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

Nanostructured Nickel Cobaltite Antispinel as Bifunctional Electrocatalyst for Overall Water Splitting

Nanostructured Nickel Cobaltite Antispinel as Bifunctional Electrocatalyst for Overall Water Splitting
Man Li, Xiaowei Lv, Xingxing Jiang, Yibing Li, Qingwei Li, Chuan Zhao, Yan Shen, Mingkui Wang, Guoying Gao, Shasha Zhang, Zhixin Zhao, Leiming Tao, Xin Xiao
One major goal in the field of catalysis is to develop efficient, low-cost, and stable catalysts to replace noble-metal-based materials. Herein, we for the first time present the nickel cobaltite (NiCo2O4) of nanosheets morphology (NCO-NSs) and nanowires morphology (NCO-NWs) as an efficient electrocatalyst for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution, affording a current density of 10 mA cm–2 at low overpotential of 170 mV for the HER and 230 mV for the OER, respectively. With the aid of DFT calculation, we have evaluated their special catalytic activities by focusing on the position of d-band centers and adsorption energy of intermediates (H2*, H*, H2O*, OH*, O*, OOH*, and O2*) on catalyst surface. The result reveals that the rate-determining-step for HER and OER is H* and O* adsorption, respectively, with the NiTd3+ (Ni3+ occupied at the tetrahedral site) being the active site for water splitting. A highly efficient two-electrode electrolyzer based on NCO-NSs∥NCO-NWs configuration is designed and tested for long-term stability evolution. Furthermore, a NCO-NSs∥NCO-NWs-based alkaline electrolyzer can be approach 15 mA cm–2 at 1.65 V, superior to that of Pt∥IrO2 couple, along with strong stability.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b08814

DOI: 10.1021/acs.jpcc.7b08814

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.