首页|Enhanced photocatalytic hydrogen production from Co-MOF/CN by nitrogen and sulfur co-doped coal-based carbon quantum dots

Enhanced photocatalytic hydrogen production from Co-MOF/CN by nitrogen and sulfur co-doped coal-based carbon quantum dots

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A novel composite photocatalyst for photocatalytic decomposition of water for hydrogen evolution was successfully synthesized by in-situ growth of nitrogen and sulfur co-doped coal-based carbon quantum dots(NSCQDs)nanoparticles on the surface of sheet cobalt-based metal-organic framework(Co-MOF)and graphitic carbon nitride(g-C3N4,CN).The structure and properties of the obtained catalysts were systematically analyzed.NSCQDs effectively broaden the absorption of Co-MOF and CN in the visible region.The new composite photocatalyst has high hydrogen production activity and the hydrogen production rate reaches 6254 μmol/(g·h)at pH=9.At the same time,NSCQDs synergy Co-MOF/CN composites have good stability.After four cycles of hydrogen production,the performance remains relatively stable.The transient photocurrent response and Nyquist plot experimental results further demonstrate the improvement of carrier separation efficiency in composite catalysts.The semiconductor type(n-type semiconductor)of the single-phase catalyst was determined by the Mott-Schottky test,and the band structure was analyzed.The conductive and valence bands of CN are-0.99 and 1.72 eV,respectively,and the conduction and valence bands of Co-MOF are-1.85 and 1.33 eV,respectively.The mechanism of the photocatalytic reaction can be inferred,that is,Z-type heterojunction is formed be-tween CN and Co-MOF,and NSCQDs was used as cocatalyst.

Nitrogen and sulfur co-dopedCoal-based carbon quantum dotsCo-MOFCNPhotocatalytic hydrogen evolutionRare earths

Shiyong Xu、Mei Li、Yijun Wang、Caiyun Gao、Rongsheng Xu、Zhiliang Jin

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School of Chemistry and Chemical Engineering,North Minzu University,Yinchuan,750021,China

Ningxia Key Laboratory of Solar Chemical Conversion Technology,North Minzu University,Yinchuan,750021,China

State Key Laboratory of National Ethnic Affairs Commission Chemical Technology,North Minzu University,Yinchuan,750021,China

宁夏回族自治区自然科学基金国家自然科学基金Innovative Team for Transforming Waste Cooking Oil into Clean Energy and High Valueadded Chemicals,ChinaNingxia Lowgrade Resource High Value Utilization and Environmental Chemical Integration Technology Innovation Team Project,China

2023AAC0328521666001

2024

10.1016/j.jre.2023.09.020

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(5)
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