期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134247
关键词
Catalyst; Heterostructure; Amorphous-crystalline interface; High current density; Overall water splitting
资金
- National Natural Science Foundation of China [21872040, 22162004]
- Opening Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology [2020K011]
- Excellent Scholars and Innovation Team of Guangxi Universities
- Innovation Project of Guangxi Graduate Education [YCBZ2021011]
This paper presents a hierarchical amorphous/crystalline heterostructure [(WO2-Ni17W3)/NiFe(OH)(x)] prepared by a wet chemical etching method as a catalyst, which exhibits extraordinary catalytic activity and stability for water electrolysis.
The catalyst for practical water electrolysis needs to maintain long-term stability and work effectively withstanding high-intensity gas evolution, which is extremely challenging. Heterostructure with an amorphous crystalline interface has been reported recently to availably enhance the catalytic performance of materials at high output. Herein, a wet chemical etching method realizes the hierarchical amorphous/crystalline heterostructure [(WO2-Ni17W3)/NiFe(OH)(x)]. It induces modulated electronic structure and abundant active sites with chemical stability, resulting in extraordinary catalytic activity for hydrogen evolution reaction (eta(10) = 31 mV, eta(1000) = 258 mV), oxygen evolution reaction (eta(50) = 240 mV, eta(1,000) = 336 mV), and overall water splitting (1.54/ 1.84 V at 50/1,000 mA cm(-2)). Besides, it can maintain at 1,000 mA cm(-2) stably for 120 h under simulated industrial condition (6.0 M KOH solution at 60 celcius) as a bifunctional catalyst. The coupled active phases and the in-situ formed heterojunction ensure an excellent performance at high current density. This strategy could be promoted to fabricate catalysts for practical water electrolysis.
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