Herein,
we first propose a facile strategy to synthesize Co9S8 and MoS2 nanocrystals embedded in
porous carbon nanoflake arrays supported on carbon nanofibers (Co9S8-MoS2/N-CNAs@CNFs) by the pyrolysis
of Mo-doped Zn, Co zeolitic imidazolate framework grown on carbon
nanofibers and subsequent sulfuration. The electrocatalyst shows high
and stable electrocatalytic performance, with a half-wave potential
of 0.82 V for oxygen reduction reaction and an overpotential at 10
mA cm–2 for oxygen evolution reaction (0.34 V) and
hydrogen evolution reaction (0.163 V), which outperform the metal–organic
framework-derived transition metal sulfide catalysts reported so far.
Furthermore, the Co9S8-MoS2@N-CNAs@CNFs
are employed as an air cathode in a liquid-state and all-solid-state
zinc-air battery, presenting high power densities of 222 and 96 mW
cm–2, respectively. Such excellent catalytic activities
are mainly owing to the unique three-dimensional structure and chemical
compositions, optimal electronic conductivity, adequate surface area,
and the abundance of active sites. Thus, this work provides an important
method for designing other metal–organic framework-derived
three-dimensional structural sulfide quantum dot multifunctional electrocatalysts
for wider application in highly efficient catalysis and energy storage.
Alkali metal nitrate-/nitrite-promoted MgO sorbents are promising candidates for intermediate-temperature (200-500 °C) CO 2 capture. However, the structure-performance relationship and kinetic characteristics of NaNO 2-promoted MgO remain unclear. Here the effects of physical-chemical properties on the CO 2 sorption performance of NaNO 2-promoted MgO and the sorption kinetics were comprehensively studied to elucidate the detailed role of NaNO 2. Samples were characterized by X-ray diffraction, scanning electron microscopy, N 2 adsorption, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The sorption kinetics were obtained by isothermal thermogravimetry and elucidated using a double exponential model. Compared with pure MgO and NaNO 3-promoted MgO, NaNO 2-modified MgO had a lower initial sorption temperature and a unique bimodal sorption characteristic. Characterizations results revealed that such bimodal sorption
Flexible, wearable self-powered pressure sensors have successfully sparked great interest in a variety of potential applications. However, the fabrication of such a sensor system with ultra-long battery life, ultra-high operational...
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