Nickel-Based Hybrid Material for Electrochemical Oxygen Redox Reactions in an Alkaline Medium
ACS APPLIED ENERGY MATERIALS(2020)
摘要
Synthesizing active and stable oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts in a cost effective way remains a challenge in the fuel cells and rechargeable metal-air batteries community. Here, we report a nickel-based hybrid material, namely [Ni-3(BPE)(4)(BTB)(2)(H2O)(2)]center dot 2DMF center dot 2H2O [where BTB = 1,3,5-tris(4-carboxyphenyl)benzene and BPE = 1,2-bis(4-pyridyl) ethane] and Ni-BTB-BPE for ORR and OER. Structural analysis of Ni-BTB-BPE showed that the BTB ligand connectivity with a nickel center formed an interesting two-dimensional Kagome-type lattice and BPE ligand connectivity with the layers to form the three-dimensional structure. With the aid of the Ni (E-(Ni())2+/3+) redox site, the electrochemical surface concentration of Ni2+/3+ was calculated to be 5.49 nM/cm(2). Ni-BTB-BPE/C exhibited 108.95 A g(Ni)(-1) of ORR mass activity at 0.75 V versus RHE. The catalyst showed a completely methanol tolerant ORR performance. The four-electron turn-over frequency (2.24 electrons [Ni](-1) s(-1) at 0.70 V vs RHE) of Ni-BTB-BPE/C was found to be 2.67 times higher than that of the two-electron one, which indicates the higher selectivity of Ni-BTB-BPE/C catalyst in the four-electron pathway (OH- as a predominant product). Ni-BTB-BPE/C has performed ORR/OER activity with a bi-functionality index value of 0.9 at 1 mA cm(-2).
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关键词
coordination polymer,oxygen reduction reaction,oxygen evolution reaction,electrocatalyst,fuel cell
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