| The worldwide energy shortage,worsening climate and environment problems have increasingly become the focus of attention.Looking for clean and renewable energy,changing the existing energy structure is the key to solve the energy problem.Among them,hydrogen is considered as one of the most potential energy sources to replace fossil fuels because of its high energy density,no carbon emission and highly renewable.Although the noble metal catalysts represented by Pt have excellent performance in hydrogen production from water splitting,the high cost and scarce reserves greatly limit their industrialization process.In recent years,transition metal carbides have been widely studied because of their high melting point,high mechanical strength and excellent catalytic performance.In this article,we synthesize MoxC and rod-like nanostructured Co-MOF@WxC by reactive magnetron sputtering and study their hydrogen evolution performance of water splitting.The main contents are as follows:(1)MoxC electrode was directly prepared by co-sputtering of molybdenum target and carbon target,and the performance of MoxC electrode was optimized by adjusting the experimental parameters.We found that the MoxC electrode has the best hydrogen evolution performance when the sputtering power of Mo target is 75 W,the sputtering power of carbon target is 200W and the deposition pressure is 0.5 Pa.In 1M KOH solution,the overpotential of MoxC is 121 mV and the Tafel slope is 70.6 mV dec-1 at the current density of 10 mA cm-2.At the same time,MoxC electrode shows good stability in the stability test.(2)By combining chemical and physical methods,rod-shaped Co-MOF was grown on carbon paper by solution method,and then a layer of WxC thin film was deposited on Co-MOF by co-sputtering with tungsten target and carbon target.By adjusting the deposition time,we determined the beat reaction conditions of synthesizing Co-MOF@WxC.Benefit from the high surface area of rod like nanostructures,the hydrogen evolution performance of Co-MOF@WXC has been greatly improved.The overpotential of Co-MOF@WXC is only 84 mV and the Tafel slope is 82.6 mV dec-1.Meanwhile,the performance of Co-MOF@WxC have no significant change after a long term test,showing good stability. |
