纳秒脉冲激光超快速合成碳纳米管负载高分散铂纳米颗粒的电催化析氢性能  

Ultra-fast Synthesis of Highly Dispersed Pt Nanoparticles Loaded on Carbon Nanotubes by Nanosecond Pulsed Laser for Hydrogen Evolution Reaction

作　　者：文颖 陈荣生[1] 倪红卫[1] WEN Ying;CHEN Rongsheng*;NI Hongwei*(State Key Laboratory of Refractories and Metallurgy,School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学材料与冶金学院,耐火材料与冶金国家重点实验室,武汉430081

出　　处：《高等学校化学学报》2025年第3期81-89,共9页Chemical Journal of Chinese Universities

基　　金：国家重点研发计划项目(批准号:2020YFC1909702-4);国家自然科学基金(批准号:U21A20317)资助。

摘　　要：在酸性环境中,最有效的析氢反应(HER)催化剂仍然是铂族金属及其合金.通常,Pt基催化剂载体上活性组分颗粒的大小和分布是影响催化剂活性、选择性和稳定性的重要因素.本文通过纳秒脉冲激光辐照法将具有均匀尺寸分布的高度分散的Pt纳米颗粒负载到多壁碳纳米管(MWCNT)上,并应用于HER.激光辐照MWCNT产生的等离子体可以有效地将H_(2)PtCl_6还原为金属Pt原子,然后在MWCNT的侧壁上生成直径为2~3 nm的高度分散的Pt纳米颗粒.在激光辐照过程中产生的缺陷会造成部分Pt纳米颗粒嵌入MWCNT壁.与物理混合MWCNT/Pt催化剂相比,L-Pt/MWCNT中Pt(0)和MWCNT之间的电子相互作用促进了反应动力学过程.L-Pt/MWCNT催化剂表现出对HER的高活性和良好稳定性,在电流密度为10 mA/cm^(2)时,过电位为39 mV,其塔菲尔斜率为15 mV/dec.The most efficient catalysts for hydrogen evolution reaction(HER)under the acidic environment are still based on platinum group metals and its alloys.Usually,the size and distribution of the active component particles on the carrier of Pt-based catalysts are important factors affecting the activity,selectivity,and stability of the catalysts.In this paper,highly dispersed Pt nanoparticles with uniform size distribution were loaded on multi-walled carbon nanotubes(MWCNT)by nanosecond pulsed laser irradiation for HER applications.Plasma generated by laser irradiation of MWCNT can efficiently reduce H_(2)PtCl_(6) to metallic Pt atoms,which then assembled highly dispersed Pt nanoparticles of 2—3 nm in diameter on the side walls of MWCNT.The defects caused some Pt nanoparticles to be embedded in the walls of MWCNT during laser irradiation.Comparied with mixed MWCNT/Pt catalysts,electronic interactions between Pt(0)and MWCNT in L-Pt/MWCNT facilitate the reaction kinetics.The L-Pt/MWCNT catalyst exhibited high activity and good stability towards HER,with an overpotential of 39 mV at a current density of10 mA/cm^(2) and a Tafel slope of 15 mV/dec.

关 键 词：析氢反应 铂纳米颗粒 碳纳米管 纳秒脉冲激光 

分 类 号：O643[理学—物理化学] O646[理学—化学]