Copper–Nickel Nitride Nanosheets as Efficient Bifunctional Catalysts for Hydrazine‐Assisted Electrolytic Hydrogen Production
Copper–Nickel Nitride Nanosheets as Efficient Bifunctional Catalysts for Hydrazine‐Assisted Electrolytic Hydrogen Production
复制标题
DOI：
10.1002/aenm.201900390
复制
发表时间：
2019-04
影响因子：
27.8
通讯作者：
Zhaoyang Wang;Lin Xu;Fuzhi Huang;Long Qu;Jiantao Li;K. Owusu;Zi'ang Liu;Zifeng Lin;Binhua Xiang-Bi
中科院分区：
文献类型：
--
作者：
Zhaoyang Wang;Lin Xu;Fuzhi Huang;Long Qu;Jiantao Li;K. Owusu;Zi'ang Liu;Zifeng Lin;Binhua Xiang-Bi
电催化分解水是一种可持续发展的制氢策略，但由于阳极析氧反应缓慢，仍是一个巨大的挑战。降低电解水输入槽电压的一个非常有效的方法是用肼氧化反应(HZOR)代替阳极OER，因为它的热力学氧化电位较低。因此，开发低成本、高效率的HZOR催化剂，结合阴极析氢反应，对节能电解制氢具有重要意义。为此，在碳纤维布上合理地构建了一种具有丰富的Cu4N/Ni3N界面的新型铜镍氮化物(Cu1Ni2-N)。该3D电极在1.0mKOH中10 mA cm−2时的过电位为71.4 mV，同时在1.0mKOH/0.5M联氨电解液中10 mA cm−2时的超低电位为0.5 mV。此外，以合成的Cu1Ni2-N电极为阴极和阳极的电解槽在10 mA cm−2下的槽电压为0.24V，在75h内具有良好的稳定性。本工作通过联氨辅助开发了具有良好前景的铜镍基氮化物双功能电催化剂，用于节能电解制氢。
Electrocatalytic water splitting is one of the sustainable and promising strategies to generate hydrogen fuel but still remains a great challenge because of the sluggish anodic oxygen evolution reaction (OER). A very effective approach to dramatically decrease the input cell voltage of water electrolysis is to replace the anodic OER with hydrazine oxidation reaction (HzOR) due to its lower thermodynamic oxidation potential. Therefore, developing the low‐cost and efficient HzOR catalysts, coupled with the cathodic hydrogen evolution reaction (HER), is tremendously important for energy‐saving electrolytic hydrogen production. Herein, a new‐type of copper–nickel nitride (Cu1Ni2‐N) with rich Cu4N/Ni3N interface is rationally constructed on carbon fiber cloth. The 3D electrode exhibits extraordinary HER performance with an overpotential of 71.4 mV at 10 mA cm−2 in 1.0 m KOH, simultaneously delivering an ultralow potential of 0.5 mV at 10 mA cm−2 for HzOR in a 1.0 m KOH/0.5 m hydrazine electrolyte. Moreover, the electrolytic cell utilizing the synthesized Cu1Ni2‐N electrode as both the cathode and anode display a cell voltage of 0.24 V at 10 mA cm−2 with an excellent stability over 75 h. The present work develops the promising copper–nickel‐based nitride as a bifunctional electrocatalyst through hydrazine‐assistance for energy‐saving electrolytic hydrogen production.