摘要
光催化析氢反应被认为是最有前途的制氢方法之一。炭材料是大规模、低成本光解水制氢的潜在催化材料,然而目前其光催化活性仍旧较低,还不足以满足实际应用要求。本文以廉价易得的泥炭为原料,通过与尿素共炭化制备了一种氮掺杂多孔炭,作为光热辅助可见光催化剂,利用炭材料优异的光热效应提高体系温度,进而提高光催化活性。在可见光照射下,这种泥碳基炭材料可使体系温度在15 min内从室温提高至55℃,光催化活性提高25%左右。系统考察了结晶度与氮掺杂含量对炭材料光催化性能的影响,发现在光热效应的促进下,N含量为4.88 at%且有适宜结晶度的炭材料表现出优异的光催化性能,析氢速率达到75.6μmol H_(2) g^(−1) h^(−1)。
Photocatalytic H_(2) evolution is considered one of the most important processes for H_(2) production.Carbon materials are potential candidates for large-scale and cost-effective photocatalytic water splitting,yet their activity needs to be further improved.We report the synthesis of nitrogen-doped porous carbons using peat moss as a precursor and urea as a nitrogen source.The proper-ties of carbons as photothermal-assisted visible-light photocatalysts were investigated.Due to the photothermal effect,the system temperature increased quickly to 55℃ in 15 min under visible light irradiation,which subsequently helps increase the photocatalytic activity by about 25%.It has been found that the crystallinity and nitrogen content of the carbon materials can be changed by chan-ging the carbonization temperature,and these have an impact on their photocatalytic activity.A peat-derived carbon carbonized at 800℃,with a N content of 4.88 at.%and an appropriate crystallinity has an outstanding photocatalytic activity with a high H_(2) evolu-tion rate of 75.6μmol H_(2) g^(−1) h^(−1) under visible-light irradiation.
作者
白金鹏
肖南
宋雪旦
肖剑
邱介山
BAI Jin-peng;XIAO Nan;SONG Xue-dan;XIAO Jian;QIU Jie-shan(State Key Lab of Fine Chemicals,Liaoning Key Lab for Energy Materials and Chemical Engineering,PSU-DUT Joint Center for Energy Research,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期585-594,共10页
New Carbon Materials
基金
国家自然科学基金(U2003216)
中央高校基本科研业务费专项资金(DUT20LAB131).
关键词
可见光
光热辅助
碳基光催化剂
Visible-light
Photothermal-assisted
Carbon based photocatalyst
