Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 36, Pages 13793-13804Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c04966
Keywords
water splitting; Fe doped; cobalt phosphate; hydrogen evolution reaction; overall water splitting; deep eutectic solvent
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Funding
- National Natural Science Foundation of China [21962008, 51464028]
- Candidate Talents Training Fund of Yunnan Province [2017PY269SQ, 2018HB007]
- Yunnan Province Excellent Youth Fund Project [2020FI005]
- Yunnan Ten Thousand Talents Plan Young & Elite Talents Project [YNWR-QNBJ-2018-346]
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The design and synthesis of highly efficient and low-cost bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are crucial for electrochemical water splitting associated with clean and renewable energy technologies. In this study, a novel Fe-doped cobalt-phosphate nanosheet-packed 3D microsphere developed on a planar Cu substrate (FexCo3-x(PO4)(2)/Cu) with a tunable stoichiometry (x = 0-0.64) is fabricated using a facile one-step electrodeposition approach from a Reline-based deep eutectic solvent. The Fe-tuned integrated electrode exhibits superior HER electrocatalytic performance over a wide pH range and robust bifunctional catalytic activity for overall water splitting in alkaline media. The optimized Fe0.43Co2.57(PO4)(2)/Cu needs overpotentials of only 108.1, 128.8, and 291.5 mV to drive a promising current density of 100 mA cm(-2) in 1.0 M KOH, 0.5 M H2SO4, and 1.0 M phosphate-buffered saline, respectively, along with outstanding durability. Moreover, the developed Fe0.43Co2.57(PO4)(2)/Cu can catalyze both HER and OER in 1.0 M KOH with high efficiency and robust stability over 100 h. The remarkably enhanced performance of the integrated FexCo3-x(PO4)(2)/Cu can be ascribed to the modification of the O active electronic property in phosphate with Fe doping, which results in optimal hydrogen adsorption on the active sites. Further, the unique 3D microsphere structure coupled with a 2D nanosheet internal architecture offers abundant catalytic interfaces with more active sites and favorable transfer kinetics. All these synergistically contribute to its superior electrochemical performance.
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