Multi-interface MoS 2 /Ni 3 S 4 /Mo 2 S 3 composite as an efficient electrocatalyst for hydrogen evolution reaction over a wide pH range.

The exploitation of cost-efficiently electrocatalysts for hydrogen evolution reaction (HER) over a wide pH range remains a challenge. Herein, we prepared a novel multi-interface MoS 2 /Ni 3 S 4 /Mo 2 S 3 composite on carbon cloth (CC) that acts as an efficient electrocatalyst over a wide pH range through a facile one-pot strategy, where (NH 4 ) 4 [NiH 6 Mo 6 O 24 ]·5H 2 O (abbreviated to NiMo 6 ) as a bimetallic precursor and Ni(NO 3 ) 2 ·6H 2 O as one of the raw materials and salt are used together with thiourea (TU) for converting them into the MoS 2 /Ni 3 S 4 /Mo 2 S 3 load on CC (abbreviated as MoS 2 /Ni 3 S 4 /Mo 2 S 3 /CC). MoS 2 /Ni 3 S 4 /Mo 2 S 3 /CC-24 h shows a distinguished electrocatalytic performance towards HER with long-term stability in acid and alkaline media. It presents low overpotentials of 38 mV and 51 mV in 0.5 M H 2 SO 4 and 1.0 M KOH at 10 mA cm -2 , respectively. This work can deliver a new idea to fabricate cost-efficient and long-term durability HER electrocatalysts over a broad pH range.