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Nowadays, the main resources of energy used by our society are still fossil energies, such as oil, natural gas and coal. However, due to the limited resources of these fossil fuels and the increased energy demand, we have realized that it is time to develop and utilize the sustainable and renewable energies. Compared with the bioenergy, wind and water energies being used by our society, the solar energy is much more powerful and abundant. Converting solar energy to electricity using solar cells and converting solar energy to fuels (CO, formate, etc.) using solar fuel devices are two strategies to utilize the sun light.