High-performance natural-sunlight-driven Ag/AgCl photocatalysts with a cube-like morphology and blunt edges via a bola-type surfactant-assisted synthesis
High-performance natural-sunlight-driven Ag/AgCl photocatalysts with a cube-like morphology and blunt edges via a bola-type surfactant-assisted synthesis
复制标题
通过波拉型表面活性剂辅助合成，具有立方体形态和钝边缘的高性能自然阳光驱动的 Ag/AgCl 光催化剂
DOI：
10.1039/c9cp05273a
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发表时间：
2020-02-21
影响因子：
3.3
通讯作者：
Liu, Minghua
中科院分区：
文献类型：
--
作者：
Wang, Nannan;Cheng, Ke;Liu, Minghua
基于AG/AGCL的结构最近引起了可见光驱动的等离子光催化剂的广泛关注，其中用各向异性形态形成的Ag/AgCl物种的制造被认为是增强其性能的有效方法。尽管过去十年在这个方向上取得了巨大的进步，但仍希望启动绿色和低成本方案，用于合成具有高催化活性的基于AG/AGCL的结构。使用表面活性剂辅助的合成方案，其中氯化物抗敌人的阳离子bola型表面活性剂既可以用作产生AGCl结构的反应物（即氯的来源），也可以用作导向模板，以帮助我们的各向异性结构的形成，我们以下报道说，可以简单地掉落水溶液来制造具有钝边缘的立方体状Ag/agcl硝酸银进入己烷1,6-双（三甲基铵）表面活性剂的乙醇溶液。重要的是，与使用常规t的表面活性剂制造的球状对应物相比，在可见光或天然阳光照射下，实用的立方体样结构具有显着改善的催化性能。已经揭示了光生孔在催化过程中可能是主要的活性物种。同时，我们的结果揭示了与球体样Ag/agCl结构相比，类似立方体的结构相对富含较小孔有效质量的高索引AgCl方面，从而促进更快的载体转移，促进载体，促进光生孔向表面的迁移参与光催化反应，并抑制载体重组，导致其增强的光催化表演。考虑到具有各种卤化物对抗及其复杂的模板效应的表面活性剂（Bola-，Gemini-，聚合物表面活性剂等）的巨大多样性，我们的新策略可能会为银/银卤化（AG/AGX，X = Cl，cl，agx = cl， BR，和I）基于各种形态的等离子结构，具有出色的光到化学能量转换能力。
Ag/AgCl-based structures have recently been receiving considerable attention as visible-light-driven plasmonic photocatalysts, wherein the fabrication of Ag/AgCl species shaped with an anisotropic morphology is considered to be an efficient way to enhance their performances. While the past decade has witnessed great progress in this direction, it is still strongly desired to initiate a green and low-cost protocol for the synthesis of Ag/AgCl based structures with high catalytic activity. Using a surfactant-assisted synthesis protocol, wherein a cationic bola-type surfactant of chloride counteranions serves both as a reactant (namely, source of chlorine) for the generation of AgCl structures and as a directing template to assist the formation of anisotropic structures, we herein report that cube-like Ag/AgCl with blunt edges could be fabricated simply by dropping an aqueous solution of silver nitrate into an ethanol solution of the hexane-1,6-bis(trimethylammonium chloride) surfactant. Importantly, compared to the sphere-like counterparts manufactured using a conventional tadpole surfactant, the as-fabricated cube-like structures exhibit substantially improved catalytic performances under visible-light or natural-sunlight irradiation. It has been revealed that photogenerated holes might serve as the main active species during the catalytic process. Meanwhile, our results have disclosed that in contrast to the sphere-like Ag/AgCl structures, the as-constructed cube-like structures are relatively enriched with high-index AgCl facets of smaller hole effective mass, which promote a faster carrier transfer, facilitate the migration of the photogenerated holes to the surface to be involved in photocatalytic reactions, and suppress carrier recombination, leading to their enhanced photocatalytic performances. Considering the tremendous diversity of surfactants (bola-, gemini-, polymeric surfactants etc.) with various halide counteranions and their sophisticated template effects, our new strategy might open up new opportunities for silver/silver halide (Ag/AgX, X = Cl, Br, and I)-based plasmonic structures with various morphologies and with superior light-to-chemical energy conversion capability.