Interface engineering via temperature-dependent self-transformation on SnS_(2)/SnS for enhanced piezocatalysis  

通过温度依赖性自转化在SnS_(2)/SnS上进行界面工程以增强压电催化

作　　者：Wenrou Tian Jun Han Najun Li Dongyun Chen Qingfeng Xu Hua Li Jianmei Lu 田文柔;韩俊;李娜君;陈冬赟;徐庆锋;李华;路建美(苏州大学材料与化学化工学部,江苏苏州215123)

机构地区：[1]College of Chemistry,Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215123,Jiangsu,China

出　　处：《Chinese Journal of Catalysis》2024年第9期166-179,共14页催化学报（英文）

基　　金：国家自然科学基金(21938006,51973148);国家重点技术研究发展计划(2020YFC1818400);江苏省高等学校重点学科发展计划(PAPD);江苏省研究生科研与实践创新计划资助的项目.

摘　　要：Heterojunction has been widely used in vibration-driven piezocatalysis for enhanced charges separation,while the weak interfaces seriously affect the efficiency during mechanical deformations due to prepared by traditional step-by-step methods.Herein,the intimate contact interfaces with shared S atoms are ingeniously constructed in SnS_(2)/SnS anchored on porous carbon by effective interface engineering,which is in-situ derived from temperature-dependent self-transformation of SnS_(2).Benefiting from intimate contact interfaces,the piezoelectricity is remarkably improved due to the larger interfacial dipole moment caused by uneven distribution of charges.Importantly,vibration-induced piezoelectric polarization field strengthens the interfacial electric field to further promote the separation and migration of charges.The dynamic charges then transfer in porous carbon with high conductivity and adsorption for significantly improved piezocatalytic activity.The degradation efficiency of bisphenol A(BPA)is 6.3 times higher than SnS_(2) and H_(2) evolution rate is increased by 3.8 times.Compared with SnS_(2)/SnS prepared by two-step solvothermal method,the degradation efficiency of BPA and H2 evolution activity are increased by 3 and 2 times,respectively.It provides a theoretical guidance for developing various multiphase structural piezocatalyst with strong interface interactions to improve the piezocatalytic efficiency.构建异质结是提高半导体催化剂中电荷分离效率的一种有效方法.并且,接触界面由于晶格失配容易引起电荷再分配,从而有利于增强极性,有望在调控压电性质方面发挥独特的优势.更重要的是,异质结通常需要高质量的界面,以便实现载流子的高效空间分离.然而,大多数异质结是通过传统的物理混合、两步水热/溶剂热或逐步沉积方法制备的,这些方法不利于形成紧密接触的界面,从而限制了电荷传递效率.鉴于SnS_(2)的温度依赖性相结构转变特性,本文提出了一种原位自转化策略来构建具有强相互作用的高质量界面,并协同吸附效应共同提升压电催化活性.首先将SnS_(2)纳米片锚定在ZIF-8衍生多孔碳(ZNC)表面,然后通过调控退火温度巧妙地原位合成了一系列相结压电催化剂(ZNC@SnS_(2)/SnS).通过扫描电镜和透射电镜观察了ZNC表面SnS_(2)纳米片在高温退火过程中的形貌变化,实验发现,随着退火温度升高纳米片逐渐倾斜并减小,最终形成板状的SnS.X射线粉末衍射和拉曼光谱结果表明,SnS_(2)向SnS转化的程度随退火温度升高而逐渐增大,500℃时SnS_(2)完全转化为SnS.X射线光电子能谱结果表明转化过程中Sn元素的化合价逐渐由Sn^(4+)转变为Sn^(2+),相结因存在Sn…S…Sn键而利于形成紧密接触的界面.氮气等温吸附脱附曲线结果表明,450℃退火得到的样品(450-SZNC)具有最大的比表面积.压电催化性能评价结果表明,450-SZNC表现出最佳的催化活性和良好的稳定性,对水中低浓度BPA的降解效率是SnS_(2)的6.3倍,其催化还原分解水析出H_(2)的速率是SnS_(2)的3.8倍.此外,原位自转化法制备的SnS_(2)/SnS_(2)对BPA的降解效率和H_2的析出速率分别是两步溶剂热法制备的SnS_(2)/SnS的3倍和2倍,压电力显微镜测试结果表明,450-SZNC表现出最高的压电响应.采用开尔文探针力显微镜、压电电流强度曲线和电化学阻抗曲线研�

关 键 词：Piezocatalysis SELF-TRANSFORMATION Phase junction Interfacial field Polarized field 

分 类 号：O643.36[理学—物理化学]