Thiomolybdate [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> Nanoclusters Anchored on Reduced Graphene Oxide-Carbon Nanotube Aerogels for Efficient Electrocatalytic Hydrogen Evolution

Published on 2017-09-13T13:50:45Z (GMT) by
Thiomolybdate [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> 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 Mo<sub>3</sub>S<sub>13</sub>@rGO-CNTs aerogels. Results indicated that [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> 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 Mo<sub>3</sub>S<sub>13</sub>@rGO-CNTs, indicating that the [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> clusters were bond onto the rGO-CNTs aerogels through S–O binding. The strong support of rGO-CNTs aerogels suppressed the aggregation of [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> nanoclusters, exposing more active surface and electrons diffusions on the surface of Mo<sub>3</sub>S<sub>13</sub>@rGO-CNTs aerogels. Mo<sub>3</sub>S<sub>13</sub>@rGO-CNTs aerogels laden with 20 mg of [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> exhibited close hydrogen evolution reaction (HER) performance as compared with that of [Mo<sub>3</sub>S<sub>13</sub>-120]@rGO-CNTs aerogels laden with 120 mg of [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> nanoclusters. This indicated the extremely high HER performance of [Mo<sub>3</sub>S<sub>13</sub>]<sup>2–</sup> even at low mass. As a result, Mo<sub>3</sub>S<sub>13</sub>@rGO-CNTs aerogels enabled remarkable electrochemical performances showing a low overpotential (0.179 V at 10 mA cm<sup>–2</sup>) with a small Tafel slope, reduced transfer resistance, and excellent stability.

Cite this collection

Shang, Yanan; Xu, Xing; Gao, Baoyu; Ren, Zhongfei (2017): Thiomolybdate [Mo3S13]2– Nanoclusters Anchored on Reduced Graphene Oxide-Carbon Nanotube

Aerogels for Efficient Electrocatalytic Hydrogen Evolution. ACS Publications.

https://doi.org/10.1021/acssuschemeng.7b01713

Retrieved: 15:24, Nov 21, 2017 (GMT)