。通过硫化反应，合成了表面硫化了的Co-MOF（CoS _x / Co-MOF）。CoS _x/ Co-MOF作为双功能催化剂，对氢气析出反应（HER），氧气析出反应（OER）和尿素氧化反应（UOR）具有良好的催化性能。与OER的催化活性相比，在10 mA cm ^-2下，UOR的电势仅需要1.315 V（相对于RHE），而OER的电势则需要1.51 V（相对于RHE）。CoS _x / Co-MOF || CoS _x / Co-MOF电解槽在尿素电解中的催化活性要比碱性电解质好得多。CoS _x / Co-MOF || CoS _x / Co-MOF电解槽仅需要1.48 V的电池电压即可达到10 mA cm ^-2的电流密度用于尿素电解池中的1.0 M KOH和0.5 M尿素。

更新日期：2020-07-14

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