Carbon and phosphorus co-doped carbon nitride hollow tube for improved photocatalytic hydrogen evolution.
Carbon and phosphorus co-doped carbon nitride hollow tube for improved photocatalytic hydrogen evolution.
复制标题
DOI：
10.1016/j.jcis.2022.02.057
复制
发表时间：
2022-02
影响因子：
9.9
通讯作者：
Shuo Zhao;Yuepeng Liu;Yanyun Wang;Jiasheng Fang;Yiqiang Qi;Yuming Zhou;Xiaohai Bu;Shuping Zhuo
中科院分区：
文献类型：
--
作者：
Shuo Zhao;Yuepeng Liu;Yanyun Wang;Jiasheng Fang;Yiqiang Qi;Yuming Zhou;Xiaohai Bu;Shuping Zhuo
石墨碳氮化合物作为一种迷人的共轭聚合物，已成为一种可见光光催化剂。块状氮化碳光吸收能力有限，表面活性中心少，光生载流子分离慢，导致其催化活性差。本文以三聚氰胺和聚丙烯酰胺为前体，磷酸为磷源，通过水热-热共聚合的方式，研制出一种新型光学性能可调的碳（C）和磷（P）共掺杂的氮化碳空心管（CPCN）。研究了聚丙烯酰胺含量对复合材料形貌和光催化性能的影响。这种特殊的空心管有利于提高活性位点和可见光捕获能力。同时，C和P共掺杂导致窄的带隙和快速的电荷转移，从而能够在可见光照射下增强催化活性。其中，CPCN-50在λ > 400 nm时的产氢速率为4485.7 μmol h−1g− 1，高于纯氮化碳CN（902.3 μmol h−1g−1）、掺C样品CCN-50（3741.1 μmol h−1g−1）和掺P样品CNP（2280.0 μmol h−1g−1）。这表明C、P共掺杂在促进光致电荷转移和阻碍复合方面具有协同效应。此外，在λ > 420 nm的照射下，CPCN-50的H2生成速率（3024.5 μmol h− 1g − 1）高于CN（400.8 μmol h−1g −1）。该方法可用于合成高效的光催化剂，用于CO2还原、H2释放等。
Graphitic carbon nitride, regarded as a charming conjugated polymer, has been a visible light photocatalyst. Bulk carbon nitride endures the limited light absorption ability, few surface active sites and slow separation of photoinduced charge carriers, leading to the poor catalytic activity. Herein, a new carbon (C) and phosphorus (P) co-doped carbon nitride hollow tube with adjustable optical property (CPCN) was developed by applying melamine and polyacrylic amide as the precursors and phosphoric acid as the P source via a hydrothermal-thermal copolymerization way. The effects of polyacrylic amide content on the morphology and photocatalytic performance were intensively investigated. The special hollow tube favors the improvement of active sites and visible light harvesting ability. Meantime, C and P co-doping results in the narrow band gap and rapid charge transfer, thus enabling an enhanced catalytic activity under visible light irradiation. Particularly, CPCN-50 exhibits a remarkable H2generation rate of 4485.7 μmol h−1g−1under λ > 400 nm, which is higher than pure carbon nitride CN (902.3 μmol h−1g−1), C doped sample CCN-50 (3741.1 μmol h−1g−1) and P doped sample CNP (2280.0 μmol h−1g−1). It implies that C, P co-doping exhibits a synergistic effect on boosting photoinduced charge transfer and hindering the recombination. Moreover, CPCN-50 illustrates a higher H2generation rate (3024.5 μmol h−1g−1) than CN (400.8 μmol h−1g−1) under λ > 420 nm irradiation. This way developed in this work might exhibit utility for synthesizing highly effective photocatalysts for the CO2reduction, H2evolution and so on.