In‐Situ Growth of Cu₂S‐MoS₂ Bimetallic Electrocatalyst on Carbon Cloth for Hydrogen Evolution Reaction

Abstract

Hydrogen evolution reaction (HER) is one of prospective methods to produce hydrogen energy, and the key technology of which lies in the preparation of electrocatalysts. Preparations of catalysts with high efficiency, low price and good stability are expected. In this work, a new polyoxometalate‐based copper‐organic framework, [{CuII(C10N6H7)4(H2O)2}H6(PMo12O40)2] ⋅ 12H2O (1) [C10N6H7: 3‐(1H‐pyrazol‐4‐yl)‐5‐(pyridin‐4‐yl)‐1,2,4‐triazole], was synthesized as an electrocatalyst precursor, and confirmed by infrared spectroscopy (IR), single‐crystal X‐ray diffraction (SXRD) and X‐ray powder diffraction (PXRD). A new electrocatalyst (Cu2S‐MoS2@CC‐1) was synthesized from 1, thiourea (TU) and carbon cloth (CC) by a one‐pot hydrothermal method. Due to the synergistic effects between Cu2S and MoS2, the Cu2S‐MoS2@CC‐1 catalyst exhibits high electrocatalytic HER activity and good stability in 0.5 M H2SO4. Namely, Cu2S‐MoS2@CC‐1 shows low overpotential of 150 mV@10 mA cm−2 vs reversible hydrogen electrode (RHE) and small Tafel slope of 61 mV dec−1, and remains good stability at least 94 h and over 1000 catalytic cycles. This method provides a promising strategy for development of non‐noble metal catalysts.

Recent research progress on polyoxometalate-based electrocatalysts in energy generation

“…Then, they utilized the hydrothermal method with TU and CC to fabricate the Cu 2 S-MoS 2 @CC-1 nanocomposite. 128 In 0.5 M H 2 SO 4 , Cu 2 S-MoS 2 @CC-1 exhibited remarkable HER activity, which could be attributed to the synergistic effect between Cu 2 S and MoS 2 . Notably, Cu 2 S-MoS 2 @CC-1 achieved a low overpotential of 150 mV at j = 10 mA cm −2 , accompanied by a Tafel slope of 61 mV dec −1 .…”