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Preparation Of Heteroatom-doped Carbon-based Nanomaterials And Their Photocatalytic And Electrocatalytic Study

Posted on:2019-01-13Degree:MasterType:Thesis
Country:ChinaCandidate:Y MaoFull Text:PDF
GTID:2321330542993619Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
In this paper,the structure and catalytic activity of B-doped nitrogen vacancy g-C3N4 and Ni-doped porous carbon coated with molybdenum carbide were studied.As well as the influence of hetero-element doping on the catalytic performance of carbon-based nanomaterials and the reaction mechanism of catalytic reaction.1.Boron-doped nitrogen vacancies carbon nitride photocatalyst.Melamine was mixed with a certain amount of acetic acid and the mixture was completely dried at 120? in the pan.Then,the obtained powder was evenly ground in an agate mortar.The above milled powder and then was transferred to a lidded crucible,heated to 550 ? in a muffle furnace at a ramp rate of 5?/min and held for 4h.The obtained solid was washed several times with a mixed solution of ethanol and water to remove any impurities such as boric acid which may not be reacted.After thoroughly drying in a 60 ? oven,the final product was ground again in an agate mortar.This method is simple and easy to operate,and the acid treatment process can effectively increase the doping amount of boron element and meanwhile introduce the nitrogen vacancy into the catalyst during the calcination.Under the synergetic effect of nitrogen vacancies and boron doping,the molecular structure of carbon nitride will be distorted,further making a large number of in-plane B atoms become out-of-plane B atoms.Since out-plane B atoms have more B atoms than in-plane B atoms High catalytic activity,making the catalyst has excellent photocatalytic degradation.Bd-Nv-C3N4 showed a 10,7.5,and 5-fold increase in g-C3N4?Nv-C3N4 and Bd-C3N4,respectively,compared to the control g-C3N4.2.Ni doped porous carbon coated with molybdenum electrocatalyst,A certain amount of glucose,ammonium molybdate and nickel nitrate in a mass ratio of 1.5:1:0.05 ratio was put into 50mL deionized water.Then,5 g of silica balls were put into the above solution,stirred for 1 hour and sonicated for half an hour to transfer the solution to a high pressure autoclave with a tetrafluoroethylene substrate.Heated to 180 ? and incubated for 12 hours,after the reaction was cooled to room temperature,the reaction was dried in an oven at 80 ?.The dried product was heated to 800 ?.in a tube furnace under a nitrogen atmosphere at a heating rate of 5 ? min-1 and kept for 3 hours to obtain a black powder.Finally,the silica balls were removed with 2 mol/L NaOH solution,the pH value was neutralized and dried to obtain the final product(Ni-PDMC@C).The overpotential and Tafel slope of Ni-PDMC@C at current density of 10 mA·cm-2 are superior to other control groups,with an overpotential of 154 mV and a Tafel slope of 65 mV dec-1.At the same time Ni-PDMC@C also showed excellent cycle stability.
Keywords/Search Tags:carbon nitride, nitrogen defect, boron doping, photodegradation, nickel doping, electrocatalysis
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