Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Micromorphology and Phase Composition Manipulation of Nanoporous Gold with High Methanol Electro-oxidation Catalytic Activity through Adding a Magnetic Field in the Dealloying Process

Micromorphology and Phase Composition Manipulation of Nanoporous Gold with High Methanol Electro-oxidation Catalytic Activity through Adding a Magnetic Field in the Dealloying Process
Jingyu Qin, Weimin Wang, Lai-Chang Zhang, Hui Xu, Kechang Shen, Xiaoguang Wang, Shuai Liu
By dealloying a rapidly solidified (RS) Al2Au alloy, nanoporous gold (np-Au) samples with a three-dimensional (3D) interpenetrating ligament-channel structure are fabricated in 0, 0.02, and 0.2 T magnetic fields. Adding magnetic field leads to intermediate AlAu phase formation, decreases the dealloying rate, and triggers the formation of fine nanocrystals and amorphous phase in the np-Au ligaments. The np-Au samples dealloyed in 0, 0.02, and 0.2 T for 24 h (DA0, DA1, and DA2) appear in maze-like, honeycomb-like, and soda cracker-like micromorphologies, respectively. The DA1 sample possesses the smallest lattice constant a0 and highest preferred orientation factor F(111) of the (111) face. The parameters like surface coverage of the redox species Γ*, charge-transfer rate constant ks, exchange current density j0, corrosion potential Ecorr, and charge transfer resistance Rct indicate that the methanol electro-oxidation activity of the three samples is in this order: DA1 > DA2 > DA0, which can be ascribed to crystallographic, thermodynamic, and defective reasons. This work supplies a new method to enhance the methanol catalytic activity of np-Au.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b10475

DOI: 10.1021/acs.jpcc.7b10475

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.