The large-scale application of efficient water-splitting greatly promote the development of hydrogen economy which benefit both in alleviating the energy crisis and reaching the goal of carbon neutral. To realize considerable hydrogen evolution, rational design of catalysts with controllable structure and surface composition become crucial. In this work, we proposed an enhanced active site originated from Mo-vacancies defect in Mo 2 C crystal which was fabricated by the evaporation of Zn content in well-designed one-dimensional ZnMoO 4 precursor. Density functional theory calculation and experimental results demonstrated that the formation of molybdenum vacancies in molybdenum carbide promoted the water adsorption and H 2 desorption effectively, resulting in an excellent HER reaction dynamics. Moreover, one-dimensional porous nanowires also ensured rapid mass transfer and contributed strong support for superexcellence HER performance. As expected, VÀ Mo 2 C-900@NF exhibited extremely low overpotential (η 10 = 43 mV) at the current density of 10 mA cm À 2 and rapid reaction kinetics (Tafel slope 77.89 mV dec À 1 ).

Designing bifunctional electrocatalytic sites with outstanding activity and durability in one component toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is quite essential for rechargeable Zn‐air batteries. Herein, a novel core‐shell composition of Co9S8/Co embedded multi‐channel carbon nanofiber was successfully developed as efficient electrocatalysts for ORR and OER by step pyrolysis. The precursor of polystyrene was degraded while polyacrylonitrile was cross‐linked to hexatomic ring during the pro‐oxidation process, therefore, endowing the longitudinal and parallel channels along the fibers’ skeleton in the subsequent carbothermal reduction steps, which affords the superhighway for competent mass transmission and outstanding electrochemical specific area. On the other hand, the potent synergistic effect from precision‐designed core–shell species of Co9S8/Co allows the composite multi‐channel carbon fiber excellent ORR/OER bifunctional catalytic activities, with a gap of 0.89 V between the half‐wave potential toward ORR and potential of OER at a current density of 10 mA/cm2. Additionally, the rechargeable Zn‐air batteries were capable of operating steadily over 500 discharging/charging cycles at a constant current density of 5 mA/cm2.

Green hydrogen, using sustainable energy to decompose water to produce hydrogen, is regarded as the ideal and effective connection to convert electricity into chemical energy. Herein, well designed Ni‐doped Mo2C nanorod electrodes self‐supported on three types of substrates (Ni foam, Cu foam and stainless steel wire mesh) with outstanding gas resistance and prominent corrosion resistance were assembled together to build up a wide pH applicable electrode for Hydrogen Evolution. In particular, Ni‐doped Mo2C nanorod arrays on stainless steel wire mesh donated as Ni−Mo2C@SSW exhibited remarkable electrocatalytic properties towards hydrogen evolution reaction with superior overpotentials both in 1 M KOH and 0.5 M H2SO4 (102 mV and 106 mV at the current density of 10 mA cm−2) and incomparable continuous durability. This work provides the possibility for the realization of low cost, high activity and ultra‐stable durability HER electrocatalysts in practical industrial application.