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Hierarchically Structured Bifunctional Electrocatalysts of Stacked Core-Shell CoS1-xPx Heterostructure Nanosheets for Overall Water Splitting
被引:53
作者:
Boppella, Ramireddy
[1
]
Park, Jaemin
[1
]
Lee, Hyungsoo
[1
]
Jang, Gyumin
[1
]
Moon, Jooho
[1
]
机构:
[1] Yonsei Univ, Dept Mat Sci & Engn, 50 Yonsei Ro, Seoul 03722, South Korea
基金:
新加坡国家研究基金会;
关键词:
bifunctional electrocatalysts;
cobalt phosphosulfide;
core-shell nanosheets;
heterostructures;
water splitting;
HYDROGEN EVOLUTION;
HIGHLY EFFICIENT;
CARBON;
GRAPHENE;
NANOPARTICLES;
NANOCRYSTALS;
SEPARATION;
REDUCTION;
CATALYSTS;
INSIGHTS;
D O I:
10.1002/smtd.202000043
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:
The rational design and strategy of obtaining stable bifunctional electrocatalysts with unique functionalities are prerequisite to achieving robust catalytic activity. In this study, a composition-controlled partial sulfurization/phosphorization strategy to synthesize a doughnut-like 3D heterostructured electrocatalyst for overall water splitting is proposed, wherein core-shell 2D CoS(1-x)P(x)nanosheets decorated with N-doped carbon are self-assembled to form a hierarchical 3D architecture. The composition and phase structure in core-shell CoS(1-x)P(x)can be readily modified by controlling the liquid phase sulfurization and subsequent phosphorization, thereby modifying the electronic structure and activating the intrinsic active sites. The resulting CoS(1-x)P(x)benefits from the unique structural features including high accessible active surface area, adequate amount of reactive sites, intimate interfacial coupling between the components, interconnected electron highway, and accelerated charge/mass transfer ability. Consequently, the optimized CoS(0.46)P(0.54)electrocatalyst achieves a catalytic current density of 10 mA cm(-2)at overpotentials as low as 101 and 302 mV for hydrogen evolution reaction and oxygen evolution reaction, respectively, with outstanding long-term operational stability in alkaline solution. The CoS(0.46)P(0.54)couple enables an alkaline water electrolysis with a current density of 10 mA cm(-2)at a low cell voltage of 1.62 V, comparable to that of the RuO2||Pt/C couple (1.6 V).
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页数:12
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