物理化学学报 >> 2025, Vol. 41 >> Issue (9): 100099.doi: 10.1016/j.actphy.2025.100099

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通过边缘活性位点调控解析光热催化中析氢与二氧化碳还原的界面竞争

洪佳楠, 许辰宇*(), 刘烟, 黎昌棋, 王梦琳, 张彦威*()   

  1. 浙江大学清洁能源利用国家重点实验室, 浙江 杭州 310027
  • 收稿日期:2025-03-22 修回日期:2025-04-19 录用日期:2025-04-28 发布日期:2025-07-04
  • 通讯作者: Email: mrxcy@zju.edu.cn (许辰宇)zhangyw@zju.edu.cn (张彦威)
  • 基金资助:
    浙江省自然科学基金(LDT23E06014E06); 国家自然科学基金(52341602); 浙江省自然科学基金(LQ24E060001); 国家重点研发计划(2023YFC3710800); 中央高校基本科研业务费专项资金(2022ZFJH04)

Decoding the interfacial competition between hydrogen evolution and CO2 reduction via edge-active-site modulation in photothermal catalysis

Jianan Hong, Chenyu Xu*(), Yan Liu, Changqi Li, Menglin Wang, Yanwei Zhang*()   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang Province, China
  • Received:2025-03-22 Revised:2025-04-19 Accepted:2025-04-28 Published:2025-07-04
  • Contact: Email: mrxcy@zju.edu.cn (Chenyu Xu)zhangyw@zju.edu.cn (Yanwei Zhang)
  • Supported by:
    the Zhejiang Provincial Natural Science Foundation of China(LDT23E06014E06); the National Natural Science Foundation of China(52341602); the Zhejiang Provincial Natural Science Foundation of China(LQ24E060001); the National Key Research and Development Project(2023YFC3710800); the Fundamental Research Funds for the Central Universities(2022ZFJH04)

摘要:

太阳能驱动的光热催化CO2与H2O转化是生产可持续燃料和化学品的重要途径。然而,析氢反应(HER)与CO2还原反应(CO2RR)之间的竞争导致产物选择性不理想。贵金属纳米颗粒作为常用助催化剂,可在半导体上形成活性位点,其中金属-半导体界面边缘的特殊活性位点在竞争机制中起关键作用。本研究制备了具有丰富界面边缘位点的Al掺杂SrTiO3负载贵金属催化剂,用于连续光热催化CO2和H2O转化。不同贵金属纳米颗粒上CO2对析氢性能的影响表现出显著差异。通过原位漫反射红外傅里叶变换光谱(DRIFTS)和密度泛函理论(DFT)计算研究了关键中间基团的相互作用,发现双齿碳酸盐(b-CO32−)倾向于占据金属-半导体界面边缘位点,竞争性消耗*H吸附位点并改变析氢能垒。通过建立简化几何模型量化颗粒尺寸、活性位点比例与CO2引起的产氢变化之间的关系,验证了b-CO32−的位点阻塞效应在Rh负载催化剂上占主导地位。通过调控Rh纳米颗粒尺寸可优化边缘位点比例,从而实现*H覆盖度与CO2活化之间的平衡,促进CO2RR生成甲烷。本研究通过边缘活性位点调控初步揭示了HER与CO2RR的界面竞争机制,为催化剂的合理设计提供新见解,并为提升CO2转化效率提供潜在策略。

关键词: 光热催化, 析氢, 二氧化碳还原, 活性位点, 界面竞争

Abstract:

Solar-driven photothermal catalytic CO2 conversion with H2O is a promising approach to produce sustainable fuels and chemicals. However, the competition between hydrogen evolution reaction (HER) and CO2 reduction reaction (CO2RR) results in unsatisfactory product selectivity. Noble metal nanoparticles (NMNPs) are widely used cocatalysts to introduce active sites on semiconductors, with unique active sites at the metal-semiconductor interfacial edges playing a critical role in the competitive mechanisms. Herein, we prepared a series of NMNPs loaded on Al-doped SrTiO3 with abundant interfacial edge sites for continuous photothermal catalytic CO2 and H2O conversion. Different NMNPs demonstrated distinct CO2-induced effects on hydrogen evolution. The key intermediate interactions were investigated by in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations. The results revealed that bidentate carbonate (b-CO32−) tended to occupy the edge sites at the metal-semiconductor interfaces, competitively consuming the active sites for *H adsorption and altering the energy barrier of hydrogen evolution. The predominant site-blocking effect of b-CO32− on Rh-loaded catalysts was verified through establishing a simplified geometric model to quantify the correlation of particle sizes, active site proportions and CO2-induced hydrogen production variations. Controlling Rh nanoparticle size can tune the proportion of edge sites, which involves a trade-off between *H coverage and CO2 activation and promotes the CO2RR process toward methane production. This work initially unravels the interfacial competitive mechanism between HER and CO2RR via edge-active-site modulation, hoping to provide valuable insights for the rational catalyst design and offer potential strategies to enhance CO2 conversion efficiency.

Key words: Photothermal catalysis, Hydrogen evolution, CO2 reduction, Active site, Interfacial competition