Benchmark performance of low-cost Sb2Se3 photocathodes for unassisted solar overall water splitting
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- Benchmark performance of low-cost Sb2Se3 photocathodes for unassisted solar overall water splitting
- Yang, Wooseok; Kim, Jin Hyun; Hutter, Oliver S.; Phillips, Laurie J.; Tan, Jeiwan; Park, Jaemin; Lee, Hyungsoo; Major, Jonathan D.; Lee, Jae Sung; Moon, Jooho
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE COMMUNICATIONS, v.11, no.1, pp.861
- Determining cost-effective semiconductors exhibiting desirable properties for commercial photoelectrochemical water splitting remains a challenge. Herein, we report a Sb2Se3 semiconductor that satisfies most requirements for an ideal high-performance photoelectrode, including a small band gap and favourable cost, optoelectronic properties, processability, and photocorrosion stability. Strong anisotropy, a major issue for Sb2Se3, is resolved by suppressing growth kinetics via close space sublimation to obtain high-quality compact thin films with favourable crystallographic orientation. The Sb2Se3 photocathode exhibits a high photocurrent density of almost 30mAcm(-2) at 0V against the reversible hydrogen electrode, the highest value so far. We demonstrate unassisted solar overall water splitting by combining the optimised Sb2Se3 photocathode with a BiVO4 photoanode, achieving a solar-to-hydrogen efficiency of 1.5% with stability over 10h under simulated 1 sun conditions employing a broad range of solar fluxes. Low-cost Sb2Se3 can thus be an attractive breakthrough material for commercial solar fuel production. While photoelectrochemical water splitting offers an integrated means to convert sunlight to a renewable fuel, cost-effective light-absorbers are rare. Here, authors report Sb2Se3 photocathodes for high-performance photoelectrochemical water splitting devices.
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