TY  - JOUR
AU  - Liang, Tingting
AU  - Lenus, Syama
AU  - Liu, Yaoda
AU  - Chen, Ya
AU  - Sakthivel, Thangavel
AU  - Chen, Fuyi
AU  - Ma, Fei
AU  - Dai, Zhengfei
PY  - 2023
TI  - Interface and M3+/M2+ Valence Dual-Engineering on Nickel Cobalt Sulfoselenide/Black Phosphorus Heterostructure for Efficient Water Splitting Electrocatalysis
JO  - Energy & Environmental Materials
SN  - 2575-0348
VL  - 6
IS  - 2
AB  - The catalyst innovation that aims at noble-metal-free substitutes is one key aspect for future sustainable hydrogen energy deployment. In this paper, a nickel cobalt sulfoselenide/black phosphorus heterostructure (NiCoSe|S/BP) was fabricated to realize the highly active and durable water electrolysis through interface and valence dual-engineering. The NiCoSe|S/BP nanostructure was constructed by in-situ growing NiCo hydroxide nanosheet arrays on few-layer BP and subsequently one-step sulfoselenization by SeS2. Besides the conductive merit of BP substrate, holes in p-type BP are capable of oxidizing the Co2+ to high-valence and electron-accepting Co3+, benefiting the oxygen evolution reaction (OER). Meanwhile, Ni3+/Ni2+ ratio in the heterostructure is reduced to maintain the electrical neutrality, which corresponds to the increased electron-donating character for boosting hydrogen evolution reaction (HER). As for HER and OER, the heterostructured NiCoSe|S/BP electrocatalyst exhibits small overpotentials of 172 and 285 mV at 10 mA cm−2 (η10) in alkaline media, respectively. And overall water splitting has been achieved at a low cell potential of 1.67 V at η10 with high stability. Molecular sensing and density functional theory (DFT) calculations are further proposed for understanding the rate-determine steps and enhanced catalytic mechanism. The investigation presents a deep-seated perception for the electrocatalytic performance enhancement of BP-based heterostructure.
UR  - https://doi.org/10.1002/eem2.12332
DO  - 10.1002/eem2.12332