Table S1: BET surface area, CO2 physisorption and CH4 productivities of Ta3N5 samples. CH4 dNormalized area/m2 physisorption/mg aSurface bCO2 cCH4 Samples productivity/ g-1 productivity/μmol h-1 h-1 m-2 μmol 5.4 1.68 0.141 0.026 Cuboid 6.6 1.93 0.051 0.008 Nanorod 11.1 1.17 0.022 0.002 Particle surface area and CO2 physisorption were investigated by the a,bThe (BET) method. CH4 yield was determined Ta3N5 samples (0.1 cThe g) within irradiation of 7 hours. from dividing the apparent CH4 dCalculated productivity by BET surface area. Table S2: The N/Ta and O/Ta ratios on the surface and at the 15 nm depth estimated by XPS N/Ta O/Ta O/Ta Samples surface surface 15nm 1.54 0.27 0.04 Cuboid 1.55 0.31 0.05 Nanorod 1.47 0.34 0.19 Particle Fig. S1. XPS spectra of as-synthesized Ta3N5 samples. (a) Ta 4f, (b) N 1s and Ta 4p,
Table S1: BET surface area, CO2 physisorption and CH4 productivities of Ta3N5 samples. Samples aSurface area/m2 g-1 bCO2 physisorption/mg cCH4 productivity/μmol h-1 dNormalized CH4 productivity/ μmol h-1 m-2 Cuboid 5.4 1.68 0.141 0.026 Nanorod 6.6 1.93 0.051 0.008 Particle 11.1 1.17 0.022 0.002 a,bThe surface area and CO2 physisorption were investigated by the (BET) method. cThe CH4 yield was determined Ta3N5 samples (0.1 g) within irradiation of 7 hours. dCalculated from dividing the apparent CH4 productivity by BET surface area. Table S2: The N/Ta and O/Ta ratios on the surface and at the 15 nm depth estimated by XPS Samples N/Ta surface O/Ta surface O/Ta 15nm Cuboid 1.54 0.27 0.04 Nanorod 1.55 0.31 0.05 Particle 1.47 0.34 0.19 Fig. S1. XPS spectra of as-synthesized Ta3N5 samples. (a) Ta 4f, (b) N 1s and Ta 4p,
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