【摘 要】
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In this paper,we report a facile strategy to synthesize Co-BDC-NH2 material,which is used as a precursor towards an excellent OER electrocatalyst by thermal ann
【机 构】
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College of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 26658
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In this paper,we report a facile strategy to synthesize Co-BDC-NH2 material,which is used as a precursor towards an excellent OER electrocatalyst by thermal annealing in nitrogen.Ultra-small Co/CoOx nanopar-ticles were uniformly dispersed on the rhombus N-doped carbon(NC)nanoflakes.Transmission electron microscopic,X-ray diffraction spectrometric,and X-ray photoelectron spectroscopic analyses revealed the coexistence of metallic Co and Co oxides nanoparticles.It was found that Co/CoOx@NC obtained at 500℃annealing temperature exhibited the highest electrocatalytic OER activity,with 307 and 375 mV overpotential to achieve 10 and 100 mA cm-2 current densities.Besides,thanks to the in-situ annealing process,Co/CoOx@NC showed excellent catalytic stability with 97.4％current density retention after 24 h electrolysis at 1.66 V vs.RHE electrode potential.Further investigations revealed that the ultra-small Co/CoOx nanoparticles distributed on N-doped carbon template contribute significantly towards OER electrocatalysis through enlarging the activity surface areas and enhancing the intrinsic electro-chemical activity due to the presence of metallic Co.
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对层状金属氧化物(LDO)在CO
2吸附及其催化加氢转化方面的应用进行了综述,探讨了其优势和可能存在的问题。分析发现:LDO由于具有发达的孔道结构及表面丰富可调的碱性位点,增强了对CO
2的吸附能力,同时其特殊的层状结构可促进活性金属的均匀分散和相互作用,提高了CO
2的加氢催化活性;利用其前驱——层状双金属氢氧化物(LDHs)的层板化学组成可调控性、层间阴离子可交换性以及热稳定性,再通过选择制备方法和控制反应条件可得到CO
2
“H2-free” HDO is a revolutionary route to circumvent the limitations of H2-fed HDO reactors for biomass upgrading.This work demonstrates the viability of this