Dual-metal single-atom catalysts (DACs), featuring high atomic utilization efficiency, excellent selectivity, and stability originating from the atomically dispersed nature, have emerged as a new frontier in heterogeneous electrocatalysis due to the synergistic effect between diversified metal active sites in promoting their catalytic activity. In this review, the recent progress and development on the syntheses, characterizations, theoretical uniqueness, and applications for various catalytic reactions and devices (oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, CO 2 reduction reaction, N 2 reduction reaction, proton exchange membrane fuel cells) are summarized and reviewed. Specifically, the synergistic effect between the two metal centers and electronic structures of catalysts is systematically discussed. Moreover, the future challenges and prospects in developing practical DACs are proposed as a possible direction for further investigation.

In the face of the increasingly serious greenhouse effect and climate warming, carbon dioxide reduction (CO2RR) technology, which can produce valuable chemicals and fuels while consuming CO2, has become the focus of technology development. However, in the process of CO2 conversion into high-value products, it is still a challenge for electrocatalytic materials to achieve high efficiency and selectivity while inhibiting the byproducts of the hydrogen evolution reaction. These challenges can be solved by clarifying the factors regulating the catalytic performance of the CO2RR. With this background, we divided copper-bearing catalysts into bulk phase catalyst, copper-bearing compound catalyst, alloy catalyst, and single-atom catalyst and summarized the development status of each system in recent years. In addition, we further discussed the mechanisms affecting the performance of the CO2RR to help design catalysts with more effective selectivity. We hope this Review will inspire and encourage researchers to develop copper-bearing catalysts with better CO2RR performance.

Perovskite/silicon tandem solar cells are promising to penetrate photovoltaic market. However, the wide‐bandgap perovskite absorbers used in top‐cell often suffer severe phase segregation under illumination, which restricts the operation lifetime of tandem solar cells. Here, a strain modulation strategy to fabricate light‐stable perovskite/silicon tandem solar cells is reported. By employing adenosine triphosphate, the residual tensile strain in the wide‐bandgap perovskite absorber is successfully converted to compressive strain, which mitigates light‐induced ion migration and phase segregation. Based on the wide‐bandgap perovskite with compressive strain, single‐junction solar cells with the n–i–p layout yield a power conversion efficiency (PCE) of 20.53% with the smallest voltage deficits of 440 mV. These cells also maintain 83.60% of initial PCE after 2500 h operation at the maximum power point. Finally, these top cells are integrated with silicon bottom cells in a monolithic tandem device, which achieves a PCE of 26.95% and improved light stability at open‐circuit.

Great enthusiasm in single-atom catalysts for various catalytic reactions continues to heat up. However, the poor activity of the existing single/dual-metal-atom catalysts does not meet the actual requirement. In this scenario, the precise design of triple-metal-atom catalysts is vital but still challenging. Here, a triple-atom site catalyst of FeCoZn catalyst coordinated with S and N, which is doped in the carbon matrix (named FeCoZn-TAC/SNC), is designed. The FeCoZn catalyst can mimic the activity of oxidase by activating O 2 into • O 2 − radicals by virtue of its atomically dispersed metal active sites. Employing this characteristic, triple-atom catalysts can become a great driving force for the development of novel biosensors featuring adequate sensitivity. First, the property of FeCoZn catalyst as an oxidase-like nanozyme was explored. The obtained FeCoZn-TAC/SNC shows remarkably enhanced catalytic performance than that of FeCoZn-TAC/NC and single/dual-atom site catalysts (FeZn, CoZn, FeCo-DAC/NC and Fe, Zn, Co-SAC/NC) because of trimetallic sites, demonstrating the synergistic effect. Further, the utility of the oxidase-like FeCoZn-TAC/SNC in biosensor field is evaluated by the colorimetric sensing of ascorbic acid. The nanozyme sensor shows a wide concentration range from 0.01 to 90 μM and an excellent detection limit of 6.24 nM. The applicability of the nanozyme sensor in biologically relevant detection was further proved in serum. The implementation of TAC in colorimetric detection holds vast promise for further development of biomedical research and clinical diagnosis.

Co-based single-atom-catalyst has been discovered as a possible candidate for the oxygen evolution reaction (OER), whereby further improvements in performance with only Co metal sites are still challenging with limited...