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a LgI~V curves of the Pd-decorated MoS2/Si heterojunction. b I vs t graphs of the Pd-decorated MoS2/Si heterojunction exposed to pure H2 at − 1.0 V and RT. c, d Enlarged response and recovery edges, respectively, of the sensing curve. The response time (t res) is the time interval for the response to rise from 10 to 90% of the total current change. The recovery time (t rec) is the time interval for the response to decay from 90 to 10% of the total current change
