Ma Yan, Lu ZiAng, Li Siwei, Wu Jie, Wang Jing, Du Yunchen, Sun Jianmin, Xu Ping
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P.R. China.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):12668-12676. doi: 10.1021/acsami.9b19437. Epub 2020 Mar 6.
Development of highly efficient electrocatalyst for the oxygen evolution reaction (OER) is urgently demanded by the clean hydrogen energy. Herein, in order to further boost the OER activity of metal nitrate hydroxide materials, amorphous Fe(OH) layer is in situ grown on nickel nitrate hydroxide (NiNH) nanoarrays supported on nickel foam (NF) through an interfacial hydrolysis approach, where the loading amount of the Fe(OH) can be simply manipulated by the hydrolysis time. Taking advantage of the synergy of Fe(OH) and NiNH, the optimized Fe(OH)@NiNH/NF sample shows a very promising electrocatalytic OER activity in 1 M KOH solution, requiring a very low overpotential of 212 mV vs. reversible hydrogen electrode (RHE) to deliver a geometrical catalytic current density of 100 mA cm and a low Tafel slope of 49 mV dec. This work provides a new strategy for boosting the electrocatalytic activity of metal hydroxide nitrates through the interface engineering.
清洁氢能迫切需要开发用于析氧反应（OER）的高效电催化剂。在此，为了进一步提高金属硝酸氢氧化物材料的OER活性，通过界面水解方法在泡沫镍（NF）负载的硝酸镍氢氧化物（NiNH）纳米阵列上原位生长非晶态Fe(OH)层，其中Fe(OH)的负载量可通过水解时间简单控制。利用Fe(OH)和NiNH的协同作用，优化后的Fe(OH)@NiNH/NF样品在1 M KOH溶液中表现出非常有前景的电催化OER活性，相对于可逆氢电极（RHE），仅需212 mV的超低过电位即可提供100 mA cm的几何催化电流密度，且塔菲尔斜率低至49 mV dec。这项工作通过界面工程为提高金属硝酸氢氧化物的电催化活性提供了一种新策略。
