Xuesong Liu,Kuan Deng,Peng Liu,Xingbin Lv,Wen Tian,Kui Ma,Hongjiao Li,Junyi Ji
Construction of durable multi-function electrocatalysts for hydrogen production is still highly challenging. Herein, we report a hierarchical integrated tri-functional heterogeneous CNTs/MoC/CoNiMo electrode for HER and related OER/UOR. The carbon-protected Ni nanoparticles yield abundant γ-NiOOH active intermediates to boost OER/UOR, while DFT calculations verify Mo migration induced by MoC and CoNiMo alloy under negative potentials generates HER super-active sites on Mo-rich surfaces. Additionally, the parallel aligned nanosheets with out-plane extended CNTs arrays can guide the rapid bubbles release and expand the accessible surface area. Therefore, the optimized CNT/MoC/NMC-3 electrode can achieve overpotentials of 51 mV (HER) and 226 mV (OER), with low potential threshold of 1.257 V (UOR) at 10 mA cm –2 . Moreover, the assembled symmetric urea electrolyzer reaches a 1.291 V cell voltage at 10 mA cm –2 . This work provides a novel strategy for heterostructure multi-component integration for achieving high-efficiency hydrogen production and urea-containing wastewater purification.
Graphical Metal–organic assemblies for electrodes : A new metal–organic coordination strategy tuned by a surfactant is presented for the design of Mo-based hybrid materials ranging from 2D nanopetals to 3D microflowers. The new lithium-ion battery (LIB) of Ni-MoO 2 /N-C|LiNi 0.6 Co 0.2 Mn 0.2 O 2 with high rate features above 8 C is introduced. This strategy is applicable for greater capabilities, and the high-rate LIB can meet the requirements of fast-charging energy storage devices. Multi-dimensional metal oxides have attracted great attention in diverse applications due to their intriguing performances. However, their structural design remains challenging, particularly that based on organic chelation chemistry. Although metal–organic complexes with different architectures have been reported, their structure formation mechanisms are not well understood because of the complex chelation processes. Herein, we introduce a new metal–organic coordination strategy to construct metal-decorated (Ni, Co, Mn) Mo-based complexes ranging from 2D nanopetals to 3D microflowers. The chelating process of the metal–organic complex can be tuned by a surfactant, giving rise to different structures, and then a further metal can be appended. Thus, different metal (oxide)-decorated MoO 2 /C-N structures were designed, enabling an extremely high lithium storage capability of 1018 mA h g −1 and rate capacities of up to 10 A g −1 over 1000 cycles. Relationships between electrochemical behavior and structure have been analyzed kinetically. A high-rate lithium-ion battery has been assembled from Ni-MoO 2 /C-N and an Ni-rich layered oxide as the anode and cathode, respectively. We believe that this general metal–organic coordination strategy should be applicable to other multi-functional materials with superior capabilities.
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