It is addressed that the challenges of poor cyclic stability and low conductivity in metal–organic frameworks (MOFs) hinder their application in energy storage. Here, we synthesized binary metal MOFs through a one-step hydrothermal process, subsequently calcined to produce Co–Mn/reduced graphene oxide (rGO). This approach not only carbonized the organic framework but also enhanced its electrical conductivity and stability. Our findings demonstrated that the synergistic effects of Co and Mn within the assembled electrode resulted in remarkable performance, achieving a specific capacitance of 3558.65 F g− 1 at 1 A g− 1 and a rate capability of 1000 F g− 1 at 30 A g− 1. The Co–Mn/rGO anode in the asymmetric supercapattery exhibited a broadened operating potential window of 1.5 V, delivering an energy density of 54.65 W h kg− 1 at a power density of 125 W kg− 1, and maintaining 11.375 W h kg− 1 at a high power density of 12,500 W kg− 1. Notably, the capacitance retention rate reached 99.99% after 10,000 cycles at a current density of 10 A g− 1. These results suggest that the developed Co–Mn/rGO composite represents a promising candidate for advanced energy storage systems, offering both high performance and stability.

With the development of photocatalytic hydrogen production technology, the effective transport of photogenerated carrier electrons is still one of the main factors affecting the performance of photocatalytic hydrogen evolution. In this work, graphdiyne was prepared by ball milling method. The CoMo-MOF with polyhedral structure was introduced into graphdiyne to construct S-scheme heterojunction to promote the efficient transfer of photogenerated carriers and enhanced hydrogen evolution activity. Graphdiyne is a new carbon material with adjustable band gap, which is synthesized from the hybrid of sp and sp2, and has excellent electrical conductivity. CoMo-MOF is a polyhedral structure that can provide more active sites and promote photocatalytic hydrogen evolution. The weak point of poor conductivity in CoMo-MOF has been successfully improved by combining CoMo-MOF with graphdiyne, and the migration rate of photogenerated carriers has been accelerated. The hydrogen evolution property of graphdiyne/CoMo-MOF is 300 μmol, which is 19.61 times that of graphdiyne and 9.03 times that of CoMo-MOF. Therefore, the construction of S-scheme heterojunction provides a transport channel for electron transfer and improves the efficiency of photogenerated carrier separation. This work provides a new train of thought of design to introduce MOFs materials into carbon materials for photocatalytic hydrogen evolution.

전 세계적인 물 부족을 해결하기 위한 유망한 방법으로 수착제를 이용하여 공기 중에서 물을 수확하는 기술은 수 자원이 부족한 지역에서 식수를 전달할 수 있는 큰 잠재력을 보여주고 있음. 본 총설에서는 대기 중 물을 수확하기 위한 수 착제로 금속유기골격구조(MOF)를 사용하는 최근 연구에 대해 소개함. 제올라이트나 실리카 기반 물질과 같은 다른 수착제 물질에 비해, MOF는 상대습도 10% 부근에서 물 수착 곡선의 변곡점을 보이는 특성 덕분에 건조한 사막지역에서 물을 수확 하기에 적합한 특성을 가지고 있음. 이러한 특성으로 말미암아 최근 MOF를 이용하여 물을 수확할 수 있는 실용적인 물 수확 장치를 개발하기 위한 연구가 활발히 진행되고 있음. 이 기술은 전 세계 어느 곳에서나 지리 환경적 영향을 받지 않고 대기 중의 물에 접근할 수 있기 때문에, 미래 지속가능한 수자원 확보 기술 측면에서 새로운 패러다임을 제시할 것으로 기대됨.

Exploring earth-abundant, highly effective and stable electrocatalysts for electrochemical water splitting is urgent and essential to the development of hydrogen (H2) energy technology. Iron-cobalt layered double hydroxide (FeCo-LDH) has been widely used as an electrocatalystfor OER due to its facile synthesis, tunable components, and low cost. However, LDH synthesized by the traditional hydrothermal method tends to easily agglomerate, resulting in an unstable structure that can change or dissolve in an alkaline solution. Therefore, studying the real active phase is highly significant in the design of electrochemical electrode materials. Here, metal-organic frameworks (MOFs) are used as template precursors to derive FeCo-LDH from different iron sources. Iron salts with different anions have a significant impact on the morphology and charge transfer properties of the resulting materials. FeCo-LDH synthesized from iron sulfate solution (FeCo-LDH-SO4) exhibits a hybrid structure of nanosheets and nanowires, quite different from other electrocatalysts that were synthesized from iron chloride and iron nitrate solutions. The final FeCo-LDH-SO4 had an overpotential of 247 mV with a low Tafel-slope of 60.6 mV dec-1 at a current density of 10 mA cm-2 and delivered a long-term stability of 40 h for the OER. This work provides an innovative and feasible strategy to construct efficient electrocatalysts.