Controlled synthesis of ultrasmall RuP_(2) particles on N,P-codoped carbon as superior pH-wide electrocatalyst for hydrogen evolution

Electrocatalytic hydrogen evolution reaction(HER)is a highly potential strategy to massively produce green hydrogen fuels.However,the employment of costly Pt-based electrocatalyst in the cathode of electrolyzer greatly hampers the development of hydrogen economy.Ruthenium phosphide catalysts have recently drawn wide attention due to the Pt-like activity but relatively lower cost.Herein,a facile strategy was proposed for the controlled preparation of the ultrasmall RuP_(2) nanoparticles on N,P-codoped carbon from common precursors of Ru(Ⅱ)complex and phytic acid.By taking advantage of simple mixing and pyrolysis,the as-synthesized RuP_(2) nanoparticles were uniformly embedded onto the N,P-codoped carbon nanosheet.The composite catalyst shows better activity than Pt/C for alkaline HER and comparable activity for acidic and neutral HER.The superior activity can be ascribed to the ultrasmall-size and efficient RuP_(2) together with good mass and charge transfer ability assured by N,P-codoped carbon support.The advantages including low-cost and simple synthesis in this work present an encouraging substitute to replace commercial Pt/C for hydrogen-related practical applications.

Constructing core@shell structured photothermal nanosphere with thin carbon layer confined Co-Mn bimetals for pollutant degradation and solar interfacial water evaporation

Photothermal material applied in environmental governance has attracted growing attention.By combining the Stober method and dopamine-triggered coating strategy,Co-Mn precursor was in situ incorporated into the poly dopamine(PDA)layer over the surface of silica cores.Afterwards,a unique photothermal nanosphere with SiO_(2)core and thin carbon layer and dual Co-Mn oxides shell was allowed to form by sequential heat treatment in the inert atmosphere(SiO_(2)@CoMn/C).The bimetallic fraction of Co/Mn in the carbon layer and post-treatment calcination temperature was comprehensively tuned to optimize the peroxymonosulfate(PMS)activation performance of the catalyst.The state of bimetallic species was studied including their physical distribution,chemical valence,and interplay by various characterizations.Impressively,Co oxides appear as dominant monodispersed nanoparticles(~10 nm),while Mn with cluster-like morphology is observed to uniformly distribute over thin-layer carbon and adhered to the surface of SiO_(2)nanospheres(~250 nm).The calcined temperature could tune the oxidized state of Co species,leading to the optimization of the catalytic performance of introduced dual metal species.As a result,this obtained optimal catalyst integrated the advantages of exposed bimetallic CoMn species and N-doped thin carbon to deliver excellent catalytic PMS activation performance and photothermal synergetic catalytic mineralization ability for diversiform pollutants.Further reactions condition controls and anion interference studies were conducted to identify the adaptability of the optimal catalyst.Moreover,the application of solar-driven interfacial water evaporation using optimal SiO_(2)@Co_3Mn_1/C-600 catalyst was explored,showing a high water evaporation rate of 1.48 kg·m^(-2)·h^(-1)and an efficiency of 95.2%,further revealing a comprehensive governance functionality of obtained material in the complex pollution condition.