Journal
CHEMICAL ENGINEERING JOURNAL
Volume 404, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126474
Keywords
Oxygen vacancies; B doped Co3O4; Oxygen evolution reaction; Hydrogen evolution reaction; Overall water splitting; NaBH4 hydrolytic dehydrogenation
Categories
Funding
- National Natural Science Foundation of China [21878201]
- Natural Science Foundation of Shanxi Province [201801D121059]
- 7th Youth Talent Support Program of Shanxi Province
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province [RZ18100353]
- Shanxi Scholarship Council of China [2017-034]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi OIT
Ask authors/readers for more resources
The development of earth abundant electrocatalysts is crucial for large-scale hydrogen production. This study introduces a self-supported VOB-Co3O4/NF nanowire array catalyst with trifunctional capabilities, exhibiting excellent stability, durability, and high current density for hydrogen and oxygen production reactions in alkaline media. Engineered boron and oxygen defects in the Co3O4 nanowires effectively modulate their electronic structure to enhance electrical conductivity and create numerous electroactive sites.
Developing earth abundant electrocatalyst is imperative to large-scale hydrogen production for transforming current fossil fuel-based economy into future renewable energy economy. In this paper, we report the synthesis of self-supported VOB-Co3O4/NF nanowire arrays directly grown on Ni foam, which can serve as a trifunctional catalyst for producing hydrogen and oxygen by electrolyzing water in alkaline media or producing hydrogen via hydrolyzing alkaline NaBH4 solution. The engineered boron and oxygen defects in Co3O4 nanowires prove to effectively modulate their electronic structure leading to the increased electrical conductivity and create a large quantity of electroactive sites. The resulting self-supported VOB-Co3O4/NF electrode delivers a current density of 50 mA cm(-2) at overpotentials of 184 mV for hydrogen evolution reaction (HER) and 315 mV for oxygen evolution reaction (OER) in 1.0 M KOH with excellent stability and durability. The VOB-Co3O4/NF as both cathode and anode requires 1.67 V to achieve a current density of 10 mA cm(-2) for overall water splitting reaction. Besides, VOB-Co3O4/NF presents much higher hydrogen generation rate (HGR) of 7055 mL min(-1) gcatalyst(-1) with activation energy (Ea) of ca. 29.7 kJ mol(-1). for hydrolytic dehydrogenation of alkaline NaBH4 solution, outperforming most of the reported non-noble metal-based catalysts and even precious metal catalysts.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available