An interfacially coupled Cu-cluster/GaN photocathode is designed to overcome the efficiency and stability bottlenecks in photoelectrochemical CO2 reduction to multicarbon products. The self-optimized Ga–N–O interface facilitates and stabilizes interfacially oxidized copper species of copper clusters, which function as efficient C–C coupling sites for ethylene production.
- Bingxing Zhang
- Peng Zhou
- Zetian Mi