Controllable synthesis of silver cyanamide as a new semiconductor photocatalyst under visible-light irradiation
Controllable synthesis of silver cyanamide as a new semiconductor photocatalyst under visible-light irradiation
复制标题
可见光照射下可控合成新型半导体光催化剂氰氨化银
DOI：
10.1039/c3ta10868f
复制
发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Lin, Jianhua
中科院分区：
文献类型：
--
作者：
Zhao, Wei;Liu, Yufeng;Lin, Jianhua
半导体制冷作为实现可持续能源生产和实现环境修复的一种有前途的策略，引起了人们极大的兴趣。在过去的几十年中，人们一直在追求高效和可见光驱动的半导体光催化剂，以克服广泛研究的TiO 2光催化剂的缺点。在这里，我们报告了一种新的n型银氰氨化物（Ag2NCN）半导体的直接带隙约为2.30 eV，它可以利用可见光的水的光氧化和有机污染物的分解。为了研究Ag2NCN薄膜的光学、光催化和光电化学性质，我们采用不同的水溶液法制备了Ag2NCN纳米颗粒（<100 nm）、微米颗粒（20 μ m）和纳米颗粒（20 nm）薄膜。结果表明，所制备的纳米粒子具有独特的吸收和光致发光特性。纳米/微米粒子对有机染料的降解表现出很高的光催化性能，表明Ag2NCN是一种高效的可见光催化剂。此外，纳米颗粒薄膜可以组装成光电化学电池，用于水的光氧化和光电流产生。这些发现为过渡金属氰氨化物作为太阳能利用的功能材料提供了第一个证据。
Semiconductor photocatalysis has attracted great interest as a promising strategy to achieve sustainable energy generation and realize environmental remediation. High-efficiency and visible-light-driven semiconductor photocatalysts have been pursued during the past decades to overcome the drawbacks of the widely-studied TiO2 photocatalyst. Here, we report a new n-type silver cyanamide (Ag2NCN) semiconductor with a direct band gap of about 2.30 eV, which can utilize visible-light for water photooxidation and organic contaminant decomposition. In order to investigate the optical, photocatalytic and photoelectrochemical properties, various aqueous solution methods are developed to synthesize Ag2NCN nanoparticles (<100 nm), microparticles (up to 20 μm) and nanograined (20 nm) thin films. It is found that the as-prepared nanoparticles exhibit unique absorption and photoluminescence properties. Nano/microparticles show high photocatalytic performance for organic dye degradation, indicating that Ag2NCN is an efficient visible-light-driven photocatalyst. Additionally, nanograined thin films can be assembled into a photoelectrochemical cell for water photooxidation and photocurrent generation. These findings have provided the first evidence that transition metal cyanamides may be promising functional materials for solar energy utilization.