Construction of self-supporting, hierarchically structured caterpillar-like NiCo2S4 arrays as an efficient trifunctional electrocatalyst for water and urea electrolysis

被引:76
作者
Song, Wenjiao [1 ]
Xu, Mingze [1 ]
Teng, Xue [1 ]
Niu, Yanli [1 ]
Gong, Shuaiqi [1 ]
Liu, Xuan [1 ]
He, Xiaoming [2 ]
Chen, Zuofeng [1 ]
机构
[1] Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, Shanghai 200092, Peoples R China
[2] Shaanxi Normal Univ, Sch Chem & Chem Engn, Xian 710119, Peoples R China
基金
中国国家自然科学基金;
关键词
BIFUNCTIONAL ELECTROCATALYST; HYDROGEN EVOLUTION; HIGHLY EFFICIENT; NANOWIRE ARRAYS; NICKEL FOAM; NI FOAM; DURABLE ELECTROCATALYSTS; ALKALINE MEDIA; OXYGEN; CATALYSTS;
D O I
10.1039/d0nr08395j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this study, we have developed intriguing self-supporting caterpillar-like spinel NiCo2S4 arrays with a hierarchical structure of nanowires on a nanosheet skeleton, which can be used as a self-supporting trifunctional electrocatalyst for the oxygen evolution reaction (OER), hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). The caterpillar-like NiCo precursor arrays are first in situ grown on carbon cloth (NiCo2O4/CC) by a facile hydrothermal reaction, which is followed by an anion exchange process (or sulfuration treatment) with Na2S to form self-supporting spinel NiCo2S4 arrays (NiCo2S4/CC) with a roughened nanostructure. Taking advantage of the bimetallic synergistic effect, the unique hierarchical nanostructure, and the self-supporting nature, the resultant NiCo2S4/CC electrode exhibits high activities toward the OER, HER and UOR, which are highly superior to the monometallic counterparts of NiS nanosheets and Co9S8 nanowires on a carbon cloth substrate. The comparison of the three electrodes also indicates that the hierarchically structured bimetallic electrode combines the morphological and structural characteristics of monometallic Ni-based nanosheets and Co-based nanowires. When assembling a two-electrode electrolytic cell with NiCo2S4/CC as both the anode and cathode, an applied cell voltage of only 1.66 V is required to deliver a current density of 10 mA cm(-2) in water electrolysis. By using the same two-electrode setup, the applied voltage for urea electrolysis is further reduced to 1.45 V that produces hydrogen at the cathode with the same current density. This study paves the way for exploring the feasibility of future less energy-intensive and large-scale hydrogen production.
引用
收藏
页码:1680 / 1688
页数:9
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