Importance of Phase Purity in Two-Dimensional β-Co(OH)2 for Driving Oxygen Evolution

被引：7

作者：

De Silva, Oshadie ^{[1
]}

Singh, Mandeep ^{[1
]}

Mahasivam, Sanje ^{[1
]}

Mahmood, Nasir ^{[2
]}

Murdoch, Billy James ^{[3
]}

Ramanathan, Rajesh ^{[1
]}

Bansal, Vipul ^{[1
]}

机构：

[1] RMIT Univ, Ian Potter NanoBioSensing Facil, Nanobiotechnol Res Lab, Sch Sci, Melbourne, Vic 3000, Australia

[2] RMIT Univ, Sch Engn, Melbourne, Vic 3000, Australia

[3] RMIT Univ, RMIT Microscopy & Microanal Facil RMMF, Sch Sci, Melbourne, Vic 3000, Australia

来源：

ACS APPLIED NANO MATERIALS | 2022年 / 5卷 / 09期

基金：

澳大利亚研究理事会;

关键词：

beta-Co(OH)(2); CoOOH; 2D; nanosheets; oxygen evolution reaction (OER); phase purity; COBALT HYDROXIDE; ALPHA-CO(OH)(2) NANOSHEETS; ALPHA-COBALT; NANOSTRUCTURES; OXIDATION; COOOH; CO3O4;

D O I：

10.1021/acsanm.2c03468

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The design and development of efficient electrocatalysts for water splitting, particularly for thermodynamically unfavorable oxygen evolution reaction (OER), is one of the foremost requirements to develop sustainable hydrogen production technologies. This requires a thorough understanding of various characteristics of an electrocatalyst that can influence its performance. Layered hydroxides, such as beta-Co(OH)(2), are promising OER electrocatalysts; however, they tend to transform to the CoOOH phase during synthesis. In this work, we have evaluated the influence of the oxyhydroxide impurity phase on the OER activity of two-dimensional beta-Co(OH)(2). Our study reveals that the CoOOH impurity in beta-Co(OH)(2) nanosheets improves the thermodynamics of OER (overpotentials of 322 and 369 mV at a 10 mA.cm(-2) current density in the presence and absence of impurity), while adversely impacting the reaction kinetics (Tafel slopes of 142.3 and 96.5 mV.dec(-1), respectively). These concurrent synergistic and antagonistic behaviors of the CoOOH phase are interesting and emphasize the importance of well-controlled synthesis conditions and thorough catalyst characterization to develop sustainable catalytic technologies.

引用

页码：12209 / 12216

页数：8