Facilitated electron transfer by Mn dopants in 1-dimensional CdS nanorods for enhanced photocatalytic hydrogen generation
Facilitated electron transfer by Mn dopants in 1-dimensional CdS nanorods for enhanced photocatalytic hydrogen generation
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DOI：
10.1039/d2ta08409k
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发表时间：
2023-02-27
影响因子：
11.9
通讯作者：
Zheng, Weiwei
中科院分区：
文献类型：
--
作者：
MacSwain, Walker;Lin, Hanjie;Zheng, Weiwei
利用太阳光通过光催化分解水来生产氢气，对于绿色能源的收集和可持续发展是非常必要的。本工作合成了掺杂Mn2+的一维铂尖端硫化镉纳米棒(即一维锰：硫化镉-铂纳米棒)，用于光催化裂解水生成氢气。掺入Mn2+的一维CdS纳米粒子的寿命(类似ms)明显长于主体激子的寿命(类似ns)，有利于电荷分离；电子转移到金属铂尖端，提高了水分解氧化还原反应的光催化活性。与未掺杂的CdS-NR基光催化剂相比，掺杂Mn2+的CdS-NR基光催化剂的氢气产率提高了一个数量级。捕光半导体纳米材料中Mn2+离子长寿命激发态的电荷传输增强为提高光催化性能提供了新的契机。
Using sunlight to produce hydrogen gas via photocatalytic water splitting is highly desirable for green energy harvesting and sustainability. In this work, Mn2+ doped 1-dimensional (1D) CdS nanorods (NRs) with Pt tips (i.e., 1D Mn:CdS-Pt NRs) were synthesized for photocatalytic water splitting to generate hydrogen gas. The incorporation of Mn2+ dopants inside the 1D CdS NRs with a significantly longer lifetime (similar to ms) than that of host excitons (similar to ns) facilitates charge separation; the electron transfer to metal Pt tips leads to enhanced photocatalytic activity in water splitting redox reactions. The as-synthesized Mn2+ doped CdS NR-based photocatalyst generated an order of magnitude greater yield of hydrogen gas compared to the undoped CdS NR-based photocatalyst. The enhanced charge transport from the long lifetime excited state of Mn2+ dopants in light harvesting semiconductor nanomaterials presents a new opportunity to increase the overall photocatalytic performance.