The oxygen evolution reaction (OER) suffers from low intrinsic activity, poor oxidative stability, and insufficient electrical conductivity, which severely limit the practical deployment of non‑precious metal electrocatalysts. To overcome these obstacles, we designed an MXene@Co(OH)₂ hybrid supported on carbon cloth (MXene@Co(OH)₂/CC) using a straightforward electrodeposition and vacuum drying method. Strong interfacial interactions between MXene and Co(OH)₂ boost charge transfer, create abundant accessible active sites, and reinforce structural integrity under OER working conditions. Consequently, the MXene@Co(OH)₂/CC electrode requires only 261 mV to achieve 10 mA cm^-2 and shows a Tafel slope of 61.7 mV dec^-1, and retains excellent performance for more than 1100 h. Beyond delivering a highly efficient and low‑cost OER catalyst, this work also provides a valuable paradigm for constructing well‑defined heterostructured catalytic systems via interfacial engineering.

The electrochemical CO₂ reduction reaction (CO₂RR) to multi-carbon (C₂₊) products relies predominantly on Cu-based catalysts, but achieving high selectivity and efficiency remains challenging. The formation of C₂₊ products generally involves *CO generation and subsequent dimerization, making the modulation of *CO adsorption behavior critical. Herein, we developed N doped carbon nanosheets supported monatomic Ni and ultrafine oxide-derived Cu in amorphous state as a tandem catalyst. The Ni-N₄ sites enable a high *CO coverage, while the amorphization of the oxide-derived Cu nanoparticles induces a shift in the *CO adsorption configuration from atop to bridging, thereby facilitating the C–C coupling. These integrated effects endow the catalyst with exceptional performance, achieving a record Faradaic efficiency of ~ 70% for C₂₊ products and ~ 54% for C₂H₄. This work provides a strategy for designing tandem catalyst for CO₂RR multiscale component interaction.