期刊
ENERGY & FUELS
卷 36, 期 5, 页码 2722-2730出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c03446
关键词
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资金
- DST-SERB, India [ECR/2017/000670]
- IIT Mandi [IITM/SG/NRT-58]
- Advanced Materials Research Centre (AMRC), IIT Mandi
- Ministry of Education (MoE), India [IST-ID/107/2018, 57/2016]
In this report, a new Ni(II)-based coordination polymer CP 1 was prepared by a solvothermal method, along with another CP denoted as CP 2, and utilized as oxygen evolution reaction (OER) catalysts in alkaline solution. The bi-linker CP 1 exhibited higher OER activity compared to the mono-linker CP 2, indicating the importance of the additional π-conjugated organic linker mesaconic acid in enhancing OER activity.
Coordination polymers (CPs) based on transition metals have immense importance as electrocatalysts due to their diverse chemical structures coupled with redox-active metal centers. Among the earth-abundant transition metals, Ni(II) has huge importance as oxygen evolution reaction (OER) electro-catalyst owing to its high electrical conductivities, low cost, and most importantly, ability to exist in multiple oxidation states. In this report, a new Ni(II)-based CP [Ni(MCA)(bipy)(H2O)(2)](n) denoted as CP 1 (H(2)MCA = mesaconic acid, bipy = 4,4'-bipyridine) was prepared by a solvothermal method. The crystal structure analysis revealed that CP 1 has a two-dimensional structure having 8 angstrom x 12 angstrom rectangular channels. For comparison purposes, we have also synthesized another CP formulated as {[Ni(bipy)(3)(H2O)(2)]center dot(bipy)center dot(ClO4)(2)} CP 2 and tried to clarify the role of the coordinated mesaconate linker in OER. The developed CPs were directly utilized as OER catalysts in alkaline solution. The bi-linker CP 1 shows a higher OER activity compared to mono-linker CP 2 and requires an overpotential of 530 mV at a current density of 10 mA cm(-2). This indicates that the additional pi-conjugated organic linker mesaconic acid in CP 1 eases the formation of NiOOH species, which enhances the OER activity.
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