Tingting Liu

Abstract A surfactant‐stabilized coordination strategy is used to make two‐dimensional (2D) single‐atom catalysts (SACs) with an ultrahigh Pt loading of 12.0 wt %, by assembly of pre‐formed single Pt atom coordinated porphyrin precursors into free‐standing metal–organic framework (MOF) nanosheets with an ultrathin thickness of 2.4±0.9 nm. This is the first example of 2D MOF‐based SACs. Remarkably, the 2D SACs exhibit a record‐high photocatalytic H 2 evolution rate of 11 320 μmol g −1 h −1 via water splitting under visible light irradiation ( λ >420 nm) compared with those of reported MOF‐based photocatalysts. Moreover, the MOF nanosheets can be readily drop‐casted onto solid substrates, forming thin films while still retaining their photocatalytic activity, which is highly desirable for practical solar H 2 production.

In this communication, we report that a Co-doped NiSe2 nanoparticles film electrodeposited on a conductive Ti plate (Co0.13Ni0.87Se2/Ti) behaves as a robust electrocatalyst for both HER and OER in strongly basic media, with good activity over a NiSe2/Ti counterpart. This Co0.13Ni0.87Se2/Ti catalytic electrode delivers 10 mA cm(-2) at an overpotential of 64 mV for HER and 100 mA cm(-2) at an overpotential of 320 mV for OER in 1.0 M KOH. A voltage of only 1.62 V is required to drive 10 mA cm(-2) for the two-electrode alkaline water electrolyzer using Co0.13Ni0.87Se2/Ti as an anode and cathode.

Abstract It is highly attractive, but still remains a huge challenge, to develop efficient non‐noble‐metal electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under neutral and alkaline conditions. In this paper, we report that CoP nanosheet arrays on carbon cloth (CoP NA/CC), derived from α‐Co(OH) 2 NA/CC, behaves as a three‐dimensional bifunctional water‐splitting catalyst electrode with high activity and durability in neutral and alkaline media. Such CoP NA/CC demands overpotentials of 145 and 52 mV to afford 10 mA cm −2 for the HER in 1.0 M phosphate buffer solution (PBS) and 1.0 M KOH, respectively, with much superior activity to α‐Co(OH) 2 NA/CC. It can be attributed to the more thermo‐neutral hydrogen adsorption free energy for CoP than α‐Co(OH) 2 , according to density functional theory calculations. This electrode also demonstrates superior OER activity over α‐Co(OH) 2 NA/CC and needs overpotentials of only 536 and 300 mV to drive 10 mA cm −2 at neutral and alkaline pH, respectively. The two‐electrode water electrolyzer using CoP NA/CC as both the cathode and anode shows a 2 mA cm −2 water‐splitting current at a cell voltage of 1.60 V in 1.0 M PBS and needs 1.65 V for 10 mA cm −2 under alkaline condition with excellent stability.

An amorphous CoSe film electrodeposited on a Ti mesh (a-CoSe/Ti) acts as an efficient water-splitting catalyst in strongly basic media, with the need for overpotentials of 292 and 121 mV to drive 10 mA cm⁻² for OER and HER, respectively.

Comparative study of the photocatalytic performance for the degradation of different by ZnIn₂S₄ based on the adsorption of dyes, the active species and the degradation pathway.