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The slow oxygen evolution reaction (OER) limits water splitting, and external fields can help improve it. However, the effect of a single external field on OER is limited and unsatisfactory. Furthermore, the mechanism by which external fields improve OER is unclear, particularly in the presence of multiple fields. Herein, we propose a strategy for enhancing the OER activity of a catalyst using the combined effect of an optical‐magnetic field and study the mechanism of catalytic activity enhancement. Under the optical‐magnetic field, Co3O4 reduces the resistance by increasing the catalyst temperature. Meanwhile, CoFe2O4 further reduces the resistance via the negative magnetoresistance effect, thus decreasing the resistance from 16 Ω to 7.0 Ω. Additionally, CoFe2O4 acts as a spin polarizer, and electron polarization results in a parallel arrangement of oxygen atoms, which increases the kinetics of the OER under the magnetic field. Benefiting from the optical and magnetic response design, Co3O4/CoFe2O4@Ni foam requires an overpotential of 172.4 mV to reach a current density of 10 mA·cm−2 under an optical‐magnetic field, which is significantly higher than those of recently reported state‐of‐the‐art transition‐metal‐based catalysts.This article is protected by copyright. All rights reserved

River‐dominated marginal seas are important carbon sinks on Earth. However, their carbon sequestration capacities are changing due to increased anthropogenic perturbations. Herein, we employ substantial datasets to study the characteristics of organic carbon (OC) from the East China Sea (ECS) in 2006 and 2018 and reveal the impacts of reservoir construction on the OC deposition in this region. We show that the distribution of sedimentary OC in the ECS is primarily controlled by riverine input and seabed erosion processes. Hydrodynamic processes influence the OC deposition due to both the scouring of fine‐grained sediments and selective degradation of OC associated with the sediment mobilization. The deposition flux of OC in the ECS decreased by 48% after reservoir construction. These findings demonstrate that reservoir construction seriously affected the OC deposition in the ECS and may be applicable to river‐dominated continental shelves worldwide.

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