Ultrafine Pt Nanoparticle‐Decorated Pyrite‐Type CoS₂Nanosheet Arrays Coated on Carbon Cloth as a Bifunctional Electrode for Overall Water Splitting

Abstract

To improve the utilization efficiency of precious metals, metal‐supported materials provide a direction for fabricating highly active and stable heterogeneous catalysts. Herein, carbon cloth (CC)‐supported Earth‐abundant CoS2 nanosheet arrays (CoS2/CC) are presented as ideal substrates for ultrafine Pt deposition (Pt‐CoS2/CC) to achieve remarkable performance toward the hydrogen and oxygen evolution reactions (HER/OER) in alkaline solutions. Notably, the Pt‐CoS2/CC hybrid delivers an overpotential of 24 mV at 10 mA cm−2 and a mass activity of 3.89 A Ptmg−1, which is 4.7 times higher than that of commercial Pt/C, at an overpotential of 130 mV for catalyzing the HER. An alkali‐electrolyzer using Pt‐CoS2/CC as a bifunctional electrode enables a water‐splitting current density of 10 mA cm−2 at a low voltage of 1.55 V and can sustain for more than 20 h, which is superior to that of the state‐of‐the‐art Pt/C+RuO2 catalyst. Further experimental and theoretical simulation studies demonstrate that strong electronic interaction between Pt and CoS2 synergistically optimize hydrogen adsorption/desorption behaviors and facilitate the in situ generation of OER active species, enhancing the overall water‐splitting performance. This work highlights the regulation of interfacial and electronic synergy in pursuit of highly efficient and durable supported catalysts for hydrogen and oxygen electrocatalytic applications.

Nickel@Nitrogen‐Doped Carbon@MoS2 Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

“…An effective catalyst is needed to drive the hydrogen evolution reaction (HER) during water splitting. Pt and Pt‐based materials are of high catalytic activity for HER . However, the scarcity and high cost hinder their large‐scale use .…”

“…Pt and Pt‐based materials are of high catalytic activity for HER . However, the scarcity and high cost hinder their large‐scale use . Therefore, many efforts have been devoted to design and fabricate nonprecious metal electrocatalysts for HER.…”

NiS‐Decorated ZnO/ZnS Nanorod Heterostructures for Enhanced Photocatalytic Hydrogen Production: Insight into the Role of NiS

“…Nevertheless, as shown in Figure c,d, charge redistribution mainly occurred between NiS and ZnS or NiS and ZnO in the NiS/ZnS and NiS/ZnO hybrid system, whereas almost no charge was observed at the NiS/ZnS or NiS/ZnO interface region. That is to say, in the NiS/ZnOS– x system, NiS was mainly used as a cocatalyst to transfer the electrons rather than a p‐type semiconductor to form a p–n heterojunction . In addition, to calculate the sum atomic charges of ZnO, ZnS, and NiS, Mulliken population analyses of NiS/ZnS and NiS/ZnO complexes were executed, and the calculation results are shown in Table (the details of the each atomic charge are shown in Table S2 and S3, Supporting Information).…”

Advances in the development of power supplies for the Internet of Everything

“…The complicated replacement of batteries is challenging due to the large number of batteries (millions and billions) in the IoE system . Usually, the lifetime of batteries is determined by the temperature, state‐of‐charge, magnitude of load currents, self‐discharge, and so on, which is mainly affected by the electrode and electrolyte materials as well as the interfacial matching between them . The service life of some typical commercial batteries is shown in Table .…”