穆斯堡尔谱研究组主要从事:
1)先进原位/非原位铁/锡穆斯堡尔谱技术开发及其在新型功能材料和深空探测中的应用研究;
2)高效稳定的环境能源新型催化剂开发研究;
3)全球最大在线穆斯堡尔谱数据库的开发和文献数据期刊出版,为全球穆斯堡尔社区提供信息和知识服务。
一.穆斯堡尔谱学 Mössbauer spectroscopy
穆斯堡尔谱学是通过观测原子核的无反冲共振吸收/散射现象而研究核外电子举动的科学。Mössbauer spectroscopy is to study the electron behaviors through observing nuclear recoilless resonant absorption/scattering phenomenon.
1.1 穆斯堡尔谱学的基本原理 Basic principle of Mössbauer spectroscopy
穆斯堡尔谱测量是选择性地观察由特定原子核转移而产生的共振吸收/散射,不受其它同位素的干扰。Measurements of a resonant absorption/scattering by nuclear transitions. It is specific to a given isotope and no interference from other isotopes.
1.2 57Fe穆斯堡尔谱的超精细结构 Hyperfine structure of 57Fe Mössbauer spectroscopy
同质异能移:核处电子密度的变化测量 Isomer shift:Change of the electron density
四极分裂:核处电场梯度大小的测量 Quadrupole splitting:Magnitude of the electric field gradient
磁分裂:核处有效电场大小的测量 Magnetic splitting:Magnitude of the effective magnetic field
1.3 穆斯堡尔谱的透射和反射观测模式 Two modes of Mössbauer observation
1.4 穆斯堡尔谱技术开发 Developed Mössbauer techniques
1.5 成果介绍:电化学原位穆斯堡尔谱学研究 Study case:In-situ/operando electrochemical Mössbauer spectroscopic studies
1.5.1 镍铁基水氧化催化剂的机理研究 Mechanism studies on NiFe (oxy)hydroxide in oxygen evolution reaction (OER)
J. Energy Chem. 2021, 57, 212-218
首次通过原位实验,在OER起始电位附近就观察到Fe4+的存在,并证实了OER的电流密度与原位产生的高价铁物种密切相关。
Fe4+ was firstly observed near the OER onset potential in an in-situ experiment and OER current density closely related to the high-valent iron species.
1.5.2 铁基单原子氧还原催化剂的机理研究 Mechanism studies on single-Fe-atom in oxygen reduction reaction (ORR)
Chem. 2020, 6, 3440–3454
揭示Fe单原子催化中心的电子态和配位结构在ORR反应中的动态循环,提出包含自旋交叉过程的反应机制。
Electronic and coordination structural information of single atom Fe-N-C catalyst of ORR was explored and a spin-crossover-involved mechanism was proposed.
二.稳定高效催化剂的开发 Stable & efficient catalysts
我们开发了金属载体强相互作用的调变、载体的晶相效应、共聚物共形貌新策略、拓扑转型、化学溶液法、光化学法、多元醇还原等各种手法,用于制备面向能源和环境实际应用的新型高效多相催化材料。
High efficient heterogeneous catalytic materials for energy and environmental applications have been developed by various unique methods, such as the tuning of strong metal support interaction (SMSI), effect of support crystal phase, topological transformation, chemical solution process, photochemical process, polyol reduction and so on.
2.1 新型金属载体强相互作用的研究和催化剂开发 Novel strong metal-support interaction (SMSI) study and catalyst development
2.2 载体的晶相效应和催化剂设计 Effect of support crystal phase
ACS Catal. 2015, 5, 3528-3539
2.3 共聚物共形貌合成新策略 Copolymer-co-morphology synthetic method
Nanoscale, 2016, 8, 2333-2342
三.在深空探测中的应用 Applications in deep space exploration
项目旨在利用穆斯堡尔谱数据中心矿物学数据库、德国微型穆斯堡尔谱技术及匈牙利科学院优质均相57Co穆斯堡尔谱放射源制作技术,开发面向中国深空探测的先进微型穆斯堡尔谱测量系统。
MMOS IIC project is in progress by utilizing the three valuable resources of 1) Mineralogical Database of Mössbauer Effect Data Center, DICP, 2) MIMOS II technique, Leibniz Universität Hannover, and 3) high quality 57Co radioactive source technique, WIGNER Research Centre for Physics.
我们的国际合作还包括申请月球带回样品的分析研究和实验室模拟月球资源的原位利用。
The collaboration also includes requesting Lunar sample return analysis (virtual laboratory) – Chang'e 5 & later and in situ resource utilization (ISRU, laboratory experiments).