催化学报 ›› 2023, Vol. 51: 113-123.DOI: 10.1016/S1872-2067(23)64469-9

• 论文 • 上一篇    下一篇

MoSe2纳米片耦合Pt纳米颗粒用于高效双功能催化甲醇辅助水电解制氢

乔蔚a, 于立策a, 常进法b, 杨甫林a, 冯立纲a,*()   

  1. a扬州大学化学化工学院, 江苏扬州225002, 中国
    b中佛罗里达大学纳米科学技术中心, 奥兰多, 美国
  • 收稿日期:2023-04-28 接受日期:2023-06-05 出版日期:2023-08-18 发布日期:2023-08-31
  • 通讯作者: *电子信箱: ligang.feng@yzu.edu.cn, fenglg11@gmail.com (冯立纲).
  • 基金资助:
    国家自然科学基金(21972124);国家自然科学基金(22102105);国家自然科学基金(22272148)

Efficient bi-functional catalysis of coupled MoSe2 nanosheet/Pt nanoparticles for methanol-assisted water splitting

Wei Qiaoa, Lice Yua, Jinfa Changb, Fulin Yanga, Ligang Fenga,*()   

  1. aSchool of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
    bNanoScience Technology Center, University of Central Florida, FL 32826, Orlando, USA
  • Received:2023-04-28 Accepted:2023-06-05 Online:2023-08-18 Published:2023-08-31
  • Contact: *E-mail: ligang.feng@yzu.edu.cn, fenglg11@gmail.com (L. Feng).
  • Supported by:
    National Natural Science Foundation of China(21972124);National Natural Science Foundation of China(22102105);National Natural Science Foundation of China(22272148)

摘要:

化石燃料的大量消耗所带来的全球性挑战推动人们大力发展清洁和可持续的能源.氢能作为一种绿色、无污染的能源载体,是能源向绿色经济转换的关键,而利用可再生能源进行的电解水制氢被认为是实现绿色制氢的最佳选择.然而由于析氧反应(OER)的氧化电位(1.23V)较高,动力学缓慢,实际水电解需要更多的能量输入.具有低氧化电位的甲醇辅助水电解(0.016V)可以匹配可再生能源实现低能耗电解制氢,受到了广泛关注.开发高效的用于催化甲醇氧化(MOR)和析氢反应(HER)的双功能催化剂是实现这一愿景的前提.传统的Pt基催化剂容易受到阳极侧MOR过程中产生的CO中间体毒化,严重影响甲醇辅助水电解制氢的效率.
为了提升Pt基催化剂的催化活性和稳定性,一种有效的策略是引入合适的功能组分来促进催化反应.例如,贵金属颗粒和亲氧化成分(如过渡金属氧化物和磷化物)之间的金属-载体相互作用可以有效提高Pt基催化剂的抗CO中毒能力.过渡金属硒化物由于其优良的金属性和亲氧性作为催化促进剂受到越来越多的关注.硒化钼(MoSe2)具有良好的稳定性和导电性并且其2H相中的不饱和边缘具有水活化和解离活性,同时其吸附H原子的吉布斯自由能(ΔGH*)接近于零.考虑到MoSe2的高水活化/解离能力,本文成功制备了二维MoSe2纳米片负载的Pt纳米粒子复合催化剂(Pt/MoSe2)用于高效甲醇电解制氢.密度泛函理论计算表明,亲氧组分MoSe2显著优化了CO*和H*在Pt表面的吸附能,从而大大提高了甲醇辅助水电解的活性和稳定性.其中,Pt/MoSe2的甲醇氧化峰值电流密度为67.8mA cm-2,是商业Pt/C催化剂的2.5倍;在10mA∙cm-2的电流密度下,HER的过电位低至32mV.由Pt/MoSe2||Pt/MoSe2组装的两电极电解槽驱动10mA∙cm-2的电流密度仅需要0.67V的电压,与相同条件下的水电解相比节省了约1.09V的电池电压,大大降低了能量输入.催化性能的提升可以归因于改善的电荷转移以及Pt与亲氧MoSe2之间的金属-载体相互作用,该相互作用使得Pt从MoSe2载体上得到了部分电子,增加了Pt周围的电子密度,使得邻近Pt的d带中心下移,从而通过削弱CO‒Pt键进而增强了Pt位点的抗CO中毒能力.综上,本文对开发用于甲醇辅助水电解制氢的新型双功能催化剂具有借鉴意义.

关键词: 硒化钼, 二维结构, 制氢, 甲醇辅助水分解, Pt纳米颗粒

Abstract:

Efficient metal-support interaction induced high catalysis performance plays a significant role in energy conversion reactions. Herein, two-dimensional (2D) MoSe2 nanosheet-coupled Pt nanoparticles as efficient bi-functional catalysts were demonstrated for hydrogen production from the methanol-assisted water-splitting reaction. The oxophilic MoSe2 component with 2D structures optimized the adsorption of CO* and H* on Pt sites as demonstrated by spectroscopic and theoretical analysis, which resulted in enhanced catalytic ability in methanol-assisted water splitting reaction. The peak current density was 2.5 times higher than that of commercial Pt/C catalyst for methanol oxidation and a small overpotential of 32 mV was demanded to achieve a current density of 10 mA cm-2 for hydrogen evolution reaction in the methanol-containing electrolyte. When serviced as both cathode and anode, a low cell voltage of 0.66 V was required at 10 mA cm-2, significantly lower than that of 1.75 V required for water splitting. The high performance can be attributed to the oxophilicity of MoSe2 and their strong metal-support interaction that promoted the charge transfer and anti-CO poisoning of Pt sites. This work would be instructive for the development of novel bi-functional catalyst platforms for methanol-assisted water splitting in hydrogen production.

Key words: Molybdenum Selenide, 2D structure, Hydrogen production, Methanol-assisted water splitting, Pt nanoparticles