当前位置: X-MOL 学术Inorg. Chem. Front. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Single-atom implanted two-dimensional MOFs as efficient electrocatalysts for the oxygen evolution reaction
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2020-09-22 , DOI: 10.1039/d0qi00812e
Rui-Li Peng 1, 2, 3, 4, 5 , Jia-Luo Li 6, 7, 8, 9 , Xiao-Ning Wang 1, 2, 3, 4, 5 , Yu-Meng Zhao 1, 2, 3, 4, 5 , Bao Li 1, 2, 3, 4, 5 , Bao Yu Xia 1, 2, 3, 4, 5 , Hong-Cai Zhou 6, 7, 8, 9, 10
Affiliation  

The exploration of novel electrochemical energy conversion and storage devices has been extensively studied in recent decades for their specific advantages. Therefore, the design of highly efficient, stable, and noble-metal-free electrocatalysts for oxygen-related reactions (OER) is critical but challenging and is still worth improving. Herein, a facile and controllable synthesis strategy for bimetallic electrocatalysts for the OER from a two-dimensional iron-based metal–organic framework (HUST-8, HUST = Huazhong University of Science and Technology) precursor has been reported. The unoccupied porphyrin center has been disposed into the layer structure of HUST-8, which is very facile for the introduction of a second type of metal center via post-modification treatment. Guided by the synthesis strategy, Fe/Ni, Fe/Co, Fe/Zn, Fe/Mn and Fe/Fe species have been fabricated, and their electrocatalytic performance for the OER has been further characterized, among which the Fe/Ni type exhibits the best efficiency and conversion. For Fe/Ni species of HUST-8 (labeled as Ni@HUST-8), in 1 M KOH, the initial potential for OER activity performance is 170 mV (vs. RHE). At 10 mA cm−2, the corresponding overpotential is 240 mV and the Tafel slope is simulated as 60.8 mV dec−1. All of these experimental results of Ni@HUST-8 illustrate its better performance than commercial IrO2. Compared to the MOF parent and other bimetallic species, the higher electrocatalytic performance of Ni@HUST-8 should be ascribed to the special synergistic effect of Fe and Ni centers, which tends to greatly improve the reaction kinetics and charge transfer efficiency, while increasing the activity of the OER and achieving the best catalytic performances. The systematic investigation clearly manifests the important role of the synergistic effect of bimetallic centers in the OER and provides other insight into fabricating tailored electrocatalysts derived from MOF-based templates.

中文翻译:

单原子植入二维MOF作为氧释放反应的有效电催化剂

由于其特定的优势,近几十年来对新型电化学能量转换和存储装置的探索已得到了广泛的研究。因此,用于氧相关反应(OER)的高效,稳定且不含贵金属的电催化剂的设计至关重要但充满挑战,仍然值得改进。在本文中,已经报道了一种基于二维铁基金属-有机骨架(HUST-8,HUST =华中科技大学)的OER双金属电催化剂的简便可控合成策略。未占用的卟啉中心被布置成HUST-8,这是非常容易的用于引入第二类型的金属中心的的层结构通过修改后的处理。以合成策略为指导,制备了Fe / Ni,Fe / Co,Fe / Zn,Fe / Mn和Fe / Fe物质,并进一步表征了它们对OER的电催化性能,其中Fe / Ni型表现出最佳的效率和转化率。对于HUST-8的铁/镍物种(标记为Ni @ HUST-8),在1 M KOH中,OER活性表现的初始潜力为170 mV(相对于RHE)。在10 mA cm -2时,相应的过电势为240 mV,Tafel斜率模拟为60.8 mV dec -1。Ni @ HUST-8的所有这些实验结果表明,其性能优于商用IrO 2。与MOF母体和其他双金属物种相比,Ni @ HUST-8较高的电催化性能应归因于Fe和Ni中心的特殊协同作用,倾向于大大提高反应动力学和电荷转移效率,同时增加OER的活性并达到最佳催化性能。系统的研究清楚地表明了双金属中心在OER中的协同作用的重要作用,并为制造基于MOF模板的定制电催化剂提供了其他见解。
更新日期:2020-11-03
down
wechat
bug