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CoP nanoparticles confined in PBA-derived nanocubes supported on MXene for efficient electrocatalytic water splitting. [Display omitted] • Simply synthesis method: Simple coprecipitation-phosphatization two steps to synthesis the heterojunction between CoP and Ti 3 C 2 T x MXene (CoP/Ti 3 C 2 T x). • Outstanding electrochemical performance: The catalyst CoP/Ti 3 C 2 T x exhibits impressive overpotentials of 103 mV and 312 mV for HER and OER, respectively, to afford 10 mA cm−2 in 1.0 M KOH and maintain for 24 h. • Thorough theoretical calculation verification: The DFT calculations reveal that the introduction of Ti 3 C 2 T x MXene can significantly enhance the electrochemical performance towards water splitting. The exploration of bifunctional catalyst with economic, durable, and efficient performance plays a crucial role to boost both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in overall water splitting. Herein, we report a feasible strategy to design effective heterostructure between CoP and Ti 3 C 2 T x MXene (denoted as CoP/Ti 3 C 2 T x). This approach allows for the growth of CoP nanoparticles with uniform size of 5 nm on the Ti 3 C 2 T x MXene, further enhancing the water electrolysis efficiency. The CoP/Ti 3 C 2 T x bifunctional catalyst demonstrates an exceptional HER activity with a satisfactory overpotential of 103 mV at 10 mA cm−2, and also can drive 10 mA cm−2 for OER with the overpotential of 312 mV in 1.0 M KOH. Moreover, the CoP/Ti 3 C 2 T x -based electrolyzer exhibits high electrochemical stability for 24 h with a low required voltage of 1.66 V at 10 mA cm−2. The density functional theory (DFT) calculations reveal that the introduction of Ti 3 C 2 T x MXene significantly adjusts d-band center towards Fermi level and expand total density of states, resulting in great electrical conductivity, enhanced water adsorption, and activation. This study provides an available mode for effective design and construction of non-noble-metal-based dual-functional catalyst toward practical energy conversion. [ABSTRACT FROM AUTHOR]

A virus-like hybrid material constituted by CoP nanoparticles confined in porous N-doped carbon framework decorated with N-doped carbon nanotubes for efficient water splitting. [Display omitted] Exploration of catalysts for water splitting is critical for advancing the development of energy conversion field, but designing bifunctional catalysts remains a major challenge. Herein, we demonstrate the N-doped carbon nanotube (NCNT)-grafted N-doped carbon (NC) framework embedding CoP nanoparticles (CoP@NC/NCNT) as hydrogen and oxygen evolution reaction (HER and OER) catalysts for water splitting. As a result, the CoP@NC/NCNT electrode requires the overpotentials of 106 and 177 mV at 10 mA cm−2 in 0.5 M H 2 SO 4 and 1.0 M KOH solutions for HER, respectively. Moreover, an overpotential of 324 mV for OER can drive 10 mA cm−2 in 1.0 KOH. The CoP@NC/NCNT-based electrolyzer derives a current density of 10 mA cm−2 at a low voltage of 1.72 V in 1.0 M KOH and remains stable for 10 h. The outstanding electrocatalytic performance is mainly attributed to the hierarchical structure with rich branches and highly active component of CoP. The intimate contacts between hierarchical porous NC frameworks by cross-linked NCNTs create a 3D conductive network, which facilitates electron or mass transfer and activates CoP. This work offers a novel route for preparing hierarchical carbon framework encapsulated metal phosphide particles for potential applications in energy conversion field. [ABSTRACT FROM AUTHOR]

[Display omitted] Effective removal of antibiotics in the environment can be a demanding issue concerning the ecosystem and human health. Photocatalysis and peroxymonosulfate (PMS) oxidation have become important methods to effectively remove stubborn pollutants. In this work, by integrating these two technologies, an efficient system for degrading chloramphenicol (CAP) in water was proposed. The system was constructed by coupling strontium-doped lanthanum cobaltate (LSCO5) with chlorine-doped carbon nitride (CGCN). By doping, the increase of oxygen vacancy and the adjustment of bandgap were realized. Photoluminescence and electrochemical impedance experiments showed that the heterojunction can promote electron transfer and photogenerated carrier separation. Under the synergistic effect of PMS oxidation and photocatalysis, the prepared composite with an optimal loading of 40% LSCO5 can degrade 95.6% of CAP within 20 min. Degradation experiments on different pollutants proved the versatility of the catalytic system. The enhanced degradation mechanism of CAP was explored based on the assessment of the degradation efficiency of CAP, electron paramagnetic resonance (EPR), and quenching experiments. Through liquid chromatography-mass spectrometry (LC-MS) analysis, a possible route for CAP degradation was also proposed. This research provides some inspiration for the remediation of polluted water with perovskite-based catalyst under the synergistic effect of PMS and photocatalysis. [ABSTRACT FROM AUTHOR]