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Hydrogen Evolution Reaction Boosted by Bridge Bonds between Electrocatalyst and Electrode


Interfacial interactions between nanostructured electrode materials and electrodes play an important part in performance enhancement of electrochemical energy devices. However, the mechanism of interfacial interactions, as well as its influence on device performance, still remains unclear and is rarely studied. In this work, CoS2 nanobelt catalyst assembled on Ti foil (CoS2 nanobelts/Ti) is prepared through in situ chemical conversions and chosen as an example to probe the interfacial interactions between CoS2 catalyst and Ti electrode, and the correlation between interfacial interaction and hydrogen evolution reaction (HER) performance. By a series of characterizations and analyses, we propose that interfacial bridge bonds (Ti-S-Co, Ti-O-Co) in a covalent form may exist in the CoS2 nanobelts/Ti as well as its precursor Co(OH)3 nanobelts growing on Ti foil, which is further supported by density functional theory (DFT) calculations. Moreover, as a binder-free electrocatalytic electrode, the CoS2 nanobelts/Ti shows boosted HER performance, including higher catalytic activity, lower overpotential and Tafel slope, compared to its counterpart transformed from solution-produced precursor. The HER performance enhancement is ascribed to the existence of interfacial bridge bonds that not only strengthen the electrode-catalyst mechanical integrity, but also serve as efficient charge transfer channels between electrode and catalyst, thus ensuring stable and fluent electron transfer for HER. Further DFT calculations reveal that the CoS2 nanobelts/Ti catalyst with interfacial covalent interactions can facilitate the adsorption of H+ ions/H2 molecules and desorption of H2 molecules for accelerated HER. This work provides a new insight into interfacial interactions between electrodes and electrode materials in electrochemical devices, and paves the way to the rational design and construction of high-performance electrochemical devices for practical energy applications.

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Publication details

The article was received on 03 Dec 2017, accepted on 10 Jan 2018 and first published on 11 Jan 2018

Article type: Paper
DOI: 10.1039/C7NR08999F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Hydrogen Evolution Reaction Boosted by Bridge Bonds between Electrocatalyst and Electrode

    G. Liu, Z. Wang, L. Zu, Y. Zhang, Y. Feng, S. Yang, Y. Jia, S. Wang, C. Zhang and J. Yang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR08999F

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