MnO2/MnCo2O4/Ni heterostructure with quadruple hierarchy: a bifunctional electrode architecture for overall urea oxidation

被引:173
作者
Xiao, Changlong [1 ]
Li, Shuni [2 ]
Zhang, Xinyi [1 ]
MacFarlane, Douglas R. [1 ]
机构
[1] Monash Univ, Australian Ctr Electromat Sci, Sch Chem, Clayton, Vic 3800, Australia
[2] Shaanxi Normal Univ, Sch Chem & Chem Engn, Xian 710062, Shaanxi, Peoples R China
关键词
HYDROGEN EVOLUTION REACTION; ELECTROCHEMICAL ENERGY-STORAGE; EFFICIENT OXYGEN EVOLUTION; LAYERED DOUBLE HYDROXIDE; ACTIVE EDGE SITES; MESOPOROUS MNCO2O4; ASYMMETRIC SUPERCAPACITORS; NICO2O4; NANOSHEETS; NANOWIRE-ARRAY; FUEL-CELLS;
D O I
10.1039/c7ta00980a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A three-dimensional MnO2/MnCo2O4/Ni core-shell heterostructured electrode has been fabricated through a facile method. This electrode architecture consists of four levels of interconnected hierarchy: a primary macroporous Ni foam scaffold (>= 500 mm), an intermediate vertically-aligned MnCo2O4 core-nanoflake array (50-100 nm), topmost ultra-thin MnO2 nanosheets (similar to 10 nm) and short-range ordered mesopores (similar to 5 nm) on the MnO2 nanosheets. This freestanding, hierarchical porous electrode has advantages in enhancing electroactive surface area, enabling efficient mass transport through the porous structure. The heterostructured electrode exhibits a low onset potential (1.33 V vs. RHE), a high anodic peak current density (1000 mA cm(-2) g(-1) at 1.7 V vs. RHE) and long-term catalytic stability for urea oxidation, which surpasses previous reported electrode materials for urea electrolysis. Remarkably, the MnO2/MnCo2O4/Ni electrode possesses bifunctional catalytic activity for both urea oxidation and hydrogen evolution. A urea electrolytic cell with both anode and cathode using the heterostructured electrodes has been fabricated and a current density of 10 mA cm(-2) has been achieved at a cell voltage of 1.55 V. This noble metal-free quadruple hierarchy electrode shows potential as a new platform for multi-purpose applications.
引用
收藏
页码:7825 / 7832
页数:8
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