TiO2基两相复合材料的制备及其电催化析氢性能
Preparation of TiO2 based two-phase composite and its electrocatalytic hydrogen evolution performance
赵文潇 1裴刘军 1贾伟科 1王际平1
作者信息
- 1. 上海工程技术大学纺织服装学院,上海 201620;上海纺织化学清洁生产工程技术研究中心,上海 201620
- 折叠
摘要
TiO2作为一种价格低廉、应用广泛的金属氧化物,加工改性后提高其催化活性,可广泛应用于电催化领域.本文制备了一种亲水性锐钛矿型TiO2多级花状结构,在其表面负载PdCu NPs,所得PdCu NPs@TiO2两相复合纳米材料具有更大的比表面积和更多的活性位点.通过扫描电子显微镜、透射电子显微镜、X射线衍射仪、X射线光电子能谱及BET分析等手段对PbCu NPs质量分数为5%、10%和20%的PdCu NPs@TiO2样品进行表征,并利用电化学测试观察其催化活性的变化.结果表明,所制备的Pd2Cu NPs@TiO2-10(Pd与Cu之比为2∶1)两相复合纳米材料作为析氢反应(HER)电催化剂性能最优,具有较低的水吸附/解离能垒和H中间体脱附能垒.在酸性条件下电流密度达到10mA/cm2时具有35.8mV的低过电位,46.3mV/dec的低Tafel斜率,表现出优异的电催化活性.
Abstract
As an inexpensive and widely used metal oxide,TiO2 with improved catalytic activity after processing and modification can be used in electrocatalysis field.In this paper,a hydrophilic anatase TiO2 with hierarchical flower-like structure was prepared and loaded with PdCu NPs on its surface.The obtained two-phase composite nanomaterial PdCu NPs@TiO2 had a large specific surface area and abundant active sites.The samples with different compositions of 5%,10%and 20%PdCu NPs@TiO2 were characterised by SEM,TEM,XRD,XPS and BET,and the activity changes of electrocatalytic hydrogen precipitation were evaluated using electrochemical tests.The results showed that the prepared Pd2Cu NPs@TiO2-10(Pd∶Cu=2∶1)HER electrocatalyst performed the best with low water adsorption/dissociation and H intermediate desorption energy barriers.It had a low overpotential of 35.8mV and a low Tafel slope of 46.3mV/dec at current density up to 10mA/cm2 under acidic condition.
关键词
二氧化钛/钯铜合金颗粒/催化剂/制氢/复合材料Key words
titanium dioxide/palladium copper alloy particles/catalyst/hydrogen production/composites引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据