Thiomolybdate
[Mo3S13]2– nanoclusters anchored
on reduced graphene oxide-carbon nanotube
(rGO-CNTs) aerogels were used as a new catalyst for efficient electrocatalytic
hydrogen evolution. The elemental distribution of sulfur (S) corresponded
well to the Mo distribution, and both Mo and S elements distributed
evenly in the Mo3S13@rGO-CNTs aerogels. Results
indicated that [Mo3S13]2– nanoclusters
inherently exposed a high number of active edge sites, which greatly
improved the electrocatalytic hydrogen evolution. The new peak at
168.8 eV corresponded to the characteristic S–O binding in
the S 2p region of Mo3S13@rGO-CNTs, indicating
that the [Mo3S13]2– clusters
were bond onto the rGO-CNTs aerogels through S–O binding. The
strong support of rGO-CNTs aerogels suppressed the aggregation of
[Mo3S13]2– nanoclusters, exposing
more active surface and electrons diffusions on the surface of Mo3S13@rGO-CNTs aerogels. Mo3S13@rGO-CNTs aerogels laden with 20 mg of [Mo3S13]2– exhibited close hydrogen evolution reaction
(HER) performance as compared with that of [Mo3S13-120]@rGO-CNTs aerogels laden with 120 mg of [Mo3S13]2– nanoclusters. This indicated the extremely
high HER performance of [Mo3S13]2– even at low mass. As a result, Mo3S13@rGO-CNTs
aerogels enabled remarkable electrochemical performances showing a
low overpotential (0.179 V at 10 mA cm–2) with a
small Tafel slope, reduced transfer resistance, and excellent stability.
A magnetic biocomposite based bio-sorbent (corn straw) was prepared after in situ co-precipitation with Fe2+ and Fe3+ solutions and amine functionalization.
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