碲化铜双功能催化剂用于电催化肼氧化辅助制氢
The application of a bifunctional copper telluride catalyst for electrocatalytic hydrazine oxidation-assisted hydrogen production
杨翊铭 1王晟 1纪律律1
作者信息
- 1. 浙江理工大学材料科学与工程学院,杭州 310018
- 折叠
摘要
为获得活性位点丰富、导电性好与活性高的碲化铜(Cu7Te4)催化剂,通过对静电纺丝所制备的前驱体薄膜进行碳化处理得到Cu7Te4纳米颗粒与碳纳米纤维复合的材料Cu7Te4@CNFs;利用SEM、TEM、XRD、XPS等表征复合纤维材料的形貌和结构组成,并通过电化学测试技术分析复合材料的电催化析氢(HER)、肼氧化(HzOR)及HzOR辅助全水解性能.结果表明:Cu7Te4@CNFs具有丰富的催化活性位点,在碱性电解液中分别仅需394 mV的过电位和544 mV(vs.RHE)的工作电位,能产生10 mA/cm2的HER和HzOR催化电流密度,表现出良好的电催化性能;在400 mV的过电位和550 mV(vs.RHE)的工作电位下恒电位电解12 h,催化电流密度没有明显衰减,表现良好的电催化稳定性;HzOR辅助全水解仅需1.23 V的工作电压就能达到10 mA/cm2的催化电流密度,相较于传统全水解体系有效降低了 1.96 V的工作电压.该研究为高活性铜基双功能催化剂的设计合成以及在低能耗电解水制氢的研究策略方面提供了新的研究思路.
Abstract
To fabricate a Cu7Te4-based catalyst with abundant active sites,excellent conductivity and high catalytic activity,Cu7Te4@CNFs composites integrating Cu7Te4 nanoparticles and carbon nanofibers were synthesized by carbonizing the precursor films prepared by electrospinning.The morphology and structure composition of the synthesized Cu7Te4@CNFs composites were observed by SEM,TEM,XRD and XPS.The electrocatalytic performances of Cu7Te4@CNFs for hydrogen evolution reaction(HER),hydrazine oxidation reaction(HzOR)and HzOR-assisted overall water electrolysis were measured by a series of electrochemical techniques.The results demonstrated that Cu7Te4@CNFs was endowed with abundant catalytic active sites,could achieve the HER and HzOR catalytic current density of 10 mA/cm2 under an overpotential of 394 mV and a working potential of 544 mV(vs.RHE)in alkaline electrolyte,exhibiting excellent electrocatalytic performances.The catalyst was electrolyzed at constant potential for 12 h at an overpotential of 400 mV and a working potential of 550 mV(vs.RHE),respectively.And the catalytic current density did not decrease significantly but exhibit good electrocatalytic stability.The required cell voltage was only 1.23 V at 10 mA/cm2 for HzOR-assisted overall water electrolysis,which was 1.96 V lower compared with traditional water electrolysis.This study presents a novel research strategy in designing highly active bifunctional Cu-based catalysts toward energy-saving water electrolysis for hydrogen production.
关键词
静电纺丝/碲化铜/碳纳米纤维/析氢反应/肼氧化反应/电催化Key words
electrospinning/copper telluride/carbon nanofiber/hydrogen evolution reaction/hydrazine oxidation reaction/electrocatalysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据