Direct Synthesis of Stable 1T‐MoS2 Doped with Ni Single Atoms for Water Splitting in Alkaline Media. Issue 16 (15th March 2022)

• Record Type: Journal Article
• Authors: Wang, Guowei; Zhang, Guikai; Ke, Xiaoxing; Chen, Xiangyu; Chen, Xu; Wang, Yueshuai; Huang, Guoyu; Dong, Juncai; Chu, Shengqi; Sui, Manling
• Is Part Of: Small. Volume 18:Issue 16(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-15
• Subjects: 1T‐MoS 2 -- bifunctional electrocatalysts -- doping -- hydrothermal synthesis -- overall water splitting; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202107238
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Metallic MoS2 (i.e., 1T‐MoS2 ) is considered as the most promising precious‐metal‐free electrocatalyst with outstanding hydrogen evolution reaction (HER) performance in acidic media comparable to Pt. However, sluggish kinematics of HER in alkaline media and its inability for the oxygen evolution reaction (OER), hamper its development as bifunctional catalysts. The instability of 1T‐MoS2 further impedes its applications for scaling up, calling an urgent need for simple synthesis to produce stable 1T‐MoS2 . In this work, the challenge of 1T‐MoS2 synthesis is first addressed using a direct one‐step hydrothermal method by adopting ascorbic acid. 1T‐MoS2 with flower‐like morphology is obtained, and transition metals (Ni, Co, Fe) are simultaneously doped into 1T‐MoS2 . Ni‐1T‐MoS2 achieves an enhanced bifunctional catalytic activity for both HER and OER in alkaline media, where the key role of Ni doping as single atom is proved to be essential for boosting HER/OER activity. Finally, a Ni‐1T‐MoS2 ||Ni‐1T‐MoS2 electrolyzer is fabricated, reaching a current density of 10 mA cm −2 at an applied cell voltage of only 1.54 V for overall water splitting. Abstract : A direct hydrothermal method by adopting ascorbic acid is proposed to synthesize stable 1T‐MoS2 nanosheets for the hydrogen evolution reaction (HER)/oxygen evolution reaction (OER) in alkaline media. Enhanced HER/OER performance is obtained by Ni single atoms integration. An Ni‐1T‐MoS2 ||Ni‐1T‐MoS2 electrolyzer is fabricated, reaching a current density of 10 mA cm –2 at an applied cell voltage of only 1.54 V for water splitting.