Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 44, Pages 30143-30151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09600
Keywords
cobalt boride; nickel boride; silicon; photocathode; hydrogen evolution reaction; photoelectrochemical catalysis
Funding
- National Natural Science Foundation of China [21373040, 21673028, 21120102036, 21361130020]
- Basic Research Program of China [2014CB239402]
- PhD Program Foundation of the Ministry of Education of China [20130041110024]
- Swedish Energy Agency
- Swedish Research Council
- K & A Wallenberg Foundation
Ask authors/readers for more resources
Modification of p-type Si surface by active and stable earth-abundant electrocatalysts is an effective strategy to improve the sluggish kinetics for the hydrogen evolution reaction (HER) at p-Si/electrolyte interface and to develop highly efficient and low-cost photocathodes for hydrogen production from water. To this end, Si nanowire (Si-NW) array has been loaded-with highly efficient electrocatalysts, M-B (M = Ni, Co), by facile and quick electroless plating to build M-B catalyst-modified Si nanowire-array-textured photocathodes for water reduction to H-2. Compared with the bare Si-NW array, composite Si-NWs/M-B arrays display evidently enhanced photoelectrochemical (PEC) performance. The onset potential (V-phon) of cathodic photocurrent is positively shifted by 530-540 mV to 0.44-0.45 V vs RHE, and the short-circuit current density (J(sc)) is up to 19.5 mA cm(-2) in neutral buffer solution under simulated 1 sun illumination. Impressively, the half-cell photopower conversion efficiencies (eta(hc)) of the optimized Si-NWs/Co-B (2.53%) and Si-NWs/Ni-B (2.45%) are comparable to that of Si-NWs/Pt (2.46%). In terms of the large J(sc), V-phon, and eta(hc) values, as well as the high Faradaic efficiency, Si-NW-s/M-B electrodes are among the top performing Si photocathodes which are modified with HER electrocatalysts but have no buried solid/solid junction.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available