The development of cheap and highly active electrocatalysts for efficient water splitting is crucial for the production of green hydrogen at a low cost. In this work, we proposed a two-step method including hydrothermal and nitridation reactions to in situ synthesize NiMoN nanorod arrays with abundant active sites and a fast electron transfer rate on nickel foam substrate. The optimal tailoring of the Ni/Mo ratio leads to a high concentration of active Mo3+ species and suitable Ni doping content in the NiMoN catalyst, which shows superior hydrogen evolution reaction performance. The overpotentials at the current densities of 10 and 100 mA/cm2 are only 20 and 46 mV, which are better than those of the most reported NiMoN-based catalysts and even the commercial benchmark material of Pt/C. Additionally, the electrocatalyst also shows excellent long-term stability after 24 h tests at densities of 10 and 100 mA/cm2, possessing great potential for industrial applications for water splitting to produce hydrogen.

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The selective catalytic reduction technology that uses CO as a reductant (CO-SCR) has great potential in addressing nitrogen oxides (NO x ) pollution in industry. Herein, we reported the in situ growth of highly efficient CuMnO 2 nanosheet catalysts on low-cost stainless steel mesh (SSM) by a hydrothermal method, which exhibited excellent CO-SCR performance. It has been demonstrated that the prepared CuMnO 2 nanosheet catalysts with high crystallinity and an exposed (001) plane could realize 100% NO conversion and N 2 selectivity at 310 °C, which is comparable to other reported Cu− Mn−O catalysts. Moreover, the reaction mechanism driven by the surface synergetic oxygen vacancy of Cu−□−Mn is also proposed for enhancement of the CO-SCR performance. The good mechanical strength, easy shape processability, and high temperature stability of the inexpensive SSM support, together with the good catalytic performance of the active CuMnO 2 component, could make the CuMnO 2 /SSM monolithic catalyst more favorable for large-scale industry application in de-NO x .