Zhangxin Chen, Fan Jing, Minghui Luo, Xiaohui Wu, Haichang Fu, Shengwei Xiao, Binbin Yu, Dan Chen, Xianqiang Xiong, Yanxian Jin
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引用次数: 0
摘要
催化剂的设计在很大程度上依赖于电子金属与支撑物之间的相互作用,但金属与支撑物之间的界面具有不可控的电子或配位环境,这使得催化剂的设计极具挑战性。在此,我们概述了一种很有前景的催化剂合理设计方法,它将杂原子作为钯纳米颗粒的锚,用于乙醇氧化反应(EOR)催化。二甲胺硼烷(DB)中掺杂的 B 原子和 N 原子占据了 Ti3C2 晶格的位置,从而锚定了支撑的钯纳米粒子。电子从支撑物转移到 B 原子,然后再转移到金属钯,形成一个稳定的电子中心。这样就能产生强烈的电子相互作用,并使 d 波段中心下移,从而使 Pd 进入主导金属态,并使 Pd 纳米粒子均匀地沉积在支撑物上。获得的 Pd/DB-Ti3C2 比同类催化剂具有更高的耐久性(保留率为 14.6%),2000 次循环后的保留率为 91.1%,在单一金属阳极催化剂中名列前茅。此外,原位拉曼和密度泛函理论计算证实,Pd/DB-Ti3C2 能够以较低的反应能量使乙醇脱氢。
Local coordination and electronic interactions of Pd/MXene via dual-atom codoping with superior durability for efficient electrocatalytic ethanol oxidation
Catalyst design relies heavily on electronic metal-support interactions, but the metal-support interface with an uncontrollable electronic or coordination environment makes it challenging. Herein, we outline a promising approach for the rational design of catalysts involving heteroatoms as anchors for Pd nanoparticles for ethanol oxidation reaction (EOR) catalysis. The doped B and N atoms from dimethylamine borane (DB) occupy the position of the Ti3C2 lattice to anchor the supported Pd nanoparticles. The electrons transfer from the support to B atoms, and then to the metal Pd to form a stable electronic center. A strong electronic interaction can be produced and the d-band center can be shifted down, driving Pd into the dominant metallic state and making Pd nanoparticles deposit uniformly on the support. As-obtained Pd/DB–Ti3C2 exhibits superior durability to its counterpart (∼14.6% retention) with 91.1% retention after 2000 cycles, placing it among the top single metal anodic catalysts. Further, in situ Raman and density functional theory computations confirm that Pd/DB–Ti3C2 is capable of dehydrogenating ethanol at low reaction energies.
期刊介绍:
Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.