泡沫镍负载Co_(9)S_(8)/Ni_(3)S_(2)异质结电催化解耦尿素溶液制氢  

Electrocatalytic decoupling of urea solution for hydrogen production by nickel foam‑supported Co_(9)S_(8)/Ni_(3)S_(2) heterojunction

作　　者：郭浩 韦童 申晴晴 洪安琪 邓泽婷 方政 史吉超 李仁宏[1] GUO Hao;WEI Tong;SHEN Qingqing;HONG Anqi;DENG Zeting;FANG Zheng;SHI Jichao;LI Renhong(School of Materials Science&Engineering,Zhejiang SCI-TECH University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《无机化学学报》2024年第11期2141-2154,共14页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.22172143)资助。

摘　　要：采用一步水热法合成泡沫镍(NF)自支撑的Co_(9)S_(8)/Ni_(3)S_(2)@NF杂化纳米棒阵列,其可以作为尿素氧化反应(UOR)和析氢反应(HER)的双功能催化剂。物相分析、形貌表征和电化学测试结果表明Co_(9)S_(8)/Ni_(3)S_(2)@NF异质结杂化纳米棒阵列通过Co_(9)S_(8)与Ni_(3)S_(2)之间的耦合异质界面促进了电子转移,提高了电荷转移速率。同时,该催化剂的粗糙表面使其展示出优异的超亲水性和超疏气性,有利于气体输送以及电解液扩散。在UOR和HER中,该催化剂分别在120和103 mV的低过电位下就能达到100和10 mA·cm^(-2)的电流密度。此外,利用合成的Co_(9)S_(8)/Ni_(3)S_(2)@NF电极同时作为阴极和阳极,当电流密度达到100 mA·cm^(-2)时双电极电解池的运行仅需要1.57 V的低电压,并且在20 mA·cm^(-2)电流密度下稳定运行27 h,无明显活性衰减。Herein,a one-step hydrothermal method was used to synthesize nickel foam(NF)self-supported Co_(9)S_(8)/Ni_(3)S_(2)@NF heterojunction nanorod arrays,which can be used as bifunctional catalysts for urea oxidation reaction(UOR)and hydrogen precipitation reaction(HER).The results of physical phase analysis,morphological character-ization,and electrochemical tests showed that the Co_(9)S_(8)/Ni_(3)S_(2)@NF heterojunction hybridized nanorod arrays facili-tated the electron transfer through the coupled hetero-interface between Co_(9)S_(8) and Ni_(3)S_(2),and improved the charge transfer rate.Meanwhile,the rough surface of the catalyst enabled it to exhibit excellent superhydrophilicity and superhydrophobicity,which facilitated gas transport as well as electrolyte diffusion.The catalyst was able to achieve current densities of 100 and 10 mA·cm^(-2) at low overpotentials of 120 and 103 mV in UOR and HER,respectively.In addition,using the synthesized Co_(9)S_(8)/Ni_(3)S_(2)@NF electrodes as cathode and anode,the operation of the two-electrode electrolytic cell required only a low voltage of 1.57 V when the current density reached 100 mA·cm^(-2) and operated stably for 27 h at a current density of 20 mA·cm^(-2) without significant activity decay.

关 键 词：镍基硫化物 尿素氧化反应 电解水 双功能催化剂 纳米棒 

分 类 号：TQ426[化学工程] O614.813[理学—无机化学]