Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 13, Pages 10890-10897Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00296
Keywords
layered double hydroxide; transition metal chalcogenides; self-standing hydrogen evolution reaction; nickel
Funding
- National Natural Science Foundation of China [51572296, U1662113]
- Fundamental Research Fund for the Central Universities [15CX08005A, 17CX06029]
- Taishan Scholar Project
- Scientific Research and Technology Development Project of Petrochina Co., LTD [2016B-2004(GF)]
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Considerable works have been devoted on developing high-efficiency nonplatinum electrocatalysts for hydrogen evolution reaction (HER). Herein, 3D heteromorphic NiCo2S4/Ni3S2 nanosheets network has been constructed on Ni foam (denoted as NiCo2S4/Ni3S2/NF) serving as a self-standing electrocatalyst through directly thermal sulfurization of a single-source NiCo-layered double hydroxide precursor. The resultant NiCo2S4/Ni3S2/NF electrode exhibits outstanding electrocatalytic HER performance with an extremely low onset overpotential of 15 mV and long-term durability in alkaline solution. Such enhanced HER performance can be credited to (1) the massive exposed active sites provided by mixed transition metal chalcogenides (NiCo2S4 and Ni3S2), (2) the strong interfacial interaction at NiCo2S4/Ni3S2 heterojunction interfaces with the strengthened H binding, and (3) the porous highly conductive Ni foam substrate with accelerated electron transfer. This work opens up a new direction to fabricate effective and non-noble-metal electrodes for water splitting and hydrogen generation.
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