无电沉积硼化镍材料对水氧化的电催化性能

Oxygen Evolution Reaction Electrocatalytic Performance Analysis of Electroless Plated Ni-Bx

通过无电沉积/化学镀的方法分别制得石墨烯(Graphene)、镍网(Ni foam,NF)、钛网(Ti mesh,TM)、碳布(Carbon cloth,CC)负载的硼化镍材料.其中在石墨烯基底上生长的硼化镍层由规则的纳米颗粒构成,且均匀致密.对几种材料在碱性条件下(1.0 mol/L KOH电解质中)的水氧化电催化性能进行了研究,结果表明,石墨烯基底上生长的硼化镍材料(NiBx/graphene)具有最佳的水氧化电催化性能.电流密度达到10 mA/cm2时的过电位仅为277 mV,相应的Tafel斜率为57 mV/dec.对石墨烯负载的硼化镍材料进行烧结,测得过电位为330 mV,与未烧结的样品相比电催化活性下降.该方法所制的石墨烯负载的硼化镍材料兼具高电催化活性和稳定性,为低成本、高效率的水氧化非贵金属电催化剂的制备提供了新思路.

Transition metal borides are one of the most promising electrocatalysts in water splitting reaction for their high electrocatalytic performance and low cost.Through electroless plating method,nickel borides grown on graphene,nickel foam(NF),Ti mesh(TM)and carbon cloth(CC)were fabricated,in which gra⁃phene supported nickel borides exhibits homogeneous and dense nanoparticles structure.The oxygen evolution electrocatalytic performances of these materials are studied in alkaline solution(1.0 mol/L KOH).The results show that the nickel boride grown on graphene(NiBx/graphene)exhibits the best electrocatalytic performance for water oxidation.An overpotential of only 277 mV is needed to reach the current density of 10 mA/cm2,and the corresponding Tafel slope are 57 mV/dec.The annealed sample shows an overpotential of 330 mV,which means an activity decline compared to the unannealed one.The NiBx/graphene prepared by this facile method exhibits high electrocatalytic activity and stability,which provides new strategy for preparing high-perfor⁃mance and low-cost water oxidation electrocatalysts.