Ni Weiyan, Wang Teng, Schouwink Pascal Alexander, Chuang Yu-Chun, Chen Hao Ming, Hu Xile
Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), BCH 3305, 1015, Lausanne, Switzerland.
Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Angew Chem Int Ed Engl. 2020 Jun 26;59(27):10797-10801. doi: 10.1002/anie.201916314. Epub 2020 Apr 28.
The hydroxide-exchange membrane fuel cell (HEMFC) is a promising energy conversion device. However, the development of HEMFC is hampered by the lack of platinum-group-metal-free (PGM-free) electrocatalysts for the hydrogen oxidation reaction (HOR). Now, a Ni catalyst is reported that exhibits the highest mass activity in HOR for a PGM-free catalyst as well as excellent activity in the hydrogen evolution reaction (HER). This catalyst, Ni-H -2 %, was optimized through pyrolysis of a Ni-containing metal-organic framework precursor under a mixed N /H atmosphere, which yielded carbon-supported Ni nanoparticles with different levels of strains. The Ni-H -2 % catalyst has an optimal level of strain, which leads to an optimal hydrogen binding energy and a high number of active sites.
氢氧化物交换膜燃料电池（HEMFC）是一种很有前景的能量转换装置。然而，由于缺乏用于氢氧化反应（HOR）的无铂族金属（PGM-free）电催化剂，HEMFC的发展受到了阻碍。现在，有报道称一种镍催化剂在无PGM催化剂的HOR中表现出最高的质量活性，并且在析氢反应（HER）中也具有优异的活性。这种催化剂，即Ni-H -2%，是通过在混合N₂/H₂气氛下对含镍金属有机框架前驱体进行热解而优化得到的，这产生了具有不同应变水平的碳载镍纳米颗粒。Ni-H -2%催化剂具有最佳的应变水平，这导致了最佳的氢结合能和大量的活性位点。
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