Journal
ACS CATALYSIS
Volume 8, Issue 3, Pages 2236-2241Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b03594
Keywords
phosphorus-doping; Co3O4 nanoarray; DFT calculation; electrolysis; overall water splitting
Categories
Funding
- National Natural Science Foundation of China [21775078, 21575137]
- Shandong Provincial Natural Science Foundation [ZR2016JL007, JQ201713]
- Taishan Scholars Program
- Qingdao Municipal Science and Technology Bureau [16-5-1-44-jch]
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It It is vitally essential to design highly efficient and cost-effective bifunctional electrocatalysts toward water splitting. Herein, we report the development of P-doped Co3O4 nanowire array on nickel foam (P-Co3O4/NF) from Co3O4 nanowire array through low-temperature annealing, using NaH2PO2 as the P source. As a 3D catalyst, such P-Co3O4/NF demonstrates superior performance for oxygen evolution reaction with a low overpotential (260 mV at 20 mA cm(-2)), a small Tafel slope (60 mV dec(-1)), and a satisfying durability in 1.0 M KOH. Density functional theory calculations indicate that P-Co3O4 has a reaction free-energy value that is much smaller than that of pristine Co3O4 for the potential determining step of the oxygen evolution reaction. Such P-Co3O4/NF also performs efficiently for hydrogen evolution reaction, and a two-electrode alkaline electrolyzer assembled by P-8.6-Co3O4/NF as both anode and cathode needs only 1.63 V to reach a water-splitting current of 10 mA cm(-2).
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