Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 7, Pages 3341-3345Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta00149g
Keywords
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Funding
- National Key R&D Program of China [2018YFA0108300]
- Overseas High-level Talents Plan of China
- Overseas High-level Talents Plan of Guangdong Province
- 100 Talents Plan Foundation of Sun Yat-sen University
- Program for Guangdong Introducing Innovative and Entrepreneurial Teams [2017ZT07C069]
- Key Project of Guangdong Natural Science Foundation [2018B030311002]
- NSFC [22075321, 21673081, 21821003, 21890380]
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In this study, we report a W-doping-induced phase transition strategy to synthesize W-Ni3S2/Ni7S6 heterojunctions, which exhibit low overpotential and good stability, making them promising noble-metal-free OER catalysts.
Developing highly effective non-noble metal-based electrocatalysts is essential for real device applications but remains a challenge. Herein, we report a W-doping-induced phase transition strategy to synthesize W-Ni3S2/Ni7S6 heterojunctions. The W doping not only regulates the morphology of as-prepared catalysts to construct uniform nanorod arrays but also can induce the appearance of the Ni7S6 crystal phase to form W-Ni3S2/Ni7S6 heterojunctions which can enhance the intrinsic activity of the electrocatalyst. Consequently, W-Ni3S2/Ni7S6 shows a low overpotential (eta 1 = 202 mV and eta 2 = 285 mV in 1.0 M KOH for reaching a current density of 100 and 200 mA cm(-2), respectively), and good stability, and is a promising noble-metal-free OER catalyst.
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