Developing
advanced hydrogen evolution reaction (HER) electrocatalysts
is of great significance. Herein, we report porous rodlike cobalt–nickel
bimetal nitrides (Co
x
Ni
y
N) as high-efficiency HER electrocatalysts in a wide pH range
through nitridation from a bimetal–organic framework (MOF-74)
precursor. Thanks to collaborative superiorities of high surface areas,
abundant mesoporous structure, perfect metal element dispersion, and
electron modulation effect, the as-prepared Co
x
Ni
y
N possess a superior catalytic
ability toward HER at all pH values. In particular, the optimal Co2Ni1N requires overpotentials of 102.6 and 92.0
mV to afford a current density of 10 mA cm–2 in
alkaline and acidic solution, respectively. In addition, it also presents
favorable activity in neutral media and excellent stability under
different pH conditions. The present study not only offers a strategy
for the design and synthesis of porous bimetal nitrides derived from
binuclear MOF but also brings up new avenues for the development of
cost-effective and competent all-pH HER catalysts for renewable energy
systems.
Form‐stable phase change materials (PCMs) have great potential to regulate the unbalanced heat demand and supply, yet most of the PCMs are in powder, plate, or bulk rigid forms, difficult to adhere to the heat source or target substrates. Herein, PCMs coatings based on reactive poly(ethylene glycol) (RPEG) are developed for direct thermal energy exchange and storage. RPEG with highly reactive silanol groups is obtained by reaction of PEG with 3‐isocyanatopropyltriethoxysilane (IPTS), followed by hydrolyzation in weak acid. Cross‐linked PCMs coatings are obtained on various substrates, including cotton fabric, wood, tinplate, and even irregular objects. The coatings show obvious solid‐solid phase transition properties and high energy storage densities (142.8 J g−1). Multi‐walled carbon nanotubes (MWCNTs) are further doped into the coatings aided by a self‐cross‐linkable dispersant. The composite coatings exhibit excellent high‐temperature form stability and rapid thermal exchange properties owing to the formation of the cross‐linked network between RPEG and MWCNTs. Thermal regulation clothes are prepared by a spray coating method, which show no performance deterioration after washing three times, indicating good washing durability.
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