Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 10, Pages 5288-5294Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta00489k
Keywords
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Funding
- National Key RAMP
- D Program of China [2017YFA0207800]
- National Natural Science Foundation of China (NSFC) [21771079]
- Jilin Province Science and Technology Development Plan [20170101141JC]
- Young Elite Scientist Sponsorship Program by CAST
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT)
- Fok Ying Tung Education Foundation [161011]
- Postdoctoral Innovative Talent Support Program [BX20180120]
- China Postdoctoral Science Foundation [2018M641771]
- National Natural Science Foundation of China [21621001]
- 111 Project [B17020]
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The oxygen evolution reaction (OER), as a kinetically sluggish half-reaction, plays a crucial role in the overall efficiency of some important electrochemical energy conversion systems. Herein we report the synthesis of nickel boride layers supported on a nickel plate via a direct solid boronization of the nickel substrate with amorphous boron powder. The resulting boronized nickel plate was studied systematically to illustrate its surface structural evolution and activity variation during the OER. The initial electrochemical OER testing process resulted in the in situ generation on the nickel boride of thin nanosheet films that consist of metaborate-containing oxyhydroxides, as the efficient catalytically active phase. Correspondingly, this electrochemically activated, boronized nickel plate exhibits a nearly ten-fold increase in catalytic activity compared to the nickel plate, and shows remarkable catalytic stability for over 1500 hours. The enhanced catalytic performance during electrochemical activation is attributed to synergistic catalytic effects from the thin nanosheet structural features of the oxyhydroxides (i.e., geometric optimization) and modification of the electronic structure of the oxyhydroxides by metaborates (i.e., electronic optimization). Our results provide new insights into boride-based oxygen evolution electrocatalysts, and provide a new strategy for the design of high-performance electrocatalytic materials for the OER.
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