0D CoP cocatalyst/2D g-C3N4 nanosheets: An efficient photocatalyst for promoting photocatalytic hydrogen evolution
0D CoP cocatalyst/2D g-C3N4 nanosheets: An efficient photocatalyst for promoting photocatalytic hydrogen evolution
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0D CoP助催化剂/2D g-C3N4纳米片：一种促进光催化析氢的高效光催化剂
DOI：
10.1111/jace.16443
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发表时间：
2019
影响因子：
3.9
通讯作者：
Liu Zhifeng
中科院分区：
文献类型：
--
作者：
Han Changcun;Zhang Tong;Cai Qijun;Ma Chonghao;Tong Zhengfu;Liu Zhifeng
在这项工作中，磷化钴（CoP）纳米粒子成功地修饰在一个cobig-C3 N4纳米片光催化剂通过原位化学沉积。CoP/g-C3 N4复合半导体异质结界面形成的内建电场可以加速光生电荷空穴对的传输和分离，有效提高光催化性能。TEM、HRTEM、XPS和SPV分析表明，CoP/g-C3 N4形成了稳定的异质界面，有效地增强了光生电子-空穴分离。维斯DRS分析表明，该复合材料比纯g-C3 N4具有更强的可见光吸收，是一种可见光驱动的光催化剂。该工艺以NaH 2 PO 2和CoCl 2为磷源和钴源，典型的CoP制备过程可在3小时内完成。在可见光照射下，3.0 mol% CoP/g-C3 N4的最佳放氢速率约为15.1 μmol h−1。通过光催化分解水来评价CoP/g-C3 N4材料的光催化活性和稳定性。分析了复合催化剂的微观结构与光催化性能之间的内在联系，揭示了光催化反应机理。
In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g‐C3N4nanosheet photocatalysts by in situ chemical deposition. The built‐in electric field formed by heterojunction interface of the CoP/g‐C3N4composite semiconductor can accelerate the transmission and separation of photogenerated charge‐hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g‐C3N4formed a stable heterogeneous interface and effectively enhanced photogenerated electron‐hole separation. UV‐vis DRS analysis showed that the composite had enhanced visible light absorption than pure g‐C3N4and was a visible light driven photocatalyst. In this process, NaH2PO2and CoCl2are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H2evolution rate of 3.0 mol% CoP/g‐C3N4is about 15.1 μmol h−1. The photocatalytic activity and stability of the CoP/g‐C3N4materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.