The development of highly efficient and robust bifunctional electrocatalysts for oxygen reduction (ORR) and evolution reactions (OER) is the key issue for realizing high‐performance and long‐life rechargeable zinc–air batteries (ZABs). However, it is still a great challenge to integrate independent ORR and OER sites in a catalyst with high activity. Here, a carbon nanotube‐bridging strategy is proposed to synthesize such a bifunctional oxygen electrocatalyst enriched with highly active single‐atom Fe sites for the ORR and high‐performance nanosized NiCo hydroxides for the OER. Consequently, the developed catalyst shows a small overpotential difference of 0.686 V. When used as an oxygen electrode catalyst, the corresponding ZAB exhibits a large power density of 219.5 mW cm−2, a small charge–discharge voltage gap of 0.72 V at 10 mA cm−2, and outstanding discharge–charge durability without attenuation after more than 700 cycles. This work proposes a new idea to realize multifunctional catalysts and drives the practical application of ZABs.
Purpose
The purpose of this paper is to evaluate the impact of scientific data in order to assess the reliability of data to support data curation, to establish trust between researchers to support reuse of digital data and encourage researchers to share more data.
Design/methodology/approach
The authors compared the correlations between usage counts of associated data in Dryad and citation counts of articles in Web of Science in different subject areas in order to assess the possibility of using altmetric indicators to evaluate scientific data.
Findings
There are high positive correlations between usage counts of data and citation counts of associated articles. The citation counts of article’s shared data are higher than the average citation counts in most of the subject areas examined by the authors.
Practical implications
The paper suggests that usage counts of data could be potentially used to evaluate scholarly impact of scientific data, especially for those subject areas without special data repositories.
Originality/value
The study examines the possibility to use usage counts to evaluate the impact of scientific data in a generic repository Dryad by different subject categories.
The
upsurging interest in rechargeable Zn-air batteries (ZABs)
has recently spurred tremendous research effort on exploiting highly
efficient and stable bifunctional oxygen electrocatalysts. Herein,
we proposed a facile metal–organic framework-hydrolyzed method
to fabricate a three-dimensional N-doped carbon nanotube material
enriched with FeCo species (FeCo/N-CNT) showing a small potential
difference of 0.71 V for oxygen electrocatalytic reactions. When it
was used as the air electrode catalyst to assemble the ZAB, high maximum
power density (237.5 mW cm–2) and large specific
capacity (747.4 mAh g–1) were achieved. More importantly,
the corresponding ZABs exhibited high cycling durability with an insignificant
voltage gap after the 1300th constant current charge–discharge
cycling. Such outstanding rechargeable ZAB performance should originate
from FeCo nanoparticles and Fe/Co–N co-doping species integrated
into well-graphitized carbon nanotubes. This study offers a novel
method to prepare efficient and stable bifunctional oxygen electrocatalysts
for rechargeable ZABs.
We present a method to prepare a conductive paper hybrid based on the polymerization of bithiophene monomer directly from the solid state of 2,2′-bithiophene inside a sheet of standard letter paper using atmospheric plasma since both the monomers and some plasma species, such as radicals, can penetrate into the paper. Polymerization of a 2,2′-bithiophene in its solid form using plasma offers a simple and straightforward way to synthesize a conductive polymer. To understand the polymerization reaction in atmospheric plasma, the formation of polythiophene on substrates and the reaction mechanism were investigated with Fourier-transform infrared spectroscopy (FTIR) and ultraviolet−visible (UV−vis) spectroscopy. The kinetics of the polymerization reaction was investigated by using UV−vis, and the rate of polymerization was found to be the second-order reaction. The resulting polymer film exhibited a conductivity of 6.67 S/ cm when I 2 was doped in the film. The polymerization 3,3′-dibromo-2,2′-bithiophene to poly(3,3′-dibromo-2,2′-bithiophene) was also studied for comparison. The described process provides a universal yet effective method of preparing conductive polythiophene films and polythiophene inside a sheet of paper. Three devices based on the synthesized conductive paper were also presented in this work.
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