探索双功能钴腐蚀剂在碱性条件下电解水过程中聚合物相互作用的作用

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-07-31 DOI:10.1039/D4YA00257A
Sameeta Sahoo, Elizabeth K. Johnson, Xiangru Wei, Sen Zhang and Charles W. Machan
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引用次数: 0

摘要

随着绿色氢燃料继续成为能源储存的重要选择,有关水电解反应的研究吸引了越来越多的关注。在有可能提高水电解效果的众多参数中,最重要的因素之一是开发一种高效的电催化剂。作为电催化剂的 Co(III)腐蚀剂的有效性主要是在均质、非水或酸性环境中进行研究的。我们报告了在碱性条件下使用异质化 Co(III) 腐蚀物作为双功能催化剂进行水分离的情况,发现在配体框架上加入烷基链会对电催化性能产生有利影响。通过亲核芳香取代反应,母体钴(III)5,10,15-三(五氟苯基)珊瑚 Co(tpfpc) 1 的氟苯基中取代基的对位被庚基 [Co(ttfphc)] 2 和十二烷基 [Co(ttfpdc)] 3 改性。由于烷基链的存在,这些新络合物的电子结构和由此产生的催化剂墨水的性质与母体络合物相比发生了显著的变化,在 pH 值为 14 的条件下进行水分离时催化起始电位和塔菲尔行为的变化就是证明。研究发现,所有催化剂都表现出具有合理稳定性的双功能行为,而烷基胺基团与催化剂墨水中的支撑聚合物之间的相互作用在改变珊瑚虫聚集方面起着重要作用,因此在催化剂墨水的沉积过程中也改变了活性位点的可及性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Exploring the role of polymer interactions during water electrolysis under basic conditions with bifunctional cobalt corroles†

Exploring the role of polymer interactions during water electrolysis under basic conditions with bifunctional cobalt corroles†

Exploring the role of polymer interactions during water electrolysis under basic conditions with bifunctional cobalt corroles†

With green hydrogen fuel continuing to be an important option for energy storage, studies on water-splitting reactions have attracted increasing attention. Within a multitude of parameters that have the potential to be explored to enhance water electrolysis, one of the most consequential factors is the development of an efficient electrocatalyst. The effectiveness of Co(III) corroles as electrocatalysts has largely been investigated in homogenous, non-aqueous or acidic environments. We report the use of heterogenized Co(III) corroles as bifunctional catalysts for water splitting under basic conditions, finding that the inclusion of alkyl chains on the ligand framework has a beneficial impact on electrocatalytic properties. Two new corroles have been isolated where the para positions in the fluorophenyl meso substituents of the parent cobalt(III) 5,10,15-tris(pentafluorophenyl)corrole Co(tpfpc)1 have been modified with heptyl, [Co(ttfphc)] 2 and dodecyl [Co(ttfpdc)] 3 amines via a nucleophilic aromatic substitution reaction. The electronic structure of these new complexes and properties of the resultant catalyst inks are significantly altered relative to the parent complex by the presence of the alkyl chains, as evidenced by changes in catalytic onset potentials and Tafel behavior during water splitting at pH 14. All catalysts were found to exhibit bifunctional behavior with reasonable stability, and the interactions of the alkyl amine groups with the supporting polymer in the catalyst ink have been found to have an important role in altering corrole aggregation and therefore Co active site accessibility during deposition of the catalyst inks.

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