原始溶液中Ni、Co质量比对Ni-Co-S-O/NF催化剂在碱性水电解中析氧性能的影响

Effect of Mass Ratio of Ni and Co in Initial Solution on Oxygen Evolution Reaction Performance of Ni-Co-S-O/NF Catalyst in Alkaline Water Electrolysis

本文中主要研究了原始溶液中Ni、Co质量比(w_(Ni)∶w_(Co))对Ni-Co-S-O复合材料催化剂结构及性能的影响。采用水热法在泡沫镍(NF)基底上制备出了三维分层花瓣状纳米结构的Ni-Co-S-O复合材料催化剂。当原始溶液中w_(Ni)∶w_(Co)=1∶2时,所制备的Ni-Co-S-O/NF(1∶2)催化剂具有更大的电化学活性面积(ECSA),在碱性水电解析氧过程中具有最好的电催化性能。在1 mol·L^(-1)KOH碱性溶液中,Ni-Co-S-O/NF(1∶2)仅需61和313 mV的过电位,可分别获得10和100 mA·cm^(-2)的电流密度,并且其Tafel斜率为155 mV·dec^(-1)。Ni-Co-S-O/NF(1∶2)催化剂在碱性条件下100 mA·cm^(-2)的恒定高电流密度下运行24 h后仍能保持片状结构,表现出良好的稳定性。

In this paper,the effect of mass ratio of Ni and Co(w_(Ni):w_(Co))in initial solution on the structure and properties of Ni-Co-S-O composite catalysts was studied.A three-dimensional petal-like and hierarchically connected nano-structured Ni-Co-S-O composite catalyst was obtained on a nickel foam(NF)substrate by a hydrothermal method.When w_(Ni):w_(Co)=1:2,the prepared Ni-Co-S-O/NF(1:2)catalyst has a larger electrochemically active area(ECSA)and the best oxygen evolution reaction(OER)catalytic performance in alkaline water electrolysis.In 1 mol·L^(-1)KOH alkaline solution,Ni-Co-S-O/NF(1:2)only need 61 and 313 mV to achieve the current density of 10 and 100 mA·cm^(-2)respectively.At the same time,its Tafel slope was 155 mV·dec^(-1).After tested at a high current density of 100 mA·cm^(-2)for 24 h in the alkaline solution,the Ni-Co-S-O/NF(1:2)could still maintain sheet structure and displayed a good durability.