Hydrogel-Derived Honeycomb Ni3S4/N,P-C as an Efficient Oxygen Evolution Catalyst
Hu, XJ (Hu, Xuejiao)[ 1 ] ; Li, TC (Li, Tiancheng)[ 3 ] ; Tang, YD (Tang, Yidan)[ 1 ] ; Wang, YR (Wang, Yirong)[ 1 ] ; Wang, A (Wang, Ao)[ 2 ]*; Fu, GT (Fu, Gengtao)[ 1,4 ]*; Li, XD (Li, Xiaodong)[ 1 ] ; Tang, YW (Tang, Yawen)[ 1 ] *（唐亚文）

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Chinese Acad Forestry, Inst Chem Ind Forest Prod, Jiangsu Prov Natl Engn Lab Biomass Chem Utilizat, Key Lab Biomass Energy & Mat, 16 Suojin 5th Village, Nanjing 210042, Jiangsu, Peoples R China
[ 3 ] Sichuan Univ, West China Hosp Stomatol, State Key Lab Oral Dis, Chengdu 610041, Sichuan, Peoples R China
[ 4 ] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore

CHEMISTRY-A EUROPEAN JOURNAL，201906,25(31),7561-7568

The development of high-efficiency electrocatalysts with low costs for the oxygen evolution reaction (OER) is essential, but remains challenging. Herein, a new synthetic process is proposed to prepare Ni3S4 particles embedded in N,P-codoped honeycomb porous carbon aerogels (Ni3S4/N,P-HPC) through a hydrogel approach. The preparation of Ni3S4/N,P-HPC begins with the sol-gel polymerization of tripolyphosphate, chitosan, and guanidine polymer that contains metal-binding sites, allowing for the uniform incorporation of Ni ions into the gel matrix, freeze-drying, and subsequent carbonization under an inert atmosphere. This synthesis resolves difficulties in synthesizing the pure Ni3S4 phase caused by the instability of Ni3S4 at high temperature, while affording good control of the porous structure and N,P-doping of carbon aerogels. The synergy between the structural advantages of N,P-carbon aerogels (such as easily accessible active sites, high specific surface area, and excellent electron transport) and the intrinsic electrochemical properties of Ni3S4 result in the outstanding OER performance of Ni3S4/N,P-HPC, with overpotentials as low as 0.37 V at 10 mA cm(-2). The work outlined herein offers a simple and effective method for the development of carbon-based electrocatalysts for renewable energy conversion.

文章链接：
https://onlinelibrary.wiley.com/doi/full/10.1002/chem.201901063

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