Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by th...Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by the methods of sweep potential, constant potential and constant current, and visible spectra during the electrolysis of phenol. A polyphenol film with thickness of 0.11 mm was obtained by the electrolysis of phenol at a constant potential of 0.70 V (versus Ag/AgCl with saturated KCl solution). Polyphenol film is inactive and stable in 2 mol L-1 H2SO4 solution, neutral solution and 3 mol L-1 NaOH solution and in the potential range between -0.95 and 1.35 V. The usable potential range is dependent on the pH value. Polyphenol has an ESR signal with a g factor of 2.0049. The conductivity of polyphenol is 1.2 x 10(-4) S cm(-1). In the solution of polyphenol dissolved in DMSO, the mobility of polyphenol anions is 8 x 10(-9) m(2) s(-1) V-1 at 20degreesC.展开更多
Suppression of photogenerated charge recombination is crucial for efficient photocatalytic hydrogen production.Homojunctions have garnered more attention than heterojunctions due to their superior crystal binding and ...Suppression of photogenerated charge recombination is crucial for efficient photocatalytic hydrogen production.Homojunctions have garnered more attention than heterojunctions due to their superior crystal binding and band structure matching.However,most homojunctions suffer from redox interference caused by continuous oxidizing and reducing phases that impede the ability to improve photocatalytic activity.Consequently,the preparation of homojunction photocatalysts with completely spatial separation of both in charge and redox phases remains challenging.Here,the preparation of a two-dimensional(2D)homojunction CeO_(2) with a back-to-back geometry and fully separated oxidizing and reducing phases is reported.The prepared CeO_(2) is composed of nanosheets with twocontrasting smooth and rough surfaces.Experimental and theoretical results indicate that the rough surface contains more highly reducing CeO_(2){220}and strongly visiblelight-absorbing CeO_(2){200}facets than the smooth surface.The 2D homojunction CeO_(2) produces three-times more hydrogen than normal CeO_(2) nanosheets,and even more than that of CeO_(2) nanosheets loaded with gold nanoparticles.This work presents a new homojunction photocatalyst model with completely spatial separation of both in charge and redox phases that is expected to inspire further research into homojunction photocatalysts.展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 20074027).
文摘Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by the methods of sweep potential, constant potential and constant current, and visible spectra during the electrolysis of phenol. A polyphenol film with thickness of 0.11 mm was obtained by the electrolysis of phenol at a constant potential of 0.70 V (versus Ag/AgCl with saturated KCl solution). Polyphenol film is inactive and stable in 2 mol L-1 H2SO4 solution, neutral solution and 3 mol L-1 NaOH solution and in the potential range between -0.95 and 1.35 V. The usable potential range is dependent on the pH value. Polyphenol has an ESR signal with a g factor of 2.0049. The conductivity of polyphenol is 1.2 x 10(-4) S cm(-1). In the solution of polyphenol dissolved in DMSO, the mobility of polyphenol anions is 8 x 10(-9) m(2) s(-1) V-1 at 20degreesC.
基金financially supported by the National Natural Science Foundation of China (Nos.22205084 and21805191)the Start-Up Funding of Jiangsu University of Science and Technology (No.1112932203)+2 种基金Guangdong Basic and Applied Basic Research Foundation (No.2020A1515010982)Shenzhen Stable Support Project (No.20200812122947002)Shenzhen Peacock Plan (No.20210802524B)。
文摘Suppression of photogenerated charge recombination is crucial for efficient photocatalytic hydrogen production.Homojunctions have garnered more attention than heterojunctions due to their superior crystal binding and band structure matching.However,most homojunctions suffer from redox interference caused by continuous oxidizing and reducing phases that impede the ability to improve photocatalytic activity.Consequently,the preparation of homojunction photocatalysts with completely spatial separation of both in charge and redox phases remains challenging.Here,the preparation of a two-dimensional(2D)homojunction CeO_(2) with a back-to-back geometry and fully separated oxidizing and reducing phases is reported.The prepared CeO_(2) is composed of nanosheets with twocontrasting smooth and rough surfaces.Experimental and theoretical results indicate that the rough surface contains more highly reducing CeO_(2){220}and strongly visiblelight-absorbing CeO_(2){200}facets than the smooth surface.The 2D homojunction CeO_(2) produces three-times more hydrogen than normal CeO_(2) nanosheets,and even more than that of CeO_(2) nanosheets loaded with gold nanoparticles.This work presents a new homojunction photocatalyst model with completely spatial separation of both in charge and redox phases that is expected to inspire further research into homojunction photocatalysts.
